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!91 [sync] PR-88: Fix CVE-2022-23521 CVE-2022-41903

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From: @openeuler-sync-bot 
Reviewed-by: @overweight 
Signed-off-by: @overweight
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openeuler-ci-bot 2023-01-28 08:16:34 +00:00 committed by Gitee
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23 changed files with 2287 additions and 1 deletions
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From 24557209500e6ed618f04a8795a111a0c491a29c Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:45:23 +0100
Subject: [PATCH] attr: fix integer overflow when parsing huge attribute names
It is possible to trigger an integer overflow when parsing attribute
names that are longer than 2^31 bytes because we assign the result of
strlen(3P) to an `int` instead of to a `size_t`. This can lead to an
abort in vsnprintf(3P) with the following reproducer:
blob=$(perl -e 'print "A " . "B"x2147483648 . "\n"' | git hash-object -w --stdin)
git update-index --add --cacheinfo 100644,$blob,.gitattributes
git check-attr --all path
BUG: strbuf.c:400: your vsnprintf is broken (returned -1)
But furthermore, assuming that the attribute name is even longer than
that, it can cause us to silently truncate the attribute and thus lead
to wrong results.
Fix this integer overflow by using a `size_t` instead. This fixes the
silent truncation of attribute names, but it only partially fixes the
BUG we hit: even though the initial BUG is fixed, we can still hit a BUG
when parsing invalid attribute lines via `report_invalid_attr()`.
This is due to an underlying design issue in vsnprintf(3P) which only
knows to return an `int`, and thus it may always overflow with large
inputs. This issue is benign though: the worst that can happen is that
the error message is misreported to be either truncated or too long, but
due to the buffer being NUL terminated we wouldn't ever do an
out-of-bounds read here.
Reported-by: Markus Vervier <markus.vervier@x41-dsec.de>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
attr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/attr.c b/attr.c
index 9d42bc1721..4a10ba4d94 100644
--- a/attr.c
+++ b/attr.c
@@ -289,7 +289,7 @@ static const char *parse_attr(const char *src, int lineno, const char *cp,
struct attr_state *e)
{
const char *ep, *equals;
- int len;
+ size_t len;
ep = cp + strcspn(cp, blank);
equals = strchr(cp, '=');
--
2.27.0

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From e1e12e97ac73ded85f7d000da1063a774b3cc14f Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:45:36 +0100
Subject: [PATCH] attr: fix integer overflow with more than INT_MAX macros
Attributes have a field that tracks the position in the `all_attrs`
array they're stored inside. This field gets set via `hashmap_get_size`
when adding the attribute to the global map of attributes. But while the
field is of type `int`, the value returned by `hashmap_get_size` is an
`unsigned int`. It can thus happen that the value overflows, where we
would now dereference teh `all_attrs` array at an out-of-bounds value.
We do have a sanity check for this overflow via an assert that verifies
the index matches the new hashmap's size. But asserts are not a proper
mechanism to detect against any such overflows as they may not in fact
be compiled into production code.
Fix this by using an `unsigned int` to track the index and convert the
assert to a call `die()`.
Reported-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
attr.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/attr.c b/attr.c
index 98c231d675..d1faf69083 100644
--- a/attr.c
+++ b/attr.c
@@ -28,7 +28,7 @@ static const char git_attr__unknown[] = "(builtin)unknown";
#endif
struct git_attr {
- int attr_nr; /* unique attribute number */
+ unsigned int attr_nr; /* unique attribute number */
char name[FLEX_ARRAY]; /* attribute name */
};
@@ -226,8 +226,8 @@ static const struct git_attr *git_attr_internal(const char *name, size_t namelen
a->attr_nr = hashmap_get_size(&g_attr_hashmap.map);
attr_hashmap_add(&g_attr_hashmap, a->name, namelen, a);
- assert(a->attr_nr ==
- (hashmap_get_size(&g_attr_hashmap.map) - 1));
+ if (a->attr_nr != hashmap_get_size(&g_attr_hashmap.map) - 1)
+ die(_("unable to add additional attribute"));
}
hashmap_unlock(&g_attr_hashmap);
@@ -1064,7 +1064,7 @@ static void determine_macros(struct all_attrs_item *all_attrs,
for (i = stack->num_matches; i > 0; i--) {
const struct match_attr *ma = stack->attrs[i - 1];
if (ma->is_macro) {
- int n = ma->u.attr->attr_nr;
+ unsigned int n = ma->u.attr->attr_nr;
if (!all_attrs[n].macro) {
all_attrs[n].macro = ma;
}
@@ -1116,7 +1116,7 @@ void git_check_attr(const struct index_state *istate,
collect_some_attrs(istate, path, check);
for (i = 0; i < check->nr; i++) {
- size_t n = check->items[i].attr->attr_nr;
+ unsigned int n = check->items[i].attr->attr_nr;
const char *value = check->all_attrs[n].value;
if (value == ATTR__UNKNOWN)
value = ATTR__UNSET;
--
2.27.0

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From 8d0d48cf2157cfb914db1f53b3fe40785b86f3aa Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:45:19 +0100
Subject: [PATCH] attr: fix out-of-bounds read with huge attribute names
There is an out-of-bounds read possible when parsing gitattributes that
have an attribute that is 2^31+1 bytes long. This is caused due to an
integer overflow when we assign the result of strlen(3P) to an `int`,
where we use the wrapped-around value in a subsequent call to
memcpy(3P). The following code reproduces the issue:
blob=$(perl -e 'print "a" x 2147483649 . " attr"' | git hash-object -w --stdin)
git update-index --add --cacheinfo 100644,$blob,.gitattributes
git check-attr --all file
AddressSanitizer:DEADLYSIGNAL
=================================================================
==8451==ERROR: AddressSanitizer: SEGV on unknown address 0x7f93efa00800 (pc 0x7f94f1f8f082 bp 0x7ffddb59b3a0 sp 0x7ffddb59ab28 T0)
==8451==The signal is caused by a READ memory access.
#0 0x7f94f1f8f082 (/usr/lib/libc.so.6+0x176082)
#1 0x7f94f2047d9c in __interceptor_strspn /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:752
#2 0x560e190f7f26 in parse_attr_line attr.c:375
#3 0x560e190f9663 in handle_attr_line attr.c:660
#4 0x560e190f9ddd in read_attr_from_index attr.c:769
#5 0x560e190f9f14 in read_attr attr.c:797
#6 0x560e190fa24e in bootstrap_attr_stack attr.c:867
#7 0x560e190fa4a5 in prepare_attr_stack attr.c:902
#8 0x560e190fb5dc in collect_some_attrs attr.c:1097
#9 0x560e190fb93f in git_all_attrs attr.c:1128
#10 0x560e18e6136e in check_attr builtin/check-attr.c:67
#11 0x560e18e61c12 in cmd_check_attr builtin/check-attr.c:183
#12 0x560e18e15993 in run_builtin git.c:466
#13 0x560e18e16397 in handle_builtin git.c:721
#14 0x560e18e16b2b in run_argv git.c:788
#15 0x560e18e17991 in cmd_main git.c:926
#16 0x560e190ae2bd in main common-main.c:57
#17 0x7f94f1e3c28f (/usr/lib/libc.so.6+0x2328f)
#18 0x7f94f1e3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
#19 0x560e18e110e4 in _start ../sysdeps/x86_64/start.S:115
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/usr/lib/libc.so.6+0x176082)
==8451==ABORTING
Fix this bug by converting the variable to a `size_t` instead.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
attr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/attr.c b/attr.c
index 39ce0eb95e..9d42bc1721 100644
--- a/attr.c
+++ b/attr.c
@@ -333,7 +333,7 @@ static const char *parse_attr(const char *src, int lineno, const char *cp,
static struct match_attr *parse_attr_line(const char *line, const char *src,
int lineno, unsigned flags)
{
- int namelen;
+ size_t namelen;
int num_attr, i;
const char *cp, *name, *states;
struct match_attr *res = NULL;
--
2.27.0

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From 447ac906e189535e77dcb1f4bbe3f1bc917d4c12 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:45:31 +0100
Subject: [PATCH] attr: fix out-of-bounds read with unreasonable amount of
patterns
The `struct attr_stack` tracks the stack of all patterns together with
their attributes. When parsing a gitattributes file that has more than
2^31 such patterns though we may trigger multiple out-of-bounds reads on
64 bit platforms. This is because while the `num_matches` variable is an
unsigned integer, we always use a signed integer to iterate over them.
I have not been able to reproduce this issue due to memory constraints
on my systems. But despite the out-of-bounds reads, the worst thing that
can seemingly happen is to call free(3P) with a garbage pointer when
calling `attr_stack_free()`.
Fix this bug by using unsigned integers to iterate over the array. While
this makes the iteration somewhat awkward when iterating in reverse, it
is at least better than knowingly running into an out-of-bounds read.
While at it, convert the call to `ALLOC_GROW` to use `ALLOC_GROW_BY`
instead.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
attr.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/attr.c b/attr.c
index 525f6da201..98c231d675 100644
--- a/attr.c
+++ b/attr.c
@@ -446,7 +446,7 @@ struct attr_stack {
static void attr_stack_free(struct attr_stack *e)
{
- int i;
+ unsigned i;
free(e->origin);
for (i = 0; i < e->num_matches; i++) {
struct match_attr *a = e->attrs[i];
@@ -660,8 +660,8 @@ static void handle_attr_line(struct attr_stack *res,
a = parse_attr_line(line, src, lineno, flags);
if (!a)
return;
- ALLOC_GROW(res->attrs, res->num_matches + 1, res->alloc);
- res->attrs[res->num_matches++] = a;
+ ALLOC_GROW_BY(res->attrs, res->num_matches, 1, res->alloc);
+ res->attrs[res->num_matches - 1] = a;
}
static struct attr_stack *read_attr_from_array(const char **list)
@@ -1025,11 +1025,11 @@ static int fill(const char *path, int pathlen, int basename_offset,
struct all_attrs_item *all_attrs, int rem)
{
for (; rem > 0 && stack; stack = stack->prev) {
- int i;
+ unsigned i;
const char *base = stack->origin ? stack->origin : "";
- for (i = stack->num_matches - 1; 0 < rem && 0 <= i; i--) {
- const struct match_attr *a = stack->attrs[i];
+ for (i = stack->num_matches; 0 < rem && 0 < i; i--) {
+ const struct match_attr *a = stack->attrs[i - 1];
if (a->is_macro)
continue;
if (path_matches(path, pathlen, basename_offset,
@@ -1060,9 +1060,9 @@ static void determine_macros(struct all_attrs_item *all_attrs,
const struct attr_stack *stack)
{
for (; stack; stack = stack->prev) {
- int i;
- for (i = stack->num_matches - 1; i >= 0; i--) {
- const struct match_attr *ma = stack->attrs[i];
+ unsigned i;
+ for (i = stack->num_matches; i > 0; i--) {
+ const struct match_attr *ma = stack->attrs[i - 1];
if (ma->is_macro) {
int n = ma->u.attr->attr_nr;
if (!all_attrs[n].macro) {
--
2.27.0

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From 34ace8bad02bb14ecc5b631f7e3daaa7a9bba7d9 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:45:27 +0100
Subject: [PATCH] attr: fix out-of-bounds write when parsing huge number of
attributes
It is possible to trigger an integer overflow when parsing attribute
names when there are more than 2^31 of them for a single pattern. This
can either lead to us dying due to trying to request too many bytes:
blob=$(perl -e 'print "f" . " a=" x 2147483649' | git hash-object -w --stdin)
git update-index --add --cacheinfo 100644,$blob,.gitattributes
git attr-check --all file
=================================================================
==1022==ERROR: AddressSanitizer: requested allocation size 0xfffffff800000032 (0xfffffff800001038 after adjustments for alignment, red zones etc.) exceeds maximum supported size of 0x10000000000 (thread T0)
#0 0x7fd3efabf411 in __interceptor_calloc /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:77
#1 0x5563a0a1e3d3 in xcalloc wrapper.c:150
#2 0x5563a058d005 in parse_attr_line attr.c:384
#3 0x5563a058e661 in handle_attr_line attr.c:660
#4 0x5563a058eddb in read_attr_from_index attr.c:769
#5 0x5563a058ef12 in read_attr attr.c:797
#6 0x5563a058f24c in bootstrap_attr_stack attr.c:867
#7 0x5563a058f4a3 in prepare_attr_stack attr.c:902
#8 0x5563a05905da in collect_some_attrs attr.c:1097
#9 0x5563a059093d in git_all_attrs attr.c:1128
#10 0x5563a02f636e in check_attr builtin/check-attr.c:67
#11 0x5563a02f6c12 in cmd_check_attr builtin/check-attr.c:183
#12 0x5563a02aa993 in run_builtin git.c:466
#13 0x5563a02ab397 in handle_builtin git.c:721
#14 0x5563a02abb2b in run_argv git.c:788
#15 0x5563a02ac991 in cmd_main git.c:926
#16 0x5563a05432bd in main common-main.c:57
#17 0x7fd3ef82228f (/usr/lib/libc.so.6+0x2328f)
==1022==HINT: if you don't care about these errors you may set allocator_may_return_null=1
SUMMARY: AddressSanitizer: allocation-size-too-big /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:77 in __interceptor_calloc
==1022==ABORTING
Or, much worse, it can lead to an out-of-bounds write because we
underallocate and then memcpy(3P) into an array:
perl -e '
print "A " . "\rh="x2000000000;
print "\rh="x2000000000;
print "\rh="x294967294 . "\n"
' >.gitattributes
git add .gitattributes
git commit -am "evil attributes"
$ git clone --quiet /path/to/repo
=================================================================
==15062==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000002550 at pc 0x5555559884d5 bp 0x7fffffffbc60 sp 0x7fffffffbc58
WRITE of size 8 at 0x602000002550 thread T0
#0 0x5555559884d4 in parse_attr_line attr.c:393
#1 0x5555559884d4 in handle_attr_line attr.c:660
#2 0x555555988902 in read_attr_from_index attr.c:784
#3 0x555555988902 in read_attr_from_index attr.c:747
#4 0x555555988a1d in read_attr attr.c:800
#5 0x555555989b0c in bootstrap_attr_stack attr.c:882
#6 0x555555989b0c in prepare_attr_stack attr.c:917
#7 0x555555989b0c in collect_some_attrs attr.c:1112
#8 0x55555598b141 in git_check_attr attr.c:1126
#9 0x555555a13004 in convert_attrs convert.c:1311
#10 0x555555a95e04 in checkout_entry_ca entry.c:553
#11 0x555555d58bf6 in checkout_entry entry.h:42
#12 0x555555d58bf6 in check_updates unpack-trees.c:480
#13 0x555555d5eb55 in unpack_trees unpack-trees.c:2040
#14 0x555555785ab7 in checkout builtin/clone.c:724
#15 0x555555785ab7 in cmd_clone builtin/clone.c:1384
#16 0x55555572443c in run_builtin git.c:466
#17 0x55555572443c in handle_builtin git.c:721
#18 0x555555727872 in run_argv git.c:788
#19 0x555555727872 in cmd_main git.c:926
#20 0x555555721fa0 in main common-main.c:57
#21 0x7ffff73f1d09 in __libc_start_main ../csu/libc-start.c:308
#22 0x555555723f39 in _start (git+0x1cff39)
0x602000002552 is located 0 bytes to the right of 2-byte region [0x602000002550,0x602000002552) allocated by thread T0 here:
#0 0x7ffff768c037 in __interceptor_calloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:154
#1 0x555555d7fff7 in xcalloc wrapper.c:150
#2 0x55555598815f in parse_attr_line attr.c:384
#3 0x55555598815f in handle_attr_line attr.c:660
#4 0x555555988902 in read_attr_from_index attr.c:784
#5 0x555555988902 in read_attr_from_index attr.c:747
#6 0x555555988a1d in read_attr attr.c:800
#7 0x555555989b0c in bootstrap_attr_stack attr.c:882
#8 0x555555989b0c in prepare_attr_stack attr.c:917
#9 0x555555989b0c in collect_some_attrs attr.c:1112
#10 0x55555598b141 in git_check_attr attr.c:1126
#11 0x555555a13004 in convert_attrs convert.c:1311
#12 0x555555a95e04 in checkout_entry_ca entry.c:553
#13 0x555555d58bf6 in checkout_entry entry.h:42
#14 0x555555d58bf6 in check_updates unpack-trees.c:480
#15 0x555555d5eb55 in unpack_trees unpack-trees.c:2040
#16 0x555555785ab7 in checkout builtin/clone.c:724
#17 0x555555785ab7 in cmd_clone builtin/clone.c:1384
#18 0x55555572443c in run_builtin git.c:466
#19 0x55555572443c in handle_builtin git.c:721
#20 0x555555727872 in run_argv git.c:788
#21 0x555555727872 in cmd_main git.c:926
#22 0x555555721fa0 in main common-main.c:57
#23 0x7ffff73f1d09 in __libc_start_main ../csu/libc-start.c:308
SUMMARY: AddressSanitizer: heap-buffer-overflow attr.c:393 in parse_attr_line
Shadow bytes around the buggy address:
0x0c047fff8450: fa fa 00 02 fa fa 00 07 fa fa fd fd fa fa 00 00
0x0c047fff8460: fa fa 02 fa fa fa fd fd fa fa 00 06 fa fa 05 fa
0x0c047fff8470: fa fa fd fd fa fa 00 02 fa fa 06 fa fa fa 05 fa
0x0c047fff8480: fa fa 07 fa fa fa fd fd fa fa 00 01 fa fa 00 02
0x0c047fff8490: fa fa 00 03 fa fa 00 fa fa fa 00 01 fa fa 00 03
=>0x0c047fff84a0: fa fa 00 01 fa fa 00 02 fa fa[02]fa fa fa fa fa
0x0c047fff84b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff84c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff84d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff84e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff84f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc
==15062==ABORTING
Fix this bug by using `size_t` instead to count the number of attributes
so that this value cannot reasonably overflow without running out of
memory before already.
Reported-by: Markus Vervier <markus.vervier@x41-dsec.de>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
attr.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/attr.c b/attr.c
index 4a10ba4d94..525f6da201 100644
--- a/attr.c
+++ b/attr.c
@@ -272,7 +272,7 @@ struct match_attr {
const struct git_attr *attr;
} u;
char is_macro;
- unsigned num_attr;
+ size_t num_attr;
struct attr_state state[FLEX_ARRAY];
};
@@ -333,8 +333,7 @@ static const char *parse_attr(const char *src, int lineno, const char *cp,
static struct match_attr *parse_attr_line(const char *line, const char *src,
int lineno, unsigned flags)
{
- size_t namelen;
- int num_attr, i;
+ size_t namelen, num_attr, i;
const char *cp, *name, *states;
struct match_attr *res = NULL;
int is_macro;
@@ -451,7 +450,8 @@ static void attr_stack_free(struct attr_stack *e)
free(e->origin);
for (i = 0; i < e->num_matches; i++) {
struct match_attr *a = e->attrs[i];
- int j;
+ size_t j;
+
for (j = 0; j < a->num_attr; j++) {
const char *setto = a->state[j].setto;
if (setto == ATTR__TRUE ||
@@ -1001,12 +1001,12 @@ static int macroexpand_one(struct all_attrs_item *all_attrs, int nr, int rem);
static int fill_one(const char *what, struct all_attrs_item *all_attrs,
const struct match_attr *a, int rem)
{
- int i;
+ size_t i;
- for (i = a->num_attr - 1; rem > 0 && i >= 0; i--) {
- const struct git_attr *attr = a->state[i].attr;
+ for (i = a->num_attr; rem > 0 && i > 0; i--) {
+ const struct git_attr *attr = a->state[i - 1].attr;
const char **n = &(all_attrs[attr->attr_nr].value);
- const char *v = a->state[i].setto;
+ const char *v = a->state[i - 1].setto;
if (*n == ATTR__UNKNOWN) {
debug_set(what,
--
2.27.0

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From eb22e7dfa23da6bd9aed9bd1dad69e1e8e167d24 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:45:15 +0100
Subject: [PATCH] attr: fix overflow when upserting attribute with overly long
name
The function `git_attr_internal()` is called to upsert attributes into
the global map. And while all callers pass a `size_t`, the function
itself accepts an `int` as the attribute name's length. This can lead to
an integer overflow in case the attribute name is longer than `INT_MAX`.
Now this overflow seems harmless as the first thing we do is to call
`attr_name_valid()`, and that function only succeeds in case all chars
in the range of `namelen` match a certain small set of chars. We thus
can't do an out-of-bounds read as NUL is not part of that set and all
strings passed to this function are NUL-terminated. And furthermore, we
wouldn't ever read past the current attribute name anyway due to the
same reason. And if validation fails we will return early.
On the other hand it feels fragile to rely on this behaviour, even more
so given that we pass `namelen` to `FLEX_ALLOC_MEM()`. So let's instead
just do the correct thing here and accept a `size_t` as line length.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
attr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/attr.c b/attr.c
index 4ef85d668b..39ce0eb95e 100644
--- a/attr.c
+++ b/attr.c
@@ -210,7 +210,7 @@ static void report_invalid_attr(const char *name, size_t len,
* dictionary. If no entry is found, create a new attribute and store it in
* the dictionary.
*/
-static const struct git_attr *git_attr_internal(const char *name, int namelen)
+static const struct git_attr *git_attr_internal(const char *name, size_t namelen)
{
struct git_attr *a;
--
2.27.0

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@ -0,0 +1,94 @@
From d74b1fd54fdbc45966d12ea907dece11e072fb2b Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:45:44 +0100
Subject: [PATCH] attr: fix silently splitting up lines longer than 2048 bytes
When reading attributes from a file we use fgets(3P) with a buffer size
of 2048 bytes. This means that as soon as a line exceeds the buffer size
we split it up into multiple parts and parse each of them as a separate
pattern line. This is of course not what the user intended, and even
worse the behaviour is inconsistent with how we read attributes from the
index.
Fix this bug by converting the code to use `strbuf_getline()` instead.
This will indeed read in the whole line, which may theoretically lead to
an out-of-memory situation when the gitattributes file is huge. We're
about to reject any gitattributes files larger than 100MB in the next
commit though, which makes this less of a concern.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
attr.c | 13 +++++++------
t/t0003-attributes.sh | 21 +++++++++++++++++++++
2 files changed, 28 insertions(+), 6 deletions(-)
diff --git a/attr.c b/attr.c
index a9f7063cfc..41657479ff 100644
--- a/attr.c
+++ b/attr.c
@@ -704,10 +704,10 @@ void git_attr_set_direction(enum git_attr_direction new_direction)
static struct attr_stack *read_attr_from_file(const char *path, unsigned flags)
{
+ struct strbuf buf = STRBUF_INIT;
int fd;
FILE *fp;
struct attr_stack *res;
- char buf[2048];
int lineno = 0;
if (flags & READ_ATTR_NOFOLLOW)
@@ -722,13 +722,14 @@ static struct attr_stack *read_attr_from_file(const char *path, unsigned flags)
fp = xfdopen(fd, "r");
CALLOC_ARRAY(res, 1);
- while (fgets(buf, sizeof(buf), fp)) {
- char *bufp = buf;
- if (!lineno)
- skip_utf8_bom(&bufp, strlen(bufp));
- handle_attr_line(res, bufp, path, ++lineno, flags);
+ while (strbuf_getline(&buf, fp) != EOF) {
+ if (!lineno && starts_with(buf.buf, utf8_bom))
+ strbuf_remove(&buf, 0, strlen(utf8_bom));
+ handle_attr_line(res, buf.buf, path, ++lineno, macro_ok);
}
+
fclose(fp);
+ strbuf_release(&buf);
return res;
}
diff --git a/t/t0003-attributes.sh b/t/t0003-attributes.sh
index b660593c20..416386ce2f 100755
--- a/t/t0003-attributes.sh
+++ b/t/t0003-attributes.sh
@@ -339,4 +339,25 @@ test_expect_success SYMLINKS 'symlinks n
test_i18ngrep "unable to access.*gitattributes" err
'
+test_expect_success 'large attributes line ignores trailing content in tree' '
+ test_when_finished "rm .gitattributes" &&
+ # older versions of Git broke lines at 2048 bytes; the 2045 bytes
+ # of 0-padding here is accounting for the three bytes of "a 1", which
+ # would knock "trailing" to the "next" line, where it would be
+ # erroneously parsed.
+ printf "a %02045dtrailing attribute\n" 1 >.gitattributes &&
+ git check-attr --all trailing >actual 2>err &&
+ test_must_be_empty err &&
+ test_must_be_empty actual
+'
+
+test_expect_success 'large attributes line ignores trailing content in index' '
+ test_when_finished "git update-index --remove .gitattributes" &&
+ blob=$(printf "a %02045dtrailing attribute\n" 1 | git hash-object -w --stdin) &&
+ git update-index --add --cacheinfo 100644,$blob,.gitattributes &&
+ git check-attr --cached --all trailing >actual 2>err &&
+ test_must_be_empty err &&
+ test_must_be_empty actual
+'
+
test_done
--
2.27.0

40
backport-CVE-2022-23521-attr-harden-allocation-against-integer-overflows.patch Normal file
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@ -0,0 +1,40 @@
From a60a66e409c265b2944f18bf43581c146812586d Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:45:40 +0100
Subject: [PATCH] attr: harden allocation against integer overflows
When parsing an attributes line, we need to allocate an array that holds
all attributes specified for the given file pattern. The calculation to
determine the number of bytes that need to be allocated was prone to an
overflow though when there was an unreasonable amount of attributes.
Harden the allocation by instead using the `st_` helper functions that
cause us to die when we hit an integer overflow.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
attr.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/attr.c b/attr.c
index d1faf69083..a9f7063cfc 100644
--- a/attr.c
+++ b/attr.c
@@ -380,10 +380,9 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
goto fail_return;
}
- res = xcalloc(1,
- sizeof(*res) +
- sizeof(struct attr_state) * num_attr +
- (is_macro ? 0 : namelen + 1));
+ res = xcalloc(1, st_add3(sizeof(*res),
+ st_mult(sizeof(struct attr_state), num_attr),
+ is_macro ? 0 : namelen + 1));
if (is_macro) {
res->u.attr = git_attr_internal(name, namelen);
} else {
--
2.27.0

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@ -0,0 +1,120 @@
From dfa6b32b5e599d97448337ed4fc18dd50c90758f Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:45:48 +0100
Subject: [PATCH] attr: ignore attribute lines exceeding 2048 bytes
There are two different code paths to read gitattributes: once via a
file, and once via the index. These two paths used to behave differently
because when reading attributes from a file, we used fgets(3P) with a
buffer size of 2kB. Consequentially, we silently truncate line lengths
when lines are longer than that and will then parse the remainder of the
line as a new pattern. It goes without saying that this is entirely
unexpected, but it's even worse that the behaviour depends on how the
gitattributes are parsed.
While this is simply wrong, the silent truncation saves us with the
recently discovered vulnerabilities that can cause out-of-bound writes
or reads with unreasonably long lines due to integer overflows. As the
common path is to read gitattributes via the worktree file instead of
via the index, we can assume that any gitattributes file that had lines
longer than that is already broken anyway. So instead of lifting the
limit here, we can double down on it to fix the vulnerabilities.
Introduce an explicit line length limit of 2kB that is shared across all
paths that read attributes and ignore any line that hits this limit
while printing a warning.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
attr.c | 5 +++++
attr.h | 6 ++++++
t/t0003-attributes.sh | 25 +++++++++++++++++++++++--
3 files changed, 34 insertions(+), 2 deletions(-)
diff --git a/attr.c b/attr.c
index 41657479ff..38ecd2fff3 100644
--- a/attr.c
+++ b/attr.c
@@ -344,6 +344,11 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
return NULL;
name = cp;
+ if (strlen(line) >= ATTR_MAX_LINE_LENGTH) {
+ warning(_("ignoring overly long attributes line %d"), lineno);
+ return NULL;
+ }
+
if (*cp == '"' && !unquote_c_style(&pattern, name, &states)) {
name = pattern.buf;
namelen = pattern.len;
diff --git a/attr.h b/attr.h
index 404548f028..df9a75da55 100644
--- a/attr.h
+++ b/attr.h
@@ -107,6 +107,12 @@
* - Free the `attr_check` struct by calling `attr_check_free()`.
*/
+/**
+ * The maximum line length for a gitattributes file. If the line exceeds this
+ * length we will ignore it.
+ */
+#define ATTR_MAX_LINE_LENGTH 2048
+
struct index_state;
/**
diff --git a/t/t0003-attributes.sh b/t/t0003-attributes.sh
index 416386ce2f..7d68e6a56e 100755
--- a/t/t0003-attributes.sh
+++ b/t/t0003-attributes.sh
@@ -339,6 +339,15 @@ test_expect_success 'query binary macro directly' '
test_i18ngrep "unable to access.*gitattributes" err
'
+test_expect_success 'large attributes line ignored in tree' '
+ test_when_finished "rm .gitattributes" &&
+ printf "path %02043d" 1 >.gitattributes &&
+ git check-attr --all path >actual 2>err &&
+ echo "warning: ignoring overly long attributes line 1" >expect &&
+ test_cmp expect err &&
+ test_must_be_empty actual
+'
+
test_expect_success 'large attributes line ignores trailing content in tree' '
test_when_finished "rm .gitattributes" &&
# older versions of Git broke lines at 2048 bytes; the 2045 bytes
@@ -347,7 +356,18 @@ test_expect_success 'large attributes line ignores trailing content in tree' '
# erroneously parsed.
printf "a %02045dtrailing attribute\n" 1 >.gitattributes &&
git check-attr --all trailing >actual 2>err &&
- test_must_be_empty err &&
+ echo "warning: ignoring overly long attributes line 1" >expect &&
+ test_cmp expect err &&
+ test_must_be_empty actual
+'
+
+test_expect_success 'large attributes line ignored in index' '
+ test_when_finished "git update-index --remove .gitattributes" &&
+ blob=$(printf "path %02043d" 1 | git hash-object -w --stdin) &&
+ git update-index --add --cacheinfo 100644,$blob,.gitattributes &&
+ git check-attr --cached --all path >actual 2>err &&
+ echo "warning: ignoring overly long attributes line 1" >expect &&
+ test_cmp expect err &&
test_must_be_empty actual
'
@@ -356,7 +376,8 @@ test_expect_success 'large attributes line ignores trailing content in index' '
blob=$(printf "a %02045dtrailing attribute\n" 1 | git hash-object -w --stdin) &&
git update-index --add --cacheinfo 100644,$blob,.gitattributes &&
git check-attr --cached --all trailing >actual 2>err &&
- test_must_be_empty err &&
+ echo "warning: ignoring overly long attributes line 1" >expect &&
+ test_cmp expect err &&
test_must_be_empty actual
'
--
2.27.0

144
backport-CVE-2022-23521-attr-ignore-overly-large-gitattributes-files.patch Normal file
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@ -0,0 +1,144 @@
From 3c50032ff5289cc45659f21949c8d09e52164579 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:45:53 +0100
Subject: [PATCH] attr: ignore overly large gitattributes files
Similar as with the preceding commit, start ignoring gitattributes files
that are overly large to protect us against out-of-bounds reads and
writes caused by integer overflows. Unfortunately, we cannot just define
"overly large" in terms of any preexisting limits in the codebase.
Instead, we choose a very conservative limit of 100MB. This is plenty of
room for specifying gitattributes, and incidentally it is also the limit
for blob sizes for GitHub. While we don't want GitHub to dictate limits
here, it is still sensible to use this fact for an informed decision
given that it is hosting a huge set of repositories. Furthermore, over
at GitLab we scanned a subset of repositories for their root-level
attribute files. We found that 80% of them have a gitattributes file
smaller than 100kB, 99.99% have one smaller than 1MB, and only a single
repository had one that was almost 3MB in size. So enforcing a limit of
100MB seems to give us ample of headroom.
With this limit in place we can be reasonably sure that there is no easy
way to exploit the gitattributes file via integer overflows anymore.
Furthermore, it protects us against resource exhaustion caused by
allocating the in-memory data structures required to represent the
parsed attributes.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
attr.c | 24 ++++++++++++++++++++++--
attr.h | 6 ++++++
t/t0003-attributes.sh | 17 +++++++++++++++++
3 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/attr.c b/attr.c
index 38ecd2fff3..f9316d14ba 100644
--- a/attr.c
+++ b/attr.c
@@ -714,6 +714,7 @@ static struct attr_stack *read_attr_from_file(const char *path, unsigned flags)
FILE *fp;
struct attr_stack *res;
int lineno = 0;
+ struct stat st;
if (flags & READ_ATTR_NOFOLLOW)
fd = open_nofollow(path, O_RDONLY);
@@ -725,12 +725,22 @@ static struct attr_stack *read_attr_from_file(const char *path, unsigned flags)
return NULL;
}
fp = xfdopen(fd, "r");
+ if (fstat(fd, &st)) {
+ warning_errno(_("cannot fstat gitattributes file '%s'"), path);
+ fclose(fp);
+ return NULL;
+ }
+ if (st.st_size >= ATTR_MAX_FILE_SIZE) {
+ warning(_("ignoring overly large gitattributes file '%s'"), path);
+ fclose(fp);
+ return NULL;
+ }
CALLOC_ARRAY(res, 1);
while (strbuf_getline(&buf, fp) != EOF) {
if (!lineno && starts_with(buf.buf, utf8_bom))
strbuf_remove(&buf, 0, strlen(utf8_bom));
- handle_attr_line(res, buf.buf, path, ++lineno, macro_ok);
+ handle_attr_line(res, buf.buf, path, ++lineno, flags);
}
fclose(fp);
@@ -730,13 +745,18 @@ static struct attr_stack *read_attr_from_index(const struct index_state *istate,
struct attr_stack *res;
char *buf, *sp;
int lineno = 0;
+ size_t size;
if (!istate)
return NULL;
- buf = read_blob_data_from_index(istate, path, NULL);
+ buf = read_blob_data_from_index(istate, path, &size);
if (!buf)
return NULL;
+ if (size >= ATTR_MAX_FILE_SIZE) {
+ warning(_("ignoring overly large gitattributes blob '%s'"), path);
+ return NULL;
+ }
CALLOC_ARRAY(res, 1);
for (sp = buf; *sp; ) {
diff --git a/attr.h b/attr.h
index df9a75da55..5970f930fd 100644
--- a/attr.h
+++ b/attr.h
@@ -113,6 +113,12 @@
*/
#define ATTR_MAX_LINE_LENGTH 2048
+ /**
+ * The maximum size of the giattributes file. If the file exceeds this size we
+ * will ignore it.
+ */
+#define ATTR_MAX_FILE_SIZE (100 * 1024 * 1024)
+
struct index_state;
/**
diff --git a/t/t0003-attributes.sh b/t/t0003-attributes.sh
index 7d68e6a56e..9d9aa2855d 100755
--- a/t/t0003-attributes.sh
+++ b/t/t0003-attributes.sh
@@ -361,6 +361,14 @@ test_expect_success 'large attributes line ignores trailing content in tree' '
test_must_be_empty actual
'
+test_expect_success EXPENSIVE 'large attributes file ignored in tree' '
+ test_when_finished "rm .gitattributes" &&
+ dd if=/dev/zero of=.gitattributes bs=101M count=1 2>/dev/null &&
+ git check-attr --all path >/dev/null 2>err &&
+ echo "warning: ignoring overly large gitattributes file ${SQ}.gitattributes${SQ}" >expect &&
+ test_cmp expect err
+'
+
test_expect_success 'large attributes line ignored in index' '
test_when_finished "git update-index --remove .gitattributes" &&
blob=$(printf "path %02043d" 1 | git hash-object -w --stdin) &&
@@ -381,4 +389,13 @@ test_expect_success 'large attributes line ignores trailing content in index' '
test_must_be_empty actual
'
+test_expect_success EXPENSIVE 'large attributes file ignored in index' '
+ test_when_finished "git update-index --remove .gitattributes" &&
+ blob=$(dd if=/dev/zero bs=101M count=1 2>/dev/null | git hash-object -w --stdin) &&
+ git update-index --add --cacheinfo 100644,$blob,.gitattributes &&
+ git check-attr --cached --all path >/dev/null 2>err &&
+ echo "warning: ignoring overly large gitattributes blob ${SQ}.gitattributes${SQ}" >expect &&
+ test_cmp expect err
+'
+
test_done
--
2.27.0

94
backport-CVE-2022-41903-pretty-fix-adding-linefeed-when-placeholder-is-not-e.patch Normal file
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@ -0,0 +1,94 @@
From 1de69c0cdd388b0a5b7bdde0bfa0bda514a354b0 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:46:39 +0100
Subject: [PATCH] pretty: fix adding linefeed when placeholder is not expanded
When a formatting directive has a `+` or ` ` after the `%`, then we add
either a line feed or space if the placeholder expands to a non-empty
string. In specific cases though this logic doesn't work as expected,
and we try to add the character even in the case where the formatting
directive is empty.
One such pattern is `%w(1)%+d%+w(2)`. `%+d` expands to reference names
pointing to a certain commit, like in `git log --decorate`. For a tagged
commit this would for example expand to `\n (tag: v1.0.0)`, which has a
leading newline due to the `+` modifier and a space added by `%d`. Now
the second wrapping directive will cause us to rewrap the text to
`\n(tag:\nv1.0.0)`, which is one byte shorter due to the missing leading
space. The code that handles the `+` magic now notices that the length
has changed and will thus try to insert a leading line feed at the
original posititon. But as the string was shortened, the original
position is past the buffer's boundary and thus we die with an error.
Now there are two issues here:
1. We check whether the buffer length has changed, not whether it
has been extended. This causes us to try and add the character
past the string boundary.
2. The current logic does not make any sense whatsoever. When the
string got expanded due to the rewrap, putting the separator into
the original position is likely to put it somewhere into the
middle of the rewrapped contents.
It is debatable whether `%+w()` makes any sense in the first place.
Strictly speaking, the placeholder never expands to a non-empty string,
and consequentially we shouldn't ever accept this combination. We thus
fix the bug by simply refusing `%+w()`.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
pretty.c | 14 +++++++++++++-
t/t4205-log-pretty-formats.sh | 8 ++++++++
2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/pretty.c b/pretty.c
index d55b88607a..c6c757c0ce 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1597,9 +1597,21 @@ static size_t format_commit_item(struct strbuf *sb, /* in UTF-8 */
default:
break;
}
- if (magic != NO_MAGIC)
+ if (magic != NO_MAGIC) {
placeholder++;
+ switch (placeholder[0]) {
+ case 'w':
+ /*
+ * `%+w()` cannot ever expand to a non-empty string,
+ * and it potentially changes the layout of preceding
+ * contents. We're thus not able to handle the magic in
+ * this combination and refuse the pattern.
+ */
+ return 0;
+ };
+ }
+
orig_len = sb->len;
if (((struct format_commit_context *)context)->flush_type != no_flush)
consumed = format_and_pad_commit(sb, placeholder, context);
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index cdde37d325..1d768f7244 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -879,6 +879,14 @@ test_expect_success 'log --pretty with invalid padding format' '
test_cmp expect actual
'
+test_expect_success 'log --pretty with magical wrapping directives' '
+ commit_id=$(git commit-tree HEAD^{tree} -m "describe me") &&
+ git tag describe-me $commit_id &&
+ printf "\n(tag:\ndescribe-me)%%+w(2)" >expect &&
+ git log -1 --pretty="format:%w(1)%+d%+w(2)" $commit_id >actual &&
+ test_cmp expect actual
+'
+
test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' '
# We only assert that this command does not crash. This needs to be
# executed with the address sanitizer to demonstrate failure.
--
2.27.0

86
backport-CVE-2022-41903-pretty-fix-integer-overflow-in-wrapping-format.patch Normal file
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@ -0,0 +1,86 @@
From 48050c42c73c28b0c001d63d11dffac7e116847b Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:46:49 +0100
Subject: [PATCH] pretty: fix integer overflow in wrapping format
The `%w(width,indent1,indent2)` formatting directive can be used to
rewrap text to a specific width and is designed after git-shortlog(1)'s
`-w` parameter. While the three parameters are all stored as `size_t`
internally, `strbuf_add_wrapped_text()` accepts integers as input. As a
result, the casted integers may overflow. As these now-negative integers
are later on passed to `strbuf_addchars()`, we will ultimately run into
implementation-defined behaviour due to casting a negative number back
to `size_t` again. On my platform, this results in trying to allocate
9000 petabyte of memory.
Fix this overflow by using `cast_size_t_to_int()` so that we reject
inputs that cannot be represented as an integer.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
git-compat-util.h | 8 ++++++++
pretty.c | 4 +++-
t/t4205-log-pretty-formats.sh | 12 ++++++++++++
3 files changed, 23 insertions(+), 1 deletion(-)
diff --git a/git-compat-util.h b/git-compat-util.h
index f505f817d5..0ac1b7f560 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -918,6 +918,14 @@ static inline size_t st_sub(size_t a, size_t b)
return a - b;
}
+static inline int cast_size_t_to_int(size_t a)
+{
+ if (a > INT_MAX)
+ die("number too large to represent as int on this platform: %"PRIuMAX,
+ (uintmax_t)a);
+ return (int)a;
+}
+
#ifdef HAVE_ALLOCA_H
# include <alloca.h>
# define xalloca(size) (alloca(size))
diff --git a/pretty.c b/pretty.c
index c6c757c0ce..7e649b1cec 100644
--- a/pretty.c
+++ b/pretty.c
@@ -915,7 +915,9 @@ static void strbuf_wrap(struct strbuf *sb, size_t pos,
if (pos)
strbuf_add(&tmp, sb->buf, pos);
strbuf_add_wrapped_text(&tmp, sb->buf + pos,
- (int) indent1, (int) indent2, (int) width);
+ cast_size_t_to_int(indent1),
+ cast_size_t_to_int(indent2),
+ cast_size_t_to_int(width));
strbuf_swap(&tmp, sb);
strbuf_release(&tmp);
}
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index 1d768f7244..c88b64d08b 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -887,6 +887,18 @@ test_expect_success 'log --pretty with magical wrapping directives' '
test_cmp expect actual
'
+test_expect_success SIZE_T_IS_64BIT 'log --pretty with overflowing wrapping directive' '
+ cat >expect <<-EOF &&
+ fatal: number too large to represent as int on this platform: 2147483649
+ EOF
+ test_must_fail git log -1 --pretty="format:%w(2147483649,1,1)%d" 2>error &&
+ test_cmp expect error &&
+ test_must_fail git log -1 --pretty="format:%w(1,2147483649,1)%d" 2>error &&
+ test_cmp expect error &&
+ test_must_fail git log -1 --pretty="format:%w(1,1,2147483649)%d" 2>error &&
+ test_cmp expect error
+'
+
test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' '
# We only assert that this command does not crash. This needs to be
# executed with the address sanitizer to demonstrate failure.
--
2.27.0

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@ -0,0 +1,143 @@
From b49f309aa16febeddb65e82526640a91bbba3be3 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:46:30 +0100
Subject: [PATCH] pretty: fix out-of-bounds read when left-flushing with
stealing
With the `%>>(<N>)` pretty formatter, you can ask git-log(1) et al to
steal spaces. To do so we need to look ahead of the next token to see
whether there are spaces there. This loop takes into account ANSI
sequences that end with an `m`, and if it finds any it will skip them
until it finds the first space. While doing so it does not take into
account the buffer's limits though and easily does an out-of-bounds
read.
Add a test that hits this behaviour. While we don't have an easy way to
verify this, the test causes the following failure when run with
`SANITIZE=address`:
==37941==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x603000000baf at pc 0x55ba6f88e0d0 bp 0x7ffc84c50d20 sp 0x7ffc84c50d10
READ of size 1 at 0x603000000baf thread T0
#0 0x55ba6f88e0cf in format_and_pad_commit pretty.c:1712
#1 0x55ba6f88e7b4 in format_commit_item pretty.c:1801
#2 0x55ba6f9b1ae4 in strbuf_expand strbuf.c:429
#3 0x55ba6f88f020 in repo_format_commit_message pretty.c:1869
#4 0x55ba6f890ccf in pretty_print_commit pretty.c:2161
#5 0x55ba6f7884c8 in show_log log-tree.c:781
#6 0x55ba6f78b6ba in log_tree_commit log-tree.c:1117
#7 0x55ba6f40fed5 in cmd_log_walk_no_free builtin/log.c:508
#8 0x55ba6f41035b in cmd_log_walk builtin/log.c:549
#9 0x55ba6f4131a2 in cmd_log builtin/log.c:883
#10 0x55ba6f2ea993 in run_builtin git.c:466
#11 0x55ba6f2eb397 in handle_builtin git.c:721
#12 0x55ba6f2ebb07 in run_argv git.c:788
#13 0x55ba6f2ec8a7 in cmd_main git.c:923
#14 0x55ba6f581682 in main common-main.c:57
#15 0x7f2d08c3c28f (/usr/lib/libc.so.6+0x2328f)
#16 0x7f2d08c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
#17 0x55ba6f2e60e4 in _start ../sysdeps/x86_64/start.S:115
0x603000000baf is located 1 bytes to the left of 24-byte region [0x603000000bb0,0x603000000bc8)
allocated by thread T0 here:
#0 0x7f2d08ebe7ea in __interceptor_realloc /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:85
#1 0x55ba6fa5b494 in xrealloc wrapper.c:136
#2 0x55ba6f9aefdc in strbuf_grow strbuf.c:99
#3 0x55ba6f9b0a06 in strbuf_add strbuf.c:298
#4 0x55ba6f9b1a25 in strbuf_expand strbuf.c:418
#5 0x55ba6f88f020 in repo_format_commit_message pretty.c:1869
#6 0x55ba6f890ccf in pretty_print_commit pretty.c:2161
#7 0x55ba6f7884c8 in show_log log-tree.c:781
#8 0x55ba6f78b6ba in log_tree_commit log-tree.c:1117
#9 0x55ba6f40fed5 in cmd_log_walk_no_free builtin/log.c:508
#10 0x55ba6f41035b in cmd_log_walk builtin/log.c:549
#11 0x55ba6f4131a2 in cmd_log builtin/log.c:883
#12 0x55ba6f2ea993 in run_builtin git.c:466
#13 0x55ba6f2eb397 in handle_builtin git.c:721
#14 0x55ba6f2ebb07 in run_argv git.c:788
#15 0x55ba6f2ec8a7 in cmd_main git.c:923
#16 0x55ba6f581682 in main common-main.c:57
#17 0x7f2d08c3c28f (/usr/lib/libc.so.6+0x2328f)
#18 0x7f2d08c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
#19 0x55ba6f2e60e4 in _start ../sysdeps/x86_64/start.S:115
SUMMARY: AddressSanitizer: heap-buffer-overflow pretty.c:1712 in format_and_pad_commit
Shadow bytes around the buggy address:
0x0c067fff8120: fa fa fd fd fd fa fa fa fd fd fd fa fa fa fd fd
0x0c067fff8130: fd fd fa fa fd fd fd fd fa fa fd fd fd fa fa fa
0x0c067fff8140: fd fd fd fa fa fa fd fd fd fa fa fa fd fd fd fa
0x0c067fff8150: fa fa fd fd fd fd fa fa 00 00 00 fa fa fa fd fd
0x0c067fff8160: fd fa fa fa fd fd fd fa fa fa fd fd fd fa fa fa
=>0x0c067fff8170: fd fd fd fa fa[fa]00 00 00 fa fa fa 00 00 00 fa
0x0c067fff8180: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8190: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff81a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff81b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff81c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Luckily enough, this would only cause us to copy the out-of-bounds data
into the formatted commit in case we really had an ANSI sequence
preceding our buffer. So this bug likely has no security consequences.
Fix it regardless by not traversing past the buffer's start.
Reported-by: Patrick Steinhardt <ps@pks.im>
Reported-by: Eric Sesterhenn <eric.sesterhenn@x41-dsec.de>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
pretty.c | 2 +-
t/t4205-log-pretty-formats.sh | 6 ++++++
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/pretty.c b/pretty.c
index a1a01492c1..692a6382a1 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1514,7 +1514,7 @@ static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
if (*ch != 'm')
break;
p = ch - 1;
- while (ch - p < 10 && *p != '\033')
+ while (p > sb->buf && ch - p < 10 && *p != '\033')
p--;
if (*p != '\033' ||
ch + 1 - p != display_mode_esc_sequence_len(p))
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index fff3e05615..126dc20f23 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -867,6 +867,12 @@ test_expect_success 'log --pretty=reference is colored appropriately' '
test_cmp expect actual
'
+test_expect_success 'log --pretty with space stealing' '
+ printf mm0 >expect &&
+ git log -1 --pretty="format:mm%>>|(1)%x30" >actual &&
+ test_cmp expect actual
+'
+
test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' '
# We only assert that this command does not crash. This needs to be
# executed with the address sanitizer to demonstrate failure.
--
2.27.0

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@ -0,0 +1,147 @@
From f6e0b9f38987ad5e47bab551f8760b70689a5905 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:46:34 +0100
Subject: [PATCH] pretty: fix out-of-bounds read when parsing invalid padding
format
An out-of-bounds read can be triggered when parsing an incomplete
padding format string passed via `--pretty=format` or in Git archives
when files are marked with the `export-subst` gitattribute.
This bug exists since we have introduced support for truncating output
via the `trunc` keyword a7f01c6b4d (pretty: support truncating in %>, %<
and %><, 2013-04-19). Before this commit, we used to find the end of the
formatting string by using strchr(3P). This function returns a `NULL`
pointer in case the character in question wasn't found. The subsequent
check whether any character was found thus simply checked the returned
pointer. After the commit we switched to strcspn(3P) though, which only
returns the offset to the first found character or to the trailing NUL
byte. As the end pointer is now computed by adding the offset to the
start pointer it won't be `NULL` anymore, and as a consequence the check
doesn't do anything anymore.
The out-of-bounds data that is being read can in fact end up in the
formatted string. As a consequence, it is possible to leak memory
contents either by calling git-log(1) or via git-archive(1) when any of
the archived files is marked with the `export-subst` gitattribute.
==10888==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000000398 at pc 0x7f0356047cb2 bp 0x7fff3ffb95d0 sp 0x7fff3ffb8d78
READ of size 1 at 0x602000000398 thread T0
#0 0x7f0356047cb1 in __interceptor_strchrnul /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:725
#1 0x563b7cec9a43 in strbuf_expand strbuf.c:417
#2 0x563b7cda7060 in repo_format_commit_message pretty.c:1869
#3 0x563b7cda8d0f in pretty_print_commit pretty.c:2161
#4 0x563b7cca04c8 in show_log log-tree.c:781
#5 0x563b7cca36ba in log_tree_commit log-tree.c:1117
#6 0x563b7c927ed5 in cmd_log_walk_no_free builtin/log.c:508
#7 0x563b7c92835b in cmd_log_walk builtin/log.c:549
#8 0x563b7c92b1a2 in cmd_log builtin/log.c:883
#9 0x563b7c802993 in run_builtin git.c:466
#10 0x563b7c803397 in handle_builtin git.c:721
#11 0x563b7c803b07 in run_argv git.c:788
#12 0x563b7c8048a7 in cmd_main git.c:923
#13 0x563b7ca99682 in main common-main.c:57
#14 0x7f0355e3c28f (/usr/lib/libc.so.6+0x2328f)
#15 0x7f0355e3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
#16 0x563b7c7fe0e4 in _start ../sysdeps/x86_64/start.S:115
0x602000000398 is located 0 bytes to the right of 8-byte region [0x602000000390,0x602000000398)
allocated by thread T0 here:
#0 0x7f0356072faa in __interceptor_strdup /usr/src/debug/gcc/libsanitizer/asan/asan_interceptors.cpp:439
#1 0x563b7cf7317c in xstrdup wrapper.c:39
#2 0x563b7cd9a06a in save_user_format pretty.c:40
#3 0x563b7cd9b3e5 in get_commit_format pretty.c:173
#4 0x563b7ce54ea0 in handle_revision_opt revision.c:2456
#5 0x563b7ce597c9 in setup_revisions revision.c:2850
#6 0x563b7c9269e0 in cmd_log_init_finish builtin/log.c:269
#7 0x563b7c927362 in cmd_log_init builtin/log.c:348
#8 0x563b7c92b193 in cmd_log builtin/log.c:882
#9 0x563b7c802993 in run_builtin git.c:466
#10 0x563b7c803397 in handle_builtin git.c:721
#11 0x563b7c803b07 in run_argv git.c:788
#12 0x563b7c8048a7 in cmd_main git.c:923
#13 0x563b7ca99682 in main common-main.c:57
#14 0x7f0355e3c28f (/usr/lib/libc.so.6+0x2328f)
#15 0x7f0355e3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
#16 0x563b7c7fe0e4 in _start ../sysdeps/x86_64/start.S:115
SUMMARY: AddressSanitizer: heap-buffer-overflow /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:725 in __interceptor_strchrnul
Shadow bytes around the buggy address:
0x0c047fff8020: fa fa fd fd fa fa 00 06 fa fa 05 fa fa fa fd fd
0x0c047fff8030: fa fa 00 02 fa fa 06 fa fa fa 05 fa fa fa fd fd
0x0c047fff8040: fa fa 00 07 fa fa 03 fa fa fa fd fd fa fa 00 00
0x0c047fff8050: fa fa 00 01 fa fa fd fd fa fa 00 00 fa fa 00 01
0x0c047fff8060: fa fa 00 06 fa fa 00 06 fa fa 05 fa fa fa 05 fa
=>0x0c047fff8070: fa fa 00[fa]fa fa fd fa fa fa fd fd fa fa fd fd
0x0c047fff8080: fa fa fd fd fa fa 00 00 fa fa 00 fa fa fa fd fa
0x0c047fff8090: fa fa fd fd fa fa 00 00 fa fa fa fa fa fa fa fa
0x0c047fff80a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff80b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff80c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==10888==ABORTING
Fix this bug by checking whether `end` points at the trailing NUL byte.
Add a test which catches this out-of-bounds read and which demonstrates
that we used to write out-of-bounds data into the formatted message.
Reported-by: Markus Vervier <markus.vervier@x41-dsec.de>
Original-patch-by: Markus Vervier <markus.vervier@x41-dsec.de>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
pretty.c | 2 +-
t/t4205-log-pretty-formats.sh | 6 ++++++
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/pretty.c b/pretty.c
index 692a6382a1..d55b88607a 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1041,7 +1041,7 @@ static size_t parse_padding_placeholder(const char *placeholder,
const char *end = start + strcspn(start, ",)");
char *next;
int width;
- if (!end || end == start)
+ if (!*end || end == start)
return 0;
width = strtol(start, &next, 10);
if (next == start || width == 0)
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index 126dc20f23..cdde37d325 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -873,6 +873,12 @@ test_expect_success 'log --pretty with space stealing' '
test_cmp expect actual
'
+test_expect_success 'log --pretty with invalid padding format' '
+ printf "%s%%<(20" "$(git rev-parse HEAD)" >expect &&
+ git log -1 --pretty="format:%H%<(20" >actual &&
+ test_cmp expect actual
+'
+
test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' '
# We only assert that this command does not crash. This needs to be
# executed with the address sanitizer to demonstrate failure.
--
2.27.0

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@ -0,0 +1,183 @@
From 81dc898df9b4b4035534a927f3234a3839b698bf Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:46:25 +0100
Subject: [PATCH] pretty: fix out-of-bounds write caused by integer overflow
When using a padding specifier in the pretty format passed to git-log(1)
we need to calculate the string length in several places. These string
lengths are stored in `int`s though, which means that these can easily
overflow when the input lengths exceeds 2GB. This can ultimately lead to
an out-of-bounds write when these are used in a call to memcpy(3P):
==8340==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7f1ec62f97fe at pc 0x7f2127e5f427 bp 0x7ffd3bd63de0 sp 0x7ffd3bd63588
WRITE of size 1 at 0x7f1ec62f97fe thread T0
#0 0x7f2127e5f426 in __interceptor_memcpy /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827
#1 0x5628e96aa605 in format_and_pad_commit pretty.c:1762
#2 0x5628e96aa7f4 in format_commit_item pretty.c:1801
#3 0x5628e97cdb24 in strbuf_expand strbuf.c:429
#4 0x5628e96ab060 in repo_format_commit_message pretty.c:1869
#5 0x5628e96acd0f in pretty_print_commit pretty.c:2161
#6 0x5628e95a44c8 in show_log log-tree.c:781
#7 0x5628e95a76ba in log_tree_commit log-tree.c:1117
#8 0x5628e922bed5 in cmd_log_walk_no_free builtin/log.c:508
#9 0x5628e922c35b in cmd_log_walk builtin/log.c:549
#10 0x5628e922f1a2 in cmd_log builtin/log.c:883
#11 0x5628e9106993 in run_builtin git.c:466
#12 0x5628e9107397 in handle_builtin git.c:721
#13 0x5628e9107b07 in run_argv git.c:788
#14 0x5628e91088a7 in cmd_main git.c:923
#15 0x5628e939d682 in main common-main.c:57
#16 0x7f2127c3c28f (/usr/lib/libc.so.6+0x2328f)
#17 0x7f2127c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
#18 0x5628e91020e4 in _start ../sysdeps/x86_64/start.S:115
0x7f1ec62f97fe is located 2 bytes to the left of 4831838265-byte region [0x7f1ec62f9800,0x7f1fe62f9839)
allocated by thread T0 here:
#0 0x7f2127ebe7ea in __interceptor_realloc /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:85
#1 0x5628e98774d4 in xrealloc wrapper.c:136
#2 0x5628e97cb01c in strbuf_grow strbuf.c:99
#3 0x5628e97ccd42 in strbuf_addchars strbuf.c:327
#4 0x5628e96aa55c in format_and_pad_commit pretty.c:1761
#5 0x5628e96aa7f4 in format_commit_item pretty.c:1801
#6 0x5628e97cdb24 in strbuf_expand strbuf.c:429
#7 0x5628e96ab060 in repo_format_commit_message pretty.c:1869
#8 0x5628e96acd0f in pretty_print_commit pretty.c:2161
#9 0x5628e95a44c8 in show_log log-tree.c:781
#10 0x5628e95a76ba in log_tree_commit log-tree.c:1117
#11 0x5628e922bed5 in cmd_log_walk_no_free builtin/log.c:508
#12 0x5628e922c35b in cmd_log_walk builtin/log.c:549
#13 0x5628e922f1a2 in cmd_log builtin/log.c:883
#14 0x5628e9106993 in run_builtin git.c:466
#15 0x5628e9107397 in handle_builtin git.c:721
#16 0x5628e9107b07 in run_argv git.c:788
#17 0x5628e91088a7 in cmd_main git.c:923
#18 0x5628e939d682 in main common-main.c:57
#19 0x7f2127c3c28f (/usr/lib/libc.so.6+0x2328f)
#20 0x7f2127c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
#21 0x5628e91020e4 in _start ../sysdeps/x86_64/start.S:115
SUMMARY: AddressSanitizer: heap-buffer-overflow /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827 in __interceptor_memcpy
Shadow bytes around the buggy address:
0x0fe458c572a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe458c572b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe458c572c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe458c572d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0fe458c572e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0fe458c572f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa[fa]
0x0fe458c57300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe458c57310: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe458c57320: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe458c57330: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe458c57340: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==8340==ABORTING
The pretty format can also be used in `git archive` operations via the
`export-subst` attribute. So this is what in our opinion makes this a
critical issue in the context of Git forges which allow to download an
archive of user supplied Git repositories.
Fix this vulnerability by using `size_t` instead of `int` to track the
string lengths. Add tests which detect this vulnerability when Git is
compiled with the address sanitizer.
Reported-by: Joern Schneeweisz <jschneeweisz@gitlab.com>
Original-patch-by: Joern Schneeweisz <jschneeweisz@gitlab.com>
Modified-by: Taylor Blau <me@ttalorr.com>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
pretty.c | 11 ++++++-----
t/t4205-log-pretty-formats.sh | 17 +++++++++++++++++
2 files changed, 23 insertions(+), 5 deletions(-)
diff --git a/pretty.c b/pretty.c
index 7a7708a0ea..a1a01492c1 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1473,7 +1473,9 @@ static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
struct format_commit_context *c)
{
struct strbuf local_sb = STRBUF_INIT;
- int total_consumed = 0, len, padding = c->padding;
+ size_t total_consumed = 0;
+ int len, padding = c->padding;
+
if (padding < 0) {
const char *start = strrchr(sb->buf, '\n');
int occupied;
@@ -1485,7 +1487,7 @@ static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
}
while (1) {
int modifier = *placeholder == 'C';
- int consumed = format_commit_one(&local_sb, placeholder, c);
+ size_t consumed = format_commit_one(&local_sb, placeholder, c);
total_consumed += consumed;
if (!modifier)
@@ -1551,7 +1553,7 @@ static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
}
strbuf_addbuf(sb, &local_sb);
} else {
- int sb_len = sb->len, offset = 0;
+ size_t sb_len = sb->len, offset = 0;
if (c->flush_type == flush_left)
offset = padding - len;
else if (c->flush_type == flush_both)
@@ -1574,8 +1576,7 @@ static size_t format_commit_item(struct strbuf *sb, /* in UTF-8 */
const char *placeholder,
void *context)
{
- int consumed;
- size_t orig_len;
+ size_t consumed, orig_len;
enum {
NO_MAGIC,
ADD_LF_BEFORE_NON_EMPTY,
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index 204c149d5a..fff3e05615 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -867,4 +867,21 @@ test_expect_success 'log --pretty=reference is colored appropriately' '
test_cmp expect actual
'
+test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' '
+ # We only assert that this command does not crash. This needs to be
+ # executed with the address sanitizer to demonstrate failure.
+ git log -1 --pretty="format:%>(2147483646)%x41%41%>(2147483646)%x41" >/dev/null
+'
+
+test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'set up huge commit' '
+ test-tool genzeros 2147483649 | tr "\000" "1" >expect &&
+ huge_commit=$(git commit-tree -F expect HEAD^{tree})
+'
+
+test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' '
+ git log -1 --format="%B%<(1)%x30" $huge_commit >actual &&
+ echo 0 >>expect &&
+ test_cmp expect actual
+'
+
test_done
--
2.27.0

121
backport-CVE-2022-41903-pretty-restrict-input-lengths-for-padding-and-wrappi.patch Normal file
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@ -0,0 +1,121 @@
From 304a50adff6480ede46b68f7545baab542cbfb46 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:47:23 +0100
Subject: [PATCH] pretty: restrict input lengths for padding and wrapping
formats
Both the padding and wrapping formatting directives allow the caller to
specify an integer that ultimately leads to us adding this many chars to
the result buffer. As a consequence, it is trivial to e.g. allocate 2GB
of RAM via a single formatting directive and cause resource exhaustion
on the machine executing this logic. Furthermore, it is debatable
whether there are any sane usecases that require the user to pad data to
2GB boundaries or to indent wrapped data by 2GB.
Restrict the input sizes to 16 kilobytes at a maximum to limit the
amount of bytes that can be requested by the user. This is not meant
as a fix because there are ways to trivially amplify the amount of
data we generate via formatting directives; the real protection is
achieved by the changes in previous steps to catch and avoid integer
wraparound that causes us to under-allocate and access beyond the
end of allocated memory reagions. But having such a limit
significantly helps fuzzing the pretty format, because the fuzzer is
otherwise quite fast to run out-of-memory as it discovers these
formatters.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
pretty.c | 26 ++++++++++++++++++++++++++
t/t4205-log-pretty-formats.sh | 24 +++++++++++++++---------
2 files changed, 41 insertions(+), 9 deletions(-)
diff --git a/pretty.c b/pretty.c
index aae6e792bc..e2285572c4 100644
--- a/pretty.c
+++ b/pretty.c
@@ -13,6 +13,13 @@
#include "trailer.h"
#include "run-command.h"
+/*
+ * The limit for formatting directives, which enable the caller to append
+ * arbitrarily many bytes to the formatted buffer. This includes padding
+ * and wrapping formatters.
+ */
+#define FORMATTING_LIMIT (16 * 1024)
+
static char *user_format;
static struct cmt_fmt_map {
const char *name;
@@ -1046,6 +1053,15 @@ static size_t parse_padding_placeholder(const char *placeholder,
if (!*end || end == start)
return 0;
width = strtol(start, &next, 10);
+
+ /*
+ * We need to limit the amount of padding, or otherwise this
+ * would allow the user to pad the buffer by arbitrarily many
+ * bytes and thus cause resource exhaustion.
+ */
+ if (width < -FORMATTING_LIMIT || width > FORMATTING_LIMIT)
+ return 0;
+
if (next == start || width == 0)
return 0;
if (width < 0) {
@@ -1205,6 +1221,16 @@ static size_t format_commit_one(struct strbuf *sb, /* in UTF-8 */
if (*next != ')')
return 0;
}
+
+ /*
+ * We need to limit the format here as it allows the
+ * user to prepend arbitrarily many bytes to the buffer
+ * when rewrapping.
+ */
+ if (width > FORMATTING_LIMIT ||
+ indent1 > FORMATTING_LIMIT ||
+ indent2 > FORMATTING_LIMIT)
+ return 0;
rewrap_message_tail(sb, c, width, indent1, indent2);
return end - placeholder + 1;
} else
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index 5c5b56596e..84c61dfc48 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -888,15 +888,21 @@ test_expect_success 'log --pretty with magical wrapping directives' '
'
test_expect_success SIZE_T_IS_64BIT 'log --pretty with overflowing wrapping directive' '
- cat >expect <<-EOF &&
- fatal: number too large to represent as int on this platform: 2147483649
- EOF
- test_must_fail git log -1 --pretty="format:%w(2147483649,1,1)%d" 2>error &&
- test_cmp expect error &&
- test_must_fail git log -1 --pretty="format:%w(1,2147483649,1)%d" 2>error &&
- test_cmp expect error &&
- test_must_fail git log -1 --pretty="format:%w(1,1,2147483649)%d" 2>error &&
- test_cmp expect error
+ printf "%%w(2147483649,1,1)0" >expect &&
+ git log -1 --pretty="format:%w(2147483649,1,1)%x30" >actual &&
+ test_cmp expect actual &&
+ printf "%%w(1,2147483649,1)0" >expect &&
+ git log -1 --pretty="format:%w(1,2147483649,1)%x30" >actual &&
+ test_cmp expect actual &&
+ printf "%%w(1,1,2147483649)0" >expect &&
+ git log -1 --pretty="format:%w(1,1,2147483649)%x30" >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success SIZE_T_IS_64BIT 'log --pretty with overflowing padding directive' '
+ printf "%%<(2147483649)0" >expect &&
+ git log -1 --pretty="format:%<(2147483649)%x30" >actual &&
+ test_cmp expect actual
'
test_expect_success 'log --pretty with padding and preceding control chars' '
--
2.27.0

38
backport-CVE-2022-41903-test-lib-add-prerequisite-for-64-bit-platforms.patch Normal file
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@ -0,0 +1,38 @@
From a244dc5b0a629290881641467c7a545de7508ab2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlo=20Marcelo=20Arenas=20Bel=C3=B3n?= <carenas@gmail.com>
Date: Tue, 2 Nov 2021 15:46:06 +0000
Subject: [PATCH] test-lib: add prerequisite for 64-bit platforms
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Allow tests that assume a 64-bit `size_t` to be skipped in 32-bit
platforms and regardless of the size of `long`.
This imitates the `LONG_IS_64BIT` prerequisite.
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
t/test-lib.sh | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 9fa7c1d0f6..7d6e0f89d1 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1686,6 +1686,10 @@ build_option () {
sed -ne "s/^$1: //p"
}
+test_lazy_prereq SIZE_T_IS_64BIT '
+ test 8 -eq "$(build_option sizeof-size_t)"
+'
+
test_lazy_prereq LONG_IS_64BIT '
test 8 -le "$(build_option sizeof-long)"
'
--
2.27.0

95
backport-CVE-2022-41903-utf8-fix-checking-for-glyph-width-in-strbuf_utf8_rep.patch Normal file
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@ -0,0 +1,95 @@
From 81c2d4c3a5ba0e6ab8c348708441fed170e63a82 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:47:10 +0100
Subject: [PATCH] utf8: fix checking for glyph width in `strbuf_utf8_replace()`
In `strbuf_utf8_replace()`, we call `utf8_width()` to compute the width
of the current glyph. If the glyph is a control character though it can
be that `utf8_width()` returns `-1`, but because we assign this value to
a `size_t` the conversion will cause us to underflow. This bug can
easily be triggered with the following command:
$ git log --pretty='format:xxx%<|(1,trunc)%x10'
>From all I can see though this seems to be a benign underflow that has
no security-related consequences.
Fix the bug by using an `int` instead. When we see a control character,
we now copy it into the target buffer but don't advance the current
width of the string.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
t/t4205-log-pretty-formats.sh | 7 +++++++
utf8.c | 19 ++++++++++++++-----
2 files changed, 21 insertions(+), 5 deletions(-)
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index aac9e4ce6c..5c5b56596e 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -905,6 +905,13 @@ test_expect_success 'log --pretty with padding and preceding control chars' '
test_cmp expect actual
'
+test_expect_success 'log --pretty truncation with control chars' '
+ test_commit "$(printf "\20\20\20\20xxxx")" file contents commit-with-control-chars &&
+ printf "\20\20\20\20x.." >expect &&
+ git log -1 --pretty="format:%<(3,trunc)%s" commit-with-control-chars >actual &&
+ test_cmp expect actual
+'
+
test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' '
# We only assert that this command does not crash. This needs to be
# executed with the address sanitizer to demonstrate failure.
diff --git a/utf8.c b/utf8.c
index 30c7787cfa..077daf4b20 100644
--- a/utf8.c
+++ b/utf8.c
@@ -377,6 +377,7 @@ void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
dst = sb_dst.buf;
while (src < end) {
+ int glyph_width;
char *old;
size_t n;
@@ -390,21 +391,29 @@ void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
break;
old = src;
- n = utf8_width((const char**)&src, NULL);
- if (!src) /* broken utf-8, do nothing */
+ glyph_width = utf8_width((const char**)&src, NULL);
+ if (!src) /* broken utf-8, do nothing */
goto out;
- if (n && w >= pos && w < pos + width) {
+
+ /*
+ * In case we see a control character we copy it into the
+ * buffer, but don't add it to the width.
+ */
+ if (glyph_width < 0)
+ glyph_width = 0;
+
+ if (glyph_width && w >= pos && w < pos + width) {
if (subst) {
memcpy(dst, subst, subst_len);
dst += subst_len;
subst = NULL;
}
- w += n;
+ w += glyph_width;
continue;
}
memcpy(dst, old, src - old);
dst += src - old;
- w += n;
+ w += glyph_width;
}
strbuf_setlen(&sb_dst, dst - sb_dst.buf);
strbuf_swap(sb_src, &sb_dst);
--
2.27.0

158
backport-CVE-2022-41903-utf8-fix-overflow-when-returning-string-width.patch Normal file
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@ -0,0 +1,158 @@
From 937b71cc8b5b998963a7f9a33312ba3549d55510 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:47:04 +0100
Subject: [PATCH] utf8: fix overflow when returning string width
The return type of both `utf8_strwidth()` and `utf8_strnwidth()` is
`int`, but we operate on string lengths which are typically of type
`size_t`. This means that when the string is longer than `INT_MAX`, we
will overflow and thus return a negative result.
This can lead to an out-of-bounds write with `--pretty=format:%<1)%B`
and a commit message that is 2^31+1 bytes long:
=================================================================
==26009==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x603000001168 at pc 0x7f95c4e5f427 bp 0x7ffd8541c900 sp 0x7ffd8541c0a8
WRITE of size 2147483649 at 0x603000001168 thread T0
#0 0x7f95c4e5f426 in __interceptor_memcpy /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827
#1 0x5612bbb1068c in format_and_pad_commit pretty.c:1763
#2 0x5612bbb1087a in format_commit_item pretty.c:1801
#3 0x5612bbc33bab in strbuf_expand strbuf.c:429
#4 0x5612bbb110e7 in repo_format_commit_message pretty.c:1869
#5 0x5612bbb12d96 in pretty_print_commit pretty.c:2161
#6 0x5612bba0a4d5 in show_log log-tree.c:781
#7 0x5612bba0d6c7 in log_tree_commit log-tree.c:1117
#8 0x5612bb691ed5 in cmd_log_walk_no_free builtin/log.c:508
#9 0x5612bb69235b in cmd_log_walk builtin/log.c:549
#10 0x5612bb6951a2 in cmd_log builtin/log.c:883
#11 0x5612bb56c993 in run_builtin git.c:466
#12 0x5612bb56d397 in handle_builtin git.c:721
#13 0x5612bb56db07 in run_argv git.c:788
#14 0x5612bb56e8a7 in cmd_main git.c:923
#15 0x5612bb803682 in main common-main.c:57
#16 0x7f95c4c3c28f (/usr/lib/libc.so.6+0x2328f)
#17 0x7f95c4c3c349 in __libc_start_main (/usr/lib/libc.so.6+0x23349)
#18 0x5612bb5680e4 in _start ../sysdeps/x86_64/start.S:115
0x603000001168 is located 0 bytes to the right of 24-byte region [0x603000001150,0x603000001168)
allocated by thread T0 here:
#0 0x7f95c4ebe7ea in __interceptor_realloc /usr/src/debug/gcc/libsanitizer/asan/asan_malloc_linux.cpp:85
#1 0x5612bbcdd556 in xrealloc wrapper.c:136
#2 0x5612bbc310a3 in strbuf_grow strbuf.c:99
#3 0x5612bbc32acd in strbuf_add strbuf.c:298
#4 0x5612bbc33aec in strbuf_expand strbuf.c:418
#5 0x5612bbb110e7 in repo_format_commit_message pretty.c:1869
#6 0x5612bbb12d96 in pretty_print_commit pretty.c:2161
#7 0x5612bba0a4d5 in show_log log-tree.c:781
#8 0x5612bba0d6c7 in log_tree_commit log-tree.c:1117
#9 0x5612bb691ed5 in cmd_log_walk_no_free builtin/log.c:508
#10 0x5612bb69235b in cmd_log_walk builtin/log.c:549
#11 0x5612bb6951a2 in cmd_log builtin/log.c:883
#12 0x5612bb56c993 in run_builtin git.c:466
#13 0x5612bb56d397 in handle_builtin git.c:721
#14 0x5612bb56db07 in run_argv git.c:788
#15 0x5612bb56e8a7 in cmd_main git.c:923
#16 0x5612bb803682 in main common-main.c:57
#17 0x7f95c4c3c28f (/usr/lib/libc.so.6+0x2328f)
SUMMARY: AddressSanitizer: heap-buffer-overflow /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827 in __interceptor_memcpy
Shadow bytes around the buggy address:
0x0c067fff81d0: fd fd fd fa fa fa fd fd fd fa fa fa fd fd fd fa
0x0c067fff81e0: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
0x0c067fff81f0: fd fa fa fa fd fd fd fa fa fa fd fd fd fa fa fa
0x0c067fff8200: fd fd fd fa fa fa fd fd fd fd fa fa 00 00 00 fa
0x0c067fff8210: fa fa fd fd fd fa fa fa fd fd fd fa fa fa fd fd
=>0x0c067fff8220: fd fa fa fa fd fd fd fa fa fa 00 00 00[fa]fa fa
0x0c067fff8230: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8240: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8250: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8260: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff8270: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==26009==ABORTING
Now the proper fix for this would be to convert both functions to return
an `size_t` instead of an `int`. But given that this commit may be part
of a security release, let's instead do the minimal viable fix and die
in case we see an overflow.
Add a test that would have previously caused us to crash.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
t/t4205-log-pretty-formats.sh | 8 ++++++++
utf8.c | 12 +++++++++---
2 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index e3905baa3c..aac9e4ce6c 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -922,4 +922,12 @@ test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit mes
test_cmp expect actual
'
+test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message does not cause allocation failure' '
+ test_must_fail git log -1 --format="%<(1)%B" $huge_commit 2>error &&
+ cat >expect <<-EOF &&
+ fatal: number too large to represent as int on this platform: 2147483649
+ EOF
+ test_cmp expect error
+'
+
test_done
diff --git a/utf8.c b/utf8.c
index 6a21fd6a7b..30c7787cfa 100644
--- a/utf8.c
+++ b/utf8.c
@@ -208,11 +208,12 @@ int utf8_width(const char **start, size_t *remainder_p)
*/
int utf8_strnwidth(const char *string, size_t len, int skip_ansi)
{
- int width = 0;
const char *orig = string;
+ size_t width = 0;
while (string && string < orig + len) {
- int glyph_width, skip;
+ int glyph_width;
+ size_t skip;
while (skip_ansi &&
(skip = display_mode_esc_sequence_len(string)) != 0)
@@ -222,7 +223,12 @@ int utf8_strnwidth(const char *string, size_t len, int skip_ansi)
if (glyph_width > 0)
width += glyph_width;
}
- return string ? width : len;
+
+ /*
+ * TODO: fix the interface of this function and `utf8_strwidth()` to
+ * return `size_t` instead of `int`.
+ */
+ return cast_size_t_to_int(string ? width : len);
}
int utf8_strwidth(const char *string)
--
2.27.0

63
backport-CVE-2022-41903-utf8-fix-returning-negative-string-width.patch Normal file
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@ -0,0 +1,63 @@
From 17d23e8a3812a5ca3dd6564e74d5250f22e5d76d Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:47:00 +0100
Subject: [PATCH] utf8: fix returning negative string width
The `utf8_strnwidth()` function calls `utf8_width()` in a loop and adds
its returned width to the end result. `utf8_width()` can return `-1`
though in case it reads a control character, which means that the
computed string width is going to be wrong. In the worst case where
there are more control characters than non-control characters, we may
even return a negative string width.
Fix this bug by treating control characters as having zero width.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
t/t4205-log-pretty-formats.sh | 6 ++++++
utf8.c | 8 ++++++--
2 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/t/t4205-log-pretty-formats.sh b/t/t4205-log-pretty-formats.sh
index c88b64d08b..e3905baa3c 100755
--- a/t/t4205-log-pretty-formats.sh
+++ b/t/t4205-log-pretty-formats.sh
@@ -899,6 +899,12 @@ test_expect_success SIZE_T_IS_64BIT 'log --pretty with overflowing wrapping dire
test_cmp expect error
'
+test_expect_success 'log --pretty with padding and preceding control chars' '
+ printf "\20\20 0" >expect &&
+ git log -1 --pretty="format:%x10%x10%>|(4)%x30" >actual &&
+ test_cmp expect actual
+'
+
test_expect_success EXPENSIVE,SIZE_T_IS_64BIT 'log --pretty with huge commit message' '
# We only assert that this command does not crash. This needs to be
# executed with the address sanitizer to demonstrate failure.
diff --git a/utf8.c b/utf8.c
index 504e517c34..6a21fd6a7b 100644
--- a/utf8.c
+++ b/utf8.c
@@ -212,11 +212,15 @@ int utf8_strnwidth(const char *string, size_t len, int skip_ansi)
const char *orig = string;
while (string && string < orig + len) {
- int skip;
+ int glyph_width, skip;
+
while (skip_ansi &&
(skip = display_mode_esc_sequence_len(string)) != 0)
string += skip;
- width += utf8_width(&string, NULL);
+
+ glyph_width = utf8_width(&string, NULL);
+ if (glyph_width > 0)
+ width += glyph_width;
}
return string ? width : len;
}
--
2.27.0

119
backport-CVE-2022-41903-utf8-fix-truncated-string-lengths-in-utf8_strnwidth.patch Normal file
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@ -0,0 +1,119 @@
From 522cc87fdc25449222a5894a428eebf4b8d5eaa9 Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:46:53 +0100
Subject: [PATCH] utf8: fix truncated string lengths in `utf8_strnwidth()`
The `utf8_strnwidth()` function accepts an optional string length as
input parameter. This parameter can either be set to `-1`, in which case
we call `strlen()` on the input. Or it can be set to a positive integer
that indicates a precomputed length, which callers typically compute by
calling `strlen()` at some point themselves.
The input parameter is an `int` though, whereas `strlen()` returns a
`size_t`. This can lead to implementation-defined behaviour though when
the `size_t` cannot be represented by the `int`. In the general case
though this leads to wrap-around and thus to negative string sizes,
which is sure enough to not lead to well-defined behaviour.
Fix this by accepting a `size_t` instead of an `int` as string length.
While this takes away the ability of callers to simply pass in `-1` as
string length, it really is trivial enough to convert them to instead
pass in `strlen()` instead.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
column.c | 2 +-
pretty.c | 4 ++--
utf8.c | 8 +++-----
utf8.h | 2 +-
4 files changed, 7 insertions(+), 9 deletions(-)
diff --git a/column.c b/column.c
index 1261e18a72..fbf88639aa 100644
--- a/column.c
+++ b/column.c
@@ -23,7 +23,7 @@ struct column_data {
/* return length of 's' in letters, ANSI escapes stripped */
static int item_length(const char *s)
{
- return utf8_strnwidth(s, -1, 1);
+ return utf8_strnwidth(s, strlen(s), 1);
}
/*
diff --git a/pretty.c b/pretty.c
index 7e649b1cec..aae6e792bc 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1483,7 +1483,7 @@ static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
int occupied;
if (!start)
start = sb->buf;
- occupied = utf8_strnwidth(start, -1, 1);
+ occupied = utf8_strnwidth(start, strlen(start), 1);
occupied += c->pretty_ctx->graph_width;
padding = (-padding) - occupied;
}
@@ -1501,7 +1501,7 @@ static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
placeholder++;
total_consumed++;
}
- len = utf8_strnwidth(local_sb.buf, -1, 1);
+ len = utf8_strnwidth(local_sb.buf, local_sb.len, 1);
if (c->flush_type == flush_left_and_steal) {
const char *ch = sb->buf + sb->len - 1;
diff --git a/utf8.c b/utf8.c
index 5b39361ada..504e517c34 100644
--- a/utf8.c
+++ b/utf8.c
@@ -206,13 +206,11 @@ int utf8_width(const char **start, size_t *remainder_p)
* string, assuming that the string is utf8. Returns strlen() instead
* if the string does not look like a valid utf8 string.
*/
-int utf8_strnwidth(const char *string, int len, int skip_ansi)
+int utf8_strnwidth(const char *string, size_t len, int skip_ansi)
{
int width = 0;
const char *orig = string;
- if (len == -1)
- len = strlen(string);
while (string && string < orig + len) {
int skip;
while (skip_ansi &&
@@ -225,7 +223,7 @@ int utf8_strnwidth(const char *string, int len, int skip_ansi)
int utf8_strwidth(const char *string)
{
- return utf8_strnwidth(string, -1, 0);
+ return utf8_strnwidth(string, strlen(string), 0);
}
int is_utf8(const char *text)
@@ -791,7 +789,7 @@ int skip_utf8_bom(char **text, size_t len)
void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int width,
const char *s)
{
- int slen = strlen(s);
+ size_t slen = strlen(s);
int display_len = utf8_strnwidth(s, slen, 0);
int utf8_compensation = slen - display_len;
diff --git a/utf8.h b/utf8.h
index fcd5167baf..6da1b6d05e 100644
--- a/utf8.h
+++ b/utf8.h
@@ -7,7 +7,7 @@ typedef unsigned int ucs_char_t; /* assuming 32bit int */
size_t display_mode_esc_sequence_len(const char *s);
int utf8_width(const char **start, size_t *remainder_p);
-int utf8_strnwidth(const char *string, int len, int skip_ansi);
+int utf8_strnwidth(const char *string, size_t len, int skip_ansi);
int utf8_strwidth(const char *string);
int is_utf8(const char *text);
int is_encoding_utf8(const char *name);
--
2.27.0

87
backport-CVE-2022-41903-utf8-refactor-strbuf_utf8_replace-to-not-rely-on-pre.patch Normal file
View File

@ -0,0 +1,87 @@
From f930a2394303b902e2973f4308f96529f736b8bc Mon Sep 17 00:00:00 2001
From: Patrick Steinhardt <ps@pks.im>
Date: Thu, 1 Dec 2022 15:47:15 +0100
Subject: [PATCH] utf8: refactor `strbuf_utf8_replace` to not rely on
preallocated buffer
In `strbuf_utf8_replace`, we preallocate the destination buffer and then
use `memcpy` to copy bytes into it at computed offsets. This feels
rather fragile and is hard to understand at times. Refactor the code to
instead use `strbuf_add` and `strbuf_addstr` so that we can be sure that
there is no possibility to perform an out-of-bounds write.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
utf8.c | 34 +++++++++++++---------------------
1 file changed, 13 insertions(+), 21 deletions(-)
diff --git a/utf8.c b/utf8.c
index 077daf4b20..d8a16af87c 100644
--- a/utf8.c
+++ b/utf8.c
@@ -365,26 +365,20 @@ void strbuf_add_wrapped_bytes(struct strbuf *buf, const char *data, int len,
void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
const char *subst)
{
- struct strbuf sb_dst = STRBUF_INIT;
- char *src = sb_src->buf;
- char *end = src + sb_src->len;
- char *dst;
- int w = 0, subst_len = 0;
+ const char *src = sb_src->buf, *end = sb_src->buf + sb_src->len;
+ struct strbuf dst;
+ int w = 0;
- if (subst)
- subst_len = strlen(subst);
- strbuf_grow(&sb_dst, sb_src->len + subst_len);
- dst = sb_dst.buf;
+ strbuf_init(&dst, sb_src->len);
while (src < end) {
+ const char *old;
int glyph_width;
- char *old;
size_t n;
while ((n = display_mode_esc_sequence_len(src))) {
- memcpy(dst, src, n);
+ strbuf_add(&dst, src, n);
src += n;
- dst += n;
}
if (src >= end)
@@ -404,21 +398,19 @@ void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
if (glyph_width && w >= pos && w < pos + width) {
if (subst) {
- memcpy(dst, subst, subst_len);
- dst += subst_len;
+ strbuf_addstr(&dst, subst);
subst = NULL;
}
- w += glyph_width;
- continue;
+ } else {
+ strbuf_add(&dst, old, src - old);
}
- memcpy(dst, old, src - old);
- dst += src - old;
+
w += glyph_width;
}
- strbuf_setlen(&sb_dst, dst - sb_dst.buf);
- strbuf_swap(sb_src, &sb_dst);
+
+ strbuf_swap(sb_src, &dst);
out:
- strbuf_release(&sb_dst);
+ strbuf_release(&dst);
}
/*
--
2.27.0

30
git.spec
View File

@ -1,7 +1,7 @@
%global gitexecdir %{_libexecdir}/git-core
Name: git
Version: 2.33.0
Release: 5
Release: 6
Summary: A popular and widely used Version Control System
License: GPLv2+ or LGPLv2.1
URL: https://git-scm.com/
@ -24,6 +24,28 @@ Patch8: backport-CVE-2022-39253-builtin-clone.c-disallow-local-clones-with-s
Patch9: backport-CVE-2022-39260-shell-add-basic-tests.patch
Patch10: backport-CVE-2022-39260-shell-limit-size-of-interactive-commands.patch
Patch11: backport-CVE-2022-39260-alias.c-reject-too-long-cmdline-strings-in-split_cmd.patch
Patch12: backport-CVE-2022-23521-attr-fix-overflow-when-upserting-attribute-with-over.patch
Patch13: backport-CVE-2022-23521-attr-fix-out-of-bounds-read-with-huge-attribute-name.patch
Patch14: backport-CVE-2022-23521-attr-fix-integer-overflow-when-parsing-huge-attribut.patch
Patch15: backport-CVE-2022-23521-attr-fix-out-of-bounds-write-when-parsing-huge-numbe.patch
Patch16: backport-CVE-2022-23521-attr-fix-out-of-bounds-read-with-unreasonable-amount.patch
Patch17: backport-CVE-2022-23521-attr-fix-integer-overflow-with-more-than-INT_MAX-mac.patch
Patch18: backport-CVE-2022-23521-attr-harden-allocation-against-integer-overflows.patch
Patch19: backport-CVE-2022-23521-attr-fix-silently-splitting-up-lines-longer-than-204.patch
Patch20: backport-CVE-2022-23521-attr-ignore-attribute-lines-exceeding-2048-bytes.patch
Patch21: backport-CVE-2022-23521-attr-ignore-overly-large-gitattributes-files.patch
Patch22: backport-CVE-2022-41903-test-lib-add-prerequisite-for-64-bit-platforms.patch
Patch23: backport-CVE-2022-41903-pretty-fix-out-of-bounds-write-caused-by-integer-ove.patch
Patch24: backport-CVE-2022-41903-pretty-fix-out-of-bounds-read-when-left-flushing-wit.patch
Patch25: backport-CVE-2022-41903-pretty-fix-out-of-bounds-read-when-parsing-invalid-p.patch
Patch26: backport-CVE-2022-41903-pretty-fix-adding-linefeed-when-placeholder-is-not-e.patch
Patch27: backport-CVE-2022-41903-pretty-fix-integer-overflow-in-wrapping-format.patch
Patch28: backport-CVE-2022-41903-utf8-fix-truncated-string-lengths-in-utf8_strnwidth.patch
Patch29: backport-CVE-2022-41903-utf8-fix-returning-negative-string-width.patch
Patch30: backport-CVE-2022-41903-utf8-fix-overflow-when-returning-string-width.patch
Patch31: backport-CVE-2022-41903-utf8-fix-checking-for-glyph-width-in-strbuf_utf8_rep.patch
Patch32: backport-CVE-2022-41903-utf8-refactor-strbuf_utf8_replace-to-not-rely-on-pre.patch
Patch33: backport-CVE-2022-41903-pretty-restrict-input-lengths-for-padding-and-wrappi.patch
BuildRequires: gcc gettext
BuildRequires: openssl-devel libcurl-devel expat-devel systemd asciidoc xmlto glib2-devel libsecret-devel pcre-devel desktop-file-utils
@ -304,6 +326,12 @@ make %{?_smp_mflags} test
%{_mandir}/man7/git*.7.*
%changelog
* Thu Jan 19 2023 fuanan <fuanan3@h-partners.com> - 2.33.0-6
- Type:CVE
- ID:CVE-2022-23521 CVE-2022-41903
- SUG:NA
- DESC:Fix CVE-2022-23521 CVE-2022-41903
* Fri Oct 21 2022 fuanan <fuanan3@h-partners.com> - 2.33.0-5
- Type:CVE
- ID:CVE-2022-39253 CVE-2022-39260