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!646 [sync] PR-645: Add static PIE support for LoongArch

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From: @openeuler-sync-bot 
Reviewed-by: @liqingqing_1229 
Signed-off-by: @liqingqing_1229
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openeuler-ci-bot 2023-07-31 02:40:38 +00:00 committed by Gitee
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4 changed files with 416 additions and 12 deletions
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162
LoongArch-Add-static-PIE-support.patch Normal file
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@ -0,0 +1,162 @@
From 82aa8c58156bbaab18bc44a80ca00159557c7f27 Mon Sep 17 00:00:00 2001
From: XingLi <lixing@loongson.cn>
Date: Thu, 27 Jul 2023 09:25:19 +0800
Subject: [PATCH 1/3] LoongArch: Add static PIE support
If the compiler is new enough, enable static PIE support. In the static
PIE version of _start (in rcrt1.o), use la.pcrel instead of la.got
because in a static PIE we cannot use GOT entries until the dynamic
relocations for GOT are resolved.
From: Xi Ruoyao <xry111@xry111.site>
Date: Sat, 24 Sep 2022 15:45:34 +0800
---
sysdeps/loongarch/configure | 51 ++++++++++++++++++++++++++++++++++
sysdeps/loongarch/configure.ac | 38 ++++++++++++++++++++++++-
sysdeps/loongarch/start.S | 14 ++++++++--
3 files changed, 99 insertions(+), 4 deletions(-)
diff --git a/sysdeps/loongarch/configure b/sysdeps/loongarch/configure
index 1e5abf81..db6341e8 100644
--- a/sysdeps/loongarch/configure
+++ b/sysdeps/loongarch/configure
@@ -2,3 +2,54 @@
# Local configure fragment for sysdeps/loongarch/elf.
#AC_DEFINE(PI_STATIC_AND_HIDDEN)
+$as_echo "#define HIDDEN_VAR_NEEDS_DYNAMIC_RELOC 1" >>confdefs.h
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if the toolchain is sufficient to build static PIE on LoongArch" >&5
+$as_echo_n "checking if the toolchain is sufficient to build static PIE on LoongArch... " >&6; }
+if ${libc_cv_static_pie_on_loongarch+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+
+ cat > conftest.S << EOF
+.global _start
+.type _start, @function
+_start:
+ li.w \$a7, 93
+ /* This ensures the assembler supports explicit reloc. */
+ pcalau12i \$a0, %pc_hi20(x)
+ ld.w \$a0, \$a0, %pc_lo12(x)
+ syscall 0
+
+.data
+x:
+ .word 0
+ /* This should produce an R_LARCH_RELATIVE in the static PIE. */
+ .dword _start
+EOF
+ libc_cv_static_pie_on_loongarch=no
+ if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest conftest.S'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } \
+ && { ac_try='LC_ALL=C $READELF -Wr conftest | grep -q R_LARCH_RELATIVE'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; }
+ then
+ libc_cv_static_pie_on_loongarch=yes
+ fi
+ rm -rf conftest.*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_static_pie_on_loongarch" >&5
+$as_echo "$libc_cv_static_pie_on_loongarch" >&6; }
+
+if test "$libc_cv_static_pie_on_loongarch" = yes; then
+ $as_echo "#define SUPPORT_STATIC_PIE 1" >>confdefs.h
+
+fi
+
diff --git a/sysdeps/loongarch/configure.ac b/sysdeps/loongarch/configure.ac
index 67b46ce0..603085cd 100644
--- a/sysdeps/loongarch/configure.ac
+++ b/sysdeps/loongarch/configure.ac
@@ -3,4 +3,40 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
dnl It is always possible to access static and hidden symbols in an
dnl position independent way.
-#AC_DEFINE(PI_STATIC_AND_HIDDEN)
+ AC_DEFINE(HIDDEN_VAR_NEEDS_DYNAMIC_RELOC)
+
+dnl Test if the toolchain is new enough for static PIE.
+dnl We need a GAS supporting explicit reloc (older GAS produces stack-based
+dnl reloc and triggers an internal error in the linker). And, we need GCC to
+dnl pass the correct linker flags for static PIE. GCC >= 13 and GAS >= 2.40
+dnl satisify the requirement, but a distro may backport static PIE support into
+dnl earlier GCC or Binutils releases as well.
+AC_CACHE_CHECK([if the toolchain is sufficient to build static PIE on LoongArch],
+libc_cv_static_pie_on_loongarch, [
+ cat > conftest.S << EOF
+.global _start
+.type _start, @function
+_start:
+ li.w \$a7, 93
+ /* This ensures the assembler supports explicit reloc. */
+ pcalau12i \$a0, %pc_hi20(x)
+ ld.w \$a0, \$a0, %pc_lo12(x)
+ syscall 0
+
+.data
+x:
+ .word 0
+ /* This should produce an R_LARCH_RELATIVE in the static PIE. */
+ .dword _start
+EOF
+ libc_cv_static_pie_on_loongarch=no
+ if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest conftest.S]) \
+ && AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest | grep -q R_LARCH_RELATIVE])
+ then
+ libc_cv_static_pie_on_loongarch=yes
+ fi
+ rm -rf conftest.*])
+
+if test "$libc_cv_static_pie_on_loongarch" = yes; then
+ AC_DEFINE(SUPPORT_STATIC_PIE)
+fi
diff --git a/sysdeps/loongarch/start.S b/sysdeps/loongarch/start.S
index 9ecfb5e2..cb2b6c5b 100644
--- a/sysdeps/loongarch/start.S
+++ b/sysdeps/loongarch/start.S
@@ -44,9 +44,17 @@ ENTRY (ENTRY_POINT)
cfi_undefined (1)
or a5, a0, zero /* rtld_fini */
+#if defined(PIC) && !defined(SHARED)
+/* For static PIE, the GOT cannot be used in _start because the GOT entries are
+ offsets instead of real addresses before __libc_start_main. */
+# define LA la.pcrel
+#else
/* We must get symbol main through GOT table, since main may not be local.
For instance: googletest defines main in dynamic library. */
- la.got a0, t0, main
+# define LA la.got
+#endif
+
+ LA a0, t0, main
#ifdef __loongarch_lp64
ld.d a1, sp, 0
addi.d a2, sp, SZREG
@@ -61,10 +69,10 @@ ENTRY (ENTRY_POINT)
move a4, zero /* used to be fini */
or a6, sp, zero /* stack_end */
- la.got ra, t0, __libc_start_main
+ LA ra, t0, __libc_start_main
jirl ra, ra, 0
- la.got ra, t0, abort
+ LA ra, t0, abort
jirl ra, ra, 0
END (ENTRY_POINT)
--
2.27.0

181
LoongArch-Fix-the-condition-to-use-PC-relative-addre.patch Normal file
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@ -0,0 +1,181 @@
From d29ac2028078612c6b4c25fb5be857ca35b37a3b Mon Sep 17 00:00:00 2001
From: XingLi <lixing@loongson.cn>
Date: Thu, 27 Jul 2023 09:32:21 +0800
Subject: [PATCH 2/3] LoongArch: Fix the condition to use PC-relative
addressing in start.S
A start.o compiled from start.S with -DPIC and no -DSHARED is used by
both crt1.o and rcrt1.o. So the LoongArch static PIE patch
unintentionally introduced PC-relative addressing for main and
__libc_start_main into crt1.o.
While the latest Binutils (trunk, which will be released as 2.40)
supports the PC-relative relocs against an external function by creating
a PLT entry, the 2.39 release branch doesn't (and won't) support this.
An error is raised:
"PLT stub does not represent and symbol not defined."
So, we need the following changes:
1. Check if ld supports the PC-relative relocs against an external
function. If it's not supported, we deem static PIE unsupported.
2. Change start.S. If static PIE is supported, use PC-relative
addressing for main and __libc_start_main and rely on the linker to
create PLT entries. Otherwise, restore the old behavior (using GOT
to address these functions).
An alternative would be adding a new "static-pie-start.S", and some
custom logic into Makefile to build rcrt1.o with it. And, restore
start.S to the state before static PIE change so crt1.o won't contain
PC-relative relocs against external symbols. But I can't see any
benefit of this alternative, so I'd just keep it simple.
Tested by building glibc with the following configurations:
1. Binutils trunk + GCC trunk. Static PIE enabled. All tests
passed.
2. Binutils 2.39 branch + GCC trunk. Static PIE disabled. Tests
related to ifunc failed (it's a known issue). All other tests
passed.
3. Binutils 2.39 branch + GCC 12 branch, cross compilation with
build-many-glibcs.py from x86_64-linux-gnu. Static PIE disabled.
Build succeeded.
From: Xi Ruoyao <xry111@xry111.site>
Date: Sun, 2 Oct 2022 22:23:09 +0800
---
sysdeps/loongarch/configure | 29 +++++++++++++++++++++++++----
sysdeps/loongarch/configure.ac | 18 ++++++++++++++----
sysdeps/loongarch/start.S | 11 +++++++----
3 files changed, 46 insertions(+), 12 deletions(-)
diff --git a/sysdeps/loongarch/configure b/sysdeps/loongarch/configure
index db6341e8..4f0ac252 100644
--- a/sysdeps/loongarch/configure
+++ b/sysdeps/loongarch/configure
@@ -11,7 +11,7 @@ if ${libc_cv_static_pie_on_loongarch+:} false; then :
$as_echo_n "(cached) " >&6
else
- cat > conftest.S << EOF
+ cat > conftest1.S << EOF
.global _start
.type _start, @function
_start:
@@ -27,14 +27,35 @@ x:
/* This should produce an R_LARCH_RELATIVE in the static PIE. */
.dword _start
EOF
+ cat > conftest2.S << EOF
+.global f
+.type f, @function
+f:
+ /* The linker should be able to handle this and produce a PLT entry. */
+ la.pcrel \$t0, \$t0, external_func
+ jirl \$zero, \$t0, 0
+EOF
+
libc_cv_static_pie_on_loongarch=no
- if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest conftest.S'
+ if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest1 conftest1.S'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } \
+ && { ac_try='LC_ALL=C $READELF -Wr conftest1 | grep -q R_LARCH_RELATIVE'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } \
+ && { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -shared -fPIC -o conftest2.so conftest2.S'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; } \
- && { ac_try='LC_ALL=C $READELF -Wr conftest | grep -q R_LARCH_RELATIVE'
+ && { ac_try='LC_ALL=C $READELF -Wr conftest2.so | grep -q 'R_LARCH_JUMP_SLOT.*external_func''
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
@@ -43,7 +64,7 @@ EOF
then
libc_cv_static_pie_on_loongarch=yes
fi
- rm -rf conftest.*
+ rm -rf conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_static_pie_on_loongarch" >&5
$as_echo "$libc_cv_static_pie_on_loongarch" >&6; }
diff --git a/sysdeps/loongarch/configure.ac b/sysdeps/loongarch/configure.ac
index 603085cd..bfe4e0f2 100644
--- a/sysdeps/loongarch/configure.ac
+++ b/sysdeps/loongarch/configure.ac
@@ -13,7 +13,7 @@ dnl satisify the requirement, but a distro may backport static PIE support into
dnl earlier GCC or Binutils releases as well.
AC_CACHE_CHECK([if the toolchain is sufficient to build static PIE on LoongArch],
libc_cv_static_pie_on_loongarch, [
- cat > conftest.S << EOF
+ cat > conftest1.S << EOF
.global _start
.type _start, @function
_start:
@@ -28,14 +28,24 @@ x:
.word 0
/* This should produce an R_LARCH_RELATIVE in the static PIE. */
.dword _start
+EOF
+ cat > conftest2.S << EOF
+.global f
+.type f, @function
+f:
+ /* The linker should be able to handle this and produce a PLT entry. */
+ la.pcrel \$t0, \$t0, external_func
+ jirl \$zero, \$t0, 0
EOF
libc_cv_static_pie_on_loongarch=no
- if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest conftest.S]) \
- && AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest | grep -q R_LARCH_RELATIVE])
+ if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest1 conftest1.S]) \
+ && AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest1 | grep -q R_LARCH_RELATIVE]) \
+ && AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -shared -fPIC -o conftest2.so conftest2.S]) \
+ && AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest2.so | grep -q 'R_LARCH_JUMP_SLOT.*external_func'])
then
libc_cv_static_pie_on_loongarch=yes
fi
- rm -rf conftest.*])
+ rm -rf conftest* ])
if test "$libc_cv_static_pie_on_loongarch" = yes; then
AC_DEFINE(SUPPORT_STATIC_PIE)
diff --git a/sysdeps/loongarch/start.S b/sysdeps/loongarch/start.S
index cb2b6c5b..11e4cede 100644
--- a/sysdeps/loongarch/start.S
+++ b/sysdeps/loongarch/start.S
@@ -44,13 +44,16 @@ ENTRY (ENTRY_POINT)
cfi_undefined (1)
or a5, a0, zero /* rtld_fini */
-#if defined(PIC) && !defined(SHARED)
+#if ENABLE_STATIC_PIE
/* For static PIE, the GOT cannot be used in _start because the GOT entries are
- offsets instead of real addresses before __libc_start_main. */
+ offsets instead of real addresses before __libc_start_main.
+ __libc_start_main and/or main may be not local, so we rely on the linker to
+ produce PLT entries for them. GNU ld >= 2.40 supports this. */
# define LA la.pcrel
#else
-/* We must get symbol main through GOT table, since main may not be local.
- For instance: googletest defines main in dynamic library. */
+/* Old GNU ld (< 2.40) cannot handle PC relative address against a non-local
+ function correctly. We deem these old linkers failing to support static PIE
+ and load the addresses from GOT. */
# define LA la.got
#endif
--
2.27.0

55
LoongArch-Further-refine-the-condition-to-enable-sta.patch Normal file
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@ -0,0 +1,55 @@
From 8e39b3ab56422fa2f5e65aa67fabd928f40c5e32 Mon Sep 17 00:00:00 2001
From: XingLi <lixing@loongson.cn>
Date: Thu, 27 Jul 2023 09:36:23 +0800
Subject: [PATCH 3/3] LoongArch: Further refine the condition to enable static
PIE
Before GCC r13-2728, it would produce a normal dynamic-linked executable
with -static-pie. I mistakely believed it would produce a static-linked
executable, so failed to detect the breakage. Then with Binutils 2.40
and (vanilla) GCC 12, libc_cv_static_pie_on_loongarch is mistakenly
enabled and cause a building failure with "undefined reference to
_DYNAMIC".
Fix the issue by disabling static PIE if -static-pie creates something
with a INTERP header.
From: Xi Ruoyao <xry111@xry111.site>
Date: Mon, 27 Feb 2023 19:08:09 +0800
---
sysdeps/loongarch/configure | 6 ++++++
sysdeps/loongarch/configure.ac | 1 +
2 files changed, 7 insertions(+)
diff --git a/sysdeps/loongarch/configure b/sysdeps/loongarch/configure
index 4f0ac252..9fec0a73 100644
--- a/sysdeps/loongarch/configure
+++ b/sysdeps/loongarch/configure
@@ -48,6 +48,12 @@ EOF
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; } \
+ && ! { ac_try='LC_ALL=C $READELF -Wl conftest1 | grep -q INTERP'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; } \
&& { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -shared -fPIC -o conftest2.so conftest2.S'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
diff --git a/sysdeps/loongarch/configure.ac b/sysdeps/loongarch/configure.ac
index bfe4e0f2..6d0b4d0d 100644
--- a/sysdeps/loongarch/configure.ac
+++ b/sysdeps/loongarch/configure.ac
@@ -40,6 +40,7 @@ EOF
libc_cv_static_pie_on_loongarch=no
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest1 conftest1.S]) \
&& AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest1 | grep -q R_LARCH_RELATIVE]) \
+ && ! AC_TRY_COMMAND([LC_ALL=C $READELF -Wl conftest1 | grep -q INTERP]) \
&& AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -shared -fPIC -o conftest2.so conftest2.S]) \
&& AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest2.so | grep -q 'R_LARCH_JUMP_SLOT.*external_func'])
then
--
2.27.0

30
glibc.spec
View File

@ -54,7 +54,7 @@
%endif %endif
# Only some architectures have static PIE support # Only some architectures have static PIE support
%define pie_arches %{ix86} x86_64 aarch64 %define pie_arches %{ix86} x86_64 aarch64 loongarch64
%define enablekernel 3.2 %define enablekernel 3.2
%define target %{_target_cpu}-%{_vendor}-linux %define target %{_target_cpu}-%{_vendor}-linux
@ -70,7 +70,7 @@
############################################################################## ##############################################################################
Name: glibc Name: glibc
Version: 2.34 Version: 2.34
Release: 127 Release: 128
Summary: The GNU libc libraries Summary: The GNU libc libraries
License: %{all_license} License: %{all_license}
URL: http://www.gnu.org/software/glibc/ URL: http://www.gnu.org/software/glibc/
@ -307,21 +307,24 @@ Patch9029: 5_6-LoongArch-Optimize-string-function-strcpy.patch
Patch9030: 6_6-LoongArch-Optimize-string-functions-strlen-strnlen.patch Patch9030: 6_6-LoongArch-Optimize-string-functions-strlen-strnlen.patch
Patch9031: math-Fix-asin-and-acos-invalid-exception-with-old-gc.patch Patch9031: math-Fix-asin-and-acos-invalid-exception-with-old-gc.patch
Patch9032: LoongArch-Fix-ptr-mangling-demangling-and-SHMLBA.patch Patch9032: LoongArch-Fix-ptr-mangling-demangling-and-SHMLBA.patch
Patch9033: LoongArch-Add-static-PIE-support.patch
Patch9034: LoongArch-Fix-the-condition-to-use-PC-relative-addre.patch
Patch9035: LoongArch-Further-refine-the-condition-to-enable-sta.patch
%endif %endif
Patch9033: add-pthread_cond_clockwait-GLIBC_2_28.patch Patch9036: add-pthread_cond_clockwait-GLIBC_2_28.patch
Patch9034: 0001-ld.so-support-ld.so-mmap-hugetlb-hugepage-according-.patch Patch9037: 0001-ld.so-support-ld.so-mmap-hugetlb-hugepage-according-.patch
Patch9035: 0002-elf-ld.so-keep-compatible-with-the-original-policy-o.patch Patch9038: 0002-elf-ld.so-keep-compatible-with-the-original-policy-o.patch
Patch9036: 0003-elf-ld.so-remove-_mmap_hole-when-ld.so-mmap-PT_LOAD-.patch Patch9039: 0003-elf-ld.so-remove-_mmap_hole-when-ld.so-mmap-PT_LOAD-.patch
Patch9037: elf-ld.so-add-MAP_NORESERVE-flag-for-the-first-mmap-2MB-contig.patch Patch9030: elf-ld.so-add-MAP_NORESERVE-flag-for-the-first-mmap-2MB-contig.patch
Patch9038: elf-ld.so-prohibit-multiple-i-options-and-do-not-allow-i-speci.patch Patch9041: elf-ld.so-prohibit-multiple-i-options-and-do-not-allow-i-speci.patch
Patch9039: elf-ld.so-Consider-maybe-existing-hole-between-PT_LO.patch Patch9042: elf-ld.so-Consider-maybe-existing-hole-between-PT_LO.patch
Patch9040: add-GB18030-2022-charmap-BZ-30243.patch Patch9043: add-GB18030-2022-charmap-BZ-30243.patch
%if %{with noseparate_code} %if %{with noseparate_code}
Patch9041: add-Wl-z-noseparate-code-for-so.patch Patch9044: add-Wl-z-noseparate-code-for-so.patch
%endif %endif
Patch9042: display-declaration-fstat-function-make-fstat-call-t.patch Patch9045: display-declaration-fstat-function-make-fstat-call-t.patch
Provides: ldconfig rtld(GNU_HASH) bundled(gnulib) Provides: ldconfig rtld(GNU_HASH) bundled(gnulib)
@ -1487,6 +1490,9 @@ fi
%endif %endif
%changelog %changelog
* Fri Jul 28 2023 lixing <lixing@loongson.cn> - 2.34-128
- DESC: Add static PIE support for LoongArch
* Sun Jul 16 2023 Qingqing Li <liqingqing3@huawei.com> - 2.34-127 * Sun Jul 16 2023 Qingqing Li <liqingqing3@huawei.com> - 2.34-127
- time: Fix use-after-free in getdate - time: Fix use-after-free in getdate