9803c6ed12
- hw/virtio/virtio-crypto: Protect from DMA re-entrancy bugs(CVE-2024-3446) - hw/char/virtio-serial-bus: Protect from DMA re-entrancy bugs(CVE-2024-3446) - hw/display/virtio-gpu: Protect from DMA re-entrancy bugs(CVE-2024-3446) - hw/virtio: Introduce virtio_bh_new_guarded() helper - hw: replace most qemu_bh_new calls with qemu_bh_new_guarded - checkpatch: add qemu_bh_new/aio_bh_new checks - async: avoid use-after-free on re-entrancy guard - async: Add an optional reentrancy guard to the BH API - hw/sd/sdhci: Do not update TRNMOD when Command Inhibit (DAT) is set(CVE-2024-3447) - rtl8139: Remove unused variable - tulip: Remove unused variable - virtio-mem: Fix the bitmap index of the section offset - virtio-mem: Fix the iterator variable in a vmem->rdl_list loop - system/memory: use ldn_he_p/stn_he_p - block: Fix crash when loading snapshot on inactive node - smmu: Clear SMMUPciBus pointer cache when system reset - block/mirror: Fix NULL s->job in active writes - amd_iommu: Fix APIC address check - virtio-crypto: fix NULL pointer dereference in virtio_crypto_free_reques - libqos/virtio.c: Correct 'flags' reading in qvirtqueue_kick cherry-pick from 66e411885a23c96ff73742d06b793fec3ceaebb7 - ivshmem-test.c: enable test_ivshmem_server for ppc64 arch - ivshmem.c: change endianness to LITTLE_ENDIAN - hw/ppc/mac.h: Remove MAX_CPUS macro - configure: remove dead variables - virtio-gpu: do not byteswap padding - hw/intc: clean-up error reporting for failed ITS cmd - qemu-iotests: Discard stderr when probing devices - linux-user: un-parent OBJECT(cpu) when closing thread - hw/net/rocker: Avoid undefined shifts with more than 31 ports - contrib/vhost-user-blk: Clean up deallocation of VuVirtqElement - scsi-disk: fix overflow when block size is not a multiple of BDRV_SECTOR_SIZE Signed-off-by: Jiabo Feng <fengjiabo1@huawei.com> (cherry picked from commit bf54b48c2963c869dfdc89977c57be4bd9e772aa)
53 lines
1.8 KiB
Diff
53 lines
1.8 KiB
Diff
From b2b00599451de0c9fe4dcdf7c47fb1d585ab7d23 Mon Sep 17 00:00:00 2001
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From: Alexander Bulekov <alxndr@bu.edu>
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Date: Mon, 1 May 2023 10:19:56 -0400
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Subject: [PATCH] async: avoid use-after-free on re-entrancy guard
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A BH callback can free the BH, causing a use-after-free in aio_bh_call.
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Fix that by keeping a local copy of the re-entrancy guard pointer.
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Buglink: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=58513
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Fixes: 9c86c97f12 ("async: Add an optional reentrancy guard to the BH API")
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Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
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Message-Id: <20230501141956.3444868-1-alxndr@bu.edu>
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Reviewed-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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---
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util/async.c | 14 ++++++++------
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1 file changed, 8 insertions(+), 6 deletions(-)
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diff --git a/util/async.c b/util/async.c
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index 3eb6b50163..760ad73404 100644
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--- a/util/async.c
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+++ b/util/async.c
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@@ -142,18 +142,20 @@ void aio_bh_call(QEMUBH *bh)
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{
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bool last_engaged_in_io = false;
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- if (bh->reentrancy_guard) {
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- last_engaged_in_io = bh->reentrancy_guard->engaged_in_io;
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- if (bh->reentrancy_guard->engaged_in_io) {
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+ /* Make a copy of the guard-pointer as cb may free the bh */
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+ MemReentrancyGuard *reentrancy_guard = bh->reentrancy_guard;
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+ if (reentrancy_guard) {
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+ last_engaged_in_io = reentrancy_guard->engaged_in_io;
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+ if (reentrancy_guard->engaged_in_io) {
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trace_reentrant_aio(bh->ctx, bh->name);
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}
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- bh->reentrancy_guard->engaged_in_io = true;
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+ reentrancy_guard->engaged_in_io = true;
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}
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bh->cb(bh->opaque);
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- if (bh->reentrancy_guard) {
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- bh->reentrancy_guard->engaged_in_io = last_engaged_in_io;
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+ if (reentrancy_guard) {
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+ reentrancy_guard->engaged_in_io = last_engaged_in_io;
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}
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}
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--
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2.27.0
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