https://github.com/torvalds/linux
The race was introduced by me in commit 971316f0503a ("epoll: ep_unregister_pollwait() can use the freed pwq->whead"). I did not realize that nothing can protect eventpoll after ep_poll_callback() sets ->whead = NULL, only whead->lock can save us from the race with ep_free() or ep_remove(). Move ->whead = NULL to the end of ep_poll_callback() and add the necessary barriers. TODO: cleanup the ewake/EPOLLEXCLUSIVE logic, it was confusing even before this patch. Hopefully this explains use-after-free reported by syzcaller: BUG: KASAN: use-after-free in debug_spin_lock_before ... _raw_spin_lock_irqsave+0x4a/0x60 kernel/locking/spinlock.c:159 ep_poll_callback+0x29f/0xff0 fs/eventpoll.c:1148 this is spin_lock(eventpoll->lock), ... Freed by task 17774: ... kfree+0xe8/0x2c0 mm/slub.c:3883 ep_free+0x22c/0x2a0 fs/eventpoll.c:865 Fixes: 971316f0503a ("epoll: ep_unregister_pollwait() can use the freed pwq->whead") Reported-by: 范龙飞 <long7573@126.com> Cc: stable@vger.kernel.org Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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- v2.6.20-rc1
- v2.6.20
- v2.6.19-rc6
- v2.6.19-rc5
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- v2.6.19
- v2.6.18-rc7
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- v2.6.18-rc5
- v2.6.18-rc4
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- v2.6.18-rc1
- v2.6.18
- v2.6.17-rc6
- v2.6.17-rc5
- v2.6.17-rc4
- v2.6.17-rc3
- v2.6.17-rc2
- v2.6.17-rc1
- v2.6.17
- v2.6.16-rc6
- v2.6.16-rc5
- v2.6.16-rc4
- v2.6.16-rc3
- v2.6.16-rc2
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- v2.6.16
- v2.6.15-rc7
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- v2.6.15-rc5
- v2.6.15-rc4
- v2.6.15-rc3
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- v2.6.15
- v2.6.14-rc5
- v2.6.14-rc4
- v2.6.14-rc3
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- v2.6.14
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- v2.6.13
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- v2.6.12-rc4
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- v2.6.12-rc2
- v2.6.12
- v2.6.11-tree
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epoll: fix race between ep_poll_callback(POLLFREE) and ep_free()/ep_remove()
File | Mode | Size |
---|---|---|
Kconfig | -rw-r--r-- | 1.3 KB |
Makefile | -rw-r--r-- | 308 bytes |
core.c | -rw-r--r-- | 30.1 KB |
pblk-cache.c | -rw-r--r-- | 3.1 KB |
pblk-core.c | -rw-r--r-- | 45.5 KB |
pblk-gc.c | -rw-r--r-- | 14.5 KB |
pblk-init.c | -rw-r--r-- | 26.2 KB |
pblk-map.c | -rw-r--r-- | 4.9 KB |
pblk-rb.c | -rw-r--r-- | 21.4 KB |
pblk-read.c | -rw-r--r-- | 13.4 KB |
pblk-recovery.c | -rw-r--r-- | 25.9 KB |
pblk-rl.c | -rw-r--r-- | 5.7 KB |
pblk-sysfs.c | -rw-r--r-- | 13.3 KB |
pblk-write.c | -rw-r--r-- | 15.7 KB |
pblk.h | -rw-r--r-- | 35.6 KB |
rrpc.c | -rw-r--r-- | 37.1 KB |
rrpc.h | -rw-r--r-- | 6.9 KB |
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