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The first thread will return okay, but then the second thread will wake up holding the user_mutex and, if it sees that the call has been released by the first thread, it will BUG thusly: kernel BUG at net/rxrpc/recvmsg
from the top result below
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.266
However, there exists a race window where this check can be bypassed: ring_buffer_lock_reserve cpu_buffer = buffer->buffers[cpu]; // cpu_buffer_a rb_reserve_next_event rb_start_commit // inc committing if (unlikely(READ_ONCE(cpu_buffer->buffer)
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.265
With an authenticated peer, the reproducer triggered the same KASAN report in 2 of 2 unpatched runs on a KASAN-enabled netdev/main kernel: BUG: KASAN: slab-use-after-free in sctp_outq_select_transport Read of size 4 at addr ffff88800b9bd95c by task python3/197 Call Trace: sctp_outq_select_transport+0x549/0x8b0 [sctp]
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.216
With an authenticated peer, the reproducer triggered the same KASAN report in 2 of 2 unpatched runs on a KASAN-enabled netdev/main kernel: BUG: KASAN: slab-use-after-free in sctp_outq_select_transport Read of size 4 at addr ffff88800b9bd95c by task python3/197 Call Trace: sctp_outq_select_transport+0x549/0x8b0 [sctp]
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.50
com Fixes: 5d2146a3354f ("selftests/mm: skip mlock tests if nobody user can't read it") Signed-off-by: Injae Ryou Cc: Brendan Jackman Cc: B
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.183
With an authenticated peer, the reproducer triggered the same KASAN report in 2 of 2 unpatched runs on a KASAN-enabled netdev/main kernel: BUG: KASAN: slab-use-after-free in sctp_outq_select_transport Read of size 4 at addr ffff88800b9bd95c by task python3/197 Call Trace: sctp_outq_select_transport+0x549/0x8b0 [sctp]
https://cdn.kernel.org/pub/linux/kernel/v7.x/ChangeLog-7.2.6
org Tested-by: Brett A C Sheffield Tested-by: Salvatore Bonaccorso Tested-by: Ronald Warsow Tested-by: Takeshi Ogasawara Tested-by: Peter Schneider Tested-by: Benjamin Boortz Tested-by: Markus Reichelt Tested-by: Barry K
https://cdn.kernel.org/pub/linux/kernel/v7.x/patch-7.2.6.xz
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https://cdn.kernel.org/pub/linux/kernel/v6.x/patch-6.1.184.xz
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https://cdn.kernel.org/pub/linux/kernel/v6.x/patch-6.1.186.xz
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https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.18.50.tar.xz
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https://cdn.kernel.org/pub/linux/kernel/v6.x/patch-6.12.105.xz
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https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.42
If the work is already running, mark it cancelled and let the worker own the cleanup; otherwise tcm_disable() can cancel the queued work and clean up immediately
https://cdn.kernel.org/pub/linux/kernel/v7.x/ChangeLog-7.1.6
This missed the case where background I/O holds the final reference after userspace close() returns, and required explicit maintenance at each close-path site
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.18.45
With an authenticated peer, the reproducer triggered the same KASAN report in 2 of 2 unpatched runs on a KASAN-enabled netdev/main kernel: BUG: KASAN: slab-use-after-free in sctp_outq_select_transport Read of size 4 at addr ffff88800b9bd95c by task python3/197 Call Trace: sctp_outq_select_transport+0x549/0x8b0 [sctp]
https://cdn.kernel.org/pub/linux/kernel/v7.x/ChangeLog-7.1.9
With an authenticated peer, the reproducer triggered the same KASAN report in 2 of 2 unpatched runs on a KASAN-enabled netdev/main kernel: BUG: KASAN: slab-use-after-free in sctp_outq_select_transport Read of size 4 at addr ffff88800b9bd95c by task python3/197 Call Trace: sctp_outq_select_transport+0x549/0x8b0 [sctp]
https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.6.150.tar.xz
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https://cdn.kernel.org/pub/linux/kernel/v6.x/incr/patch-6.12.104-105.xz
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https://cdn.kernel.org/pub/linux/kernel/v7.x/patch-7.2.4.xz
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