Revision 7ff57e98fb78ad94edafbdc7435f2d745e9e6bb5 authored by Fabio M. De Francesco on 23 February 2022, 10:02:52 UTC, committed by Jakub Kicinski on 24 February 2022, 17:09:33 UTC
smc_pnetid_by_table_ib() uses read_lock() and then it calls smc_pnet_apply_ib()
which, in turn, calls mutex_lock(&smc_ib_devices.mutex).
read_lock() disables preemption. Therefore, the code acquires a mutex while in
atomic context and it leads to a SAC bug.
Fix this bug by replacing the rwlock with a mutex.
Reported-and-tested-by: syzbot+4f322a6d84e991c38775@syzkaller.appspotmail.com
Fixes: 64e28b52c7a6 ("net/smc: add pnet table namespace support")
Confirmed-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Link: https://lore.kernel.org/r/20220223100252.22562-1-fmdefrancesco@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1 parent e13ad14
| File | Mode | Size |
|---|---|---|
| test | ||
| .gitignore | -rw-r--r-- | 106 bytes |
| Makefile | -rw-r--r-- | 3.3 KB |
| algos.c | -rw-r--r-- | 6.2 KB |
| altivec.uc | -rw-r--r-- | 3.3 KB |
| avx2.c | -rw-r--r-- | 16.9 KB |
| avx512.c | -rw-r--r-- | 17.8 KB |
| int.uc | -rw-r--r-- | 3.7 KB |
| mktables.c | -rw-r--r-- | 3.9 KB |
| mmx.c | -rw-r--r-- | 3.6 KB |
| neon.c | -rw-r--r-- | 2.0 KB |
| neon.uc | -rw-r--r-- | 3.8 KB |
| recov.c | -rw-r--r-- | 3.3 KB |
| recov_avx2.c | -rw-r--r-- | 8.8 KB |
| recov_avx512.c | -rw-r--r-- | 9.4 KB |
| recov_neon.c | -rw-r--r-- | 2.6 KB |
| recov_neon_inner.c | -rw-r--r-- | 2.3 KB |
| recov_s390xc.c | -rw-r--r-- | 2.7 KB |
| recov_ssse3.c | -rw-r--r-- | 9.0 KB |
| s390vx.uc | -rw-r--r-- | 3.8 KB |
| sse1.c | -rw-r--r-- | 4.6 KB |
| sse2.c | -rw-r--r-- | 15.8 KB |
| unroll.awk | -rw-r--r-- | 423 bytes |
| vpermxor.uc | -rw-r--r-- | 2.7 KB |
| x86.h | -rw-r--r-- | 2.1 KB |
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