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>
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File | Mode | Size |
---|---|---|
Kconfig | -rw-r--r-- | 3.6 KB |
Makefile | -rw-r--r-- | 585 bytes |
l2tp_core.c | -rw-r--r-- | 44.7 KB |
l2tp_core.h | -rw-r--r-- | 11.1 KB |
l2tp_debugfs.c | -rw-r--r-- | 9.0 KB |
l2tp_eth.c | -rw-r--r-- | 8.4 KB |
l2tp_ip.c | -rw-r--r-- | 15.7 KB |
l2tp_ip6.c | -rw-r--r-- | 19.2 KB |
l2tp_netlink.c | -rw-r--r-- | 27.0 KB |
l2tp_ppp.c | -rw-r--r-- | 42.4 KB |
trace.h | -rw-r--r-- | 5.3 KB |
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