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 |
|---|---|---|
| Kconfig | -rw-r--r-- | 1.5 KB |
| Makefile | -rw-r--r-- | 409 bytes |
| caif_dev.c | -rw-r--r-- | 13.1 KB |
| caif_socket.c | -rw-r--r-- | 26.5 KB |
| caif_usb.c | -rw-r--r-- | 5.3 KB |
| cfcnfg.c | -rw-r--r-- | 14.2 KB |
| cfctrl.c | -rw-r--r-- | 15.7 KB |
| cfdbgl.c | -rw-r--r-- | 1.5 KB |
| cfdgml.c | -rw-r--r-- | 2.8 KB |
| cffrml.c | -rw-r--r-- | 4.5 KB |
| cfmuxl.c | -rw-r--r-- | 6.2 KB |
| cfpkt_skbuff.c | -rw-r--r-- | 8.1 KB |
| cfrfml.c | -rw-r--r-- | 6.3 KB |
| cfserl.c | -rw-r--r-- | 4.3 KB |
| cfsrvl.c | -rw-r--r-- | 5.4 KB |
| cfutill.c | -rw-r--r-- | 2.8 KB |
| cfveil.c | -rw-r--r-- | 2.5 KB |
| cfvidl.c | -rw-r--r-- | 1.7 KB |
| chnl_net.c | -rw-r--r-- | 12.8 KB |
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