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 |
|---|---|---|
| coresight | ||
| postprocess | ||
| boottime-trace.rst | -rw-r--r-- | 10.2 KB |
| events-kmem.rst | -rw-r--r-- | 5.4 KB |
| events-msr.rst | -rw-r--r-- | 783 bytes |
| events-nmi.rst | -rw-r--r-- | 1.6 KB |
| events-power.rst | -rw-r--r-- | 3.4 KB |
| events.rst | -rw-r--r-- | 39.8 KB |
| ftrace-design.rst | -rw-r--r-- | 14.7 KB |
| ftrace-uses.rst | -rw-r--r-- | 11.9 KB |
| ftrace.rst | -rw-r--r-- | 130.4 KB |
| function-graph-fold.vim | -rw-r--r-- | 1.3 KB |
| histogram-design.rst | -rw-r--r-- | 87.1 KB |
| histogram.rst | -rw-r--r-- | 153.6 KB |
| hwlat_detector.rst | -rw-r--r-- | 4.0 KB |
| index.rst | -rw-r--r-- | 491 bytes |
| intel_th.rst | -rw-r--r-- | 6.0 KB |
| kprobes.rst | -rw-r--r-- | 29.6 KB |
| kprobetrace.rst | -rw-r--r-- | 10.9 KB |
| mmiotrace.rst | -rw-r--r-- | 6.8 KB |
| osnoise-tracer.rst | -rw-r--r-- | 8.3 KB |
| ring-buffer-design.rst | -rw-r--r-- | 30.6 KB |
| stm.rst | -rw-r--r-- | 6.6 KB |
| sys-t.rst | -rw-r--r-- | 2.1 KB |
| timerlat-tracer.rst | -rw-r--r-- | 8.6 KB |
| tracepoint-analysis.rst | -rw-r--r-- | 12.1 KB |
| tracepoints.rst | -rw-r--r-- | 6.0 KB |
| uprobetracer.rst | -rw-r--r-- | 7.2 KB |
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