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| author | [email protected] <[email protected]> | 2020-08-28 12:37:20 +0000 |
|---|---|---|
| committer | Peter Zijlstra <[email protected]> | 2020-12-09 16:08:57 +0000 |
| commit | 78af4dc949daaa37b3fcd5f348f373085b4e858f (patch) | |
| tree | fc680c63d7cb4156603b7896d963ac2b272012f1 /scripts/gcc-plugins/structleak_plugin.c | |
| parent | sparc64/mm: Implement pXX_leaf_size() support (diff) | |
| download | kernel-78af4dc949daaa37b3fcd5f348f373085b4e858f.tar.gz kernel-78af4dc949daaa37b3fcd5f348f373085b4e858f.zip | |
perf: Break deadlock involving exec_update_mutex
Syzbot reported a lock inversion involving perf. The sore point being
perf holding exec_update_mutex() for a very long time, specifically
across a whole bunch of filesystem ops in pmu::event_init() (uprobes)
and anon_inode_getfile().
This then inverts against procfs code trying to take
exec_update_mutex.
Move the permission checks later, such that we need to hold the mutex
over less code.
Reported-by: [email protected]
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Diffstat (limited to 'scripts/gcc-plugins/structleak_plugin.c')
0 files changed, 0 insertions, 0 deletions