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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-04-30 00:54:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:49 -0700 |
| commit | 12a3de0a965826096d8adc593bcf4392a7d5b459 (patch) | |
| tree | 764d69c2973e67cb3ae58bec02e29cd616c40f90 /drivers/char | |
| parent | 1dd768c0815334d2319d6377f0750ace075b6142 (diff) | |
| download | linux-12a3de0a965826096d8adc593bcf4392a7d5b459.tar.gz linux-12a3de0a965826096d8adc593bcf4392a7d5b459.tar.bz2 linux-12a3de0a965826096d8adc593bcf4392a7d5b459.zip | |
pids: sys_getpgid: fix unsafe *pid usage, s/tasklist/rcu/
1. sys_getpgid() needs rcu_read_lock() to derive the pgrp _nr, even if
the task is current, otherwise we can race with another thread which
does sys_setpgid().
2. Use rcu_read_lock() instead of tasklist_lock when pid != 0, make sure
that we don't use the NULL pid if the task exits right after successful
find_task_by_vpid().
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char')
0 files changed, 0 insertions, 0 deletions