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| author | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-06-01 01:26:25 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-06-01 02:49:30 +0200 |
| commit | 137d1a26c842a384c98dd2a6a605014fddf5c777 (patch) | |
| tree | 615db05121d00f246e1aa5b461f173c54c5391dd /Documentation/driver-model | |
| parent | um: should hold tasklist_lock while traversing processes (diff) | |
| download | linux-137d1a26c842a384c98dd2a6a605014fddf5c777.tar.xz linux-137d1a26c842a384c98dd2a6a605014fddf5c777.zip | |
um: fix possible race on task->mm
Checking for task->mm is dangerous as ->mm might disappear (exit_mm()
assigns NULL under task_lock(), so tasklist lock is not enough).
We can't use get_task_mm()/mmput() pair as mmput() might sleep, so let's
take the task lock while we care about its mm.
Note that we should also use find_lock_task_mm() to check all process'
threads for a valid mm, but for uml we'll do it in a separate patch.
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/driver-model')
0 files changed, 0 insertions, 0 deletions