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| author | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-05-31 16:26:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-31 17:49:30 -0700 |
| commit | 9bd0a077122a6b15069aab7a59c8f50f736fa1dd (patch) | |
| tree | f76eefc0b3bdb46a01e394cecbf9ac42935bc4cc | |
| parent | af1be5a578a1ccc9961c55290f8c509a00a69036 (diff) | |
| download | linux-9bd0a077122a6b15069aab7a59c8f50f736fa1dd.tar.bz2 | |
um: should hold tasklist_lock while traversing processes
Traversing the tasks requires holding tasklist_lock, otherwise it is
unsafe.
p.s. However, I'm not sure that calling os_kill_ptraced_process() in the
atomic context is correct. It seem to work, but please take a closer
look.
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>
| -rw-r--r-- | arch/um/kernel/reboot.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/um/kernel/reboot.c b/arch/um/kernel/reboot.c index 4d93dff6b371..66d754c46e7b 100644 --- a/arch/um/kernel/reboot.c +++ b/arch/um/kernel/reboot.c @@ -4,6 +4,7 @@ */ #include "linux/sched.h" +#include "linux/spinlock.h" #include "linux/slab.h" #include "kern_util.h" #include "os.h" @@ -22,6 +23,7 @@ static void kill_off_processes(void) struct task_struct *p; int pid; + read_lock(&tasklist_lock); for_each_process(p) { if (p->mm == NULL) continue; @@ -29,6 +31,7 @@ static void kill_off_processes(void) pid = p->mm->context.id.u.pid; os_kill_ptraced_process(pid, 1); } + read_unlock(&tasklist_lock); } } |