https://github.com/torvalds/linux
Commit 84427eaef1fb91704c7112bdb598c810003b99f3 (remove task_ppid_nr_ns) moved the task_tgid_nr_ns(task->real_parent) outside of lock_task_sighand(). This is wrong, ->real_parent could be freed/reused. Both ->parent/real_parent point to nothing after __exit_signal() because we remove the child from ->children list, and thus the child can't be reparented when its parent exits. rcu_read_lock() protects ->parent/real_parent, but _only_ if we know it was valid before we take rcu lock. Revert this part of the patch. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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fix the "remove task_ppid_nr_ns" commit
File | Mode | Size |
---|---|---|
Kconfig | -rw-r--r-- | 6.9 KB |
Makefile | -rw-r--r-- | 270 bytes |
console.c | -rw-r--r-- | 1.1 KB |
disk.c | -rw-r--r-- | 16.7 KB |
main.c | -rw-r--r-- | 8.2 KB |
pm.c | -rw-r--r-- | 6.0 KB |
power.h | -rw-r--r-- | 6.9 KB |
poweroff.c | -rw-r--r-- | 905 bytes |
process.c | -rw-r--r-- | 6.3 KB |
snapshot.c | -rw-r--r-- | 49.9 KB |
swap.c | -rw-r--r-- | 14.6 KB |
swsusp.c | -rw-r--r-- | 7.7 KB |
user.c | -rw-r--r-- | 7.5 KB |
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