Yama: Check for pid death before checking ancestry

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commit 9474f4e7cd upstream.

It's possible that a pid has died before we take the rcu lock, in which
case we can't walk the ancestry list as it may be detached. Instead, check
for death first before doing the walk.

Reported-by: syzbot+a9ac39bf55329e206219@syzkaller.appspotmail.com
Fixes: 2d514487fa ("security: Yama LSM")
Cc: stable@vger.kernel.org
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.morris@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Kees Cook 2019-01-16 10:31:09 -08:00 • committed by Greg Kroah-Hartman

parent 51f39f27a1

commit a49be9dcb1

1 changed files with 3 additions and 1 deletions

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security/yama/yama_lsm.c

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