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Commit 9474f4e7 authored by Kees Cook's avatar Kees Cook Committed by James Morris
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Yama: Check for pid death before checking ancestry



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: default avatar <syzbot+a9ac39bf55329e206219@syzkaller.appspotmail.com>
Fixes: 2d514487 ("security: Yama LSM")
Cc: stable@vger.kernel.org
Suggested-by: default avatarOleg Nesterov <oleg@redhat.com>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarJames Morris <james.morris@microsoft.com>
parent a811dc61
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