diff options
| author | Kees Cook <keescook@chromium.org> | 2019-01-16 10:31:09 -0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2019-05-02 21:41:23 +0100 |
| commit | 0c8a56a6fa056db65e66873a1b597c51559049b2 (patch) | |
| tree | eda4a9de0c0504f2e47c662ad06ab2ccdfafd176 /security | |
| parent | 32ef76c716e5b45bc4207ce24e78dfe146226af3 (diff) | |
Yama: Check for pid death before checking ancestry
commit 9474f4e7cd71a633fa1ef93b7daefd44bbdfd482 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: 2d514487faf1 ("security: Yama LSM")
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: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'security')
| -rw-r--r-- | security/yama/yama_lsm.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c index 0038834b558e..6da531603614 100644 --- a/security/yama/yama_lsm.c +++ b/security/yama/yama_lsm.c @@ -299,7 +299,9 @@ int yama_ptrace_access_check(struct task_struct *child, break; case YAMA_SCOPE_RELATIONAL: rcu_read_lock(); - if (!task_is_descendant(current, child) && + if (!pid_alive(child)) + rc = -EPERM; + if (!rc && !task_is_descendant(current, child) && !ptracer_exception_found(current, child) && !ns_capable(__task_cred(child)->user_ns, CAP_SYS_PTRACE)) rc = -EPERM; |