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| author | Stephen Smalley <sds@tycho.nsa.gov> | 2017-01-10 12:28:32 -0500 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2017-01-12 11:10:57 -0500 |
| commit | 3a2f5a59a695a73e0cde9a61e0feae5fa730e936 (patch) | |
| tree | 058704d18e909a2c0b46356c74d3c1156c2206aa /include/linux/lsm_hooks.h | |
| parent | b4ba35c75a0671a06b978b6386b54148efddf39f (diff) | |
| download | lwn-3a2f5a59a695a73e0cde9a61e0feae5fa730e936.tar.gz lwn-3a2f5a59a695a73e0cde9a61e0feae5fa730e936.zip | |
security,selinux,smack: kill security_task_wait hook
As reported by yangshukui, a permission denial from security_task_wait()
can lead to a soft lockup in zap_pid_ns_processes() since it only expects
sys_wait4() to return 0 or -ECHILD. Further, security_task_wait() can
in general lead to zombies; in the absence of some way to automatically
reparent a child process upon a denial, the hook is not useful. Remove
the security hook and its implementations in SELinux and Smack. Smack
already removed its check from its hook.
Reported-by: yangshukui <yangshukui@huawei.com>
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'include/linux/lsm_hooks.h')
| -rw-r--r-- | include/linux/lsm_hooks.h | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index 0dde95900196..6fe7a5cb0be1 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -666,11 +666,6 @@ * @sig contains the signal value. * @secid contains the sid of the process where the signal originated * Return 0 if permission is granted. - * @task_wait: - * Check permission before allowing a process to reap a child process @p - * and collect its status information. - * @p contains the task_struct for process. - * Return 0 if permission is granted. * @task_prctl: * Check permission before performing a process control operation on the * current process. @@ -1507,7 +1502,6 @@ union security_list_options { int (*task_movememory)(struct task_struct *p); int (*task_kill)(struct task_struct *p, struct siginfo *info, int sig, u32 secid); - int (*task_wait)(struct task_struct *p); int (*task_prctl)(int option, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5); void (*task_to_inode)(struct task_struct *p, struct inode *inode); @@ -1767,7 +1761,6 @@ struct security_hook_heads { struct list_head task_getscheduler; struct list_head task_movememory; struct list_head task_kill; - struct list_head task_wait; struct list_head task_prctl; struct list_head task_to_inode; struct list_head ipc_permission; |