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sched: move no_new_privs into new atomic flags

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Since seccomp transitions between threads requires updates to the
no_new_privs flag to be atomic, the flag must be part of an atomic flag
set. This moves the nnp flag into a separate task field, and introduces
accessors.

Signed-off-by: Kees Cook <[email protected]>
Reviewed-by: Oleg Nesterov <[email protected]>
Reviewed-by: Andy Lutomirski <[email protected]>
This commit is contained in:
Kees Cook 2014-05-21 15:23:46 -07:00
commit 1d4457f999
5 changed files with 22 additions and 10 deletions
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2
kernel/seccomp.c
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@ -241,7 +241,7 @@ static long seccomp_attach_filter(struct sock_fprog *fprog)
* This avoids scenarios where unprivileged tasks can affect the
* behavior of privileged children.
*/
if (!current->no_new_privs &&
if (!task_no_new_privs(current) &&
security_capable_noaudit(current_cred(), current_user_ns(),
CAP_SYS_ADMIN) != 0)
return -EACCES;