From: Tobias Klauser tklauser@distanz.ch
commit a402f1e35313fc7ce2ca60f543c4402c2c7c3544 upstream.
Currently, calling clone3() with CLONE_NEWTIME in clone_args->flags fails with -EINVAL. This is because CLONE_NEWTIME intersects with CSIGNAL. However, CSIGNAL was deprecated when clone3 was introduced in commit 7f192e3cd316 ("fork: add clone3"), allowing re-use of that part of clone flags.
Fix this by explicitly allowing CLONE_NEWTIME in clone3_args_valid. This is also in line with the respective check in check_unshare_flags which allow CLONE_NEWTIME for unshare().
Fixes: 769071ac9f20 ("ns: Introduce Time Namespace") Cc: Andrey Vagin avagin@openvz.org Cc: Christian Brauner brauner@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Tobias Klauser tklauser@distanz.ch Reviewed-by: Christian Brauner brauner@kernel.org Signed-off-by: Christian Brauner (Microsoft) brauner@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/fork.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/fork.c +++ b/kernel/fork.c @@ -2829,7 +2829,7 @@ static bool clone3_args_valid(struct ker * - make the CLONE_DETACHED bit reusable for clone3 * - make the CSIGNAL bits reusable for clone3 */ - if (kargs->flags & (CLONE_DETACHED | CSIGNAL)) + if (kargs->flags & (CLONE_DETACHED | (CSIGNAL & (~CLONE_NEWTIME)))) return false;
if ((kargs->flags & (CLONE_SIGHAND | CLONE_CLEAR_SIGHAND)) ==