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fork: allow CLONE_NEWTIME in clone3 flags

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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>
This commit is contained in:
Tobias Klauser 2023-03-08 11:51:26 +01:00 committed by Greg Kroah-Hartman
parent a759905de9
commit a1eb8bf1e3
1 changed files with 1 additions and 1 deletions
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kernel/fork.c
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@ -2726,7 +2726,7 @@ static bool clone3_args_valid(struct kernel_clone_args *kargs)
* - make the CLONE_DETACHED bit reuseable for clone3
* - make the CSIGNAL bits reuseable 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)) ==