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authorEugene Syromiatnikov <esyr@redhat.com>2020-04-12 22:25:33 +0200
committerChristian Brauner <christian.brauner@ubuntu.com>2020-04-15 09:56:12 +0200
commite82a118f57b89bbb437ce70780fc2678d5c281e5 (patch)
tree1006900d63cfcd7598798ee09a1445bfb3a30ddf /kernel
parent3075afdf15b89a063f8d31c0db08a50472bb7faf (diff)
clone3: fix cgroup argument sanity check
Checking that cgroup field value of struct clone_args is less than 0 is useless, as it is defined as unsigned 64-bit integer. Moreover, it doesn't catch the situations where its higher bits are lost during the assignment to the cgroup field of the cgroup field of the internal struct kernel_clone_args (where it is declared as signed 32-bit integer), so it is still possible to pass garbage there. A check against INT_MAX solves both these issues. Fixes: ef2c41cf38a7559b ("clone3: allow spawning processes into cgroups") Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Link: https://lore.kernel.org/r/20200412202533.GA29554@asgard.redhat.com Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 4385f3d639f2..b4f7775623c8 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2631,7 +2631,7 @@ noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs,
!valid_signal(args.exit_signal)))
return -EINVAL;
- if ((args.flags & CLONE_INTO_CGROUP) && args.cgroup < 0)
+ if ((args.flags & CLONE_INTO_CGROUP) && args.cgroup > INT_MAX)
return -EINVAL;
*kargs = (struct kernel_clone_args){