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| author | Eugene Syromiatnikov <esyr@redhat.com> | 2020-04-12 22:31:23 +0200 |
|---|---|---|
| committer | Christian Brauner <christian.brauner@ubuntu.com> | 2020-04-15 09:56:25 +0200 |
| commit | 62173872ca65767c586217dec0a32485da8a2f07 (patch) | |
| tree | af488c4e93c0f2ce7d07b024ee946d2ea7cd3c30 /kernel | |
| parent | e82a118f57b89bbb437ce70780fc2678d5c281e5 (diff) | |
| download | lwn-62173872ca65767c586217dec0a32485da8a2f07.tar.gz lwn-62173872ca65767c586217dec0a32485da8a2f07.zip | |
clone3: add a check for the user struct size if CLONE_INTO_CGROUP is set
Passing CLONE_INTO_CGROUP with an under-sized structure (that doesn't
properly contain cgroup field) seems like garbage input, especially
considering the fact that fd 0 is a valid descriptor.
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20200412203123.GA5869@asgard.redhat.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/fork.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index b4f7775623c8..3ab7cf88e455 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2631,7 +2631,8 @@ 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 > INT_MAX) + if ((args.flags & CLONE_INTO_CGROUP) && + (args.cgroup > INT_MAX || usize < CLONE_ARGS_SIZE_VER2)) return -EINVAL; *kargs = (struct kernel_clone_args){ |