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clone3: switch to copy_struct_from_user()

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Switch clone3() syscall from it's own copying struct clone_args from
userspace to the new dedicated copy_struct_from_user() helper.

The change is very straightforward, and helps unify the syscall
interface for struct-from-userspace syscalls. Additionally, explicitly
define CLONE_ARGS_SIZE_VER0 to match the other users of the
struct-extension pattern.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com>
[christian.brauner@ubuntu.com: improve commit message]
Link: https://lore.kernel.org/r/20191001011055.19283-3-cyphar@cyphar.com
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Aleksa Sarai 2019-10-01 11:10:53 +10:00 • committed by Christian Brauner
parent f5a1a536fa
commit f14c234b4b
2 changed files with 9 additions and 27 deletions
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2
include/uapi/linux/sched.h
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@ -47,6 +47,8 @@ struct clone_args {
__aligned_u64 tls;
};
#define CLONE_ARGS_SIZE_VER0 64 /* sizeof first published struct */
/*
* Scheduling policies
*/