prctl: exe link permission error changed from -EINVAL to -EPERM

This brings consistency with the rest of the prctl() syscall where
-EPERM is returned when failing a capability check.

Signed-off-by: Nicolas Viennot <[email protected]>
Signed-off-by: Adrian Reber <[email protected]>
Reviewed-by: Serge Hallyn <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>

Author: nviennot

kernel/sys.c

@@ -2015,7 +2015,7 @@ static int prctl_set_mm_map(int opt, const void __user *addr, unsigned long data
 		 * This may have implications in the tomoyo subsystem.
 		 */
 		if (!checkpoint_restore_ns_capable(current_user_ns()))
-			return -EINVAL;
+			return -EPERM;
 
 		error = prctl_set_mm_exe_file(mm, prctl_map.exe_fd);
 		if (error)