copy_process: pass clone_flags as u64 across calltree

With the introduction of clone3 in commit 7f192e3cd316 ("fork: add
clone3") the effective bit width of clone_flags on all architectures was
increased from 32-bit to 64-bit, with a new type of u64 for the flags.
However, for most consumers of clone_flags the interface was not
changed from the previous type of unsigned long.

While this works fine as long as none of the new 64-bit flag bits
(CLONE_CLEAR_SIGHAND and CLONE_INTO_CGROUP) are evaluated, this is still
undesirable in terms of the principle of least surprise.

Thus, this commit fixes all relevant interfaces of callees to
sys_clone3/copy_process (excluding the architecture-specific
copy_thread) to consistently pass clone_flags as u64, so that
no truncation to 32-bit integers occurs on 32-bit architectures.

Signed-off-by: Simon Schuster <[email protected]>
Link: https://lore.kernel.org/20250901-nios2-implement-clone3-v2-2-53fcf5577d57@siemens-energy.com
Acked-by: David Hildenbrand <[email protected]>
Reviewed-by: Lorenzo Stoakes <[email protected]>
Reviewed-by: Arnd Bergmann <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 1b6f3826dd0e..8ec9d83475bf 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -539,7 +539,7 @@ void net_drop_ns(void *p)
 		net_passive_dec(net);
 }
 
-struct net *copy_net_ns(unsigned long flags,
+struct net *copy_net_ns(u64 flags,
 			struct user_namespace *user_ns, struct net *old_net)
 {
 	struct ucounts *ucounts;