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| author |   Simon Schuster <schuster.simon@siemens-energy.com> | 2025-09-01 15:09:51 +0200 |
|---|---|---|
| committer |   Christian Brauner <brauner@kernel.org> | 2025-09-01 15:31:34 +0200 |
| commit | edd3cb05c00a040dc72bed20b14b5ba865188bce (patch) | |
| tree | 4af926aeb6d32e2d5aafc3c3f71678c766eb6fd4 /kernel/sched/core.c | |
| parent | copy_sighand: Handle architectures where sizeof(unsigned long) < sizeof(u64) (diff) | |
| download | wireguard-linux-edd3cb05c00a040dc72bed20b14b5ba865188bce.tar.xz wireguard-linux-edd3cb05c00a040dc72bed20b14b5ba865188bce.zip | |
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 <schuster.simon@siemens-energy.com>
Link: https://lore.kernel.org/20250901-nios2-implement-clone3-v2-2-53fcf5577d57@siemens-energy.com
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index be00629f0ba4..6fa85d30d965 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4472,7 +4472,7 @@ int wake_up_state(struct task_struct *p, unsigned int state) * __sched_fork() is basic setup which is also used by sched_init() to * initialize the boot CPU's idle task. */ -static void __sched_fork(unsigned long clone_flags, struct task_struct *p) +static void __sched_fork(u64 clone_flags, struct task_struct *p) { p->on_rq = 0; @@ -4707,7 +4707,7 @@ late_initcall(sched_core_sysctl_init); /* * fork()/clone()-time setup: */ -int sched_fork(unsigned long clone_flags, struct task_struct *p) +int sched_fork(u64 clone_flags, struct task_struct *p) { __sched_fork(clone_flags, p); /* |