diff options
| author | Simon Schuster <schuster.simon@siemens-energy.com> | 2025-09-01 15:09:52 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-09-01 15:31:34 +0200 |
| commit | bbc46b23af5bb934cd1cf066ef4342cee457a24e (patch) | |
| tree | e32067d43d6a379e255e8be5e31587bdf16a10f3 /arch/x86/include/asm/shstk.h | |
| parent | edd3cb05c00a040dc72bed20b14b5ba865188bce (diff) | |
arch: copy_thread: pass clone_flags as u64
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 the copy_thread
function that is called from copy_process 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-v2-3-53fcf5577d57@siemens-energy.com
Fixes: c5febea0956fd387 ("fork: Pass struct kernel_clone_args into copy_thread")
Acked-by: Guo Ren (Alibaba Damo Academy) <guoren@kernel.org>
Acked-by: Andreas Larsson <andreas@gaisler.com> # sparc
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/shstk.h')
| -rw-r--r-- | arch/x86/include/asm/shstk.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/shstk.h b/arch/x86/include/asm/shstk.h index ba6f2fe43848..0f50e0125943 100644 --- a/arch/x86/include/asm/shstk.h +++ b/arch/x86/include/asm/shstk.h @@ -16,7 +16,7 @@ struct thread_shstk { long shstk_prctl(struct task_struct *task, int option, unsigned long arg2); void reset_thread_features(void); -unsigned long shstk_alloc_thread_stack(struct task_struct *p, unsigned long clone_flags, +unsigned long shstk_alloc_thread_stack(struct task_struct *p, u64 clone_flags, unsigned long stack_size); void shstk_free(struct task_struct *p); int setup_signal_shadow_stack(struct ksignal *ksig); @@ -28,7 +28,7 @@ static inline long shstk_prctl(struct task_struct *task, int option, unsigned long arg2) { return -EINVAL; } static inline void reset_thread_features(void) {} static inline unsigned long shstk_alloc_thread_stack(struct task_struct *p, - unsigned long clone_flags, + u64 clone_flags, unsigned long stack_size) { return 0; } static inline void shstk_free(struct task_struct *p) {} static inline int setup_signal_shadow_stack(struct ksignal *ksig) { return 0; } |