Re: [patch 08/18] x86/syscall: Use [syscall_]enter_from_user_mode_randomize_stack()

Philippe Mathieu-Daudé <[email protected]> Thu, 9 Jul 2026 13:18:04 +0200

Newsgroups	gmane.linux.ports.sh.devel,gmane.linux.kernel,gmane.linux.ports.ppc64.devel,gmane.linux.ports.riscv,gmane.linux.ports.arm.kernel,gmane.linux.ports.alpha,gmane.linux.ports.mips,gmane.linux.ports.parisc,gmane.linux.uml.devel,gmane.linux.kernel.arc,gmane.linux.ports.hexagon,gmane.linux.ports.sparc,gmane.linux.kernel.cross-arch,gmane.linux.documentation
Message-ID	<[email protected]>

On 7/7/26 21:06, Thomas Gleixner wrote:
> These functions integrate the stack randomization.
> 
> syscall_enter_from_user_mode_randomize_stack() has the advantage that the
> randomization happens early right after enter_from_user_mode().
> 
> In both cases also the overhead of get/put_cpu_var() in
> add_random_kstack_offset() is avoided.
> 
> No functional change.
> 
> Signed-off-by: Thomas Gleixner <[email protected]>
> Cc: [email protected]
> ---
>   arch/x86/entry/syscall_32.c         |   19 +++++--------------
>   arch/x86/entry/syscall_64.c         |    3 +--
>   arch/x86/include/asm/entry-common.h |    1 -
>   3 files changed, 6 insertions(+), 17 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <[email protected]>