Re: [patch 06/18] riscv/syscall: Use syscall_enter_from_user_mode_randomize_stack()

Philippe Mathieu-Daudé <[email protected]> Thu, 9 Jul 2026 13:16:51 +0200

Newsgroups	gmane.linux.uml.devel,gmane.linux.kernel,gmane.linux.ports.riscv,gmane.linux.ports.ppc64.devel,gmane.linux.ports.arm.kernel,gmane.linux.ports.alpha,gmane.linux.ports.mips,gmane.linux.ports.parisc,gmane.linux.ports.sh.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:
> syscall_enter_from_user_mode_randomize_stack() replaces
> syscall_enter_from_user_mode() and the subsequent invocation of
> add_random_kstack_offset().
> 
> The advantage is that it applies the stack randomization right after
> enter_from_user_mode() and thereby avoids the overhead of get/put_cpu_var()
> as that code is invoked with interrupts disabled.
> 
> No functional change.
> 
> Signed-off-by: Thomas Gleixner <[email protected]>
> Cc: Paul Walmsley <[email protected]>
> Cc: Palmer Dabbelt <[email protected]>
> Cc: [email protected]
> ---
>   arch/riscv/kernel/traps.c |    5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)

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