x86/syscall: Use [syscall_]enter_from_user_mode_randomize_stack()

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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 <tglx@kernel.org>
Tested-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Reviewed-by: Radu Rendec <radu@rendec.net>
Reviewed-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Reviewed-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Link: https://patch.msgid.link/20260707190254.079478122@kernel.org

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This commit is contained in:

Thomas Gleixner 2026-07-07 21:06:27 +02:00

parent 05a194d8bd

commit 9d311796e2

3 changed files with 6 additions and 17 deletions

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19

arch/x86/entry/syscall_32.c

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3

arch/x86/entry/syscall_64.c

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1

arch/x86/include/asm/entry-common.h

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