github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-09-24 06:24:02 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

loongarch/syscall: Use syscall_enter_from_user_mode_randomize_stack()

Browse Source 
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 <tglx@kernel.org>
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/20260707190253.865955911@kernel.org
This commit is contained in:
Thomas Gleixner 2026-07-07 21:06:11 +02:00
parent 855c103f86
commit 7892c5a22a
1 changed files with 1 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/loongarch/kernel/syscall.c
View File

@ -11,7 +11,6 @@
#include <linux/linkage.h>
#include <linux/nospec.h>
#include <linux/objtool.h>
#include <linux/randomize_kstack.h>
#include <linux/syscalls.h>
#include <linux/unistd.h>
@ -70,9 +69,7 @@ void noinstr __no_stack_protector do_syscall(struct pt_regs *regs)
regs->orig_a0 = regs->regs[4];
regs->regs[4] = -ENOSYS;
nr = syscall_enter_from_user_mode(regs, nr);
add_random_kstack_offset();
nr = syscall_enter_from_user_mode_randomize_stack(regs, nr);
if (nr < NR_syscalls) {
syscall_fn = sys_call_table[array_index_nospec(nr, NR_syscalls)];