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riscv/syscall: Use syscall_enter_from_user_mode_randomize_stack()

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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/20260707190253.974626922@kernel.org
This commit is contained in:
Thomas Gleixner
2026-07-12 12:38:01 +02:00
parent 3b2b9c0198
commit d023abfbc4
1 changed files with 1 additions and 4 deletions
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arch/riscv/kernel/traps.c
+1 -4
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@@ -7,7 +7,6 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irqflags.h>
#include <linux/randomize_kstack.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/sched/signal.h>
@@ -333,9 +332,7 @@ void do_trap_ecall_u(struct pt_regs *regs)
riscv_v_vstate_discard(regs);
syscall = syscall_enter_from_user_mode(regs, syscall);
add_random_kstack_offset();
syscall = syscall_enter_from_user_mode_randomize_stack(regs, syscall);
if (syscall >= 0 && syscall < NR_syscalls) {
syscall = array_index_nospec(syscall, NR_syscalls);