The following commit has been merged into the core/entry branch of tip:
Commit-ID: d023abfbc4dca9ad9c9928b5b5a38b1628ee1a5d
Gitweb: https://git.kernel.org/tip/d023abfbc4dca9ad9c9928b5b5a38b1628ee1a5d
Author: Thomas Gleixner <tglx@kernel.org>
AuthorDate: Tue, 07 Jul 2026 21:06:19 +02:00
Committer: Thomas Gleixner <tglx@kernel.org>
CommitterDate: Sun, 12 Jul 2026 12:38:01 +02:00
riscv/syscall: Use syscall_enter_from_user_mode_randomize_stack()
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
---
arch/riscv/kernel/traps.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 8c62c77..bb18011 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -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);