On Tue, 2026-07-07 at 21:06 +0200, 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(-) > > --- 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 *reg > > 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);
Reviewed-by: Radu Rendec <[email protected]>
