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powerpc: Move stack randomization after syscall_enter_from_user_mode()

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add_random_kstack_offset() is invoked before syscall_enter_from_user_mode()
establishes state. That's wrong because add_random_kstack_offset() calls
into instrumentable code.

Move it after syscall_enter_from_user_mode() to ensure that state is
correctly established.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.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/20260707190253.718191130@kernel.org
This commit is contained in:
Thomas Gleixner 2026-07-07 21:05:58 +02:00
parent 5b6e32ba7b
commit 89d163dd9d
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/syscall.c
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@ -19,8 +19,8 @@ notrace long system_call_exception(struct pt_regs *regs, unsigned long r0)
long ret;
syscall_fn f;
add_random_kstack_offset();
r0 = syscall_enter_from_user_mode(regs, r0);
add_random_kstack_offset();
if (unlikely(r0 >= NR_syscalls)) {
if (unlikely(trap_is_unsupported_scv(regs))) {