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Miller" , Andreas Larsson , linux-snps-arc@lists.infradead.org, linux-hexagon@vger.kernel.org, linux-openrisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, =?UTF-8?q?Michal=20Such=C3=A1nek?= , Jonathan Corbet , linux-doc@vger.kernel.org Subject: [patch 06/18] riscv/syscall: Use syscall_enter_from_user_mode_randomize_stack() References: <20260707181957.433213175@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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 Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: linux-riscv@lists.infradead.org --- 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 #include #include -#include #include #include #include @@ -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);