seccomp/mips: change syscall_trace_enter() to use secure_computing()

arch/mips/Kconfig selects HAVE_ARCH_SECCOMP_FILTER so syscall_trace_enter()
can just use __secure_computing(NULL) and rely on populate_seccomp_data(sd)
and "sd == NULL" checks in __secure_computing(sd) paths.

With the change above syscall_trace_enter() can just use secure_computing()
and avoid #ifdef + test_thread_flag(TIF_SECCOMP). CONFIG_GENERIC_ENTRY is
not defined, so test_syscall_work(SECCOMP) will check TIF_SECCOMP.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Reviewed-by: Kees Cook <kees@kernel.org>
Link: https://lore.kernel.org/r/20250128150300.GA15318@redhat.com
Signed-off-by: Kees Cook <kees@kernel.org>

diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 61503a36067e9ef15c2ff7598256c6fd1de6ac8d..f7107479c7fa9ad0757ef7609d757bef4b7966e7 100644 (file)
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -1326,24 +1326,8 @@ asmlinkage long syscall_trace_enter(struct pt_regs *regs)
                        return -1;
        }
 
-#ifdef CONFIG_SECCOMP
-       if (unlikely(test_thread_flag(TIF_SECCOMP))) {
-               int ret, i;
-               struct seccomp_data sd;
-               unsigned long args[6];
-
-               sd.nr = current_thread_info()->syscall;
-               sd.arch = syscall_get_arch(current);
-               syscall_get_arguments(current, regs, args);
-               for (i = 0; i < 6; i++)
-                       sd.args[i] = args[i];
-               sd.instruction_pointer = KSTK_EIP(current);
-
-               ret = __secure_computing(&sd);
-               if (ret == -1)
-                       return ret;
-       }
-#endif
+       if (secure_computing())
+               return -1;
 
        if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
                trace_sys_enter(regs, regs->regs[2]);