[PATCH perf/core 2/3] selftests/bpf: Fix uprobe_sigill test for uprobe syscall error value

[Jiri Olsa]

The uprobe syscall now returns -ENXIO errno when called outside
kernel trampoline, fixing the current sigill test to reflect that
and renaming it to uprobe_error.

Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 .../selftests/bpf/prog_tests/uprobe_syscall.c | 34 ++++---------------
 1 file changed, 6 insertions(+), 28 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c 
b/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
index 5da0b49eeaca..6d75ede16e7c 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
@@ -757,34 +757,12 @@ static void test_uprobe_race(void)
 #define __NR_uprobe 336
 #endif
 
-static void test_uprobe_sigill(void)
+static void test_uprobe_error(void)
 {
-       int status, err, pid;
+       long err = syscall(__NR_uprobe);
 
-       pid = fork();
-       if (!ASSERT_GE(pid, 0, "fork"))
-               return;
-       /* child */
-       if (pid == 0) {
-               asm volatile (
-                       "pushq %rax\n"
-                       "pushq %rcx\n"
-                       "pushq %r11\n"
-                       "movq $" __stringify(__NR_uprobe) ", %rax\n"
-                       "syscall\n"
-                       "popq %r11\n"
-                       "popq %rcx\n"
-                       "retq\n"
-               );
-               exit(0);
-       }
-
-       err = waitpid(pid, &status, 0);
-       ASSERT_EQ(err, pid, "waitpid");
-
-       /* verify the child got killed with SIGILL */
-       ASSERT_EQ(WIFSIGNALED(status), 1, "WIFSIGNALED");
-       ASSERT_EQ(WTERMSIG(status), SIGILL, "WTERMSIG");
+       ASSERT_EQ(err, -1, "error");
+       ASSERT_EQ(errno, ENXIO, "errno");
 }
 
 static void __test_uprobe_syscall(void)
@@ -805,8 +783,8 @@ static void __test_uprobe_syscall(void)
                test_uprobe_usdt();
        if (test__start_subtest("uprobe_race"))
                test_uprobe_race();
-       if (test__start_subtest("uprobe_sigill"))
-               test_uprobe_sigill();
+       if (test__start_subtest("uprobe_error"))
+               test_uprobe_error();
        if (test__start_subtest("uprobe_regs_equal"))
                test_uprobe_regs_equal(false);
        if (test__start_subtest("regs_change"))
-- 
2.51.0