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selftests/bpf: Add uprobe syscall sigill signal test

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Make sure that calling uprobe syscall from outside uprobe trampoline
results in sigill signal.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20250720112133.244369-17-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2025-07-20 13:21:26 +02:00 committed by Peter Zijlstra
parent c8be59667c
commit c11661bd9a
1 changed files with 36 additions and 0 deletions
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36
tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
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@ -735,6 +735,40 @@ static void test_uprobe_race(void)
ASSERT_FALSE(USDT_SEMA_IS_ACTIVE(race), "race_semaphore");
}
#ifndef __NR_uprobe
#define __NR_uprobe 336
#endif
static void test_uprobe_sigill(void)
{
int status, err, pid;
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");
}
static void __test_uprobe_syscall(void)
{
if (test__start_subtest("uretprobe_regs_equal"))
@ -755,6 +789,8 @@ 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();
}
#else
static void __test_uprobe_syscall(void)