[LTP] [PATCH 2/2] syscalls/ptrace02: Add another EPERM error test

[Cyril Hrubis <chrubis@suse.cz>]

Hi!
> +static void verify_ptrace(void)
> +{
> +	int child_pid;
> +
> +	tst_res(TINFO, "Trace a process that don't have CAP_SYS_PTRACE capability(nobody user) for it");

I wouldn't be printing this verbose info here, anyone who will have to
debug the test failures will look into the source code and at the test
description in the top level comment.

> +	child_pid = SAFE_FORK();
> +	if (!child_pid)
> +		pause();
> +
> +	if (!SAFE_FORK()) {
> +		SAFE_SETUID(uid);
> +		TEST(ptrace(PTRACE_ATTACH, child_pid, NULL, NULL));
> +		if (TST_RET == 0) {
> +			tst_res(TFAIL, "ptrace() succeeded unexpectedly");
> +			TST_CHECKPOINT_WAKE(0);
> +			exit(0);
> +		}
> +		if (TST_ERR == EPERM)
> +			tst_res(TPASS | TTERRNO, "ptrace() failed as expected");
> +		else
> +			tst_res(TFAIL | TTERRNO, "ptrace() expected EPERM, but got");
> +		TST_CHECKPOINT_WAKE(0);
> +		exit(0);
> +	}
> +	TST_CHECKPOINT_WAIT(0);
> +	SAFE_KILL(child_pid, SIGKILL);
> +	SAFE_WAITPID(child_pid, NULL, 0);

We do not need the checkpoints here at all, we just need to waitpid for
the second child before we kill the first one.

> +	tst_reap_children();
> +}
> +
> +static void setup(void)
> +{
> +	struct passwd *pw;
> +
> +	pw = SAFE_GETPWNAM("nobody");
> +	uid = pw->pw_uid;
> +}
> +
> +static struct tst_test test = {
> +	.setup = setup,
> +	.test_all = verify_ptrace,
> +	.forks_child = 1,
> +	.needs_root = 1,
> +	.needs_checkpoints = 1,
> +};
> -- 
> 2.23.0
> 
> 
> 
> 
> -- 
> Mailing list info: https://lists.linux.it/listinfo/ltp

-- 
Cyril Hrubis
chrubis@suse.cz