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* [LTP] [New test] ptrace05.c - ptrace(PTRACE_TRACEME, ...) test
@ 2009-10-22  6:14 Garrett Cooper
  2009-10-26 17:02 ` Subrata Modak
  0 siblings, 1 reply; 5+ messages in thread
From: Garrett Cooper @ 2009-10-22  6:14 UTC (permalink / raw)
  To: LTP list

    The following calls ptrace(PTRACE_TRACEME, 0) for all signals and
validates that all signals apart from SIGKILL are properly intercepted
and WIFSTOPPED remains true, and SIGKILL is properly treated as
WIFSIGNALED() && WTERMSIG() returns SIGKILL.

    1. This test app helped unroot another issue with our custom Linux
platform here at Cisco.
    2. This test application does function properly on a Gentoo Linux
based x86_64 / 2.6.30 kernel however, so it's an issue with our OS
platform.

    I will add this application to testcases/kernel/syscalls/ptrace,
if someone else sees the value in it. I agree that additional error
checking could be added for the calls to kill(2)... I just whipped
this up in 45 mins after finding this strange behavior on our
platform.

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>

/*
 ******************************************************************************
 *
 *   ptrace05 - an app which does PTRACE_TRACEME over the maximum available
 *   signal range, or a set user-defined range.
 *
 *   Copyright (C) 2009, Garrett Cooper
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License along
 *   with this program; if not, write to the Free Software Foundation, Inc.,
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 ******************************************************************************
 */

#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <errno.h>
#include <libgen.h>
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "test.h"
#include "usctest.h"

char	*TCID		= "ptrace05";
int	TST_TOTAL	= 0;

int usage(const char*);

int
usage(const char *argv0)
{
	fprintf(stderr, "usage: %s [start-signum] [end-signum]\n", argv0);
	return 1;
}

int
main(int argc, char **argv)
{

	int end_signum = -1;
       	int signum;
	int start_signum = -1;
	int status;

	pid_t child;

	/* Parse the CLI args appropriately. */
	switch (argc) {
	case 3:
		end_signum = (int) strtol((const char*) *(argv+2), NULL, 10);
		/* Parse the signal value. */
		if (end_signum == 0 && errno != 0) {
			tst_resm(TBROK, "argument (%s) isn't a valid number.\n",
					*(argv+2));
			tst_exit();
		}
		/* FALLTHROUGH */
	case 2:
		start_signum = (int) strtol((const char*) *(argv+1), NULL, 10);
		/* Parse the signal value. */
		if (end_signum == 0 && errno != 0) {
			tst_resm(TBROK, "argument (%s) isn't a valid number.\n",
					*(argv+1) );
			tst_exit();
		}
		break;
	case 1:
		/* Do nothing. */
		break;
	default:
		return usage(basename(*argv));
	}

	if (start_signum == -1) {
		start_signum = 0;
	}
	if (end_signum == -1) {
		end_signum = SIGRTMAX;
	}

	for (signum = start_signum; signum <= end_signum; signum++) {

		switch (child = fork()) {
		case -1:
			tst_resm(TBROK | TERRNO, "Failed to fork properly.");
			break;
		case 0:

			if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) != -1) {
				tst_resm(TINFO, "[child] Sending kill(.., %d)",
						signum);
				kill(getpid(), signum);
			} else {

				/*
				 * This won't increment the TST_COUNT var.
				 * properly, but it'll show up as a failure
				 * nonetheless.
				 */
				tst_resm(TFAIL | TERRNO,
					"Failed to ptrace(PTRACE_TRACEME, ...) "
					"properly");

			}
			exit(2); /* Shouldn't get here. */

			break;

		default:

			waitpid(child, &status, 0);

			switch(signum) {

                        /*
                         * SIGKILL should be trigger WIFSIGNALED => `true',
                         * and should return WTERMSIG => SIGKILL
                         */
			case SIGKILL:
				if (WIFSIGNALED(status)) {
					/* SIGKILL must be uncatchable. */
					if (WTERMSIG(status) == SIGKILL) {
						tst_resm(TPASS,
							"Killed with SIGKILL, "
							"as expected.");
					} else {
						tst_resm(TPASS,
							"Didn't die with "
							"SIGKILL (?!) ");
					}
				} else if (WIFEXITED(status)) {
					tst_resm(TFAIL,
						"Exited unexpectedly instead "
						"of dying with SIGKILL.");
				} else if (WIFSTOPPED(status)) {
					tst_resm(TFAIL,
						"Stopped instead of dying "
						"with SIGKILL.");
				}
				break;
			/* All other processes should be stopped. */
			default:
				if (WIFSTOPPED(status)) {
					tst_resm(TPASS, "Stopped as expected");
				} else {
					tst_resm(TFAIL, "Didn't stop as "
							"expected.");
					if (kill (child, 0)) {
						tst_resm(TINFO,
							"Is still alive!?");
					} else if (WIFEXITED(status)) {
						tst_resm(TINFO,
							"Exited normally");
					} else if (WIFSIGNALED(status)) {
						tst_resm(TINFO,
							"Was signaled with "
							"signum=%d",
							WTERMSIG(status));
					}

				}

				break;

			}
				
		}
		/* Make sure the child dies a quick and painless death ... */
		kill(child, 9);

	}
		
	tst_exit();

}

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^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2009-10-29 18:32 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2009-10-22  6:14 [LTP] [New test] ptrace05.c - ptrace(PTRACE_TRACEME, ...) test Garrett Cooper
2009-10-26 17:02 ` Subrata Modak
2009-10-26 19:33   ` Garrett Cooper
2009-10-27  7:33     ` Subrata Modak
2009-10-29 18:31     ` Subrata Modak

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