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 <[email protected]>
/*
******************************************************************************
*
* 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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