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/*
* Check decoding of signal delivery.
*
* Copyright (c) 2016-2020 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "pidns.h"
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
static volatile int s_sig, s_code, s_pid, s_uid;
static void
handler(int sig, siginfo_t *info, void *ucontext)
{
s_sig = info->si_signo;
s_code = info->si_code;
s_pid = info->si_pid;
s_uid = info->si_uid;
}
int
main(void)
{
PIDNS_TEST_INIT;
static const char prefix[] = "KERNEL BUG";
int printed = 0;
const int pid = getpid();
const char *pid_str = pidns_pid2str(PT_TGID);
const int uid = geteuid();
for (int sig = 1; sig <= 31; ++sig) {
if (sig == SIGKILL || sig == SIGSTOP)
continue;
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, sig);
if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
perror_msg_and_fail("sigprocmask");
static const struct sigaction act = {
.sa_sigaction = handler,
.sa_flags = SA_SIGINFO
};
if (sigaction(sig, &act, NULL))
perror_msg_and_fail("sigaction: %d", sig);
if (kill(pid, sig) != 0)
perror_msg_and_fail("kill: %d", sig);
#ifdef MPERS_IS_m32
/*
* The tracee has received a compat siginfo_t but
* the tracer has received a native siginfo_t.
*/
const int e_sig = sig;
const int e_pid = pid;
const int e_uid = uid;
#else
/*
* If the tracee is a native process,
* then the tracer is also native.
* If the tracee is a compat process,
* then the tracer is also compat.
* Anyway, both the tracee and the tracer
* have received the same siginfo_t.
*/
const int e_sig = s_sig;
const int e_pid = s_pid;
const int e_uid = s_uid;
#endif
pidns_print_leader();
printf("kill(%d%s, %s) = 0\n", pid, pid_str, signal2name(sig));
pidns_print_leader();
printf("--- %s {si_signo=%s, si_code=SI_USER, si_pid=%d%s"
", si_uid=%d} ---\n",
signal2name(sig), signal2name(e_sig),
e_pid, pid_str, e_uid);
if (s_code || sig != s_sig || pid != s_pid || uid != s_uid) {
/*
* The kernel has failed to initialize siginfo_t
* properly. There is nothing that could be done
* on the strace side to workaround the kernel bug,
* so just print some useful diagnostics.
*/
if (!printed) {
printed = 1;
fprintf(stderr, "%s: siginfo_t\n", prefix);
}
fprintf(stderr,
"%s: expected: si_signo=%d, si_code=%d"
", si_pid=%d%s, si_uid=%d\n"
"%s: received: si_signo=%d, si_code=%d"
", si_pid=%d%s, si_uid=%d\n",
prefix, sig, SI_USER, pid, pid_str, uid,
prefix, sig, s_code, s_pid, pid_str, s_uid);
}
}
if (printed) {
fprintf(stderr, "%s: end of diagnostics\n"
"*** PLEASE FIX THE KERNEL ***\n", prefix);
}
pidns_print_leader();
puts("+++ exited with 0 +++");
return 0;
}
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