478 lines
15 KiB
C
478 lines
15 KiB
C
/*
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* Check decoding of ptrace syscall.
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*
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* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <sys/syscall.h>
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#ifdef __NR_rt_sigprocmask
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# include <errno.h>
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# include <signal.h>
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# include <stdio.h>
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# include <string.h>
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# include <sys/wait.h>
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# include <unistd.h>
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# include "ptrace.h"
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# include <linux/audit.h>
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static long
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do_ptrace(unsigned long request, unsigned long pid,
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unsigned long addr, unsigned long data)
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{
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return syscall(__NR_ptrace, request, pid, addr, data);
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}
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static void
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test_peeksiginfo(unsigned long pid, const unsigned long bad_request)
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{
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long rc = do_ptrace(PTRACE_PEEKSIGINFO, pid, 0, bad_request);
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printf("ptrace(PTRACE_PEEKSIGINFO, %u, NULL, %#lx)"
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" = %ld %s (%m)\n", (unsigned) pid, bad_request, rc, errno2name());
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struct {
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unsigned long long off;
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unsigned int flags, nr;
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} *const psi = tail_alloc(sizeof(*psi));
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psi->off = 0xdeadbeeffacefeed;
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psi->flags = 1;
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psi->nr = 42;
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rc = do_ptrace(PTRACE_PEEKSIGINFO,
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pid, (unsigned long) psi, bad_request);
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printf("ptrace(PTRACE_PEEKSIGINFO, %u, {off=%llu"
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", flags=PTRACE_PEEKSIGINFO_SHARED, nr=%u}, %#lx)"
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" = %ld %s (%m)\n",
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(unsigned) pid, psi->off, psi->nr, bad_request, rc, errno2name());
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pid = fork();
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if ((pid_t) pid < 0)
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perror_msg_and_fail("fork");
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if (!pid) {
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sigset_t mask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGUSR1);
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sigaddset(&mask, SIGUSR2);
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sigaddset(&mask, SIGALRM);
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if (sigprocmask(SIG_BLOCK, &mask, NULL))
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perror_msg_and_fail("sigprocmask");
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raise(SIGUSR1);
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raise(SIGUSR2);
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raise(SIGALRM);
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if (do_ptrace(PTRACE_TRACEME, 0, 0, 0))
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perror_msg_and_fail("child: PTRACE_TRACEME");
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raise(SIGSTOP);
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_exit(0);
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}
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const unsigned int nsigs = 4;
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const uid_t uid = geteuid();
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siginfo_t *sigs = tail_alloc(sizeof(*sigs) * nsigs);
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psi->off = 0;
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psi->flags = 0;
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psi->nr = nsigs;
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for (;;) {
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int status, tracee, saved;
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errno = 0;
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tracee = wait(&status);
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if (tracee <= 0) {
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if (errno == EINTR)
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continue;
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saved = errno;
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kill (pid, SIGKILL);
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errno = saved;
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perror_msg_and_fail("wait");
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}
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if (WIFEXITED(status)) {
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if (WEXITSTATUS(status) == 0)
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break;
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error_msg_and_fail("unexpected exit status %u",
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WEXITSTATUS(status));
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}
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if (WIFSIGNALED(status))
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error_msg_and_fail("unexpected signal %u",
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WTERMSIG(status));
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if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGSTOP) {
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kill(pid, SIGKILL);
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error_msg_and_fail("unexpected wait status %x",
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status);
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}
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rc = do_ptrace(PTRACE_PEEKSIGINFO, pid,
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(unsigned long) psi, (unsigned long) sigs);
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if (rc < 0) {
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printf("ptrace(PTRACE_PEEKSIGINFO, %u, {off=%llu"
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", flags=0, nr=%u}, %p) = %ld %s (%m)\n",
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(unsigned) pid, psi->off, psi->nr, sigs,
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rc, errno2name());
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} else {
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printf("ptrace(PTRACE_PEEKSIGINFO, %u, {off=%llu"
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", flags=0, nr=%u}"
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", [{si_signo=SIGUSR1, si_code=SI_TKILL"
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", si_pid=%u, si_uid=%u}"
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", {si_signo=SIGUSR2, si_code=SI_TKILL"
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", si_pid=%u, si_uid=%u}"
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", {si_signo=SIGALRM, si_code=SI_TKILL"
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", si_pid=%u, si_uid=%u}"
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"]) = %ld\n",
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(unsigned) pid, psi->off, psi->nr,
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(unsigned) pid, (unsigned) uid,
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(unsigned) pid, (unsigned) uid,
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(unsigned) pid, (unsigned) uid,
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rc);
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}
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if (do_ptrace(PTRACE_CONT, pid, 0, 0)) {
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saved = errno;
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kill (pid, SIGKILL);
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errno = saved;
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perror_msg_and_fail("ptrace");
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}
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printf("ptrace(PTRACE_CONT, %ld, NULL, SIG_0) = 0\n", pid);
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}
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}
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int
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main(void)
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{
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const unsigned long bad_request =
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(unsigned long) 0xdeadbeeffffffeed;
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const unsigned long bad_data =
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(unsigned long) 0xdeadcafefffff00d;
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const unsigned long pid =
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(unsigned long) 0xdefaced00000000 | (unsigned) getpid();
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unsigned int sigset_size;
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for (sigset_size = 1024 / 8; sigset_size; sigset_size >>= 1) {
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if (!syscall(__NR_rt_sigprocmask,
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SIG_SETMASK, NULL, NULL, sigset_size))
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break;
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}
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if (!sigset_size)
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perror_msg_and_fail("rt_sigprocmask");
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void *const k_set = tail_alloc(sigset_size);
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siginfo_t *const sip = tail_alloc(sizeof(*sip));
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long rc = do_ptrace(bad_request, pid, 0, 0);
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printf("ptrace(%#lx /* PTRACE_??? */, %u, NULL, NULL) = %ld %s (%m)\n",
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bad_request, (unsigned) pid, rc, errno2name());
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rc = do_ptrace(PTRACE_PEEKDATA, pid, bad_request, bad_data);
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# ifdef IA64
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printf("ptrace(PTRACE_PEEKDATA, %u, %#lx)"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, rc, errno2name());
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# else
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printf("ptrace(PTRACE_PEEKDATA, %u, %#lx, %#lx)"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, bad_data, rc, errno2name());
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#endif
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rc = do_ptrace(PTRACE_PEEKTEXT, pid, bad_request, bad_data);
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# ifdef IA64
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printf("ptrace(PTRACE_PEEKTEXT, %u, %#lx)"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, rc, errno2name());
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# else
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printf("ptrace(PTRACE_PEEKTEXT, %u, %#lx, %#lx)"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, bad_data, rc, errno2name());
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#endif
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rc = do_ptrace(PTRACE_PEEKUSER, pid, bad_request, bad_data);
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# ifdef IA64
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printf("ptrace(PTRACE_PEEKUSER, %u, %#lx)"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, rc, errno2name());
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# else
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printf("ptrace(PTRACE_PEEKUSER, %u, %#lx, %#lx)"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, bad_data, rc, errno2name());
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#endif
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rc = do_ptrace(PTRACE_POKEUSER, pid, bad_request, bad_data);
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printf("ptrace(PTRACE_POKEUSER, %u, %#lx, %#lx)"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, bad_data, rc, errno2name());
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rc = do_ptrace(PTRACE_ATTACH, pid, 0, 0);
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printf("ptrace(PTRACE_ATTACH, %u) = %ld %s (%m)\n",
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(unsigned) pid, rc, errno2name());
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rc = do_ptrace(PTRACE_INTERRUPT, pid, 0, 0);
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printf("ptrace(PTRACE_INTERRUPT, %u) = %ld %s (%m)\n",
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(unsigned) pid, rc, errno2name());
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rc = do_ptrace(PTRACE_KILL, pid, 0, 0);
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printf("ptrace(PTRACE_KILL, %u) = %ld %s (%m)\n",
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(unsigned) pid, rc, errno2name());
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rc = do_ptrace(PTRACE_LISTEN, pid, 0, 0);
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printf("ptrace(PTRACE_LISTEN, %u) = %ld %s (%m)\n",
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(unsigned) pid, rc, errno2name());
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sigset_t libc_set;
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sigemptyset(&libc_set);
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sigaddset(&libc_set, SIGUSR1);
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memcpy(k_set, &libc_set, sigset_size);
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rc = do_ptrace(PTRACE_SETSIGMASK,
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pid, sigset_size, (unsigned long) k_set);
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printf("ptrace(PTRACE_SETSIGMASK, %u, %u, [USR1])"
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" = %ld %s (%m)\n",
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(unsigned) pid, sigset_size, rc, errno2name());
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rc = do_ptrace(PTRACE_GETSIGMASK,
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pid, sigset_size, (unsigned long) k_set);
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printf("ptrace(PTRACE_GETSIGMASK, %u, %u, %p)"
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" = %ld %s (%m)\n",
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(unsigned) pid, sigset_size, k_set, rc, errno2name());
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rc = do_ptrace(PTRACE_SECCOMP_GET_FILTER, pid, 42, 0);
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printf("ptrace(PTRACE_SECCOMP_GET_FILTER, %u, 42, NULL)"
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" = %ld %s (%m)\n", (unsigned) pid, rc, errno2name());
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rc = do_ptrace(PTRACE_GETEVENTMSG, pid, bad_request, bad_data);
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printf("ptrace(PTRACE_GETEVENTMSG, %u, %#lx, %#lx)"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, bad_data, rc, errno2name());
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memset(sip, -1, sizeof(*sip));
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sip->si_signo = SIGIO;
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sip->si_code = 1;
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sip->si_errno = ENOENT;
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sip->si_band = -2;
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rc = do_ptrace(PTRACE_SETSIGINFO,
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pid, bad_request, (unsigned long) sip);
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printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGIO"
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", si_code=POLL_IN, si_errno=ENOENT, si_band=-2})"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, rc, errno2name());
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memset(sip, -1, sizeof(*sip));
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sip->si_signo = SIGTRAP;
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sip->si_code = 1;
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sip->si_errno = ENOENT;
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sip->si_pid = 2;
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sip->si_uid = 3;
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sip->si_ptr = (void *) bad_request;
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rc = do_ptrace(PTRACE_SETSIGINFO,
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pid, bad_request, (unsigned long) sip);
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printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGTRAP"
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", si_code=TRAP_BRKPT, si_errno=ENOENT, si_pid=2, si_uid=3"
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", si_value={int=%d, ptr=%p}}) = %ld %s (%m)\n",
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(unsigned) pid, bad_request, sip->si_int, sip->si_ptr, rc, errno2name());
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memset(sip, -1, sizeof(*sip));
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sip->si_signo = SIGILL;
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sip->si_code = 1;
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sip->si_errno = ENOENT;
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sip->si_addr = (void *) (unsigned long) 0xfacefeeddeadbeef;
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rc = do_ptrace(PTRACE_SETSIGINFO,
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pid, bad_request, (unsigned long) sip);
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printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGILL"
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", si_code=ILL_ILLOPC, si_errno=ENOENT, si_addr=%p})"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, sip->si_addr, rc, errno2name());
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memset(sip, -1, sizeof(*sip));
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sip->si_signo = SIGFPE;
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sip->si_code = 1;
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sip->si_errno = ENOENT;
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sip->si_addr = (void *) (unsigned long) 0xfacefeeddeadbeef;
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rc = do_ptrace(PTRACE_SETSIGINFO,
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pid, bad_request, (unsigned long) sip);
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printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGFPE"
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", si_code=FPE_INTDIV, si_errno=ENOENT, si_addr=%p})"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, sip->si_addr, rc, errno2name());
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memset(sip, -1, sizeof(*sip));
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sip->si_signo = SIGBUS;
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sip->si_code = 1;
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sip->si_errno = -2;
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sip->si_addr = (void *) (unsigned long) 0xfacefeeddeadbeef;
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rc = do_ptrace(PTRACE_SETSIGINFO,
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pid, bad_request, (unsigned long) sip);
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printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGBUS"
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", si_code=BUS_ADRALN, si_errno=%d, si_addr=%p})"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, sip->si_errno, sip->si_addr,
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rc, errno2name());
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memset(sip, -1, sizeof(*sip));
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sip->si_signo = SIGPROF;
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sip->si_code = 0xbadc0ded;
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sip->si_errno = -2;
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sip->si_pid = 0;
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sip->si_uid = 3;
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sip->si_ptr = 0;
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rc = do_ptrace(PTRACE_SETSIGINFO,
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pid, bad_request, (unsigned long) sip);
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printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGPROF"
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", si_code=%#x, si_errno=%d, si_pid=0, si_uid=3})"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, sip->si_code, sip->si_errno,
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rc, errno2name());
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#ifdef HAVE_SIGINFO_T_SI_SYSCALL
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memset(sip, -1, sizeof(*sip));
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sip->si_signo = SIGSYS;
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sip->si_code = 1;
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sip->si_errno = ENOENT;
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sip->si_call_addr = (void *) (unsigned long) 0xfacefeeddeadbeef;
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sip->si_syscall = -1U;
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sip->si_arch = AUDIT_ARCH_X86_64;
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rc = do_ptrace(PTRACE_SETSIGINFO,
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pid, bad_request, (unsigned long) sip);
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printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGSYS"
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", si_code=SYS_SECCOMP, si_errno=ENOENT, si_call_addr=%p"
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", si_syscall=__NR_syscall_%u, si_arch=AUDIT_ARCH_X86_64})"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, sip->si_call_addr, sip->si_syscall,
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rc, errno2name());
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#endif
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#if defined HAVE_SIGINFO_T_SI_TIMERID && defined HAVE_SIGINFO_T_SI_OVERRUN
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memset(sip, -1, sizeof(*sip));
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sip->si_signo = SIGHUP;
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sip->si_code = SI_TIMER;
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sip->si_errno = ENOENT;
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sip->si_timerid = 0xdeadbeef;
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sip->si_overrun = -1;
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sip->si_ptr = (void *) (unsigned long) 0xfacefeeddeadbeef;
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rc = do_ptrace(PTRACE_SETSIGINFO,
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pid, bad_request, (unsigned long) sip);
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printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGHUP"
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", si_code=SI_TIMER, si_errno=ENOENT, si_timerid=%#x"
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", si_overrun=%d, si_value={int=%d, ptr=%p}}) = %ld %s (%m)\n",
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(unsigned) pid, bad_request, sip->si_timerid, sip->si_overrun,
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sip->si_int, sip->si_ptr, rc, errno2name());
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#endif
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rc = do_ptrace(PTRACE_GETSIGINFO,
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pid, bad_request, (unsigned long) sip);
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printf("ptrace(PTRACE_GETSIGINFO, %u, %#lx, %p)"
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" = %ld %s (%m)\n", (unsigned) pid, bad_request, sip, rc, errno2name());
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rc = do_ptrace(PTRACE_CONT, pid, 0, SIGUSR1);
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printf("ptrace(PTRACE_CONT, %u, NULL, SIGUSR1) = %ld %s (%m)\n",
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(unsigned) pid, rc, errno2name());
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rc = do_ptrace(PTRACE_DETACH, pid, 0, SIGUSR2);
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printf("ptrace(PTRACE_DETACH, %u, NULL, SIGUSR2) = %ld %s (%m)\n",
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(unsigned) pid, rc, errno2name());
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rc = do_ptrace(PTRACE_SYSCALL, pid, 0, SIGUSR1);
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printf("ptrace(PTRACE_SYSCALL, %u, NULL, SIGUSR1) = %ld %s (%m)\n",
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(unsigned) pid, rc, errno2name());
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#ifdef PTRACE_SINGLESTEP
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rc = do_ptrace(PTRACE_SINGLESTEP, pid, 0, SIGUSR2);
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printf("ptrace(PTRACE_SINGLESTEP, %u, NULL, SIGUSR2) = %ld %s (%m)\n",
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(unsigned) pid, rc, errno2name());
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#endif
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#ifdef PTRACE_SINGLEBLOCK
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rc = do_ptrace(PTRACE_SINGLEBLOCK, pid, 0, SIGUSR1);
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printf("ptrace(PTRACE_SINGLEBLOCK, %u, NULL, SIGUSR1) = %ld %s (%m)\n",
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(unsigned) pid, rc, errno2name());
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#endif
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#ifdef PTRACE_SYSEMU
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rc = do_ptrace(PTRACE_SYSEMU, pid, 0, SIGUSR2);
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printf("ptrace(PTRACE_SYSEMU, %u, NULL, SIGUSR2) = %ld %s (%m)\n",
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(unsigned) pid, rc, errno2name());
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#endif
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#ifdef PTRACE_SYSEMU_SINGLESTEP
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rc = do_ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, SIGUSR1);
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printf("ptrace(PTRACE_SYSEMU_SINGLESTEP, %u, NULL, SIGUSR1)"
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" = %ld %s (%m)\n", (unsigned) pid, rc, errno2name());
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#endif
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rc = do_ptrace(PTRACE_SETOPTIONS,
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pid, 0, PTRACE_O_TRACEFORK|PTRACE_O_TRACECLONE);
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printf("ptrace(PTRACE_SETOPTIONS, %u, NULL"
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", PTRACE_O_TRACEFORK|PTRACE_O_TRACECLONE) = %ld %s (%m)\n",
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(unsigned) pid, rc, errno2name());
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rc = do_ptrace(PTRACE_SEIZE,
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pid, bad_request, PTRACE_O_TRACESYSGOOD);
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printf("ptrace(PTRACE_SEIZE, %u, %#lx"
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", PTRACE_O_TRACESYSGOOD) = %ld %s (%m)\n",
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(unsigned) pid, bad_request, rc, errno2name());
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rc = do_ptrace(PTRACE_SETREGSET, pid, 1, bad_request);
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printf("ptrace(PTRACE_SETREGSET, %u, NT_PRSTATUS, %#lx)"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, rc, errno2name());
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rc = do_ptrace(PTRACE_GETREGSET, pid, 3, bad_request);
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printf("ptrace(PTRACE_GETREGSET, %u, NT_PRPSINFO, %#lx)"
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" = %ld %s (%m)\n",
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(unsigned) pid, bad_request, rc, errno2name());
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test_peeksiginfo(pid, bad_request);
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rc = do_ptrace(PTRACE_TRACEME, 0, 0, 0);
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if (rc)
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printf("ptrace(PTRACE_TRACEME) = %ld %s (%m)\n",
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rc, errno2name());
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else
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printf("ptrace(PTRACE_TRACEME) = 0\n");
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puts("+++ exited with 0 +++");
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return 0;
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}
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#else
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SKIP_MAIN_UNDEFINED("__NR_rt_sigprocmask")
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#endif
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