From: Dmitry V. Levin Date: Thu, 12 May 2016 16:59:59 +0000 (+0000) Subject: tests: check decoding of ptrace syscall X-Git-Tag: v4.12~169 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=632efff9005e224f67d9212e47a1079046a993c5;p=strace tests: check decoding of ptrace syscall * tests/ptrace.c: New file. * tests/ptrace.test: New test. * tests/.gitignore: Add ptrace. * tests/Makefile.am (check_PROGRAMS): Likewise. (DECODER_TESTS): Add ptrace. --- diff --git a/tests/.gitignore b/tests/.gitignore index 0eae082e..05cbd43c 100644 --- a/tests/.gitignore +++ b/tests/.gitignore @@ -154,6 +154,7 @@ preadv preadv-pwritev preadv2-pwritev2 pselect6 +ptrace pwritev read-write readdir diff --git a/tests/Makefile.am b/tests/Makefile.am index da1d59db..a6642755 100644 --- a/tests/Makefile.am +++ b/tests/Makefile.am @@ -207,6 +207,7 @@ check_PROGRAMS = \ preadv-pwritev \ preadv2-pwritev2 \ pselect6 \ + ptrace \ pwritev \ read-write \ readdir \ @@ -488,6 +489,7 @@ DECODER_TESTS = \ preadv2-pwritev2.test \ preadv.test \ pselect6.test \ + ptrace.test \ pwritev.test \ read-write.test \ readdir.test \ diff --git a/tests/ptrace.c b/tests/ptrace.c new file mode 100644 index 00000000..c6c74fb4 --- /dev/null +++ b/tests/ptrace.c @@ -0,0 +1,481 @@ +/* + * Check decoding of ptrace syscall. + * + * Copyright (c) 2016 Dmitry V. Levin + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "tests.h" +#include + +#ifdef __NR_rt_sigprocmask + +# include +# include +# include +# include +# include +# include +# include "ptrace.h" +# include + +static long +do_ptrace(unsigned long request, unsigned long pid, + unsigned long addr, unsigned long data) +{ + return syscall(__NR_ptrace, request, pid, addr, data); +} + +static void +test_peeksiginfo(unsigned long pid, const unsigned long bad_request) +{ + long rc = do_ptrace(PTRACE_PEEKSIGINFO, pid, 0, bad_request); + printf("ptrace(PTRACE_PEEKSIGINFO, %u, NULL, %#lx)" + " = %ld %s (%m)\n", (unsigned) pid, bad_request, rc, errno2name()); + + struct { + unsigned long long off; + unsigned int flags, nr; + } *const psi = tail_alloc(sizeof(*psi)); + (void) tail_alloc(1); + + psi->off = 0xdeadbeeffacefeed; + psi->flags = 1; + psi->nr = 42; + + rc = do_ptrace(PTRACE_PEEKSIGINFO, + pid, (unsigned long) psi, bad_request); + printf("ptrace(PTRACE_PEEKSIGINFO, %u, {off=%llu" + ", flags=PTRACE_PEEKSIGINFO_SHARED, nr=%u}, %#lx)" + " = %ld %s (%m)\n", + (unsigned) pid, psi->off, psi->nr, bad_request, rc, errno2name()); + + pid = fork(); + if (pid < 0) + perror_msg_and_fail("fork"); + + if (!pid) { + sigset_t mask; + sigemptyset(&mask); + sigaddset(&mask, SIGUSR1); + sigaddset(&mask, SIGUSR2); + sigaddset(&mask, SIGALRM); + + if (sigprocmask(SIG_BLOCK, &mask, NULL)) + perror_msg_and_fail("sigprocmask"); + + raise(SIGUSR1); + raise(SIGUSR2); + raise(SIGALRM); + + if (do_ptrace(PTRACE_TRACEME, 0, 0, 0)) + perror_msg_and_fail("child: PTRACE_TRACEME"); + + raise(SIGSTOP); + _exit(0); + } + + const unsigned int nsigs = 4; + const uid_t uid = geteuid(); + siginfo_t *sigs = tail_alloc(sizeof(*sigs) * nsigs); + (void) tail_alloc(1); + + psi->off = 0; + psi->flags = 0; + psi->nr = nsigs; + + for (;;) { + int status, tracee, saved; + + errno = 0; + tracee = wait(&status); + if (tracee <= 0) { + if (errno == EINTR) + continue; + saved = errno; + kill (pid, SIGKILL); + errno = saved; + perror_msg_and_fail("wait"); + } + if (WIFEXITED(status)) { + if (WEXITSTATUS(status) == 0) + break; + error_msg_and_fail("unexpected exit status %u", + WEXITSTATUS(status)); + } + if (WIFSIGNALED(status)) + error_msg_and_fail("unexpected signal %u", + WTERMSIG(status)); + if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGSTOP) { + kill(pid, SIGKILL); + error_msg_and_fail("unexpected wait status %x", + status); + } + + rc = do_ptrace(PTRACE_PEEKSIGINFO, pid, + (unsigned long) psi, (unsigned long) sigs); + if (rc < 0) { + printf("ptrace(PTRACE_PEEKSIGINFO, %u, {off=%llu" + ", flags=0, nr=%u}, %p) = %ld %s (%m)\n", + (unsigned) pid, psi->off, psi->nr, sigs, + rc, errno2name()); + } else { + printf("ptrace(PTRACE_PEEKSIGINFO, %u, {off=%llu" + ", flags=0, nr=%u}" + ", [{si_signo=SIGUSR1, si_code=SI_TKILL" + ", si_pid=%u, si_uid=%u}" + ", {si_signo=SIGUSR2, si_code=SI_TKILL" + ", si_pid=%u, si_uid=%u}" + ", {si_signo=SIGALRM, si_code=SI_TKILL" + ", si_pid=%u, si_uid=%u}" + "]) = %ld\n", + (unsigned) pid, psi->off, psi->nr, + (unsigned) pid, (unsigned) uid, + (unsigned) pid, (unsigned) uid, + (unsigned) pid, (unsigned) uid, + rc); + } + + if (do_ptrace(PTRACE_CONT, pid, 0, 0)) { + saved = errno; + kill (pid, SIGKILL); + errno = saved; + perror_msg_and_fail("ptrace"); + } + printf("ptrace(PTRACE_CONT, %ld, NULL, SIG_0) = 0\n", pid); + } +} + +int +main(void) +{ + const unsigned long bad_request = + (unsigned long) 0xdeadbeeffacefeed; + const unsigned long bad_data = + (unsigned long) 0xdeadcafefacef00d; + const unsigned long pid = + (unsigned long) 0xdefaced00000000 | (unsigned) getpid(); + + unsigned int sigset_size; + + for (sigset_size = 1024 / 8; sigset_size; sigset_size >>= 1) { + if (!syscall(__NR_rt_sigprocmask, + SIG_SETMASK, NULL, NULL, sigset_size)) + break; + } + if (!sigset_size) + perror_msg_and_fail("rt_sigprocmask"); + + (void) tail_alloc(1); + void *const k_set = tail_alloc(sigset_size); + siginfo_t *const sip = tail_alloc(sizeof(*sip)); + (void) tail_alloc(1); + + long rc = do_ptrace(bad_request, pid, 0, 0); + printf("ptrace(%#lx /* PTRACE_??? */, %u, NULL, NULL) = %ld %s (%m)\n", + bad_request, (unsigned) pid, rc, errno2name()); + + rc = do_ptrace(PTRACE_PEEKDATA, pid, bad_request, bad_data); +# ifdef IA64 + printf("ptrace(PTRACE_PEEKDATA, %u, %#lx)" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, rc, errno2name()); +# else + printf("ptrace(PTRACE_PEEKDATA, %u, %#lx, %#lx)" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, bad_data, rc, errno2name()); +#endif + + rc = do_ptrace(PTRACE_PEEKTEXT, pid, bad_request, bad_data); +# ifdef IA64 + printf("ptrace(PTRACE_PEEKTEXT, %u, %#lx)" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, rc, errno2name()); +# else + printf("ptrace(PTRACE_PEEKTEXT, %u, %#lx, %#lx)" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, bad_data, rc, errno2name()); +#endif + + rc = do_ptrace(PTRACE_PEEKUSER, pid, bad_request, bad_data); +# ifdef IA64 + printf("ptrace(PTRACE_PEEKUSER, %u, %#lx)" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, rc, errno2name()); +# else + printf("ptrace(PTRACE_PEEKUSER, %u, %#lx, %#lx)" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, bad_data, rc, errno2name()); +#endif + + rc = do_ptrace(PTRACE_POKEUSER, pid, bad_request, bad_data); + printf("ptrace(PTRACE_POKEUSER, %u, %#lx, %#lx)" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, bad_data, rc, errno2name()); + + rc = do_ptrace(PTRACE_ATTACH, pid, 0, 0); + printf("ptrace(PTRACE_ATTACH, %u) = %ld %s (%m)\n", + (unsigned) pid, rc, errno2name()); + + rc = do_ptrace(PTRACE_INTERRUPT, pid, 0, 0); + printf("ptrace(PTRACE_INTERRUPT, %u) = %ld %s (%m)\n", + (unsigned) pid, rc, errno2name()); + + rc = do_ptrace(PTRACE_KILL, pid, 0, 0); + printf("ptrace(PTRACE_KILL, %u) = %ld %s (%m)\n", + (unsigned) pid, rc, errno2name()); + + rc = do_ptrace(PTRACE_LISTEN, pid, 0, 0); + printf("ptrace(PTRACE_LISTEN, %u) = %ld %s (%m)\n", + (unsigned) pid, rc, errno2name()); + + sigset_t libc_set; + sigemptyset(&libc_set); + sigaddset(&libc_set, SIGUSR1); + memcpy(k_set, &libc_set, sigset_size); + + rc = do_ptrace(PTRACE_SETSIGMASK, + pid, sigset_size, (unsigned long) k_set); + printf("ptrace(PTRACE_SETSIGMASK, %u, %u, [USR1])" + " = %ld %s (%m)\n", + (unsigned) pid, sigset_size, rc, errno2name()); + + rc = do_ptrace(PTRACE_GETSIGMASK, + pid, sigset_size, (unsigned long) k_set); + printf("ptrace(PTRACE_GETSIGMASK, %u, %u, %p)" + " = %ld %s (%m)\n", + (unsigned) pid, sigset_size, k_set, rc, errno2name()); + + rc = do_ptrace(PTRACE_SECCOMP_GET_FILTER, pid, 42, 0); + printf("ptrace(PTRACE_SECCOMP_GET_FILTER, %u, 42, NULL)" + " = %ld %s (%m)\n", (unsigned) pid, rc, errno2name()); + + rc = do_ptrace(PTRACE_GETEVENTMSG, pid, bad_request, bad_data); + printf("ptrace(PTRACE_GETEVENTMSG, %u, %#lx, %#lx)" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, bad_data, rc, errno2name()); + + memset(sip, -1, sizeof(*sip)); + sip->si_signo = SIGIO; + sip->si_code = 1; + sip->si_errno = ENOENT; + sip->si_band = -2; + + rc = do_ptrace(PTRACE_SETSIGINFO, + pid, bad_request, (unsigned long) sip); + printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGIO" + ", si_code=POLL_IN, si_errno=ENOENT, si_band=-2})" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, rc, errno2name()); + + memset(sip, -1, sizeof(*sip)); + sip->si_signo = SIGTRAP; + sip->si_code = 1; + sip->si_errno = ENOENT; + sip->si_pid = 2; + sip->si_uid = 3; + sip->si_ptr = (void *) bad_request; + + rc = do_ptrace(PTRACE_SETSIGINFO, + pid, bad_request, (unsigned long) sip); + printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGTRAP" + ", si_code=TRAP_BRKPT, si_errno=ENOENT, si_pid=2, si_uid=3" + ", si_value={int=%d, ptr=%p}}) = %ld %s (%m)\n", + (unsigned) pid, bad_request, sip->si_int, sip->si_ptr, rc, errno2name()); + + memset(sip, -1, sizeof(*sip)); + sip->si_signo = SIGILL; + sip->si_code = 1; + sip->si_errno = ENOENT; + sip->si_addr = (void *) (unsigned long) 0xfacefeeddeadbeef; + + rc = do_ptrace(PTRACE_SETSIGINFO, + pid, bad_request, (unsigned long) sip); + printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGILL" + ", si_code=ILL_ILLOPC, si_errno=ENOENT, si_addr=%p})" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, sip->si_addr, rc, errno2name()); + + memset(sip, -1, sizeof(*sip)); + sip->si_signo = SIGFPE; + sip->si_code = 1; + sip->si_errno = ENOENT; + sip->si_addr = (void *) (unsigned long) 0xfacefeeddeadbeef; + + rc = do_ptrace(PTRACE_SETSIGINFO, + pid, bad_request, (unsigned long) sip); + printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGFPE" + ", si_code=FPE_INTDIV, si_errno=ENOENT, si_addr=%p})" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, sip->si_addr, rc, errno2name()); + + memset(sip, -1, sizeof(*sip)); + sip->si_signo = SIGBUS; + sip->si_code = 1; + sip->si_errno = -2; + sip->si_addr = (void *) (unsigned long) 0xfacefeeddeadbeef; + + rc = do_ptrace(PTRACE_SETSIGINFO, + pid, bad_request, (unsigned long) sip); + printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGBUS" + ", si_code=BUS_ADRALN, si_errno=%d, si_addr=%p})" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, sip->si_errno, sip->si_addr, + rc, errno2name()); + + memset(sip, -1, sizeof(*sip)); + sip->si_signo = SIGPROF; + sip->si_code = 0xbadc0ded; + sip->si_errno = -2; + sip->si_pid = 0; + sip->si_uid = 3; + sip->si_ptr = 0; + + rc = do_ptrace(PTRACE_SETSIGINFO, + pid, bad_request, (unsigned long) sip); + printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGPROF" + ", si_code=%#x, si_errno=%d, si_pid=0, si_uid=3})" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, sip->si_code, sip->si_errno, + rc, errno2name()); + +#ifdef HAVE_SIGINFO_T_SI_SYSCALL + memset(sip, -1, sizeof(*sip)); + sip->si_signo = SIGSYS; + sip->si_code = 1; + sip->si_errno = ENOENT; + sip->si_call_addr = (void *) (unsigned long) 0xfacefeeddeadbeef; + sip->si_syscall = -1U; + sip->si_arch = AUDIT_ARCH_X86_64; + + rc = do_ptrace(PTRACE_SETSIGINFO, + pid, bad_request, (unsigned long) sip); + printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGSYS" + ", si_code=SYS_SECCOMP, si_errno=ENOENT, si_call_addr=%p" + ", si_syscall=__NR_syscall_%u, si_arch=AUDIT_ARCH_X86_64})" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, sip->si_call_addr, sip->si_syscall, + rc, errno2name()); +#endif + +#if defined HAVE_SIGINFO_T_SI_TIMERID && defined HAVE_SIGINFO_T_SI_OVERRUN + memset(sip, -1, sizeof(*sip)); + sip->si_signo = SIGHUP; + sip->si_code = SI_TIMER; + sip->si_errno = ENOENT; + sip->si_timerid = 0xdeadbeef; + sip->si_overrun = -1; + sip->si_ptr = (void *) (unsigned long) 0xfacefeeddeadbeef; + + rc = do_ptrace(PTRACE_SETSIGINFO, + pid, bad_request, (unsigned long) sip); + printf("ptrace(PTRACE_SETSIGINFO, %u, %#lx, {si_signo=SIGHUP" + ", si_code=SI_TIMER, si_errno=ENOENT, si_timerid=%#x" + ", si_overrun=%d, si_value={int=%d, ptr=%p}}) = %ld %s (%m)\n", + (unsigned) pid, bad_request, sip->si_timerid, sip->si_overrun, + sip->si_int, sip->si_ptr, rc, errno2name()); +#endif + + rc = do_ptrace(PTRACE_GETSIGINFO, + pid, bad_request, (unsigned long) sip); + printf("ptrace(PTRACE_GETSIGINFO, %u, %#lx, %p)" + " = %ld %s (%m)\n", (unsigned) pid, bad_request, sip, rc, errno2name()); + + rc = do_ptrace(PTRACE_CONT, pid, 0, SIGUSR1); + printf("ptrace(PTRACE_CONT, %u, NULL, SIGUSR1) = %ld %s (%m)\n", + (unsigned) pid, rc, errno2name()); + + rc = do_ptrace(PTRACE_DETACH, pid, 0, SIGUSR2); + printf("ptrace(PTRACE_DETACH, %u, NULL, SIGUSR2) = %ld %s (%m)\n", + (unsigned) pid, rc, errno2name()); + + rc = do_ptrace(PTRACE_SYSCALL, pid, 0, SIGUSR1); + printf("ptrace(PTRACE_SYSCALL, %u, NULL, SIGUSR1) = %ld %s (%m)\n", + (unsigned) pid, rc, errno2name()); + +#ifdef PTRACE_SINGLESTEP + rc = do_ptrace(PTRACE_SINGLESTEP, pid, 0, SIGUSR2); + printf("ptrace(PTRACE_SINGLESTEP, %u, NULL, SIGUSR2) = %ld %s (%m)\n", + (unsigned) pid, rc, errno2name()); +#endif + +#ifdef PTRACE_SINGLEBLOCK + rc = do_ptrace(PTRACE_SINGLEBLOCK, pid, 0, SIGUSR1); + printf("ptrace(PTRACE_SINGLEBLOCK, %u, NULL, SIGUSR1) = %ld %s (%m)\n", + (unsigned) pid, rc, errno2name()); +#endif + +#ifdef PTRACE_SYSEMU + rc = do_ptrace(PTRACE_SYSEMU, pid, 0, SIGUSR2); + printf("ptrace(PTRACE_SYSEMU, %u, NULL, SIGUSR2) = %ld %s (%m)\n", + (unsigned) pid, rc, errno2name()); +#endif +#ifdef PTRACE_SYSEMU_SINGLESTEP + rc = do_ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, SIGUSR1); + printf("ptrace(PTRACE_SYSEMU_SINGLESTEP, %u, NULL, SIGUSR1)" + " = %ld %s (%m)\n", (unsigned) pid, rc, errno2name()); +#endif + + rc = do_ptrace(PTRACE_SETOPTIONS, + pid, 0, PTRACE_O_TRACEFORK|PTRACE_O_TRACECLONE); + printf("ptrace(PTRACE_SETOPTIONS, %u, NULL" + ", PTRACE_O_TRACEFORK|PTRACE_O_TRACECLONE) = %ld %s (%m)\n", + (unsigned) pid, rc, errno2name()); + + rc = do_ptrace(PTRACE_SEIZE, + pid, bad_request, PTRACE_O_TRACESYSGOOD); + printf("ptrace(PTRACE_SEIZE, %u, %#lx" + ", PTRACE_O_TRACESYSGOOD) = %ld %s (%m)\n", + (unsigned) pid, bad_request, rc, errno2name()); + + rc = do_ptrace(PTRACE_SETREGSET, pid, 1, bad_request); + printf("ptrace(PTRACE_SETREGSET, %u, NT_PRSTATUS, %#lx)" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, rc, errno2name()); + + rc = do_ptrace(PTRACE_GETREGSET, pid, 3, bad_request); + printf("ptrace(PTRACE_GETREGSET, %u, NT_PRPSINFO, %#lx)" + " = %ld %s (%m)\n", + (unsigned) pid, bad_request, rc, errno2name()); + + test_peeksiginfo(pid, bad_request); + + rc = do_ptrace(PTRACE_TRACEME, 0, 0, 0); + if (rc) + printf("ptrace(PTRACE_TRACEME) = %ld %s (%m)\n", + rc, errno2name()); + else + printf("ptrace(PTRACE_TRACEME) = 0\n"); + + puts("+++ exited with 0 +++"); + return 0; +} + + +#else + +SKIP_MAIN_UNDEFINED("__NR_rt_sigprocmask") + +#endif diff --git a/tests/ptrace.test b/tests/ptrace.test new file mode 100755 index 00000000..5add9be4 --- /dev/null +++ b/tests/ptrace.test @@ -0,0 +1,6 @@ +#!/bin/sh + +# Check decoding of ptrace syscall. + +. "${srcdir=.}/init.sh" +run_strace_match_diff -a23 -e signal=none