selftests/ptrace: add a test case for PTRACE_GET_SYSCALL_INFO
Check whether PTRACE_GET_SYSCALL_INFO semantics implemented in the kernel matches userspace expectations. [akpm@linux-foundation.org: coding-style fixes] Link: http://lkml.kernel.org/r/20190510152852.GG28558@altlinux.org Signed-off-by: Dmitry V. Levin <ldv@altlinux.org> Acked-by: Shuah Khan <shuah@kernel.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Elvira Khabirova <lineprinter@altlinux.org> Cc: Eugene Syromyatnikov <esyr@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Greentime Hu <greentime@andestech.com> Cc: Helge Deller <deller@gmx.de> [parisc] Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: James Hogan <jhogan@kernel.org> Cc: kbuild test robot <lkp@intel.com> Cc: Kees Cook <keescook@chromium.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Burton <paul.burton@mips.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Vincent Chen <deanbo422@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dmitry V. Levin
Linus Torvalds
parent
201766a20e
commit
ac76de555d
1
tools/testing/selftests/ptrace/.gitignore
vendored
1
tools/testing/selftests/ptrace/.gitignore
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@ -1 +1,2 @@
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get_syscall_info
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peeksiginfo
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@ -1,6 +1,6 @@
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# SPDX-License-Identifier: GPL-2.0-only
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CFLAGS += -iquote../../../../include/uapi -Wall
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TEST_GEN_PROGS := peeksiginfo
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TEST_GEN_PROGS := get_syscall_info peeksiginfo
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include ../lib.mk
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271
tools/testing/selftests/ptrace/get_syscall_info.c
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271
tools/testing/selftests/ptrace/get_syscall_info.c
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@ -0,0 +1,271 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2018 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Check whether PTRACE_GET_SYSCALL_INFO semantics implemented in the kernel
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* matches userspace expectations.
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*/
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#include "../kselftest_harness.h"
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#include <err.h>
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#include <signal.h>
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#include <asm/unistd.h>
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#include "linux/ptrace.h"
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static int
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kill_tracee(pid_t pid)
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{
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if (!pid)
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return 0;
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int saved_errno = errno;
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int rc = kill(pid, SIGKILL);
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errno = saved_errno;
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return rc;
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}
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static long
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sys_ptrace(int request, pid_t pid, 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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#define LOG_KILL_TRACEE(fmt, ...) \
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do { \
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kill_tracee(pid); \
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TH_LOG("wait #%d: " fmt, \
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ptrace_stop, ##__VA_ARGS__); \
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} while (0)
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TEST(get_syscall_info)
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{
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static const unsigned long args[][7] = {
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/* a sequence of architecture-agnostic syscalls */
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{
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__NR_chdir,
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(unsigned long) "",
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0xbad1fed1,
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0xbad2fed2,
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0xbad3fed3,
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0xbad4fed4,
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0xbad5fed5
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},
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{
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__NR_gettid,
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0xcaf0bea0,
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0xcaf1bea1,
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0xcaf2bea2,
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0xcaf3bea3,
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0xcaf4bea4,
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0xcaf5bea5
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},
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{
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__NR_exit_group,
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0,
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0xfac1c0d1,
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0xfac2c0d2,
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0xfac3c0d3,
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0xfac4c0d4,
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0xfac5c0d5
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}
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};
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const unsigned long *exp_args;
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pid_t pid = fork();
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ASSERT_LE(0, pid) {
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TH_LOG("fork: %m");
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}
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if (pid == 0) {
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/* get the pid before PTRACE_TRACEME */
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pid = getpid();
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ASSERT_EQ(0, sys_ptrace(PTRACE_TRACEME, 0, 0, 0)) {
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TH_LOG("PTRACE_TRACEME: %m");
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}
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ASSERT_EQ(0, kill(pid, SIGSTOP)) {
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/* cannot happen */
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TH_LOG("kill SIGSTOP: %m");
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}
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for (unsigned int i = 0; i < ARRAY_SIZE(args); ++i) {
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syscall(args[i][0],
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args[i][1], args[i][2], args[i][3],
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args[i][4], args[i][5], args[i][6]);
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}
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/* unreachable */
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_exit(1);
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}
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const struct {
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unsigned int is_error;
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int rval;
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} *exp_param, exit_param[] = {
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{ 1, -ENOENT }, /* chdir */
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{ 0, pid } /* gettid */
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};
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unsigned int ptrace_stop;
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for (ptrace_stop = 0; ; ++ptrace_stop) {
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struct ptrace_syscall_info info = {
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.op = 0xff /* invalid PTRACE_SYSCALL_INFO_* op */
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};
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const size_t size = sizeof(info);
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const int expected_none_size =
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(void *) &info.entry - (void *) &info;
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const int expected_entry_size =
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(void *) &info.entry.args[6] - (void *) &info;
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const int expected_exit_size =
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(void *) (&info.exit.is_error + 1) -
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(void *) &info;
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int status;
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long rc;
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ASSERT_EQ(pid, wait(&status)) {
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/* cannot happen */
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LOG_KILL_TRACEE("wait: %m");
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}
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if (WIFEXITED(status)) {
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pid = 0; /* the tracee is no more */
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ASSERT_EQ(0, WEXITSTATUS(status));
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break;
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}
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ASSERT_FALSE(WIFSIGNALED(status)) {
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pid = 0; /* the tracee is no more */
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LOG_KILL_TRACEE("unexpected signal %u",
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WTERMSIG(status));
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}
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ASSERT_TRUE(WIFSTOPPED(status)) {
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/* cannot happen */
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LOG_KILL_TRACEE("unexpected wait status %#x", status);
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}
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switch (WSTOPSIG(status)) {
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case SIGSTOP:
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ASSERT_EQ(0, ptrace_stop) {
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LOG_KILL_TRACEE("unexpected signal stop");
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}
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ASSERT_EQ(0, sys_ptrace(PTRACE_SETOPTIONS, pid, 0,
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PTRACE_O_TRACESYSGOOD)) {
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LOG_KILL_TRACEE("PTRACE_SETOPTIONS: %m");
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}
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ASSERT_LT(0, (rc = sys_ptrace(PTRACE_GET_SYSCALL_INFO,
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pid, size,
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(unsigned long) &info))) {
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LOG_KILL_TRACEE("PTRACE_GET_SYSCALL_INFO: %m");
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}
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ASSERT_EQ(expected_none_size, rc) {
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LOG_KILL_TRACEE("signal stop mismatch");
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}
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ASSERT_EQ(PTRACE_SYSCALL_INFO_NONE, info.op) {
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LOG_KILL_TRACEE("signal stop mismatch");
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}
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ASSERT_TRUE(info.arch) {
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LOG_KILL_TRACEE("signal stop mismatch");
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}
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ASSERT_TRUE(info.instruction_pointer) {
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LOG_KILL_TRACEE("signal stop mismatch");
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}
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ASSERT_TRUE(info.stack_pointer) {
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LOG_KILL_TRACEE("signal stop mismatch");
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}
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break;
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case SIGTRAP | 0x80:
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ASSERT_LT(0, (rc = sys_ptrace(PTRACE_GET_SYSCALL_INFO,
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pid, size,
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(unsigned long) &info))) {
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LOG_KILL_TRACEE("PTRACE_GET_SYSCALL_INFO: %m");
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}
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switch (ptrace_stop) {
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case 1: /* entering chdir */
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case 3: /* entering gettid */
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case 5: /* entering exit_group */
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exp_args = args[ptrace_stop / 2];
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ASSERT_EQ(expected_entry_size, rc) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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ASSERT_EQ(PTRACE_SYSCALL_INFO_ENTRY, info.op) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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ASSERT_TRUE(info.arch) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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ASSERT_TRUE(info.instruction_pointer) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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ASSERT_TRUE(info.stack_pointer) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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ASSERT_EQ(exp_args[0], info.entry.nr) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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ASSERT_EQ(exp_args[1], info.entry.args[0]) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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ASSERT_EQ(exp_args[2], info.entry.args[1]) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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ASSERT_EQ(exp_args[3], info.entry.args[2]) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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ASSERT_EQ(exp_args[4], info.entry.args[3]) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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ASSERT_EQ(exp_args[5], info.entry.args[4]) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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ASSERT_EQ(exp_args[6], info.entry.args[5]) {
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LOG_KILL_TRACEE("entry stop mismatch");
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}
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break;
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case 2: /* exiting chdir */
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case 4: /* exiting gettid */
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exp_param = &exit_param[ptrace_stop / 2 - 1];
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ASSERT_EQ(expected_exit_size, rc) {
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LOG_KILL_TRACEE("exit stop mismatch");
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}
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ASSERT_EQ(PTRACE_SYSCALL_INFO_EXIT, info.op) {
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LOG_KILL_TRACEE("exit stop mismatch");
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}
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ASSERT_TRUE(info.arch) {
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LOG_KILL_TRACEE("exit stop mismatch");
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}
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ASSERT_TRUE(info.instruction_pointer) {
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LOG_KILL_TRACEE("exit stop mismatch");
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}
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ASSERT_TRUE(info.stack_pointer) {
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LOG_KILL_TRACEE("exit stop mismatch");
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}
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ASSERT_EQ(exp_param->is_error,
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info.exit.is_error) {
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LOG_KILL_TRACEE("exit stop mismatch");
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}
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ASSERT_EQ(exp_param->rval, info.exit.rval) {
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LOG_KILL_TRACEE("exit stop mismatch");
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}
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break;
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default:
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LOG_KILL_TRACEE("unexpected syscall stop");
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abort();
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}
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break;
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default:
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LOG_KILL_TRACEE("unexpected stop signal %#x",
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WSTOPSIG(status));
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abort();
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}
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ASSERT_EQ(0, sys_ptrace(PTRACE_SYSCALL, pid, 0, 0)) {
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LOG_KILL_TRACEE("PTRACE_SYSCALL: %m");
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}
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}
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ASSERT_EQ(ARRAY_SIZE(args) * 2, ptrace_stop);
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}
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TEST_HARNESS_MAIN
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