1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2018 Dmitry V. Levin <ldv@altlinux.org>
6 * Check whether PTRACE_GET_SYSCALL_INFO semantics implemented in the kernel
7 * matches userspace expectations.
10 #include "../kselftest_harness.h"
13 #include <asm/unistd.h>
14 #include "linux/ptrace.h"
17 kill_tracee(pid_t pid)
22 int saved_errno = errno;
24 int rc = kill(pid, SIGKILL);
31 sys_ptrace(int request, pid_t pid, unsigned long addr, unsigned long data)
33 return syscall(__NR_ptrace, request, pid, addr, data);
36 #define LOG_KILL_TRACEE(fmt, ...) \
39 TH_LOG("wait #%d: " fmt, \
40 ptrace_stop, ##__VA_ARGS__); \
43 TEST(get_syscall_info)
45 static const unsigned long args[][7] = {
46 /* a sequence of architecture-agnostic syscalls */
75 const unsigned long *exp_args;
84 /* get the pid before PTRACE_TRACEME */
86 ASSERT_EQ(0, sys_ptrace(PTRACE_TRACEME, 0, 0, 0)) {
87 TH_LOG("PTRACE_TRACEME: %m");
89 ASSERT_EQ(0, kill(pid, SIGSTOP)) {
91 TH_LOG("kill SIGSTOP: %m");
93 for (unsigned int i = 0; i < ARRAY_SIZE(args); ++i) {
95 args[i][1], args[i][2], args[i][3],
96 args[i][4], args[i][5], args[i][6]);
103 unsigned int is_error;
105 } *exp_param, exit_param[] = {
106 { 1, -ENOENT }, /* chdir */
107 { 0, pid } /* gettid */
110 unsigned int ptrace_stop;
112 for (ptrace_stop = 0; ; ++ptrace_stop) {
113 struct ptrace_syscall_info info = {
114 .op = 0xff /* invalid PTRACE_SYSCALL_INFO_* op */
116 const size_t size = sizeof(info);
117 const int expected_none_size =
118 (void *) &info.entry - (void *) &info;
119 const int expected_entry_size =
120 (void *) &info.entry.args[6] - (void *) &info;
121 const int expected_exit_size =
122 (void *) (&info.exit.is_error + 1) -
127 ASSERT_EQ(pid, wait(&status)) {
129 LOG_KILL_TRACEE("wait: %m");
131 if (WIFEXITED(status)) {
132 pid = 0; /* the tracee is no more */
133 ASSERT_EQ(0, WEXITSTATUS(status));
136 ASSERT_FALSE(WIFSIGNALED(status)) {
137 pid = 0; /* the tracee is no more */
138 LOG_KILL_TRACEE("unexpected signal %u",
141 ASSERT_TRUE(WIFSTOPPED(status)) {
143 LOG_KILL_TRACEE("unexpected wait status %#x", status);
146 switch (WSTOPSIG(status)) {
148 ASSERT_EQ(0, ptrace_stop) {
149 LOG_KILL_TRACEE("unexpected signal stop");
151 ASSERT_EQ(0, sys_ptrace(PTRACE_SETOPTIONS, pid, 0,
152 PTRACE_O_TRACESYSGOOD)) {
153 LOG_KILL_TRACEE("PTRACE_SETOPTIONS: %m");
155 ASSERT_LT(0, (rc = sys_ptrace(PTRACE_GET_SYSCALL_INFO,
157 (unsigned long) &info))) {
158 LOG_KILL_TRACEE("PTRACE_GET_SYSCALL_INFO: %m");
160 ASSERT_EQ(expected_none_size, rc) {
161 LOG_KILL_TRACEE("signal stop mismatch");
163 ASSERT_EQ(PTRACE_SYSCALL_INFO_NONE, info.op) {
164 LOG_KILL_TRACEE("signal stop mismatch");
166 ASSERT_TRUE(info.arch) {
167 LOG_KILL_TRACEE("signal stop mismatch");
169 ASSERT_TRUE(info.instruction_pointer) {
170 LOG_KILL_TRACEE("signal stop mismatch");
172 ASSERT_TRUE(info.stack_pointer) {
173 LOG_KILL_TRACEE("signal stop mismatch");
178 ASSERT_LT(0, (rc = sys_ptrace(PTRACE_GET_SYSCALL_INFO,
180 (unsigned long) &info))) {
181 LOG_KILL_TRACEE("PTRACE_GET_SYSCALL_INFO: %m");
183 switch (ptrace_stop) {
184 case 1: /* entering chdir */
185 case 3: /* entering gettid */
186 case 5: /* entering exit_group */
187 exp_args = args[ptrace_stop / 2];
188 ASSERT_EQ(expected_entry_size, rc) {
189 LOG_KILL_TRACEE("entry stop mismatch");
191 ASSERT_EQ(PTRACE_SYSCALL_INFO_ENTRY, info.op) {
192 LOG_KILL_TRACEE("entry stop mismatch");
194 ASSERT_TRUE(info.arch) {
195 LOG_KILL_TRACEE("entry stop mismatch");
197 ASSERT_TRUE(info.instruction_pointer) {
198 LOG_KILL_TRACEE("entry stop mismatch");
200 ASSERT_TRUE(info.stack_pointer) {
201 LOG_KILL_TRACEE("entry stop mismatch");
203 ASSERT_EQ(exp_args[0], info.entry.nr) {
204 LOG_KILL_TRACEE("entry stop mismatch");
206 ASSERT_EQ(exp_args[1], info.entry.args[0]) {
207 LOG_KILL_TRACEE("entry stop mismatch");
209 ASSERT_EQ(exp_args[2], info.entry.args[1]) {
210 LOG_KILL_TRACEE("entry stop mismatch");
212 ASSERT_EQ(exp_args[3], info.entry.args[2]) {
213 LOG_KILL_TRACEE("entry stop mismatch");
215 ASSERT_EQ(exp_args[4], info.entry.args[3]) {
216 LOG_KILL_TRACEE("entry stop mismatch");
218 ASSERT_EQ(exp_args[5], info.entry.args[4]) {
219 LOG_KILL_TRACEE("entry stop mismatch");
221 ASSERT_EQ(exp_args[6], info.entry.args[5]) {
222 LOG_KILL_TRACEE("entry stop mismatch");
225 case 2: /* exiting chdir */
226 case 4: /* exiting gettid */
227 exp_param = &exit_param[ptrace_stop / 2 - 1];
228 ASSERT_EQ(expected_exit_size, rc) {
229 LOG_KILL_TRACEE("exit stop mismatch");
231 ASSERT_EQ(PTRACE_SYSCALL_INFO_EXIT, info.op) {
232 LOG_KILL_TRACEE("exit stop mismatch");
234 ASSERT_TRUE(info.arch) {
235 LOG_KILL_TRACEE("exit stop mismatch");
237 ASSERT_TRUE(info.instruction_pointer) {
238 LOG_KILL_TRACEE("exit stop mismatch");
240 ASSERT_TRUE(info.stack_pointer) {
241 LOG_KILL_TRACEE("exit stop mismatch");
243 ASSERT_EQ(exp_param->is_error,
244 info.exit.is_error) {
245 LOG_KILL_TRACEE("exit stop mismatch");
247 ASSERT_EQ(exp_param->rval, info.exit.rval) {
248 LOG_KILL_TRACEE("exit stop mismatch");
252 LOG_KILL_TRACEE("unexpected syscall stop");
258 LOG_KILL_TRACEE("unexpected stop signal %#x",
263 ASSERT_EQ(0, sys_ptrace(PTRACE_SYSCALL, pid, 0, 0)) {
264 LOG_KILL_TRACEE("PTRACE_SYSCALL: %m");
268 ASSERT_EQ(ARRAY_SIZE(args) * 2, ptrace_stop);