test: ptrace: Record syscall return value before reporting
Change-Id: I8e9de3bb9bfa0b07eebe472131cc62b53ef5cc8b Refs: #1287
This commit is contained in:
Shiratori, Takehiro
committed by
Masamichi Takagi
Masamichi Takagi
parent
7c69cfaf67
commit
33cba1ad48
259
test/issues/1287/arm64/1287_arm64.c
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259
test/issues/1287/arm64/1287_arm64.c
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@@ -0,0 +1,259 @@
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/* 1287_arm64.c COPYRIGHT FUJITSU LIMITED 2019 */
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/* ptrace(PTRACE_SYSCALL) args and ret check testcase */
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ptrace.h>
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#include <errno.h>
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#include <sys/uio.h>
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#include <asm/ptrace.h>
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#include <linux/elf.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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static unsigned long __inst_addr;
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#define SYSCALL_ARG0 0x11111111
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#define SYSCALL_ARG1 0x22222222
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#define SYSCALL_ARG2 0x33333333
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#define SYSCALL_ARG3 0x44444444
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#define SYSCALL_ARG4 0x55555555
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#define SYSCALL_ARG5 0x66666666
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#define NOP_INST 0xd503201fUL
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static int rewrite_brk_inst(pid_t cpid, void *inst_addr)
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{
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unsigned long addr = 0;
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const unsigned long inst = ((NOP_INST << 32UL) | NOP_INST);
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/* read child brk address */
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addr = ptrace(PTRACE_PEEKDATA, cpid, inst_addr, NULL);
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if ((addr == -1) && errno) {
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perror("ptrace(PTRACE_PEEKDATA)");
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return -1;
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}
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/* write nop instruction */
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if (ptrace(PTRACE_POKETEXT, cpid, addr, inst)) {
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perror("ptrace(PTRACE_POKETEXT)");
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return -1;
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}
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return 0;
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}
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static int get_check_regs(pid_t cpid, int regnum, long exp)
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{
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int ret = -1;
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struct iovec iov;
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struct user_pt_regs gregs;
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if (regnum < 0 || 30 < regnum) {
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printf("regnum=%d invalid. (0 <= regnum <= 30)\n", regnum);
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goto out;
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}
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/* read child regs (REGSET_GPR) */
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iov.iov_base = &gregs;
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iov.iov_len = sizeof(gregs);
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if (ptrace(PTRACE_GETREGSET, cpid, NT_PRSTATUS, &iov)) {
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perror("ptrace(PTRACE_GETREGSET, NT_PRSTATUS)");
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goto out;
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}
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/* check */
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if (gregs.regs[regnum] != exp) {
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printf("reg[%d] check NG.\n", regnum);
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printf("expection:0x%lx readsysno:0x%llx\n",
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exp, gregs.regs[regnum]);
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goto out;
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}
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/* success */
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ret = 0;
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out:
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return ret;
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}
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static int child_func(void)
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{
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int ret = -1;
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/* send PTRACE_TRACEME */
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if (ptrace(PTRACE_TRACEME, 0, NULL, NULL)) {
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perror("ptrace(PTRACE_TRACEME)");
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goto out;
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}
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/* stop mine, brk instruction */
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/* rewrite nop from parent process */
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asm volatile(
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"adr x10, 1f\n"
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"str x10, [%0]\n"
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"nop\n"
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"nop\n"
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"1:\n"
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"brk #0\n"
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"nop\n"
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: /* nothing */
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: "r"(&__inst_addr)
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: "x10"
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);
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/* send magicno syscall */
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syscall(__NR_getpid, SYSCALL_ARG0, SYSCALL_ARG1, SYSCALL_ARG2,
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SYSCALL_ARG3, SYSCALL_ARG4, SYSCALL_ARG5);
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/* success */
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ret = 0;
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out:
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return ret;
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}
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static int parent_func(pid_t cpid)
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{
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pid_t pid = 0;
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int status = 0;
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int ret = -1;
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int i = 0;
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const long syscall_args[] = {
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SYSCALL_ARG0, SYSCALL_ARG1, SYSCALL_ARG2,
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SYSCALL_ARG3, SYSCALL_ARG4, SYSCALL_ARG5
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};
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/* wait child stop */
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pid = wait(&status);
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if (pid == cpid) {
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if (!WIFSTOPPED(status)) {
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printf("child is not stopped.\n");
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goto out;
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}
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}
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else {
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perror("wait()");
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goto out;
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}
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/* rewrite child brk instruction */
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if (rewrite_brk_inst(cpid, &__inst_addr)) {
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goto cont;
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}
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/* child continue (until next syscall enter) */
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if (ptrace(PTRACE_SYSCALL, cpid, NULL, NULL)) {
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perror("ptrace(PTRACE_SYSCALL)");
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goto cont;
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}
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/* wait child stop */
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pid = wait(&status);
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if (pid == cpid) {
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if (!WIFSTOPPED(status)) {
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printf("child is not stopped.\n");
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goto out;
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}
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}
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else {
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perror("wait()");
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goto out;
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}
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/* check syscall arguments */
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for (i = 0; i < sizeof(syscall_args) /
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sizeof(syscall_args[0]); i++) {
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if (get_check_regs(cpid, i, syscall_args[i]) != 0) {
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printf("syscall enter regs[%d] NG.\n", i);
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goto out;
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}
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}
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/* child continue (until syscall exit) */
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if (ptrace(PTRACE_SYSCALL, cpid, NULL, NULL)) {
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perror("ptrace(PTRACE_SYSCALL)");
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goto cont;
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}
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/* wait child stop */
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pid = wait(&status);
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if (pid == cpid) {
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if (!WIFSTOPPED(status)) {
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printf("child is not stopped.\n");
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goto out;
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}
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}
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else {
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perror("wait()");
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goto out;
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}
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/* check syscall return */
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if (get_check_regs(cpid, 0, cpid) != 0) {
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printf("syscall exit return val NG.\n");
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goto cont;
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}
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/* success */
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ret = 0;
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cont:
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/* child continue */
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if (ptrace(PTRACE_CONT, cpid, NULL, NULL)) {
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perror("ptrace(PTRACE_CONT)");
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ret = -1;
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}
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out:
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return ret;
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}
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int main(int argc, char *argv[])
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{
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pid_t pid = 0;
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int ret = -1;
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int func_ret = 0;
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int status = 0;
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/* create child process */
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pid = fork();
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switch (pid) {
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case -1:
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/* fork() error. */
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perror("fork()");
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goto out;
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case 0:
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/* child process */
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func_ret = child_func();
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/* child exit */
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exit(func_ret);
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break;
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default:
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/* parent process */
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func_ret = parent_func(pid);
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/* wait child */
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pid = wait(&status);
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if (pid != -1) {
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if (WEXITSTATUS(status)) {
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printf("WEXITSTATUS() is not 0.\n");
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goto out;
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}
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}
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else {
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perror("wait()");
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goto out;
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}
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/* parent_func check */
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if (func_ret) {
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goto out;
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}
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break;
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}
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/* sccess. */
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ret = 0;
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out:
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return ret;
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}
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