Attachment 223861 Details for Bug 285761 – enhanced test case

enhanced test case

ptrace-exit-vs-proc-maps.c (text/plain), 2.71 KB, created by Roland McGrath on 2007-10-11 04:10:15 UTC

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Filename:

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Creator: Roland McGrath

Created: 2007-10-11 04:10:15 UTC

Size: 2.71 KB

patch

obsolete

>#include <stdlib.h>
>#include <stdio.h>
>#include <limits.h>
>#include <unistd.h>
>#include <sys/wait.h>
>#include <sys/ptrace.h>
>#include <linux/ptrace.h>
>#include <fcntl.h>
>#include <errno.h>
>#include <string.h>
>#include <assert.h>
>#include <sys/stat.h>
>
>#define PTRACE_EVENT(status) ((status) >> 16)
>
>int
>main(int argc, char **argv)
>{
>    pid_t pid = fork();
>    assert(pid != -1);
>
>    if (pid == 0) {
>        /* Child processes, wait a second for the parent to attach. */
>        sleep(1);
>
>        kill(getpid(), SIGABRT);
>        //exit(0);
>    }
>    else {
>        long res;
>        int status;
>
>        /* Attach to the child process. */
>        res = ptrace(PTRACE_ATTACH, pid, NULL, NULL);
>        assert(res != -1);
>
>        res = waitpid(pid, &status, __WALL);
>        assert(res == pid);
>
>        res = ptrace(PTRACE_SETOPTIONS, pid, NULL, PTRACE_O_TRACEEXIT);
>        assert(res != -1);
>
>        res = ptrace(PTRACE_CONT, pid, NULL, (void *)0);
>        assert(res != -1);
>
>        /* Trace the child process until it has exited. */
>        int exited = 0;
>        do {
>            res = waitpid(pid, &status, __WALL);
>            assert(res == pid);
>
>            if (WIFSTOPPED(status)) {
>                if (PTRACE_EVENT(status) == PTRACE_EVENT_EXIT) {
>                    char maps[PATH_MAX];
>                    sprintf(maps, "/proc/%d/maps", pid);
>		    struct stat st;
>		    if (stat(maps, &st) == 0)
>		      printf("%s has uid %u and mode %04o\n",
>			     maps, st.st_uid, st.st_mode&07777);
>                    int status_fd = open(maps, O_RDONLY);
>                    if (status_fd == -1) {
>		      printf("Failed to open %s: error %d, %s\n",
>			     maps, errno, strerror(errno));
>		      //raise(SIGSTOP);
>		    }
>                    else {
>                        char buf[0x1000];
>                        res = read(status_fd, buf, sizeof(buf) - 1);
>			if (res == -1)
>			  printf("Failed to read %s: error %d, %s\n",
>				 maps, errno, strerror(errno));
>			else {
>			  assert(res != -1);
>			  buf[res] = '\0';
>			  printf("%s", buf);
>			}
>                        res = close(status_fd);
>                        assert(res != -1);
>                    }
>
>                    res = ptrace(PTRACE_CONT, pid, NULL, (void *)0);
>                    assert(res != -1);
>                }
>                else if (PTRACE_EVENT(status) == 0) {
>                    res = ptrace(PTRACE_CONT, pid, NULL,
>                                 (void *)(long)WSTOPSIG(status));
>                    assert(res != -1);
>                }
>                else
>                    assert(0);
>            } else if (WIFEXITED(status) || WIFSIGNALED(status))
>                exited = 1;
>            else
>                assert(0);
>        } while (!exited);
>    }
>
>    return 0;
>}

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Attachments on bug 285761: 192401 | 223861