Attachment 926075 Details for Bug 1113143 – Stripped down reproducer

Stripped down reproducer

test.c (text/plain), 1.25 KB, created by Jaroslav Škarvada on 2014-08-12 13:47:42 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Jaroslav Škarvada

Created: 2014-08-12 13:47:42 UTC

Size: 1.25 KB

patch

obsolete

>#define _GNU_SOURCE
>#include <stdlib.h>
>#include <stdio.h>
>#include <sys/types.h>
>#include <sys/stat.h>
>#include <sys/wait.h>
>#include <fcntl.h>
>#include <unistd.h>
>#include <sched.h>
>#include <fcntl.h>
>
>#define STACK_SIZE 16384
>
>pid_t ctid1, ctid2, pid1, pid2;
>int fd;
>char *stack1, *stack2, *stacktop1, *stacktop2;
>char loop = 0;
>char buf[256] = {0};
>
>int a()
>{
>  dup2(fd, 2);
>  write(2, "error msg1\n", 11);
>}
>
>int b()
>{
>  dup2(fd, 2);
>  write(2, "error msg2\n", 11);
>}
>
>int main(int argc, char argv[])
>{
>  stack1 = malloc(STACK_SIZE);
>  stack2 = malloc(STACK_SIZE);
>  stacktop1 = stack1 + STACK_SIZE;
>  stacktop2 = stack2 + STACK_SIZE;
>  do
>  {
>    unlink("/tmp/tclaVlnpC");
>    fd = open("/tmp/tclaVlnpC", O_RDWR | O_CREAT | O_EXCL, 0600);
>    if (fd < 0)
>    {
>      printf("open failed\n");
>      return 1;
>    }
>    fcntl(fd, F_SETFD, FD_CLOEXEC);
>    pid1 = clone(a, stacktop1, CLONE_CHILD_CLEARTID | CLONE_CHILD_SETTID | SIGCHLD, NULL, NULL, NULL, &ctid1);
>    pid2 = clone(b, stacktop2, CLONE_CHILD_CLEARTID | CLONE_CHILD_SETTID | SIGCHLD, NULL, NULL, NULL, &ctid1);
>    waitpid(pid1, NULL, 0);
>    waitpid(pid2, NULL, 0);
>    lseek(fd, 0, SEEK_SET);
>    loop = read(fd, buf, 22) == 22;
>    close(fd);
>  }
>  while (loop);
>  free(stack1);
>  free(stack2);
>  return 0;
>}

Actions: View

Attachments on bug 1113143: 926075 | 928482 | 928486