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/*
* Copyright (c) 2019 Alexey Dobriyan <adobriyan@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* Test that pointing #! script interpreter to self doesn't recurse. */
#include <errno.h>
#include <sched.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mount.h>
#include <unistd.h>
int main(void)
{
if (unshare(CLONE_NEWNS) == -1) {
if (errno == ENOSYS || errno == EPERM) {
fprintf(stderr, "error: unshare, errno %d\n", errno);
return 4;
}
fprintf(stderr, "error: unshare, errno %d\n", errno);
return 1;
}
if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) == -1) {
fprintf(stderr, "error: mount '/', errno %d\n", errno);
return 1;
}
/* Require "exec" filesystem. */
if (mount(NULL, "/tmp", "ramfs", 0, NULL) == -1) {
fprintf(stderr, "error: mount ramfs, errno %d\n", errno);
return 1;
}
#define FILENAME "/tmp/1"
int fd = creat(FILENAME, 0700);
if (fd == -1) {
fprintf(stderr, "error: creat, errno %d\n", errno);
return 1;
}
#define S "#!" FILENAME "\n"
if (write(fd, S, strlen(S)) != strlen(S)) {
fprintf(stderr, "error: write, errno %d\n", errno);
return 1;
}
close(fd);
int rv = execve(FILENAME, NULL, NULL);
if (rv == -1 && errno == ELOOP) {
return 0;
}
fprintf(stderr, "error: execve, rv %d, errno %d\n", rv, errno);
return 1;
}
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