-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
exec selftests: test ->recursion_depth
Test that trivially recursing script onto itself doesn't work. Note: this is different test from ELOOP tests in execveat.c Those test that execveat(2) doesn't follow symlinks when told to do so. Link: http://lkml.kernel.org/r/20190423192720.GA21433@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
- Loading branch information
Alexey Dobriyan
authored and
Linus Torvalds
committed
May 15, 2019
1 parent
a6231d1
commit 4e7301e
Showing
3 changed files
with
73 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
|
@@ -6,4 +6,5 @@ execveat.moved | |
execveat.path.ephemeral | ||
execveat.ephemeral | ||
execveat.denatured | ||
xxxxxxxx* | ||
/recursion-depth | ||
xxxxxxxx* |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,67 @@ | ||
/* | ||
* 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; | ||
} |