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exec selftests: test ->recursion_depth

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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>
This commit is contained in:
Alexey Dobriyan 2019-05-14 15:44:43 -07:00 committed by Linus Torvalds
parent a6231d1993
commit 4e7301e6df
3 changed files with 73 additions and 1 deletions
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3
tools/testing/selftests/exec/.gitignore vendored
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@ -6,4 +6,5 @@ execveat.moved
execveat.path.ephemeral
execveat.ephemeral
execveat.denatured
xxxxxxxx*
/recursion-depth
xxxxxxxx*

4
tools/testing/selftests/exec/Makefile
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@ -1,11 +1,15 @@
# SPDX-License-Identifier: GPL-2.0
CFLAGS = -Wall
CFLAGS += -Wno-nonnull
CFLAGS += -D_GNU_SOURCE
TEST_GEN_PROGS := execveat
TEST_GEN_FILES := execveat.symlink execveat.denatured script subdir
# Makefile is a run-time dependency, since it's accessed by the execveat test
TEST_FILES := Makefile
TEST_GEN_PROGS += recursion-depth
EXTRA_CLEAN := $(OUTPUT)/subdir.moved $(OUTPUT)/execveat.moved $(OUTPUT)/xxxxx*
include ../lib.mk

67
tools/testing/selftests/exec/recursion-depth.c Normal file
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@ -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;
}