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