From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c | 67 ++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c (limited to 'tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c') diff --git a/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c b/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c new file mode 100644 index 000000000..b5c3ddb90 --- /dev/null +++ b/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c @@ -0,0 +1,67 @@ +/* + * Copyright (c) 2019 Alexey Dobriyan + * + * 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 open(O_TMPFILE), linkat() doesn't screw accounting. */ +#include +#include +#include +#include +#include +#include +#include +#include + +int main(void) +{ + int fd; + + 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; + } + + /* Our heroes: 1 root inode, 1 O_TMPFILE inode, 1 permanent inode. */ + if (mount(NULL, "/tmp", "tmpfs", 0, "nr_inodes=3") == -1) { + fprintf(stderr, "error: mount tmpfs, errno %d\n", errno); + return 1; + } + + fd = openat(AT_FDCWD, "/tmp", O_WRONLY|O_TMPFILE, 0600); + if (fd == -1) { + fprintf(stderr, "error: open 1, errno %d\n", errno); + return 1; + } + if (linkat(fd, "", AT_FDCWD, "/tmp/1", AT_EMPTY_PATH) == -1) { + fprintf(stderr, "error: linkat, errno %d\n", errno); + return 1; + } + close(fd); + + fd = openat(AT_FDCWD, "/tmp", O_WRONLY|O_TMPFILE, 0600); + if (fd == -1) { + fprintf(stderr, "error: open 2, errno %d\n", errno); + return 1; + } + + return 0; +} -- cgit v1.2.3