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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ltp" From: Andrea Cervesato Verify that the root moved into failfs by fchroot() lives in the fs_struct which is duplicated on fork, so a child of a process with the failfs root also fails every absolute path lookup with EOPNOTSUPP. Signed-off-by: Andrea Cervesato --- runtest/syscalls | 1 + testcases/kernel/syscalls/fchroot/.gitignore | 1 + testcases/kernel/syscalls/fchroot/fchroot08.c | 52 +++++++++++++++++++++++++++ 3 files changed, 54 insertions(+) diff --git a/runtest/syscalls b/runtest/syscalls index bc2dffdca..24d9b1b4a 100644 --- a/runtest/syscalls +++ b/runtest/syscalls @@ -323,6 +323,7 @@ fchroot04 fchroot04 fchroot05 fchroot05 fchroot06 fchroot06 fchroot07 fchroot07 +fchroot08 fchroot08 fcntl01 fcntl01 fcntl01_64 fcntl01_64 diff --git a/testcases/kernel/syscalls/fchroot/.gitignore b/testcases/kernel/syscalls/fchroot/.gitignore index bfa2a8ce1..0a2510d8a 100644 --- a/testcases/kernel/syscalls/fchroot/.gitignore +++ b/testcases/kernel/syscalls/fchroot/.gitignore @@ -6,3 +6,4 @@ fchroot05 fchroot06 fchroot07 fchroot07_child +fchroot08 diff --git a/testcases/kernel/syscalls/fchroot/fchroot08.c b/testcases/kernel/syscalls/fchroot/fchroot08.c new file mode 100644 index 000000000..1b20e3162 --- /dev/null +++ b/testcases/kernel/syscalls/fchroot/fchroot08.c @@ -0,0 +1,52 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2026 SUSE LLC Andrea Cervesato + */ + +/*\ + * Test that the failfs root is inherited across :manpage:`fork(2)`. + * + * The root moved into failfs by :manpage:`fchroot(2)` lives in the + * fs_struct which is duplicated on :manpage:`fork(2)`, so a child of a + * process with the failfs root also fails every absolute path lookup with + * ``EOPNOTSUPP``. + * + * Root is required because entering failfs with the ``FD_FAILFS_ROOT`` + * sentinel requires ``CAP_SYS_CHROOT``. + * + * The test runs in a forked child so the root of the parent process is + * left untouched. + */ + +#define _GNU_SOURCE +#include +#include +#include "tst_test.h" +#include "lapi/fcntl.h" +#include "lapi/syscalls.h" + +static void run(void) +{ + if (SAFE_FORK()) + return; + + pid_t pid; + + TST_EXP_PASS(tst_syscall(__NR_fchroot, FD_FAILFS_ROOT, 0), + "fchroot() with the FD_FAILFS_ROOT sentinel"); + + pid = SAFE_FORK(); + if (!pid) { + TST_EXP_FAIL2(open("/", O_PATH), EOPNOTSUPP, + "absolute lookup in a forked child"); + return; + } + + SAFE_WAITPID(pid, NULL, 0); +} + +static struct tst_test test = { + .test_all = run, + .needs_root = 1, + .forks_child = 1, +}; -- 2.51.0 -- Mailing list info: https://lists.linux.it/listinfo/ltp