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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ltp" From: Andrea Cervesato Verify that fchroot() with a directory fd moves the process root to the directory referenced by the fd. Reviewed-by: Cyril Hrubis Signed-off-by: Andrea Cervesato --- runtest/syscalls | 2 + testcases/kernel/syscalls/fchroot/.gitignore | 1 + testcases/kernel/syscalls/fchroot/Makefile | 7 ++++ testcases/kernel/syscalls/fchroot/fchroot01.c | 56 +++++++++++++++++++++++++++ 4 files changed, 66 insertions(+) diff --git a/runtest/syscalls b/runtest/syscalls index accdf2df9..558ad1732 100644 --- a/runtest/syscalls +++ b/runtest/syscalls @@ -316,6 +316,8 @@ fchownat01 fchownat01 fchownat02 fchownat02 fchownat03 fchownat03 +fchroot01 fchroot01 + fcntl01 fcntl01 fcntl01_64 fcntl01_64 fcntl02 fcntl02 diff --git a/testcases/kernel/syscalls/fchroot/.gitignore b/testcases/kernel/syscalls/fchroot/.gitignore new file mode 100644 index 000000000..03ebdbe7a --- /dev/null +++ b/testcases/kernel/syscalls/fchroot/.gitignore @@ -0,0 +1 @@ +fchroot01 diff --git a/testcases/kernel/syscalls/fchroot/Makefile b/testcases/kernel/syscalls/fchroot/Makefile new file mode 100644 index 000000000..137550149 --- /dev/null +++ b/testcases/kernel/syscalls/fchroot/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0-or-later +# Copyright (C) 2026 SUSE LLC Andrea Cervesato + +top_srcdir ?= ../../../.. + +include $(top_srcdir)/include/mk/testcases.mk +include $(top_srcdir)/include/mk/generic_leaf_target.mk diff --git a/testcases/kernel/syscalls/fchroot/fchroot01.c b/testcases/kernel/syscalls/fchroot/fchroot01.c new file mode 100644 index 000000000..c43ba4a73 --- /dev/null +++ b/testcases/kernel/syscalls/fchroot/fchroot01.c @@ -0,0 +1,56 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2026 SUSE LLC Andrea Cervesato + */ + +/*\ + * Test that :manpage:`fchroot(2)` with a regular directory fd moves the + * process root to the directory referenced by the fd. + * + * This is the fd-based counterpart of :manpage:`chroot(2)`, introduced in + * Linux v7.3. Root is required because :manpage:`fchroot(2)` with a regular + * directory fd requires ``CAP_SYS_CHROOT``. + * + * The test runs in a forked child so the root of the parent process is + * left untouched. + */ + +#include +#include +#include "tst_test.h" +#include "lapi/fcntl.h" +#include "lapi/syscalls.h" + +#define JAILDIR "jail" +#define CANARY "/canary" +#define CANARYDIR (JAILDIR CANARY) + +static void run(void) +{ + struct stat st; + + if (SAFE_FORK()) + return; + + int dfd = SAFE_OPEN(JAILDIR, O_PATH | O_DIRECTORY); + + TST_EXP_PASS(tst_syscall(__NR_fchroot, dfd, 0), + "fchroot() with a directory fd"); + + TST_EXP_PASS(stat(CANARY, &st), + "canary file visible under the new root"); +} + +static void setup(void) +{ + SAFE_MKDIR(JAILDIR, 0755); + SAFE_TOUCH(CANARYDIR, 0644, NULL); +} + +static struct tst_test test = { + .setup = setup, + .test_all = run, + .needs_root = 1, + .needs_tmpdir = 1, + .forks_child = 1, +}; -- 2.51.0 -- Mailing list info: https://lists.linux.it/listinfo/ltp