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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ltp" From: Andrea Cervesato Verify that after fchroot() moved the root into failfs, loading a binary by absolute path fails with EOPNOTSUPP. The exec runs in a grandchild so a wrongly successful exec is still detected through the exit code. Reviewed-by: Cyril Hrubis Signed-off-by: Andrea Cervesato --- runtest/syscalls | 1 + testcases/kernel/syscalls/fchroot/.gitignore | 2 + testcases/kernel/syscalls/fchroot/fchroot07.c | 58 ++++++++++++++++++++++ .../kernel/syscalls/fchroot/fchroot07_child.c | 16 ++++++ 4 files changed, 77 insertions(+) diff --git a/runtest/syscalls b/runtest/syscalls index 8b688cbe2..bc2dffdca 100644 --- a/runtest/syscalls +++ b/runtest/syscalls @@ -322,6 +322,7 @@ fchroot03 fchroot03 fchroot04 fchroot04 fchroot05 fchroot05 fchroot06 fchroot06 +fchroot07 fchroot07 fcntl01 fcntl01 fcntl01_64 fcntl01_64 diff --git a/testcases/kernel/syscalls/fchroot/.gitignore b/testcases/kernel/syscalls/fchroot/.gitignore index 12151270a..bfa2a8ce1 100644 --- a/testcases/kernel/syscalls/fchroot/.gitignore +++ b/testcases/kernel/syscalls/fchroot/.gitignore @@ -4,3 +4,5 @@ fchroot03 fchroot04 fchroot05 fchroot06 +fchroot07 +fchroot07_child diff --git a/testcases/kernel/syscalls/fchroot/fchroot07.c b/testcases/kernel/syscalls/fchroot/fchroot07.c new file mode 100644 index 000000000..0bd16890d --- /dev/null +++ b/testcases/kernel/syscalls/fchroot/fchroot07.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2026 SUSE LLC Andrea Cervesato + */ + +/*\ + * Test that :manpage:`execve(2)` is blocked under the failfs root. + * + * After :manpage:`fchroot(2)` moved the process root into failfs, loading + * a binary by absolute path fails 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 "tst_test.h" +#include "lapi/fcntl.h" +#include "lapi/syscalls.h" + +#define CHILD_EXEC "fchroot07_child" + +static char child_path[PATH_MAX]; + +static void run(void) +{ + if (SAFE_FORK()) + return; + + TST_EXP_PASS(tst_syscall(__NR_fchroot, FD_FAILFS_ROOT, 0), + "fchroot() with the FD_FAILFS_ROOT sentinel"); + + if (!SAFE_FORK()) { + TST_EXP_FAIL(execl(child_path, CHILD_EXEC, NULL), EOPNOTSUPP, + "absolute exec blocked by the failfs root"); + return; + } + + SAFE_WAIT(NULL); +} + +static void setup(void) +{ + if (tst_get_path(CHILD_EXEC, child_path, sizeof(child_path))) + tst_brk(TCONF, "Couldn't find %s in $PATH", CHILD_EXEC); +} + +static struct tst_test test = { + .setup = setup, + .test_all = run, + .needs_root = 1, + .forks_child = 1, + .child_needs_reinit = 1, +}; diff --git a/testcases/kernel/syscalls/fchroot/fchroot07_child.c b/testcases/kernel/syscalls/fchroot/fchroot07_child.c new file mode 100644 index 000000000..3d731781c --- /dev/null +++ b/testcases/kernel/syscalls/fchroot/fchroot07_child.c @@ -0,0 +1,16 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2026 SUSE LLC Andrea Cervesato + */ + +#define TST_NO_DEFAULT_MAIN +#include "tst_test.h" + +int main(void) +{ + tst_reinit(); + + tst_res(TFAIL, "child executed"); + + return 0; +} -- 2.51.0 -- Mailing list info: https://lists.linux.it/listinfo/ltp