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Validate mountpoint on path-based unmount using statx

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Use statx to verify that path-based unmounts proceed only if the
mountpoint reported by statx matches the MNTTAB entry reported by
libzfs, aborting the operation if they differ. Align
`zfs umount /path` behavior with `zfs umount dataset`.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #17481
This commit is contained in:
Ameer Hamza
2025-07-09 07:10:00 +05:00
committed by GitHub
parent 6af8db61b1
commit 523d9d6007
5 changed files with 89 additions and 6 deletions
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config/user-statx.m4
+34
View File
@@ -0,0 +1,34 @@
dnl #
dnl # Check for statx() function and STATX_MNT_ID availability
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_STATX], [
AC_CHECK_HEADERS([linux/stat.h],
[have_stat_headers=yes],
[have_stat_headers=no])
AS_IF([test "x$have_stat_headers" = "xyes"], [
AC_CHECK_FUNC([statx], [
AC_DEFINE([HAVE_STATX], [1], [statx() is available])
dnl Check for STATX_MNT_ID availability
AC_MSG_CHECKING([for STATX_MNT_ID])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
#include <linux/stat.h>
]], [[
struct statx stx;
int mask = STATX_MNT_ID;
(void)mask;
(void)stx.stx_mnt_id;
]])
], [
AC_MSG_RESULT([yes])
AC_DEFINE([HAVE_STATX_MNT_ID], [1], [STATX_MNT_ID is available])
], [
AC_MSG_RESULT([no])
])
])
], [
AC_MSG_WARN([linux/stat.h not found; skipping statx support])
])
]) dnl end AC_DEFUN
config/user.m4
+1
View File
@@ -17,6 +17,7 @@ AC_DEFUN([ZFS_AC_CONFIG_USER], [
ZFS_AC_CONFIG_USER_LIBUDEV
ZFS_AC_CONFIG_USER_LIBUUID
ZFS_AC_CONFIG_USER_LIBBLKID
ZFS_AC_CONFIG_USER_STATX
])
ZFS_AC_CONFIG_USER_LIBTIRPC
ZFS_AC_CONFIG_USER_LIBCRYPTO