Unrestricted chown: Userspace patch for mount program This patch adds "unrestricted_chown" option to mount program. This option is used to disable the Posix _POSIX_CHOWN_RESTRICTED chown option on a given filesystem which forbids non-privilegued users to give away files. This is currently implemented by XFS as a sysctl, but making it per filesystem and available not just for XFS makes more sense. This has also been requested in http://oss.sgi.com/bugzilla/show_bug.cgi?id=768. See http://www.opengroup.org/onlinepubs/009695399/functions/chown.html for details. Another patch for kernel changes is also being posted. Signed-off-by: Niraj Kumar <niraj17@xxxxxxxxx> diff -Naurp util-linux-ng-2.14.1.orig/mount/mount.c util-linux-ng-2.14.1/mount/mount.c --- util-linux-ng-2.14.1.orig/mount/mount.c 2008-09-10 14:32:43.000000000 +0530 +++ util-linux-ng-2.14.1/mount/mount.c 2008-12-09 09:37:19.000000000 +0530 @@ -132,6 +132,7 @@ static const struct opt_map opt_map[] = { "sync", 0, 0, MS_SYNCHRONOUS}, /* synchronous I/O */ { "async", 0, 1, MS_SYNCHRONOUS}, /* asynchronous I/O */ { "dirsync", 0, 0, MS_DIRSYNC}, /* synchronous directory modifications */ + { "unrestricted_chown", 0, 0, MS_UNRESTRICTED_CHOWN},/* Unrestricted Chown */ { "remount", 0, 0, MS_REMOUNT}, /* Alter flags of mounted FS */ { "bind", 0, 0, MS_BIND }, /* Remount part of tree elsewhere */ { "rbind", 0, 0, MS_BIND|MS_REC }, /* Idem, plus mounted subtrees */ diff -Naurp util-linux-ng-2.14.1.orig/mount/mount_constants.h util-linux-ng-2.14.1/mount/mount_constants.h --- util-linux-ng-2.14.1.orig/mount/mount_constants.h 2008-05-29 04:31:02.000000000 +0530 +++ util-linux-ng-2.14.1/mount/mount_constants.h 2008-12-09 09:37:19.000000000 +0530 @@ -22,6 +22,9 @@ #ifndef MS_DIRSYNC #define MS_DIRSYNC 128 /* Directory modifications are synchronous */ #endif +#ifndef MS_UNRESTRICTED_CHOWN +#define MS_UNRESTRICTED_CHOWN 256 /* Unrestricted chown */ +#endif #ifndef MS_NOATIME #define MS_NOATIME 0x400 /* 1024: Do not update access times. */ #endif -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
