From b3b111b1bd5fbc678419bf1964b6093045081139 Mon Sep 17 00:00:00 2001
From: Neil Brown <neilb@suse.de>
Date: Tue, 20 Mar 2007 14:18:41 +1100
Subject: [PATCH] Build mount.nfs by default, and install setuid

Also fix a few bugs that came up in initial testing.
---
 configure.in            |  2 +-
 utils/mount/Makefile.am |  3 ++-
 utils/mount/mount.c     | 13 ++++++++++---
 utils/mount/nfsumount.c |  7 ++++++-
 4 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/configure.in b/configure.in
index ce5e2a0..2a72c1c 100644
--- a/configure.in
+++ b/configure.in
@@ -134,7 +134,7 @@ AC_ARG_ENABLE(mount,
 	[AC_HELP_STRING([--enable-mount],
 			[Create mount.nfs and don't use the util-linux mount(8) functionality. @<:@default=no@:>@])],
 	enable_mount=$enableval,
-	enable_mount=no)
+	enable_mount=yes)
 	AM_CONDITIONAL(CONFIG_MOUNT, [test "$enable_mount" = "yes"])
 
 # Check whether user wants TCP wrappers support
diff --git a/utils/mount/Makefile.am b/utils/mount/Makefile.am
index cdd78d8..07e86e4 100644
--- a/utils/mount/Makefile.am
+++ b/utils/mount/Makefile.am
@@ -21,7 +21,8 @@ install-exec-hook:
 	(cd $(DESTDIR)$(sbindir) && \
 	  ln -sf mount.nfs mount.nfs4 && \
 	  ln -sf mount.nfs umount.nfs && \
-	  ln -sf mount.nfs umount.nfs4)
+	  ln -sf mount.nfs umount.nfs4 && \
+	  chmod 4511 mount.nfs )
 uninstall-hook:
 	(cd $(DESTDIR)$(sbindir) && \
 	    rm -f mount.nfs4 umount.nfs umount.nfs4)
diff --git a/utils/mount/mount.c b/utils/mount/mount.c
index 9ae66f0..c6644b1 100644
--- a/utils/mount/mount.c
+++ b/utils/mount/mount.c
@@ -436,12 +436,18 @@ int main(int argc, char *argv[])
 
 		if ((mc = getfsfile(mount_point)) == NULL ||
 		    strcmp(mc->m.mnt_fsname, spec) != 0 ||
-		    strcmp(mc->m.mnt_type, (nfs_mount_vers == 4 ? "nfs4":"nfs")) != 0 || 
-		    strcmp(mc->m.mnt_opts, mount_opts) != 0) {
+		    strcmp(mc->m.mnt_type, (nfs_mount_vers == 4 ? "nfs4":"nfs")) != 0
+		    ) {
 			fprintf(stderr, "%s: permission died - no match for fstab\n",
 				progname);
 			exit(1);
 		}
+		/* 'mount' munges the options from fstab before passing them
+		 * to us, so it is non-trivial to test that we have the correct
+		 * set of options and we don't want to trust what the user
+		 * gave us, so just take whatever is in fstab
+		 */
+		mount_opts = strdup(mc->m.mnt_opts);
 		mounttype = 0;
 	}
 
@@ -479,7 +485,8 @@ int main(int argc, char *argv[])
 	if (!fake) {
 		mnt_err = do_mount_syscall(spec, mount_point,
 					   nfs_mount_vers == 4 ? "nfs4" : "nfs",
-					   flags, mount_opts);
+					   flags & ~(MS_USER|MS_USERS) ,
+					   mount_opts);
 
 		if (mnt_err) {
 			mount_error(mount_point);
diff --git a/utils/mount/nfsumount.c b/utils/mount/nfsumount.c
index 81d0d3a..e65f58f 100644
--- a/utils/mount/nfsumount.c
+++ b/utils/mount/nfsumount.c
@@ -341,6 +341,11 @@ int nfsumount(int argc, char *argv[])
 	if (getuid() != 0) {
 		/* only permitted if "user=" or "users" is in mount options */
 		if (!mc) {
+			/* umount might call us twice.  The second time there will
+			 * be no entry in mtab and we should just exit quietly
+			 */
+			return 0;
+
 		only_root:
 			fprintf(stderr,"%s: You are not permitted to unmount %s\n",
 				progname, spec);
@@ -353,7 +358,7 @@ int nfsumount(int argc, char *argv[])
 			int len;
 			if (!opt)
 				goto only_root;
-			if (opt[5] != '=')
+			if (opt[4] != '=')
 				goto only_root;
 			comma = strchr(opt, ',');
 			if (comma)
-- 
2.39.5