From: Theodore Ts'o <tytso@mit.edu>
Date: Thu, 23 Apr 2009 02:20:22 +0000 (-0400)
Subject: libext2fs: Skip relative pathnames in /etc/mtab in ismounted.c
X-Git-Tag: v1.41.5~10
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f9110f4480eade2d849c4cc08efa49bf0f7f5148;p=thirdparty%2Fe2fsprogs.git

libext2fs: Skip relative pathnames in /etc/mtab in ismounted.c

The functions which test to see if a device is mounted can get
confused by entries in /etc/mtab for virtual filesystems:

rootfs / rootfs rw 0 0
none /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0

If the device name doesn't start with a slash, ignore the /etc/mtab
entry, so that relative pathnames passed into functions such as
ext2fs_check_mount_point() or ext2fs_check_if_mounted() don't return
false positives.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---

diff --git a/lib/ext2fs/ismounted.c b/lib/ext2fs/ismounted.c
index 4a7c8c69f..4c5500f46 100644
--- a/lib/ext2fs/ismounted.c
+++ b/lib/ext2fs/ismounted.c
@@ -65,6 +65,8 @@ static errcode_t check_mntent_file(const char *mtab_file, const char *file,
 		}
 	}
 	while ((mnt = getmntent (f)) != NULL) {
+		if (mnt->mnt_fsname[0] != '/')
+			continue;
 		if (strcmp(file, mnt->mnt_fsname) == 0)
 			break;
 		if (stat(mnt->mnt_fsname, &st_buf) == 0) {