From 2c6b25f01802808b142d450af3352605720899da Mon Sep 17 00:00:00 2001
From: Karel Zak
Date: Tue, 2 Jul 2013 10:46:10 +0200
Subject: libmount: be more restrictive about valid tag names

 # mount DUMMY=filename.img /mnt

The 'DUMMY=filename.img' is a filename and should not be
interpreted as tag name. The valid tag names are LABEL, UUID,
PARTLABEL and PARTUUID only.

Signed-off-by: Karel Zak <kzak@redhat.com>
---
 libmount/src/utils.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'libmount/src/utils.c')

diff --git a/libmount/src/utils.c b/libmount/src/utils.c
index c328414f2..6c5171eca 100644
--- a/libmount/src/utils.c
+++ b/libmount/src/utils.c
@@ -65,6 +65,18 @@ int is_file_empty(const char *name)
 	return (stat(name, &st) != 0 || st.st_size == 0);
 }
 
+int mnt_valid_tagname(const char *tagname)
+{
+	if (tagname && *tagname && (
+	    strcmp("UUID", tagname) == 0 ||
+	    strcmp("LABEL", tagname) == 0 ||
+	    strcmp("PARTUUID", tagname) == 0 ||
+	    strcmp("PARTLABEL", tagname) == 0))
+		return 1;
+
+	return 0;
+}
+
 int mnt_parse_offset(const char *str, size_t len, uintmax_t *res)
 {
 	char *p;
-- 
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