[PATCH] libselinux: Fix file labels for regexes with metachars

[Jeff Vander Stoep <jeffv@google.com>]

File labels assigned using the lookup_best_match() function do not
assign the best match if its regex contains metacharacters.

For non-exact regex matches, lookup_best_match() finds the closest match
by tracking the length of the matching prefix. Prefix match is tracked via
the prefix_len variable. This was previously calculated and set in
the spec_hasMetaChars() function. Commit 3cb6078 removed the
prefix_len calculation, this commit restores it.

Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
---
 libselinux/src/label_file.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libselinux/src/label_file.h b/libselinux/src/label_file.h
index 73bcbba..30bc911 100644
--- a/libselinux/src/label_file.h
+++ b/libselinux/src/label_file.h
@@ -148,6 +148,7 @@ static inline void spec_hasMetaChars(struct spec *spec)
 	end = c + len;
 
 	spec->hasMetaChars = 0;
+	spec->prefix_len = len;
 
 	/* Look at each character in the RE specification string for a
 	 * meta character. Return when any meta character reached. */
@@ -164,6 +165,7 @@ static inline void spec_hasMetaChars(struct spec *spec)
 		case '(':
 		case '{':
 			spec->hasMetaChars = 1;
+			spec->prefix_len = c - spec->regex_str;
 			return;
 		case '\\':	/* skip the next character */
 			c++;
-- 
2.4.3.573.g4eafbef