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From f5ef29a5b5c51fe2039352dabcc4946fa2f55861 Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Tue, 2 Jul 2013 10:46:10 +0200
Subject: [PATCH 61/84] 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.
Upstream: http://github.com/karelzak/util-linux/commit/2c6b25f01802808b142d450af3352605720899da
Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1248003
Signed-off-by: Karel Zak <kzak@redhat.com>
---
libmount/src/cache.c | 29 ++++++++++++-----------------
libmount/src/fs.c | 9 ++++++---
libmount/src/mountP.h | 2 ++
libmount/src/tab.c | 20 ++++++++------------
libmount/src/utils.c | 12 ++++++++++++
5 files changed, 40 insertions(+), 32 deletions(-)
diff --git a/libmount/src/cache.c b/libmount/src/cache.c
index 7b65122..43a4daf 100644
--- a/libmount/src/cache.c
+++ b/libmount/src/cache.c
@@ -583,22 +583,18 @@ error:
char *mnt_resolve_spec(const char *spec, struct libmnt_cache *cache)
{
char *cn = NULL;
+ char *t = NULL, *v = NULL;
if (!spec)
return NULL;
- if (strchr(spec, '=')) {
- char *tag, *val;
-
- if (!blkid_parse_tag_string(spec, &tag, &val)) {
- cn = mnt_resolve_tag(tag, val, cache);
-
- free(tag);
- free(val);
- }
- } else
+ if (blkid_parse_tag_string(spec, &t, &v) == 0 && mnt_valid_tagname(t))
+ cn = mnt_resolve_tag(t, v, cache);
+ else
cn = mnt_resolve_path(spec, cache);
+ free(t);
+ free(v);
return cn;
}
@@ -663,6 +659,7 @@ int test_read_tags(struct libmnt_test *ts, int argc, char *argv[])
while(fgets(line, sizeof(line), stdin)) {
size_t sz = strlen(line);
+ char *t = NULL, *v = NULL;
if (sz > 0 && line[sz - 1] == '\n')
line[sz - 1] = '\0';
@@ -674,16 +671,14 @@ int test_read_tags(struct libmnt_test *ts, int argc, char *argv[])
if (mnt_cache_read_tags(cache, line) < 0)
fprintf(stderr, "%s: read tags failed\n", line);
- } else if (strchr(line, '=')) {
- char *tag, *val;
+ } else if (blkid_parse_tag_string(line, &t, &v) == 0) {
const char *cn = NULL;
- if (!blkid_parse_tag_string(line, &tag, &val)) {
- cn = cache_find_tag(cache, tag, val);
+ if (mnt_valid_tagname(t))
+ cn = cache_find_tag(cache, t, v);
+ free(t);
+ free(v);
- free(tag);
- free(val);
- }
if (cn)
printf("%s: %s\n", line, cn);
else
diff --git a/libmount/src/fs.c b/libmount/src/fs.c
index c95cdc7..75e3bbb 100644
--- a/libmount/src/fs.c
+++ b/libmount/src/fs.c
@@ -318,9 +318,12 @@ int __mnt_fs_set_source_ptr(struct libmnt_fs *fs, char *source)
assert(fs);
- if (source && *source != '/' && strchr(source, '=')) {
- if (blkid_parse_tag_string(source, &t, &v) != 0)
- return -1;
+ if (source && blkid_parse_tag_string(source, &t, &v) == 0 &&
+ !mnt_valid_tagname(t)) {
+ /* parsable but unknown tag -- ignore */
+ free(t);
+ free(v);
+ t = v = NULL;
}
if (fs->source != source)
diff --git a/libmount/src/mountP.h b/libmount/src/mountP.h
index e064a68..7b0848f 100644
--- a/libmount/src/mountP.h
+++ b/libmount/src/mountP.h
@@ -136,6 +136,8 @@ extern int startswith(const char *s, const char *sx)
extern char *stripoff_last_component(char *path);
+extern int mnt_valid_tagname(const char *tagname);
+
extern int is_file_empty(const char *name);
extern int mkdir_p(const char *path, mode_t mode);
diff --git a/libmount/src/tab.c b/libmount/src/tab.c
index e3524a8..1ba1eec 100644
--- a/libmount/src/tab.c
+++ b/libmount/src/tab.c
@@ -801,7 +801,8 @@ struct libmnt_fs *mnt_table_find_tag(struct libmnt_table *tb, const char *tag,
struct libmnt_fs *mnt_table_find_source(struct libmnt_table *tb,
const char *source, int direction)
{
- struct libmnt_fs *fs = NULL;
+ struct libmnt_fs *fs;
+ char *t = NULL, *v = NULL;
assert(tb);
@@ -812,18 +813,13 @@ struct libmnt_fs *mnt_table_find_source(struct libmnt_table *tb,
DBG(TAB, mnt_debug_h(tb, "lookup SOURCE: '%s'", source));
- if (source && *source && strchr(source, '=')) {
- char *tag, *val;
-
- if (blkid_parse_tag_string(source, &tag, &val) == 0) {
-
- fs = mnt_table_find_tag(tb, tag, val, direction);
-
- free(tag);
- free(val);
- }
- } else
+ if (blkid_parse_tag_string(source, &t, &v) || !mnt_valid_tagname(t))
fs = mnt_table_find_srcpath(tb, source, direction);
+ else
+ fs = mnt_table_find_tag(tb, t, v, direction);
+
+ free(t);
+ free(v);
return fs;
}
diff --git a/libmount/src/utils.c b/libmount/src/utils.c
index 6a444ad..9305bb8 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;
--
2.7.4