aboutsummaryrefslogtreecommitdiff
path: root/nscd
diff options
context:
space:
mode:
authorSiddhesh Poyarekar <siddhesh@redhat.com>2014-04-30 12:00:39 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2014-04-30 12:00:39 +0530
commitbc8f194c8c29e46e8ee4034f06e46988dfff38f7 (patch)
treefce0fda2012a3d78d9557afc4a4f5bbe5fa9ee4c /nscd
parent1cdeb2372ddecac0dfe0c132a033e9590ffa07d2 (diff)
downloadglibc-bc8f194c8c29e46e8ee4034f06e46988dfff38f7.zip
glibc-bc8f194c8c29e46e8ee4034f06e46988dfff38f7.tar.gz
glibc-bc8f194c8c29e46e8ee4034f06e46988dfff38f7.tar.bz2
Initialize all of datahead structure in nscd (BZ #16791)
The datahead structure has an unused padding field that remains uninitialized. Valgrind prints out a warning for it on querying a netgroups entry. This is harmless, but is a potential data leak since it would result in writing out an uninitialized byte to the cache file. Besides, this happens only when there is a cache miss, so we're not adding computation to any fast path.
Diffstat (limited to 'nscd')
-rw-r--r--nscd/nscd-client.h20
1 files changed, 16 insertions, 4 deletions
diff --git a/nscd/nscd-client.h b/nscd/nscd-client.h
index c069bf6..ee16df6 100644
--- a/nscd/nscd-client.h
+++ b/nscd/nscd-client.h
@@ -240,12 +240,17 @@ static inline time_t
datahead_init_common (struct datahead *head, nscd_ssize_t allocsize,
nscd_ssize_t recsize, uint32_t ttl)
{
+ /* Initialize so that we don't write out junk in uninitialized data to the
+ cache. */
+ memset (head, 0, sizeof (*head));
+
head->allocsize = allocsize;
head->recsize = recsize;
head->usable = true;
head->ttl = ttl;
- /* Compute the timeout time. */
+
+ /* Compute and return the timeout time. */
return head->timeout = time (NULL) + ttl;
}
@@ -253,18 +258,25 @@ static inline time_t
datahead_init_pos (struct datahead *head, nscd_ssize_t allocsize,
nscd_ssize_t recsize, uint8_t nreloads, uint32_t ttl)
{
+ time_t ret = datahead_init_common (head, allocsize, recsize, ttl);
+
head->notfound = false;
head->nreloads = nreloads;
- return datahead_init_common (head, allocsize, recsize, ttl);
+
+ return ret;
}
static inline time_t
datahead_init_neg (struct datahead *head, nscd_ssize_t allocsize,
nscd_ssize_t recsize, uint32_t ttl)
{
+ time_t ret = datahead_init_common (head, allocsize, recsize, ttl);
+
+ /* We don't need to touch nreloads here since it is set to our desired value
+ (0) when we clear the structure. */
head->notfound = true;
- head->nreloads = 0;
- return datahead_init_common (head, allocsize, recsize, ttl);
+
+ return ret;
}
/* Structure for one hash table entry. */