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authorDJ Delorie <dj@redhat.com>2018-03-01 23:20:45 -0500
committerDJ Delorie <dj@redhat.com>2018-03-01 23:23:24 -0500
commit1c81d55fc4b07b51adf68558ba74ce975153e580 (patch)
treeae660ff20c68b799bb31297f57af2a1a5cf9ef80 /nscd
parentnptl_db: Remove stale `match_pid' parameter from `iterate_thread_list' (diff)
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[BZ #22342] Fix netgroup cache keys.
Unlike other nscd caches, the netgroup cache contains two types of records - those for "iterate through a netgroup" (i.e. setnetgrent()) and those for "is this user in this netgroup" (i.e. innetgr()), i.e. full and partial records. The timeout code assumes these records have the same key for the group name, so that the collection of records that is "this netgroup" can be expired as a unit. However, the keys are not the same, as the in-netgroup key is generated by nscd rather than being passed to it from elsewhere, and is generated without the trailing NUL. All other keys have the trailing NUL, and as noted in the linked BZ, debug statements confirm that two keys for the same netgroup are added to the cache with two different lengths. The result of this is that as records in the cache expire, the purge code only cleans out one of the two types of entries, resulting in stale, possibly incorrect, and possibly inconsistent cache data. The patch simply includes the existing NUL in the computation for the key length ('key' points to the char after the NUL, and 'group' to the first char of the group, so 'key-group' includes the first char to the NUL, inclusive). [BZ #22342] * nscd/netgroupcache.c (addinnetgrX): Include trailing NUL in key value. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'nscd')
-rw-r--r--nscd/netgroupcache.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/nscd/netgroupcache.c b/nscd/netgroupcache.c
index b832c9315f..2f187b208c 100644
--- a/nscd/netgroupcache.c
+++ b/nscd/netgroupcache.c
@@ -480,7 +480,7 @@ addinnetgrX (struct database_dyn *db, int fd, request_header *req,
{
const char *group = key;
key = (char *) rawmemchr (key, '\0') + 1;
- size_t group_len = key - group - 1;
+ size_t group_len = key - group;
const char *host = *key++ ? key : NULL;
if (host != NULL)
key = (char *) rawmemchr (key, '\0') + 1;