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| author | Ulrich Drepper <drepper@redhat.com> | 2009-05-15 21:33:43 -0700 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2009-05-15 21:33:43 -0700 |
| commit | 831a40494d44045c0caaf8085ab1d35c0da23140 (patch) | |
| tree | 2a5336cdb2207583c2a42bc99ac8e4a8fbf3dbc7 /nscd | |
| parent | cfe1fc1013d0e7e4863c974fa0e78891cc0a2ed2 (diff) | |
| download | glibc-831a40494d44045c0caaf8085ab1d35c0da23140.tar.gz glibc-831a40494d44045c0caaf8085ab1d35c0da23140.tar.xz glibc-831a40494d44045c0caaf8085ab1d35c0da23140.zip | |
Further robustify nscd database lookup.
We can compute an absolute maximum for the number of elements which can fit into the currently mapped database. Stop after that many iterations.
Diffstat (limited to 'nscd')
| -rw-r--r-- | nscd/nscd-client.h | 7 | ||||
| -rw-r--r-- | nscd/nscd.h | 5 | ||||
| -rw-r--r-- | nscd/nscd_helper.c | 3 |
3 files changed, 8 insertions, 7 deletions
diff --git a/nscd/nscd-client.h b/nscd/nscd-client.h index f66a658d2a..81ca3d56b9 100644 --- a/nscd/nscd-client.h +++ b/nscd/nscd-client.h @@ -44,9 +44,14 @@ /* Path for the configuration file. */ #define _PATH_NSCDCONF "/etc/nscd.conf" -/* Maximu allowed length for the key. */ +/* Maximum allowed length for the key. */ #define MAXKEYLEN 1024 +/* Maximum alignment requirement we will encounter. */ +#define BLOCK_ALIGN_LOG 3 +#define BLOCK_ALIGN (1 << BLOCK_ALIGN_LOG) +#define BLOCK_ALIGN_M1 (BLOCK_ALIGN - 1) + /* Available services. */ typedef enum diff --git a/nscd/nscd.h b/nscd/nscd.h index 3279b85432..632bf58dc5 100644 --- a/nscd/nscd.h +++ b/nscd/nscd.h @@ -111,11 +111,6 @@ struct database_dyn /* Path used when not using persistent storage. */ #define _PATH_NSCD_XYZ_DB_TMP "/var/run/nscd/dbXXXXXX" -/* Maximum alignment requirement we will encounter. */ -#define BLOCK_ALIGN_LOG 3 -#define BLOCK_ALIGN (1 << BLOCK_ALIGN_LOG) -#define BLOCK_ALIGN_M1 (BLOCK_ALIGN - 1) - /* Default value for the maximum size of the database files. */ #define DEFAULT_MAX_DB_SIZE (32 * 1024 * 1024) diff --git a/nscd/nscd_helper.c b/nscd/nscd_helper.c index db247962b9..80ee3e1dd9 100644 --- a/nscd/nscd_helper.c +++ b/nscd/nscd_helper.c @@ -481,6 +481,7 @@ __nscd_cache_search (request_type type, const char *key, size_t keylen, ref_t trail = mapped->head->array[hash]; trail = atomic_forced_read (trail); ref_t work = trail; + size_t loop_cnt = datasize / (offsetof (struct datahead, data) + datalen); int tick = 0; while (work != ENDREF && work + sizeof (struct hashentry) <= datasize) @@ -527,7 +528,7 @@ __nscd_cache_search (request_type type, const char *key, size_t keylen, work = atomic_forced_read (here->next); /* Prevent endless loops. This should never happen but perhaps the database got corrupted, accidentally or deliberately. */ - if (work == trail) + if (work == trail || loop_cnt-- > 0) break; if (tick) { |