diff options
Diffstat (limited to 'nscd')
| -rw-r--r-- | nscd/connections.c | 10 | ||||
| -rw-r--r-- | nscd/nscd_helper.c | 21 |
2 files changed, 25 insertions, 6 deletions
diff --git a/nscd/connections.c b/nscd/connections.c index 2572a42..26d75d2 100644 --- a/nscd/connections.c +++ b/nscd/connections.c @@ -378,8 +378,9 @@ verify_persistent_db (void *mem, struct database_pers_head *readhead, int dbnr) nscd_ssize_t he_cnt = 0; for (nscd_ssize_t cnt = 0; cnt < head->module; ++cnt) { - ref_t first = head->array[cnt]; - ref_t work = first; + ref_t trail = head->array[cnt]; + ref_t work = trail; + int tick = 0; while (work != ENDREF) { @@ -439,9 +440,12 @@ verify_persistent_db (void *mem, struct database_pers_head *readhead, int dbnr) work = here->next; - if (work == first) + if (work == trail) /* A circular list, this must not happen. */ goto fail; + if (tick) + trail = ((struct hashentry *) (data + trail))->next; + tick = 1 - tick; } } diff --git a/nscd/nscd_helper.c b/nscd/nscd_helper.c index 2e6d5f7..6718d92 100644 --- a/nscd/nscd_helper.c +++ b/nscd/nscd_helper.c @@ -416,8 +416,10 @@ __nscd_cache_search (request_type type, const char *key, size_t keylen, unsigned long int hash = __nis_hash (key, keylen) % mapped->head->module; size_t datasize = mapped->datasize; - ref_t first = mapped->head->array[hash]; - ref_t work = first; + ref_t trail = mapped->head->array[hash]; + ref_t work = trail; + int tick = 0; + while (work != ENDREF && work + sizeof (struct hashentry) <= datasize) { struct hashentry *here = (struct hashentry *) (mapped->data + work); @@ -457,8 +459,21 @@ __nscd_cache_search (request_type type, const char *key, size_t keylen, work = here->next; /* Prevent endless loops. This should never happen but perhaps the database got corrupted, accidentally or deliberately. */ - if (work == first) + if (work == trail) break; + if (tick) + { + struct hashentry *trailelem; + trailelem = (struct hashentry *) (mapped->data + trail); + +#ifndef _STRING_ARCH_unaligned + /* We have to redo the checks. Maybe the data changed. */ + if ((uintptr_t) trailelem & (__alignof__ (*trailelem) - 1)) + return NULL; +#endif + trail = trailelem->next; + } + tick = 1 - tick; } return NULL; |