diff options
| author | Michal Zidek <mzidek@redhat.com> | 2013-08-12 16:23:59 +0200 |
|---|---|---|
| committer | Jakub Hrozek <jhrozek@redhat.com> | 2013-08-19 22:24:41 +0200 |
| commit | f9091077bfbb09f052d08e25ac5e00af0baa6dfb (patch) | |
| tree | 83f8b89d6593c039f0175a786897f2acedc7946c | |
| parent | 7d40fefdb9b51e8c0c53b475a2d8d86befd03e17 (diff) | |
mmap_cache: Store corrupted mmap cache before reset
This patch adds function to store corrupted mmap cache file to
disk for further analysis.
| -rw-r--r-- | src/responder/nss/nsssrv_mmap_cache.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/responder/nss/nsssrv_mmap_cache.c b/src/responder/nss/nsssrv_mmap_cache.c index 95a7fe9d..fced018e 100644 --- a/src/responder/nss/nsssrv_mmap_cache.c +++ b/src/responder/nss/nsssrv_mmap_cache.c @@ -93,6 +93,68 @@ struct sss_mc_ctx { else used = false; \ } while (0) +/* This function will store corrupted memcache to disk for later + * analysis. */ +static void sss_mc_save_corrupted(struct sss_mc_ctx *mc_ctx) +{ + int err; + int fd = -1; + ssize_t written; + char *file = NULL; + TALLOC_CTX *tmp_ctx; + + if (mc_ctx == NULL) { + DEBUG(SSSDBG_TRACE_FUNC, + ("Cannot store uninitialized cache. Nothing to do.\n")); + return; + } + + tmp_ctx = talloc_new(NULL); + if (tmp_ctx == NULL) { + DEBUG(SSSDBG_CRIT_FAILURE, ("Out of memory.\n")); + return; + } + + file = talloc_asprintf(tmp_ctx, "%s_%s", + mc_ctx->file, "corrupted"); + if (file == NULL) { + DEBUG(SSSDBG_CRIT_FAILURE, ("Out of memory.\n")); + goto done; + } + + /* We will always store only the last problematic cache state */ + fd = creat(file, 0600); + if (fd == -1) { + err = errno; + DEBUG(SSSDBG_CRIT_FAILURE, + ("Failed to open file '%s' [%d]: %s\n", + file, err, strerror(err))); + goto done; + } + + written = write(fd, mc_ctx->mmap_base, mc_ctx->mmap_size); + if (written != mc_ctx->mmap_size) { + if (written == -1) { + err = errno; + DEBUG(SSSDBG_CRIT_FAILURE, + ("write() failed [%d]: %s\n", err, strerror(err))); + } else { + DEBUG(SSSDBG_CRIT_FAILURE, + ("write() returned %zd (expected (%zd))\n", + written, mc_ctx->mmap_size)); + } + goto done; + } + + sss_log(SSS_LOG_NOTICE, + "Stored copy of corrupted mmap cache in file '%s\n'", file); +done: + if (fd != -1) { + close(fd); + } + talloc_free(tmp_ctx); +} + static uint32_t sss_mc_hash(struct sss_mc_ctx *mcc, const char *key, size_t len) { @@ -421,6 +483,7 @@ static struct sss_mc_rec *sss_mc_find_record(struct sss_mc_ctx *mcc, if (!MC_SLOT_WITHIN_BOUNDS(slot, mcc->dt_size)) { DEBUG(SSSDBG_FATAL_FAILURE, ("Corrupted fastcache. Slot number too big.\n")); + sss_mc_save_corrupted(mcc); sss_mmap_cache_reset(mcc); return NULL; } @@ -437,6 +500,7 @@ static struct sss_mc_rec *sss_mc_find_record(struct sss_mc_ctx *mcc, || (uint8_t *)rec->data + strs_offset + strs_len > max_addr) { DEBUG(SSSDBG_FATAL_FAILURE, ("Corrupted fastcache. name_ptr value is %u.\n", name_ptr)); + sss_mc_save_corrupted(mcc); sss_mmap_cache_reset(mcc); return NULL; } @@ -675,6 +739,7 @@ errno_t sss_mmap_cache_pw_invalidate_uid(struct sss_mc_ctx *mcc, uid_t uid) while (slot != MC_INVALID_VAL) { if (!MC_SLOT_WITHIN_BOUNDS(slot, mcc->dt_size)) { DEBUG(SSSDBG_FATAL_FAILURE, ("Corrupted fastcache.\n")); + sss_mc_save_corrupted(mcc); sss_mmap_cache_reset(mcc); ret = ENOENT; goto done; @@ -813,6 +878,7 @@ errno_t sss_mmap_cache_gr_invalidate_gid(struct sss_mc_ctx *mcc, gid_t gid) while (slot != MC_INVALID_VAL) { if (!MC_SLOT_WITHIN_BOUNDS(slot, mcc->dt_size)) { DEBUG(SSSDBG_FATAL_FAILURE, ("Corrupted fastcache.\n")); + sss_mc_save_corrupted(mcc); sss_mmap_cache_reset(mcc); ret = ENOENT; goto done; |