DeforaNetworks/hashcat
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Memory: Reduced default maximum bitmap size from 24 to 18 and give a notice to use --bitmap-max to restore

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This commit is contained in:
Jens Steube
2018-11-04 10:07:45 +01:00
parent 399bd2562a
commit 344ea5b36d
4 changed files with 26 additions and 2 deletions
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src/bitmap.c
+6
View File
@@ -7,6 +7,7 @@
#include "types.h"
#include "memory.h"
#include "bitmap.h"
#include "event.h"
static void selftest_to_bitmap (const u32 dgst_shifts, char *digests_buf_ptr, const u32 dgst_pos0, const u32 dgst_pos1, const u32 dgst_pos2, const u32 dgst_pos3, const u32 bitmap_mask, u32 *bitmap_a, u32 *bitmap_b, u32 *bitmap_c, u32 *bitmap_d)
{
@@ -128,6 +129,11 @@ int bitmap_ctx_init (hashcat_ctx_t *hashcat_ctx)
break;
}
if (bitmap_bits == bitmap_max)
{
EVENT_DATA (EVENT_BITMAP_FINAL_OVERFLOW, NULL, 0);
}
bitmap_nums = 1u << bitmap_bits;
bitmap_mask = bitmap_nums - 1;
src/main.c
+15
View File
@@ -580,6 +580,20 @@ static void main_bitmap_init_post (MAYBE_UNUSED hashcat_ctx_t *hashcat_ctx, MAYB
event_log_info_nn (hashcat_ctx, "Generated bitmap tables...");
}
static void main_bitmap_final_overflow (MAYBE_UNUSED hashcat_ctx_t *hashcat_ctx, MAYBE_UNUSED const void *buf, MAYBE_UNUSED const size_t len)
{
const user_options_t *user_options = hashcat_ctx->user_options;
if (user_options->quiet == true) return;
event_log_advice (hashcat_ctx, "Bitmap table overflowed at %d bits.", user_options->bitmap_max);
event_log_advice (hashcat_ctx, "This typically happens with too many hashes and reduces your performance.");
event_log_advice (hashcat_ctx, "You can increase the bitmap table size with --bitmap-max, but");
event_log_advice (hashcat_ctx, "this creates a trade-off between L2-cache and bitmap efficiency.");
event_log_advice (hashcat_ctx, "It is therefore not guaranteed to restore full performance.");
event_log_advice (hashcat_ctx, NULL);
}
static void main_set_kernel_power_final (MAYBE_UNUSED hashcat_ctx_t *hashcat_ctx, MAYBE_UNUSED const void *buf, MAYBE_UNUSED const size_t len)
{
const user_options_t *user_options = hashcat_ctx->user_options;
@@ -954,6 +968,7 @@ static void event (const u32 id, hashcat_ctx_t *hashcat_ctx, const void *buf, co
{
case EVENT_BITMAP_INIT_POST: main_bitmap_init_post (hashcat_ctx, buf, len); break;
case EVENT_BITMAP_INIT_PRE: main_bitmap_init_pre (hashcat_ctx, buf, len); break;
case EVENT_BITMAP_FINAL_OVERFLOW: main_bitmap_final_overflow (hashcat_ctx, buf, len); break;
case EVENT_CALCULATED_WORDS_BASE: main_calculated_words_base (hashcat_ctx, buf, len); break;
case EVENT_CRACKER_FINISHED: main_cracker_finished (hashcat_ctx, buf, len); break;
case EVENT_CRACKER_HASH_CRACKED: main_cracker_hash_cracked (hashcat_ctx, buf, len); break;