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Only initialise stream state history when required.

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This fixes 01org/hyperscan#30.
This commit is contained in:
Matthew Barr 2016-08-26 11:08:29 +10:00
parent c1bc6acdea
commit f05e833e10
1 changed files with 15 additions and 11 deletions
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26
src/runtime.c
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@ -466,16 +466,19 @@ void maintainHistoryBuffer(const struct RoseEngine *rose, char *state,
}
static really_inline
void init_stream(struct hs_stream *s, const struct RoseEngine *rose) {
void init_stream(struct hs_stream *s, const struct RoseEngine *rose,
char init_history) {
char *state = getMultiState(s);
// Make absolutely sure that the 16 bytes leading up to the end of the
// history buffer are initialised, as we rely on this (regardless of the
// actual values used) in FDR.
char *hist_end = state + rose->stateOffsets.history + rose->historyRequired;
assert(hist_end - 16 >= (const char *)s);
unaligned_store_u64a(hist_end - 16, 0xDEADDEADDEADDEADull);
unaligned_store_u64a(hist_end - 8, 0xDEADDEADDEADDEADull);
if (init_history) {
// Make absolutely sure that the 16 bytes leading up to the end of the
// history buffer are initialised, as we rely on this (regardless of the
// actual values used) in FDR.
char *hist_end =
state + rose->stateOffsets.history + rose->historyRequired;
assert(hist_end - 16 >= (const char *)s);
memset(hist_end - 16, 0x5a, 16);
}
s->rose = rose;
s->offset = 0;
@ -518,7 +521,7 @@ hs_error_t hs_open_stream(const hs_database_t *db, UNUSED unsigned flags,
return HS_NOMEM;
}
init_stream(s, rose);
init_stream(s, rose, 1);
*stream = s;
return HS_SUCCESS;
@ -962,7 +965,8 @@ hs_error_t hs_reset_stream(hs_stream_t *id, UNUSED unsigned int flags,
unmarkScratchInUse(scratch);
}
init_stream(id, id->rose);
// history already initialised
init_stream(id, id->rose, 0);
return HS_SUCCESS;
}
@ -1047,7 +1051,7 @@ hs_error_t hs_scan_vector(const hs_database_t *db, const char * const * data,
hs_stream_t *id = (hs_stream_t *)(scratch->bstate);
init_stream(id, rose); /* open stream */
init_stream(id, rose, 1); /* open stream */
for (u32 i = 0; i < count; i++) {
DEBUG_PRINTF("block %u/%u offset=%llu len=%u\n", i, count, id->offset,