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Limit the subject length in the fuzzer support function, to avoid wasting time 

searching large trees.
This commit is contained in:
Philip.Hazel 2016-12-31 13:46:36 +00:00
parent 18dd19eae0
commit f42fb677b9
1 changed files with 9 additions and 1 deletions
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10
src/pcre2_fuzzsupport.c
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@ -17,6 +17,8 @@ Written by Philip Hazel, October 2016
#define PCRE2_CODE_UNIT_WIDTH 8 #define PCRE2_CODE_UNIT_WIDTH 8
#include "pcre2.h" #include "pcre2.h"
#define MAX_MATCH_SIZE 1000
#define ALLOWED_COMPILE_OPTIONS \ #define ALLOWED_COMPILE_OPTIONS \
(PCRE2_ANCHORED|PCRE2_ALLOW_EMPTY_CLASS|PCRE2_ALT_BSUX|PCRE2_ALT_CIRCUMFLEX| \ (PCRE2_ANCHORED|PCRE2_ALLOW_EMPTY_CLASS|PCRE2_ALT_BSUX|PCRE2_ALT_CIRCUMFLEX| \
PCRE2_ALT_VERBNAMES|PCRE2_AUTO_CALLOUT|PCRE2_CASELESS|PCRE2_DOLLAR_ENDONLY| \ PCRE2_ALT_VERBNAMES|PCRE2_AUTO_CALLOUT|PCRE2_CASELESS|PCRE2_DOLLAR_ENDONLY| \
@ -56,11 +58,17 @@ uint32_t compile_options;
uint32_t match_options; uint32_t match_options;
pcre2_match_data *match_data = NULL; pcre2_match_data *match_data = NULL;
pcre2_match_context *match_context = NULL; pcre2_match_context *match_context = NULL;
size_t match_size;
int r1, r2; int r1, r2;
int i; int i;
if (size < 1) return 0; if (size < 1) return 0;
/* Limiting the length of the subject for matching stops fruitless searches
in large trees taking too much time. */
match_size = (size > MAX_MATCH_SIZE)? MAX_MATCH_SIZE : size;
/* Figure out some options to use. Initialize the random number to ensure /* Figure out some options to use. Initialize the random number to ensure
repeatability. Ensure that we get a 32-bit unsigned random number for testing repeatability. Ensure that we get a 32-bit unsigned random number for testing
options. (RAND_MAX is required to be at least 32767, but is commonly options. (RAND_MAX is required to be at least 32767, but is commonly
@ -182,7 +190,7 @@ for (i = 0; i < 2; i++)
#endif #endif
callout_count = 0; callout_count = 0;
errorcode = pcre2_match(code, (PCRE2_SPTR)data, (PCRE2_SIZE)size, 0, errorcode = pcre2_match(code, (PCRE2_SPTR)data, (PCRE2_SIZE)match_size, 0,
match_options, match_data, match_context); match_options, match_data, match_context);
#ifdef STANDALONE #ifdef STANDALONE