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Limit the fuzzing function with match limit = recursion limit = 100.

This commit is contained in:
Philip.Hazel 2016-12-20 17:10:30 +00:00
parent a984029d80
commit dfff2fbc9f
1 changed files with 21 additions and 2 deletions
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23
src/pcre2_fuzzsupport.c
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@ -44,6 +44,7 @@ int LLVMFuzzerTestOneInput(const unsigned char *data, size_t size)
uint32_t compile_options; 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;
int r1, r2; int r1, r2;
int i; int i;
@ -120,7 +121,9 @@ for (i = 0; i < 2; i++)
int j; int j;
uint32_t save_match_options = match_options; uint32_t save_match_options = match_options;
/* Create a match data block only when we first need it. */ /* Create match data and context blocks only when we first need them. Set
low match and recursion limits to avoid wasting too much searching large
pattern trees. Almost all matches are going to fail. */
if (match_data == NULL) if (match_data == NULL)
{ {
@ -134,6 +137,20 @@ for (i = 0; i < 2; i++)
} }
} }
if (match_context == NULL)
{
match_context = pcre2_match_context_create(NULL);
if (match_context == NULL)
{
#ifdef STANDALONE
printf("** Failed to create match context block\n");
#endif
return 0;
}
pcre2_set_match_limit(match_context, 100);
pcre2_set_recursion_limit(match_context, 100);
}
/* Match twice, with and without options */ /* Match twice, with and without options */
for (j = 0; j < 2; j++) for (j = 0; j < 2; j++)
@ -152,7 +169,7 @@ for (i = 0; i < 2; i++)
#endif #endif
errorcode = pcre2_match(code, (PCRE2_SPTR)data, (PCRE2_SIZE)size, 0, errorcode = pcre2_match(code, (PCRE2_SPTR)data, (PCRE2_SIZE)size, 0,
match_options, match_data, NULL); match_options, match_data, match_context);
#ifdef STANDALONE #ifdef STANDALONE
if (errorcode >= 0) printf("Match returned %d\n", errorcode); else if (errorcode >= 0) printf("Match returned %d\n", errorcode); else
@ -187,6 +204,8 @@ for (i = 0; i < 2; i++)
} }
if (match_data != NULL) pcre2_match_data_free(match_data); if (match_data != NULL) pcre2_match_data_free(match_data);
if (match_context != NULL) pcre2_match_context_free(match_context);
return 0; return 0;
} }