Line data    Source code

       1             : #if !FD_HAS_HOSTED
       2             : #error "This target requires FD_HAS_HOSTED"
       3             : #endif
       4             : 
       5             : #include <assert.h>
       6             : #include <stdio.h>
       7             : #include <stdlib.h>
       8             : 
       9             : #include "../../util/fd_util.h"
      10             : #include "../../util/sanitize/fd_fuzz.h"
      11             : #include "fd_hex.h"
      12             : 
      13             : int
      14             : LLVMFuzzerInitialize( int  *   argc,
      15          18 :                       char *** argv ) {
      16             :   /* Set up shell without signal handlers */
      17          18 :   putenv( "FD_LOG_BACKTRACE=0" );
      18          18 :   fd_boot( argc, argv );
      19          18 :   atexit( fd_halt );
      20          18 :   return 0;
      21          18 : }
      22             : 
      23             : /* checks if given encoding of sz chars is valid, sz must be even
      24             :    returns sz on success, index of first invalid char on failure */
      25             : static inline ulong
      26           0 : check_hex_encoding( char const * enc, ulong sz  ) {
      27           0 :   ulong i;
      28           0 :   for( i=0; i<sz; i++ ) {
      29           0 :     char c = enc[i];
      30           0 :     if( c>='0' && c<='9' ) continue;
      31           0 :     if( c>='a' && c<='f' ) continue;
      32           0 :     if( c>='A' && c<='F' ) continue;
      33           0 :     return i;
      34           0 :   }
      35           0 :   return sz;
      36           0 : }
      37             : 
      38             : #define MAX_DATA_SZ 4096UL
      39             : #define MAX_DECODED_SZ ( MAX_DATA_SZ / 2UL )
      40             : 
      41             : int
      42             : LLVMFuzzerTestOneInput( uchar const * data,
      43             :                         ulong         size ) {
      44             :   if( FD_UNLIKELY( size > MAX_DATA_SZ ) ) return -1;
      45             :   char const * encoded = ( char  const * ) data;
      46             : 
      47             :   size = size & ~1UL; /* ignore last char of encoding if size is odd */
      48             : 
      49             :   uchar decoded[ MAX_DECODED_SZ ];
      50             :   ulong decoded_sz = fd_hex_decode( decoded, encoded, size/2UL );
      51             : 
      52             :   assert( decoded_sz == ( check_hex_encoding( encoded, size )/2UL ) );
      53             : 
      54             :   FD_FUZZ_MUST_BE_COVERED;
      55             :   return 0;
      56             : }