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Improve fuzzer stability in persistent mode #453

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Sep 14, 2023
Merged

Improve fuzzer stability in persistent mode #453

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11 changes: 11 additions & 0 deletions tools/ZydisFuzzShared.c
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Original file line number Diff line number Diff line change
Expand Up @@ -39,14 +39,25 @@
# include <io.h>
#endif

#ifdef ZYAN_POSIX
# include <unistd.h>
#endif

/* ============================================================================================== */
/* Stream reading abstraction */
/* ============================================================================================== */

ZyanUSize ZydisStdinRead(void *ctx, ZyanU8* buf, ZyanUSize max_len)
{
ZYAN_UNUSED(ctx);
#ifdef ZYAN_POSIX
// `fread` does internal buffering that can result in different code paths to be taken every
// time we call it. This is detrimental for fuzzing stability in persistent mode. Use direct
// syscall when possible.
return read(0, buf, max_len);
#else
return fread(buf, 1, max_len, ZYAN_STDIN);
#endif
}

#ifdef ZYDIS_LIBFUZZER
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