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Protect against large inputs to the fuzz testers #156

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Merged
jkbonfield merged 2 commits into from
Oct 14, 2026
Merged

Protect against large inputs to the fuzz testers #156

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62ad30f
Remove MSSSE3 and MPOPCNT from "make fuzz" target
jkbonfield Oct 12, 2026
39a5cc8
Protect against large inputs to the fuzz testers
jkbonfield Oct 12, 2026
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2 changes: 1 addition & 1 deletion htscodecs/Makefile.am
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Expand Up @@ -104,7 +104,7 @@ libcodecsfuzz_a_SOURCES = $(libhtscodecs_base_src)
libcodecsfuzz_a_CFLAGS = -fsanitize=fuzzer -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
libcodecsfuzz_a-htscodecs.$(OBJEXT): version.h
libcodecsfuzz_sse4_a_SOURCES = rANS_static32x16pr_sse4.c
libcodecsfuzz_sse4_a_CFLAGS = $(libcodecsfuzz_a_CFLAGS) @MSSE4_1@ @MSSSE3@ @MPOPCNT@
libcodecsfuzz_sse4_a_CFLAGS = $(libcodecsfuzz_a_CFLAGS) @MSSE4_1@
libcodecsfuzz_avx2_a_SOURCES = rANS_static32x16pr_avx2.c
libcodecsfuzz_avx2_a_CFLAGS = $(libcodecsfuzz_a_CFLAGS) @MAVX2@
libcodecsfuzz_avx512_a_SOURCES = rANS_static32x16pr_avx512.c
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4 changes: 4 additions & 0 deletions tests/fqzcomp_qual_fuzzrt.c
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Expand Up @@ -103,6 +103,10 @@ fqz_slice *fake_slice(size_t buf_len, int nrec) {
int LLVMFuzzerTestOneInput(uint8_t *in, size_t in_size) {
size_t c_size, u_size;

// fake_slice() may need one slice_len[] entry per input byte
if (in_size > MAX_REC)
return -1;

int mode = 0;
for (mode = 0; mode < 3; mode++) {
int mval[3] = {0,1,in_size};
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2 changes: 1 addition & 1 deletion tests/tokenise_name3_fuzzrt.c
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Expand Up @@ -61,7 +61,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *in, size_t in_sz) {
char in2[8192];

// 4096 is default max size for libfuzzer anyway
if (in_sz > 8192)
if (in_sz+1 > sizeof(in2)) // +1 for nul below
return -1;

// Turn newlines to nuls so we can do round-trip testing
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