Comment #1 on issue 45631 by [email protected]: elfutils:fuzz-libdwfl:
Use-of-uninitialized-value in __libdw_gunzip
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=45631#c1
MSAN report
Running:
/mnt/scratch0/clusterfuzz/bot/inputs/fuzzer-testcases/crash-cdd503eda6f927979a20a3bd4c08c8182cdf2ff5
==593068==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x55eeb6 in zlib_fail /src/elfutils/libdwfl/gzip.c:132:3
#1 0x55eeb6 in __libdw_gunzip /src/elfutils/libdwfl/gzip.c:387:11
#2 0x540817 in decompress /src/elfutils/libdwfl/open.c:66:11
#3 0x5400d7 in what_kind /src/elfutils/libdwfl/open.c:114:12
#4 0x5400d7 in libdw_open_elf /src/elfutils/libdwfl/open.c:134:22
#5 0x53f505 in __libdw_open_file /src/elfutils/libdwfl/open.c:197:10
#6 0x52cea7 in __libdwfl_report_offline
/src/elfutils/libdwfl/offline.c:281:22
#7 0x52cea7 in dwfl_report_offline /src/elfutils/libdwfl/offline.c:316:10
#8 0x52747b in LLVMFuzzerTestOneInput /src/fuzz-libdwfl.c:47:22
#9 0x4552f2 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*,
unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
#10 0x440ea2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned
long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6
#11 0x44670c in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char
const*, unsigned long))
/src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:860:9
#12 0x46f0a2 in main
/src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
#13 0x7f5b32dd40b2 in __libc_start_main
/build/glibc-eX1tMB/glibc-2.31/csu/libc-start.c:308:16
#14 0x41f5ed in _start
Uninitialized value was created by an allocation of 'code' in the stack frame
of function '__libdw_gunzip'
#0 0x55cde0 in __libdw_gunzip /src/elfutils/libdwfl/gzip.c:184
SUMMARY: MemorySanitizer: use-of-uninitialized-value
(/mnt/scratch0/clusterfuzz/bot/builds/clusterfuzz-builds_elfutils_3ee01cb67db1a71e7adeb7f3f14722ea62f13cd5/revisions/fuzz-libdwfl+0x55eeb6)
Unique heap origins: 44
Stack depot allocated bytes: 1638400
Unique origin histories: 7
History depot allocated bytes: 196608
Exiting
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