Comment #3 on issue 43505 by evv...@gmail.com: elfutils:fuzz-dwfl-core: Use-of-uninitialized-value in handle_file_note https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=43505#c3
Looking at another issue that hasn't been reported by OSS-Fuzz yet: ``` Running: /mnt/scratch0/clusterfuzz/bot/inputs/fuzzer-testcases/crash-57876e6ee0a1504e6fa0b22336043846f283f4a2 ==742==WARNING: MemorySanitizer: use-of-uninitialized-value #0 0x6374a5 in dwfl_segment_report_module /src/elfutils/libdwfl/dwfl_segment_report_module.c:401:11 #1 0x537d0d in dwfl_core_file_report /src/elfutils/libdwfl/core-file.c:563:17 #2 0x528aa5 in LLVMFuzzerTestOneInput /src/fuzz-dwfl-core.c:52:6 #3 0x455243 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) cxa_noexception.cpp:0 #4 0x440e92 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6 #5 0x4466dc in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) cxa_noexception.cpp:0 #6 0x46f4a2 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10 #7 0x7f5d0ddbc0b2 in __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/libc-start.c:308:16 #8 0x41f60d in _start Uninitialized value was created by an allocation of 'ehdr' in the stack frame of function 'dwfl_segment_report_module' #0 0x62d610 in dwfl_segment_report_module /src/elfutils/libdwfl/dwfl_segment_report_module.c:301 ``` it seems MSan doesn't like unions that aren't initialized explicitly -- You received this message because: 1. You were specifically CC'd on the issue You may adjust your notification preferences at: https://bugs.chromium.org/hosting/settings Reply to this email to add a comment.