Comment #2 on issue 56134 by evv...@gmail.com: elfutils:fuzz-libdwfl: Use-of-uninitialized-value in check_section https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=56134#c2
It can be confirmed with Valgrind: ``` wget -O OSS-FUZZ-56134 'https://oss-fuzz.com/download?testcase_id=6724057145147392' LD_LIBRARY_PATH="$(pwd)/libdw:$(pwd)/libelf" DEBUGINFOD_URLS= valgrind --track-origins=yes ./src/readelf -w OSS-FUZZ-56134 ==1373524== Memcheck, a memory error detector ==1373524== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al. ==1373524== Using Valgrind-3.19.0 and LibVEX; rerun with -h for copyright info ==1373524== Command: ./src/readelf -w OSS-FUZZ-56134 ==1373524== ==1373524== Conditional jump or move depends on uninitialised value(s) ==1373524== at 0x4887EAB: check_section (dwarf_begin_elf.c:265) ==1373524== by 0x48885EF: global_read (dwarf_begin_elf.c:444) ==1373524== by 0x48885EF: dwarf_begin_elf (dwarf_begin_elf.c:595) ==1373524== by 0x48A9F0C: load_dw (dwfl_module_getdwarf.c:1341) ==1373524== by 0x48AA0D0: find_dw (dwfl_module_getdwarf.c:1391) ==1373524== by 0x48AA0D0: dwfl_module_getdwarf (dwfl_module_getdwarf.c:1446) ==1373524== by 0x411109: print_debug (readelf.c:11467) ==1373524== by 0x413A31: process_elf_file (readelf.c:1062) ==1373524== by 0x4148BC: process_dwflmod (readelf.c:818) ==1373524== by 0x48A7F20: dwfl_getmodules (dwfl_getmodules.c:86) ==1373524== by 0x40954A: process_file (readelf.c:926) ==1373524== by 0x404D0E: main (readelf.c:395) ==1373524== Uninitialised value was created by a heap allocation ==1373524== at 0x484586F: malloc (vg_replace_malloc.c:381) ==1373524== by 0x48FEA25: convert_data (elf_getdata.c:166) ==1373524== by 0x48FEA25: __libelf_set_data_list_rdlock (elf_getdata.c:455) ==1373524== by 0x48FEC17: __elf_getdata_rdlock (elf_getdata.c:562) ==1373524== by 0x4887E6F: check_section (dwarf_begin_elf.c:246) ==1373524== by 0x48885EF: global_read (dwarf_begin_elf.c:444) ==1373524== by 0x48885EF: dwarf_begin_elf (dwarf_begin_elf.c:595) ==1373524== by 0x48A9F0C: load_dw (dwfl_module_getdwarf.c:1341) ==1373524== by 0x48AA0D0: find_dw (dwfl_module_getdwarf.c:1391) ==1373524== by 0x48AA0D0: dwfl_module_getdwarf (dwfl_module_getdwarf.c:1446) ==1373524== by 0x411109: print_debug (readelf.c:11467) ==1373524== by 0x413A31: process_elf_file (readelf.c:1062) ==1373524== by 0x4148BC: process_dwflmod (readelf.c:818) ==1373524== by 0x48A7F20: dwfl_getmodules (dwfl_getmodules.c:86) ==1373524== by 0x40954A: process_file (readelf.c:926) ==1373524== ./src/readelf: cannot get debug context descriptor: No DWARF information found ``` -- 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.
