Comment #1 on issue 45636 by [email protected]: elfutils:fuzz-libdwfl: Crash
in read_long_names
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=45636#c1
ASAN report
=================================================================
==746==ERROR: AddressSanitizer: unknown-crash on address 0x7f1a9af3d000 at pc
0x00000048a379 bp 0x7ffeb1d3c230 sp 0x7ffeb1d3b9e8
READ of size 985 at 0x7f1a9af3d000 thread T0
SCARINESS: 16 (multi-byte-read-unknown-crash)
#0 0x48a378 in __interceptor_atol
/src/llvm-project/compiler-rt/lib/asan/asan_interceptors.cpp:522:3
#1 0x5b4615 in read_long_names /src/elfutils/libelf/elf_begin.c:766:13
#2 0x5b2aa4 in __libelf_next_arhdr_wrlock
/src/elfutils/libelf/elf_begin.c:912:8
#3 0x5b6d7d in dup_elf /src/elfutils/libelf/elf_begin.c:1061:10
#4 0x5b5028 in lock_dup_elf /src/elfutils/libelf/elf_begin.c:1119:10
#5 0x5b4e36 in elf_begin /src/elfutils/libelf/elf_begin.c:0
#6 0x4db735 in process_archive /src/elfutils/libdwfl/offline.c:251:17
#7 0x4db181 in process_file /src/elfutils/libdwfl/offline.c:125:14
#8 0x4daf3b in __libdwfl_report_offline
/src/elfutils/libdwfl/offline.c:287:22
#9 0x4db2a2 in dwfl_report_offline /src/elfutils/libdwfl/offline.c:316:10
#10 0x4d842f in LLVMFuzzerTestOneInput /src/fuzz-libdwfl.c:47:22
#11 0x4d8225 in ExecuteFilesOnyByOne
aflplusplus/utils/aflpp_driver/aflpp_driver.c:191:7
#12 0x4d8095 in main aflplusplus/utils/aflpp_driver/aflpp_driver.c:0
#13 0x7f1a9bd060b2 in __libc_start_main
/build/glibc-eX1tMB/glibc-2.31/csu/libc-start.c:308:16
#14 0x41e58d in _start
Address 0x7f1a9af3d000 is a wild pointer inside of access range of size
0x0000000003d9.
SUMMARY: AddressSanitizer: unknown-crash
(/mnt/scratch0/clusterfuzz/bot/builds/clusterfuzz-builds-afl_elfutils_b7ca3a6bcc40cef461446d759ca780e6ea3657cd/revisions/fuzz-libdwfl+0x48a378)
Shadow bytes around the buggy address:
0x0fe3d35df9b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe3d35df9c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe3d35df9d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe3d35df9e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0fe3d35df9f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0fe3d35dfa00:[fe]fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
0x0fe3d35dfa10: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
0x0fe3d35dfa20: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
0x0fe3d35dfa30: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
0x0fe3d35dfa40: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
0x0fe3d35dfa50: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==746==ABORTING
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