Hi All,
I'd like to report a defect in tar v1.30.
Execution of the following command will cause a heap-based buffer overflow:
-- cut --
$ ~/tar-asan/src/tar -c -f none --add-file= -g none
=================================================================
==7359==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x608000000110 at pc 0x55d81c0bc341 bp 0x7ffd7d643f30 sp
0x7ffd7d643f28
READ of size 8 at 0x608000000110 thread T0
#0 0x55d81c0bc340 in collect_and_sort_names
/home/s1m0n/tar/tar-asan/src/names.c:1824
#1 0x55d81c03abb5 in create_archive
/home/s1m0n/tar/tar-asan/src/create.c:1363
#2 0x55d81bffd2b0 in main /home/s1m0n/tar/tar-asan/src/tar.c:2724
#3 0x7f97f2cedb16 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x22b16)
#4 0x55d81c002aa9 in _start (/home/s1m0n/tar/tar-asan/src/tar+0x9eaa9)
Address 0x608000000110 is a wild pointer.
SUMMARY: AddressSanitizer: heap-buffer-overflow
/home/s1m0n/tar/tar-asan/src/names.c:1824 in collect_and_sort_names
Shadow bytes around the buggy address:
0x0c107fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c107fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c107fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c107fff8000: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 fa
0x0c107fff8010: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c107fff8020: fa fa[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c107fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c107fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c107fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c107fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c107fff8070: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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
==7359==ABORTING
-- cut --
Please let me know if you have any questions.
Thanks,
Filip Palian
