Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

A NULL pointer dereference in the function yasm_expr__copy_except() libyasm/expr.c:999 #174

Open
Clingto opened this issue May 19, 2021 · 0 comments

Comments

@Clingto
Copy link

Clingto commented May 19, 2021

System info:
Ubuntu 16.04.6 LTS, X64, gcc 5.4.0, yasm (latest master 009450c)
Compile Command:

$ ./autogen.sh
make distclean

CC=gcc CXX=g++ CFLAGS="-fsanitize=address -fno-omit-frame-pointer -g" CXXFLAGS="-fsanitize=address -fno-omit-frame-pointer -g" ./configure --prefix=$PWD/build --disable-shared
make -j
make install

Run Command:

$ yasm  $POC

POC file:
https://github.com/Clingto/POC/blob/master/MSA/yasm/yasm-1113-yasm_expr__copy_except-null-pointer-deref

ASAN info:

yasm: file name already has no extension: output will be in `yasm.out'
ASAN:SIGSEGV
=================================================================
==10834==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000010 (pc 0x7fdb4c7eafb3 bp 0x7fff7a57d890 sp 0x7fff7a57d840 T0)
    #0 0x7fdb4c7eafb2 in yasm_expr__copy_except  test/yasm-uaf/SRC_asan/libyasm/expr.c:999
    #1 0x7fdb4908fad6 in nasm_parser_directive  test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parse.c:1584
    #2 0x7fdb4909bd3c in parse_line  test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parse.c:377
    #3 0x7fdb4909bd3c in nasm_parser_parse  test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parse.c:231
    #4 0x7fdb4908f36b in nasm_do_parse  test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parser.c:66
    #5 0x7fdb4908f36b in nasm_parser_do_parse  test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parser.c:83
    #6 0x402c84 in do_assemble  test/yasm-uaf/SRC_asan/frontends/yasm/yasm.c:521
    #7 0x402c84 in main  test/yasm-uaf/SRC_asan/frontends/yasm/yasm.c:753
    #8 0x7fdb4c21382f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #9 0x403ee8 in _start ( test/yasm-uaf/bin_asan/bin/yasm+0x403ee8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV  test/yasm-uaf/SRC_asan/libyasm/expr.c:999 yasm_expr__copy_except
==10834==ABORTING
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
None yet
Projects
None yet
Development

No branches or pull requests

1 participant