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Description
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-2134-if_condition-null-pointer-deref
ASAN info:
ASAN:SIGSEGV
=================================================================
==13685==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f1a02e5e870 bp 0x7fffcb38b530 sp 0x7fffcb38b380 T0)
#0 0x7f1a02e5e86f in if_condition test/yasm-uaf/SRC_asan/modules/preprocs/nasm/nasm-pp.c:2134
#1 0x7f1a02eb88c7 in do_directive test/yasm-uaf/SRC_asan/modules/preprocs/nasm/nasm-pp.c:2907
#2 0x7f1a02ec0333 in pp_getline test/yasm-uaf/SRC_asan/modules/preprocs/nasm/nasm-pp.c:5083
#3 0x7f1a02ea9d46 in nasm_preproc_get_line test/yasm-uaf/SRC_asan/modules/preprocs/nasm/nasm-preproc.c:198
#4 0x7f1a02e9b2ac in nasm_parser_parse test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parse.c:218
#5 0x7f1a02e8f36b in nasm_do_parse test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parser.c:66
#6 0x7f1a02e8f36b in nasm_parser_do_parse test/yasm-uaf/SRC_asan/modules/parsers/nasm/nasm-parser.c:83
#7 0x402c84 in do_assemble test/yasm-uaf/SRC_asan/frontends/yasm/yasm.c:521
#8 0x402c84 in main test/yasm-uaf/SRC_asan/frontends/yasm/yasm.c:753
#9 0x7f1a0603682f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#10 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/modules/preprocs/nasm/nasm-pp.c:2134 if_condition
==13685==ABORTINGMetadata
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