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@E4ck E4ck commented Jan 10, 2019

Hi, I found a stack overflow vulnerability in version 6.0.1 (other versions have not been tested yet).
Because this project can't create issues, so I am here, I apologize for my inappropriate behavior.
This is the vulnerability I found when I fuzzed sassc, it’s an unexpected surprise, hhh
build: CXX=afl-clang-fast++ CC=afl-clang-fast AFL_USE_ASAN=1 make -C sassc -j4
reproduce: cat ~/queue/crash250 | ./sassc
This is poc
This is ASAN:

AddressSanitizer:DEADLYSIGNAL
=================================================================
==55687==ERROR: AddressSanitizer: stack-overflow on address 0x7fff70b05ec8 (pc 0x00000049edf2 bp 0x7fff70b06750 sp 0x7fff70b05ed0 T0)
    #0 0x49edf1 in __interceptor_memcpy.part.37 /home/eack/llvm-install/llvm-6.0.1.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:779
    #1 0x7f5df1144808 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_append(char const*, unsigned long) (/usr/lib/x86_64-linux-gnu/libstdc++.so.6+0x120808)
    #2 0x7340cd in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::append(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) /usr/lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/basic_string.h:983:16
    #3 0x7340cd in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) /usr/lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/basic_string.h:4787
    #4 0xe79f90 in Sass::Simple_Selector::ns_name[abi:cxx11]() const /home/eack/libsass/src/ast_selectors.cpp:130:17
    #5 0xc6f668 in Sass::Inspect::operator()(Sass::Type_Selector*) /home/eack/libsass/src/inspect.cpp:894:21
    #6 0xc7317e in Sass::Inspect::operator()(Sass::Compound_Selector*) /home/eack/libsass/src/inspect.cpp:961:16
    #7 0xc73788 in Sass::Compound_Selector::perform(Sass::Operation<void>*) /home/eack/libsass/src/ast_selectors.hpp:419:5
    #8 0xc73788 in Sass::Inspect::operator()(Sass::Complex_Selector*) /home/eack/libsass/src/inspect.cpp:988
    #9 0xc74818 in Sass::Complex_Selector::perform(Sass::Operation<void>*) /home/eack/libsass/src/ast_selectors.hpp:504:5
    #10 0xc74818 in Sass::Inspect::operator()(Sass::Complex_Selector*) /home/eack/libsass/src/inspect.cpp:1026
    #11 0xc74818 in Sass::Complex_Selector::perform(Sass::Operation<void>*) /home/eack/libsass/src/ast_selectors.hpp:504:5
    #12 0xc74818 in Sass::Inspect::operator()(Sass::Complex_Selector*) /home/eack/libsass/src/inspect.cpp:1026
    #13 0xc76467 in Sass::Complex_Selector::perform(Sass::Operation<void>*) /home/eack/libsass/src/ast_selectors.hpp:504:5
    #14 0xc76467 in Sass::Inspect::operator()(Sass::Selector_List*) /home/eack/libsass/src/inspect.cpp:1063
    #15 0xc725c1 in Sass::Selector_List::perform(Sass::Operation<void>*) /home/eack/libsass/src/ast_selectors.hpp:555:5
    #16 0xc725c1 in Sass::Inspect::operator()(Sass::Wrapped_Selector*) /home/eack/libsass/src/inspect.cpp:951
    #17 0xc7317e in Sass::Inspect::operator()(Sass::Compound_Selector*) /home/eack/libsass/src/inspect.cpp:961:16
===============Omit long content===============
/home/eack/libsass/src/inspect.cpp:951
    #446 0xc7317e in Sass::Inspect::operator()(Sass::Compound_Selector*) /home/eack/libsass/src/inspect.cpp:961:16
    #447 0xc73788 in Sass::Compound_Selector::perform(Sass::Operation<void>*) /home/eack/libsass/src/ast_selectors.hpp:419:5
    #448 0xc73788 in Sass::Inspect::operator()(Sass::Complex_Selector*) /home/eack/libsass/src/inspect.cpp:988
    #449 0xc74818 in Sass::Complex_Selector::perform(Sass::Operation<void>*) /home/eack/libsass/src/ast_selectors.hpp:504:5
    #450 0xc74818 in Sass::Inspect::operator()(Sass::Complex_Selector*) /home/eack/libsass/src/inspect.cpp:1026

SUMMARY: AddressSanitizer: stack-overflow /home/eack/llvm-install/llvm-6.0.1.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:779 in __interceptor_memcpy.part.37
==55687==ABORTING

zmodem and others added 7 commits January 3, 2018 14:54
@zmodem
Creating release_60 branch off revision 321711
420c194 
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/release_60@321716 91177308-0d34-0410-b5e6-96231b3b80d8
@zmodem
Merging r323039:
8d6a4ba 
------------------------------------------------------------------------
r323039 | kamil | 2018-01-20 15:16:16 +0100 (Sat, 20 Jan 2018) | 13 lines

[compiler-rt] Implement __clear_cache() on OpenBSD/mips64

Summary:
Make __clear_cache() invoke the platform's cache flush function
on OpenBSD/mips64.

Reviewers: krytarowski

Reviewed By: krytarowski

Subscribers: sdardis, dberris, arichardson, krytarowski, llvm-commits, #sanitizers

Differential Revision: https://reviews.llvm.org/D42332
------------------------------------------------------------------------


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/release_60@323120 91177308-0d34-0410-b5e6-96231b3b80d8
@zmodem
Merging r323315:
bd2cfdd 
------------------------------------------------------------------------
r323315 | mstorsjo | 2018-01-24 11:14:52 +0100 (Wed, 24 Jan 2018) | 9 lines

[builtins] Align addresses to cache lines in __clear_cache for aarch64

This makes sure that the last cache line gets invalidated properly.

This matches the example code at
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0024a/BABJDBHI.html,
and also matches what libgcc does.

Differential Revision: https://reviews.llvm.org/D42196
------------------------------------------------------------------------


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/release_60@323338 91177308-0d34-0410-b5e6-96231b3b80d8
@zmodem
Merging r323013:
7e852d1 
------------------------------------------------------------------------
r323013 | petarj | 2018-01-20 01:06:07 +0100 (Sat, 20 Jan 2018) | 18 lines

[TSan][MIPS] Expand sanitizer memory space to lower addresses

MemToShadowImpl() maps lower addresses to a memory space out of sanitizers
range. The simplest example is address 0 which is mapped to 0x2000000000

static const uptr kShadowBeg     = 0x2400000000ull;

but accessing the address during tsan execution will lead to a segmentation
fault.

This patch expands the range used by the sanitizer and ensures that 1/8 of
the maximum valid address in the virtual address spaces is used for shadow
memory.

Patch by Milos Stojanovic.

Differential Revision: https://reviews.llvm.org/D41777

------------------------------------------------------------------------


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/release_60@323767 91177308-0d34-0410-b5e6-96231b3b80d8
@zmodem
Merging r322588:
32dfc40 
------------------------------------------------------------------------
r322588 | eugenis | 2018-01-16 20:21:45 +0100 (Tue, 16 Jan 2018) | 9 lines

[hwasan] Build runtime library with -fPIC, not -fPIE.

Summary: -fPIE can not be used when building a shared library.

Reviewers: alekseyshl, peter.smith

Subscribers: kubamracek, llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D42121
------------------------------------------------------------------------


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/release_60@323850 91177308-0d34-0410-b5e6-96231b3b80d8
@zmodem
Merging r324496:
9d61c78 
------------------------------------------------------------------------
r324496 | yroux | 2018-02-07 19:27:25 +0100 (Wed, 07 Feb 2018) | 9 lines

[asan] Fix filename size on linux platforms.

This is a a fix for:
https://bugs.llvm.org/show_bug.cgi?id=35996

Use filename limits from system headers to be synchronized with what
LD_PRELOAD can handle.

Differential Revision: https://reviews.llvm.org/D42900
------------------------------------------------------------------------


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/release_60@324506 91177308-0d34-0410-b5e6-96231b3b80d8
@tstellar
Merging r333213:
0cc8703 
------------------------------------------------------------------------
r333213 | ctopper | 2018-05-24 10:59:47 -0700 (Thu, 24 May 2018) | 16 lines

sanitizer: Use pre-computed size of struct ustat for Linux

<sys/ustat.h> has been removed from glibc 2.28 by:

commit cf2478d53ad7071e84c724a986b56fe17f4f4ca7
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Sun Mar 18 11:28:59 2018 +0800

Deprecate ustat syscall interface
This patch uses pre-computed size of struct ustat for Linux to fix

https://bugs.llvm.org/show_bug.cgi?id=37418

Patch by H.J. Lu.

Differential Revision: https://reviews.llvm.org/D47281
------------------------------------------------------------------------

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/branches/release_60@334776 91177308-0d34-0410-b5e6-96231b3b80d8
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@E4ck @zmodem @tstellar