I see no problems with committing mach_override to gcc.
The code should be verbatim copy from
llvm/projects/compiler-rt/lib/interception/mach_override
Note that this code comes with an MIT license and was not developed by
Google (we did add quite a few patches).
Sorry for delay with replies, I am lagging behind emails.
Also, Alexander Potapenko is the best person to ask about asan-darwin.
Maybe we can add him to the list of sanitizer maintainers?
--kcc
On Thu, Nov 15, 2012 at 11:41 AM, Jack Howarth <howa...@bromo.med.uc.edu> wrote:
> On Thu, Nov 01, 2012 at 08:52:33PM +0100, do...@redhat.com wrote:
>> From: Dodji Seketeli <do...@seketeli.org>
>>
>> Hello,
>>
>> The set of patches following this message represents the work that
>> happened on the asan branch to build up the Address Sanitizer work
>> started in the Google branch.
>>
>> Address Sanitizer (aka asan) is a memory error detector. It finds
>> use-after-free and {heap,stack,global}-buffer overflow bugs in C/C++
>> programs.
>>
>> One can learn about the way it works by reading the pdf slides at [1],
>> or by reading the documentation on the wiki page of the project at [2].
>>
>> To make a long story short, it works by associating each memory region
>> of eight consecutive bytes with a shadow byte that tells whether if
>> each byte of the memory region is addressable or not. So,
>> conceptually, there is a function 'MemToShadow' which, for each set of
>> contiguous eight bytes of memory returns a shadow byte that tells
>> whether if each byte is accessible or not.
>>
>> Then, each memory access is instrumented by the asan pass to retrieve
>> the shadow byte of the accessed memory; if the access is to a memory
>> address that is deemed non-accessible, a call to an asan runtime
>> library function is issued to report a meaningful error to the user,
>> and the access is performed, letting the user program proceed despite
>> the error.
>>
>> The advantage of this approach, compared to say, Valgrind[4] is the
>> lower time and space overhead. Eventually, when this tool becomes
>> more solid, it'll become complementary to Valgrind.
>>
>> Apart from the compiler components, asan needs a runtime library to
>> function. We share that library with the LLVM implementation of asan
>> that is described at [3]. The last patch of the set imports this
>> library in its pristine form into our tree. The plan is to regularly
>> synchronize it with its LLVM upstream repository.
>>
>> On behalf of the GCC asan developers listed below, I am thus proposing
>> these patches for inclusion into trunk. I chose to follow the
>> chronological commits that happened on the [asan] branch, to ease the
>> authorship propagation. Except for some few exceptions, each of these
>> commits are reasonably logically atomic, so they hopefully shouldn't
>> be too hard to review.
>>
>> The first patch is the initial import of the asan state from the
>> Google branch into the [asan] branch. Subsequent patches clean the
>> code up, add features like protection of stack and global variables,
>> instrumentation of memory access through built-in functions, and, last
>> but not least, the import of the runtime library.
>>
>> Please note that the ChangeLog.asan is meant to disappear at commit
>> time, as its content will be updated (for the dates) and prepended to
>> the normal ChangeLog file.
>>
>> One noticeable shortcoming that we have at the moment is the lack of a
>> DejaGNU test harness for this. This is planned to be addressed as
>> soon as possible.
>>
>> Please find below is a summary of the patches of the set.
>>
>> Thanks.
>>
>> [1]:
>> http://gcc.gnu.org/wiki/cauldron2012?action=AttachFile&do=get&target=kcc.pdf
>> [2]:
>> http://code.google.com/p/address-sanitizer/wiki/AddressSanitizerAlgorithm
>> [3]: http://code.google.com/p/address-sanitizer/w/list
>> [4]: http://www.valgrind.org
>>
>> Diego Novillo (2):
>> Initial import of asan from the Google branch
>> Rename tree-asan.[ch] to asan.[ch]
>>
>> Dodji Seketeli (3):
>> Make build_check_stmt accept an SSA_NAME for its base
>> Factorize condition insertion code out of build_check_stmt
>> Instrument built-in memory access function calls
>>
>> Jakub Jelinek (6):
>> Initial asan cleanups
>> Emit GIMPLE directly instead of gimplifying GENERIC.
>> Allow asan at -O0
>> Implement protection of stack variables
>> Implement protection of global variables
>> Fix a couple of ICEs.
>>
>> Wei Mi (2):
>> Don't forget to protect 32 bytes aligned global variables.
>> Import the asan runtime library into GCC tree
>>
>> ChangeLog.asan | 7 +
>> Makefile.def | 2 +
>> Makefile.in | 487 +-
>> configure | 1 +
>> configure.ac | 1 +
>> gcc/ChangeLog.asan | 175 +
>> gcc/Makefile.in | 10 +-
>> gcc/asan.c | 1495 ++
>> gcc/asan.h | 70 +
>> gcc/cfgexpand.c | 165 +-
>> gcc/common.opt | 4 +
>> gcc/config/i386/i386.c | 11 +
>> gcc/doc/invoke.texi | 8 +-
>> gcc/doc/tm.texi | 6 +
>> gcc/doc/tm.texi.in | 2 +
>> gcc/gcc.c | 1 +
>> gcc/passes.c | 2 +
>> gcc/target.def | 11 +
>> gcc/toplev.c | 14 +
>> gcc/tree-pass.h | 2 +
>> gcc/varasm.c | 22 +
>> libasan/ChangeLog.asan | 3 +
>> libasan/LICENSE.TXT | 97 +
>> libasan/Makefile.am | 98 +
>> libasan/Makefile.in | 992 ++
>> libasan/README.gcc | 4 +
>> libasan/aclocal.m4 | 9645 ++++++++++
>> libasan/asan_allocator.cc | 1045 ++
>> libasan/asan_allocator.h | 177 +
>> libasan/asan_flags.h | 103 +
>> libasan/asan_globals.cc | 206 +
>> libasan/asan_intercepted_functions.h | 217 +
>> libasan/asan_interceptors.cc | 704 +
>> libasan/asan_interceptors.h | 39 +
>> libasan/asan_internal.h | 169 +
>> libasan/asan_linux.cc | 150 +
>> libasan/asan_lock.h | 40 +
>> libasan/asan_mac.cc | 526 +
>> libasan/asan_mac.h | 54 +
>> libasan/asan_malloc_linux.cc | 142 +
>> libasan/asan_malloc_mac.cc | 427 +
>> libasan/asan_malloc_win.cc | 140 +
>> libasan/asan_mapping.h | 120 +
>> libasan/asan_new_delete.cc | 54 +
>> libasan/asan_poisoning.cc | 151 +
>> libasan/asan_posix.cc | 118 +
>> libasan/asan_report.cc | 492 +
>> libasan/asan_report.h | 51 +
>> libasan/asan_rtl.cc | 404 +
>> libasan/asan_stack.cc | 35 +
>> libasan/asan_stack.h | 52 +
>> libasan/asan_stats.cc | 86 +
>> libasan/asan_stats.h | 65 +
>> libasan/asan_thread.cc | 153 +
>> libasan/asan_thread.h | 103 +
>> libasan/asan_thread_registry.cc | 188 +
>> libasan/asan_thread_registry.h | 83 +
>> libasan/asan_win.cc | 190 +
>> libasan/config.guess | 1530 ++
>> libasan/config.sub | 1773 ++
>> libasan/configure | 17515
>> +++++++++++++++++++
>> libasan/configure.ac | 67 +
>> libasan/depcomp | 630 +
>> libasan/include/sanitizer/asan_interface.h | 197 +
>> libasan/include/sanitizer/common_interface_defs.h | 66 +
>> libasan/install-sh | 527 +
>> libasan/interception/interception.h | 195 +
>> libasan/interception/interception_linux.cc | 28 +
>> libasan/interception/interception_linux.h | 35 +
>> libasan/interception/interception_mac.cc | 29 +
>> libasan/interception/interception_mac.h | 47 +
>> libasan/interception/interception_win.cc | 149 +
>> libasan/interception/interception_win.h | 43 +
>> libasan/libtool-version | 6 +
>> libasan/ltmain.sh | 9661 ++++++++++
>> libasan/missing | 376 +
>> libasan/sanitizer_common/sanitizer_allocator.cc | 83 +
>> libasan/sanitizer_common/sanitizer_allocator64.h | 573 +
>> libasan/sanitizer_common/sanitizer_atomic.h | 63 +
>> libasan/sanitizer_common/sanitizer_atomic_clang.h | 120 +
>> libasan/sanitizer_common/sanitizer_atomic_msvc.h | 134 +
>> libasan/sanitizer_common/sanitizer_common.cc | 151 +
>> libasan/sanitizer_common/sanitizer_common.h | 181 +
>> libasan/sanitizer_common/sanitizer_flags.cc | 95 +
>> libasan/sanitizer_common/sanitizer_flags.h | 25 +
>> libasan/sanitizer_common/sanitizer_internal_defs.h | 186 +
>> libasan/sanitizer_common/sanitizer_libc.cc | 189 +
>> libasan/sanitizer_common/sanitizer_libc.h | 69 +
>> libasan/sanitizer_common/sanitizer_linux.cc | 296 +
>> libasan/sanitizer_common/sanitizer_list.h | 118 +
>> libasan/sanitizer_common/sanitizer_mac.cc | 249 +
>> libasan/sanitizer_common/sanitizer_mutex.h | 106 +
>> libasan/sanitizer_common/sanitizer_placement_new.h | 31 +
>> libasan/sanitizer_common/sanitizer_posix.cc | 187 +
>> libasan/sanitizer_common/sanitizer_printf.cc | 196 +
>> libasan/sanitizer_common/sanitizer_procmaps.h | 95 +
>> libasan/sanitizer_common/sanitizer_stackdepot.cc | 194 +
>> libasan/sanitizer_common/sanitizer_stackdepot.h | 27 +
>> libasan/sanitizer_common/sanitizer_stacktrace.cc | 245 +
>> libasan/sanitizer_common/sanitizer_stacktrace.h | 73 +
>> libasan/sanitizer_common/sanitizer_symbolizer.cc | 311 +
>> libasan/sanitizer_common/sanitizer_symbolizer.h | 97 +
>> .../sanitizer_common/sanitizer_symbolizer_linux.cc | 162 +
>> .../sanitizer_common/sanitizer_symbolizer_mac.cc | 31 +
>> .../sanitizer_common/sanitizer_symbolizer_win.cc | 33 +
>> libasan/sanitizer_common/sanitizer_win.cc | 205 +
>> 106 files changed, 57193 insertions(+), 25 deletions(-)
>> create mode 100644 ChangeLog.asan
>> create mode 100644 gcc/ChangeLog.asan
>> create mode 100644 gcc/asan.c
>> create mode 100644 gcc/asan.h
>> create mode 100644 libasan/ChangeLog.asan
>> create mode 100644 libasan/LICENSE.TXT
>> create mode 100644 libasan/Makefile.am
>> create mode 100644 libasan/Makefile.in
>> create mode 100644 libasan/README.gcc
>> create mode 100644 libasan/aclocal.m4
>> create mode 100644 libasan/asan_allocator.cc
>> create mode 100644 libasan/asan_allocator.h
>> create mode 100644 libasan/asan_flags.h
>> create mode 100644 libasan/asan_globals.cc
>> create mode 100644 libasan/asan_intercepted_functions.h
>> create mode 100644 libasan/asan_interceptors.cc
>> create mode 100644 libasan/asan_interceptors.h
>> create mode 100644 libasan/asan_internal.h
>> create mode 100644 libasan/asan_linux.cc
>> create mode 100644 libasan/asan_lock.h
>> create mode 100644 libasan/asan_mac.cc
>> create mode 100644 libasan/asan_mac.h
>> create mode 100644 libasan/asan_malloc_linux.cc
>> create mode 100644 libasan/asan_malloc_mac.cc
>> create mode 100644 libasan/asan_malloc_win.cc
>> create mode 100644 libasan/asan_mapping.h
>> create mode 100644 libasan/asan_new_delete.cc
>> create mode 100644 libasan/asan_poisoning.cc
>> create mode 100644 libasan/asan_posix.cc
>> create mode 100644 libasan/asan_report.cc
>> create mode 100644 libasan/asan_report.h
>> create mode 100644 libasan/asan_rtl.cc
>> create mode 100644 libasan/asan_stack.cc
>> create mode 100644 libasan/asan_stack.h
>> create mode 100644 libasan/asan_stats.cc
>> create mode 100644 libasan/asan_stats.h
>> create mode 100644 libasan/asan_thread.cc
>> create mode 100644 libasan/asan_thread.h
>> create mode 100644 libasan/asan_thread_registry.cc
>> create mode 100644 libasan/asan_thread_registry.h
>> create mode 100644 libasan/asan_win.cc
>> create mode 100644 libasan/config.guess
>> create mode 100644 libasan/config.sub
>> create mode 100644 libasan/configure
>> create mode 100644 libasan/configure.ac
>> create mode 100644 libasan/depcomp
>> create mode 100644 libasan/include/sanitizer/asan_interface.h
>> create mode 100644 libasan/include/sanitizer/common_interface_defs.h
>> create mode 100644 libasan/install-sh
>> create mode 100644 libasan/interception/interception.h
>> create mode 100644 libasan/interception/interception_linux.cc
>> create mode 100644 libasan/interception/interception_linux.h
>> create mode 100644 libasan/interception/interception_mac.cc
>> create mode 100644 libasan/interception/interception_mac.h
>> create mode 100644 libasan/interception/interception_win.cc
>> create mode 100644 libasan/interception/interception_win.h
>> create mode 100644 libasan/libtool-version
>> create mode 100644 libasan/ltmain.sh
>> create mode 100644 libasan/missing
>> create mode 100644 libasan/sanitizer_common/sanitizer_allocator.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_allocator64.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_atomic.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_atomic_clang.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_atomic_msvc.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_common.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_common.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_flags.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_flags.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_internal_defs.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_libc.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_libc.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_linux.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_list.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_mac.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_mutex.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_placement_new.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_posix.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_printf.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_procmaps.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_stackdepot.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_stackdepot.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_stacktrace.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_stacktrace.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_symbolizer.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_symbolizer.h
>> create mode 100644 libasan/sanitizer_common/sanitizer_symbolizer_linux.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_symbolizer_mac.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_symbolizer_win.cc
>> create mode 100644 libasan/sanitizer_common/sanitizer_win.cc
>>
>
> Dodji,
> The Google branch is missing the required
> interception/mach_override/mach_override.h
> and interception/mach_override/mach_override.c files from compiler-rt svn for
> darwin. I have
> posted what I believe to be the final patch which eanbles libsanitizer on
> darwin...
>
> http://gcc.gnu.org/ml/gcc-patches/2012-11/msg01285.html
>
> which has been tested with the existing asan testsuite, the use-after-free.c
> testcase as
> well as the Polyhedron 2005 benchmarks for -O1 -g -fno-omit-frame-pointer
> -faddress-sanitizer
> and -O3 -funroll-loops -ffast-math -g -fno-omit-frame-pointer
> -faddress-sanitizer
> to prove that the current mach_override from upstream is sufficient for
> darwin to use.
> Due to the large number of maintainers for libsanitizer, it is unclear who is
> the person
> responsible for upstream merges to lobby for these files to be ported into
> gcc trunk.
> With Alexander Potapenko's commit of the bug fix to
> mach_override/mach_override.c
> required for FSF gcc...
>
> http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20121112/155989.html
>
> ...there really is no reason to continue to delay (as the interpose code
> simply won't
> be completed in time for gcc 4.8.0). Can we please get some movement on
> importing
> these missing files from upstream? Thanks.
> Jack
