[llvm-dev] Using ASAN suppressions in mixed-instrumented environments

Zachary Turner via llvm-dev llvm-dev at lists.llvm.org
Wed Oct 2 09:55:04 PDT 2019

I've got an application I built with -fsanitize=address, and I'm linking
against a third party library foo.a which was not built with
-fsanitize=address.  Both of these libraries use -stdlib=libc++.

In my code I do something like this:

// This code is instrumented
void MyProgram() {
    std::vector<std::string> v;
    std::string s;
    Library::DoSomethingUseful(v, s);

And this is implemented as:

// This code is not instrumented:
namespace Library {
    void DoSomethingUseful(std::vector<std::string> &v, const std::string
&s) {
        for (int i=0; i < 10; ++i)

This results in an ASAN container-overflow in libc++, which makes sense
because the library's version isn't instrumented.  Is there any way to
suppress this?

The actual call-stack looks like this:

==120108==ERROR: AddressSanitizer: container-overflow on address
0x60800002e4e8 at pc 0x562899512022 bp 0x7ffc0ad94d10 sp 0x7ffc0ad944c0
READ of size 24 at 0x60800002e4e8 thread T0
    #0 0x562899512021 in __asan_memcpy (MyProgram+0x22c7021)
    #1 0x562899609a51 in std::string::basic_string(std::string&&)
    #2 0x562899609a51 in void
std::allocator<std::string>::construct<std::string, std::string
>(std::string*, std::string&&) /usr/include/c++/v1/memory:1805
    #3 0x562899609a51 in void
>::__construct<std::string, std::string >(std::__1::integral_constant<bool,
true>, std::allocator<std::string>&, std::string*, std::string&&)
    #4 0x562899609a51 in void
std::allocator_traits<std::allocator<std::string> >::construct<std::string,
std::string >(std::allocator<std::string>&, std::string*, std::string&&)
    #5 0x562899609a51 in void
std::string*, std::string*, std::string*&) /usr/include/c++/v1/memory:1677
    #6 0x562899609a51 in std::__1::vector<std::string,
std::allocator<std::string>&>&) /usr/include/c++/v1/vector:898
    #7 0x562899608928 in void std::__1::vector<std::string,
std::allocator<std::string> >::__push_back_slow_path<std::string
const&>(std::string const&) /usr/include/c++/v1/vector:1582:5
    #8 0x56289f792aa9 in std::__1::vector<std::string,
std::allocator<std::string> >::push_back(std::string const&)
    #9 0x56289f792aa9 in
MyLibrary::DoSomethingUseful(std::vector<std::string>&, std::string const&)

It's not reasonable for me to suppress everything that might happen in
libc++, because I might have an actual violation which occurs from
instrumented code.

I can disable container-overflow but that seems suboptimal too.

Is there a good workaround for this situation?  Ideally I'd like to use an
LSAN-style suppression that allows me to match anywhere in the callstack,
but this doesn't appear to be supported.

Advice appreciated.
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