[cfe-dev] Clang sanitizer blacklist format?

[Jeffrey Walton]

> I'm catching lots of these (in the hundreds). I'm fairly certain its
> little more than `cout << std::hex`.
>
> 0x00010dd6589b: runtime error: load of value 4294967221, which is not
> a valid value for type 'std::_Ios_Fmtflags'
>  e8  e4 90 65 00 e9 de fd ff  ff 4c 89 ff e8 f9 f7 65  00 48 8d 3d f0
> 5f a6 00  4c 89 fe e8 88 6f 65

The blacklist worked great with:

    -fsanitize-blacklist=my_ignores.txt

It needed one entry:

    fun:_Ios_Fmtflags

This is the only place I've been able to find docs on the blacklist
and its format, though:
http://code.google.com/p/address-sanitizer/wiki/AddressSanitizer.

Jeff

On Wed, Jul 31, 2013 at 5:47 AM, Jeffrey Walton <noloader at gmail.com> wrote:
> Hi All,
>
> I'm catching lots of these (in the hundreds). I'm fairly certain its
> little more than `cout << std::hex`.
>
> 0x00010dd6589b: runtime error: load of value 4294967221, which is not
> a valid value for type 'std::_Ios_Fmtflags'
>  e8  e4 90 65 00 e9 de fd ff  ff 4c 89 ff e8 f9 f7 65  00 48 8d 3d f0
> 5f a6 00  4c 89 fe e8 88 6f 65
>
> The problem appears to be with libstdc++, and a patch was prepared at
> http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-January/027401.html.
>
> Until the update is available, I'd like to use a blacklist to suppress
> the finding. The sanitizer blacklist was added at
> http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20121126/068959.html.
>
> Can we create the blacklist file and fill it with functions like
> 'std::_Ios_Fmtflags', with on per line? Or does it need a tuple with
> <sanitizer>:std::_Ios_Fmtflags? If so, how can we determine which
> sanitizer is producing the finding when multiple sanitizers are used
> (I believe its -fsanitize=undefined)?
>
> To summarize, what is the format of the blacklist file?