[llvm] r180094 - Tell MSan that memory initialized by libz is valid

[Rafael Ávila De Espíndola]

What about the dynamic instrumentation? It is not enabled by default?

Sent from my iPhone

On 2013-04-25, at 15:13, Reid Kleckner <rnk at google.com> wrote:

> On Thu, Apr 25, 2013 at 2:06 PM, Nick Lewycky <nicholas at mxc.ca> wrote:
>> On 04/23/2013 05:17 AM, Alexey Samsonov wrote:
>>> 
>>> Author: samsonov
>>> Date: Tue Apr 23 07:17:46 2013
>>> New Revision: 180094
>>> 
>>> URL: http://llvm.org/viewvc/llvm-project?rev=180094&view=rev
>>> Log:
>>> Tell MSan that memory initialized by libz is valid
>> 
>> 
>> Why doesn't msan instrument this correctly? Or is libz not initializing all
>> this memory?
> 
> LLVM is using libz installed on the system, so it's not compiled with
> msan.  Therefore msan can't see it initialize the memory.  One way to
> solve this is to write custom interceptors around the interfaces that
> mark output buffers and parameters as initialized.
> 
> The alternative is to compile the world, which Evgeniy was pretty much
> able to do for LLVM until libz was added.
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