Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Wed, 30 Aug 2017 15:20:38 -0400
From: Rich Felker <>
Subject: Re: open issues

On Wed, Aug 30, 2017 at 08:26:46AM +0000, Pascal Cuoq wrote:
> Hello,
> Punting til later due to lack of serious/any outward symptoms and lack
> of any practical way to fix:
> - scanf, wrong types in va_arg
> Joseph Myers has pointed out to me that the POSIX chapter about
> stdarg.h defines an XSI extension that allows musl's scanf to be
> written just the way it is:
>  (specifically the sentence “Both types are pointers”)
> To me, this means that the issue can be dropped entirely : musl
> simply needs this XSI extension, as it probably does some others.

Great find. I wonder if compiler/diagnostic tool ppl are aware of this
extension to the C language that XSI imposes. It definitely affects
things like UBSan, and of course compilers' optimization based on
assumptions that UB doesn't happen.


Powered by blists - more mailing lists

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.