Date: Wed, 30 Aug 2017 15:20:38 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com 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 > http://www.openwall.com/lists/musl/2017/04/10/3 > > 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: > > http://pubs.opengroup.org/onlinepubs/009695399/basedefs/stdarg.h.html (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. Rich
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