Date: Fri, 4 Apr 2014 17:08:37 -0400 From: Rich Felker <dalias@...ifal.cx> To: musl@...ts.openwall.com Subject: Re: printf issues On Fri, Apr 04, 2014 at 04:22:46PM -0400, Morten Welinder wrote: > Another printf issue has shown up, this time with memory corruption. > > printf ("%.3E\n", 999999999.0); > > The rounding test correctly decides that it needs to round this value > up to 1E+09. It is, however, utterly unprepared for having nowhere to > put the carry. It happily accesses and changes one or more elements > before the one that held 999999999. I suspect this may be true; if so, it's a very nice catch. Were you able to determine what data it clobbers (in practice; obviously this is compiler-specific) and whether the clobber has any observable effects? Rich
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