Date: Tue, 12 Jan 2016 15:25:57 +0300 From: Alexander Cherepanov <ch3root@...nwall.com> To: musl@...ts.openwall.com Subject: Re: Possible infinite loop in qsort() On 2016-01-10 14:38, Markus Wichmann wrote: > On Sat, Jan 09, 2016 at 11:05:16PM -0500, Rich Felker wrote: >> On Sat, Jan 09, 2016 at 10:07:19AM +0100, Felix Janda wrote: >>> musl enforces that object sizes should not be greater than PTRDIFF_MAX. >>> See for example the discussion at >>> >>> http://www.openwall.com/lists/musl/2013/06/27/7 >>> >>> So there will not be objects of size 3GB with musl on x32. Since the >>> Leonardo numbers grow slower than 2^n in general no overflow should >>> happen if "size" is valid. Otherwise, UB was invoked. >> > > OK. Might want to make that assumption a bit more prominent, because > this is the first time I've ever heard about it, but OK, no objects >2GB > on 32-bit archs. Yeah, I don't see it in the doc. Did I miss it? If it neither works nor documented as a limit I'd call it a bug. BTW the support in compilers for working with objects larger than half the address space is buggy -- see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67999 . The same situation -- it neither works nor documented. Somewhat puzzling... -- Alexander Cherepanov
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