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Date: Sat, 29 Nov 2014 10:08:21 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Sasha Levin <sasha.levin@...cle.com> Cc: Ingo Molnar <mingo@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [RFC v2 1/2] compiler: use compiler to detect integer overflows On Sat, Nov 29, 2014 at 7:07 AM, Sasha Levin <sasha.levin@...cle.com> wrote: > > Since we can't just change those to unsigned Sure we can. Just cast them. A signed start/len is bogus crap, it's a random wrong type. If you want to, add a "if (len < 0) return -EINVAL;" before the cast, but treating negative numbers as big positive numbers sounds fine too. > we'd still need to do an overflow > check with signed integers somewhere. Why? It's just a type. User space can't care, and signed values make no sense anyway. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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