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Date: Tue, 06 Mar 2012 07:50:21 +0000 From: "Jan Beulich" <JBeulich@...e.com> To: "Joe Perches" <joe@...ches.com> Cc: <akpm@...ux-foundation.org>, "Linus Torvalds" <torvalds@...ux-foundation.org>, <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] vsprintf: make %pV handling compatible with kasprintf() >>> On 05.03.12 at 18:02, Joe Perches <joe@...ches.com> wrote: > On Mon, 2012-03-05 at 16:49 +0000, Jan Beulich wrote: >> kasprintf() (and potentially other functions that I didn't run across >> so far) want to evaluate argument lists twice. Caring to do so for the >> primary list is obviously their job, but they can't reasonably be >> expected to check the format string for instances of %pV, which however >> need special handling too: On architectures like x86-64 (as opposed to >> e.g. ix86), using the same argument list twice doesn't produce the >> expected results, as an internally managed cursor gets updated during >> the first run. >> >> Fix the problem by always acting on a copy of the original list when >> handling %pV. > > Wouldn't stable need this too? Possibly, but I'm not certain - this is more of a latent bug that I ran into with some not yet submitted Xen code. And I'm not sure whether latent bugs qualify for stable... Jan -- 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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