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Message-ID: <20141113152115.GB22361@e104818-lin.cambridge.arm.com> Date: Thu, 13 Nov 2014 15:21:15 +0000 From: Catalin Marinas <catalin.marinas@....com> To: Kyle McMartin <kmcmarti@...hat.com> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "pmatouse@...hat.com" <pmatouse@...hat.com>, Will Deacon <Will.Deacon@....com>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org> Subject: Re: [PATCH] arm64: __clear_user: handle exceptions on strb On Thu, Nov 13, 2014 at 03:14:08PM +0000, Kyle McMartin wrote: > On Thu, Nov 13, 2014 at 03:06:25PM +0000, Catalin Marinas wrote: > > On Wed, Nov 12, 2014 at 09:07:44PM +0000, Kyle McMartin wrote: > > > ARM64 currently doesn't fix up faults on the single-byte (strb) case of > > > __clear_user... which means that we can cause a nasty kernel panic as an > > > ordinary user with any multiple PAGE_SIZE+1 read from /dev/zero. > > > i.e.: dd if=/dev/zero of=foo ibs=1 count=1 (or ibs=65537, etc.) > > > > Thanks for this, it's been like this for a while. Applied. > > > > Thanks Catalin, if it's not too late, I forgot to add a > Reported-by: Miloš Prchlík <mprchlik@...hat.com> > for the initial report of the panic. I'll add this, I haven't pushed it out yet. -- Catalin -- 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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