From: Will Deacon <will.deacon@arm.com>
To: "kassey@126.com" <kassey@126.com>
Cc: "mark.rutland" <mark.rutland@arm.com>,
"ard.biesheuvel" <ard.biesheuvel@linaro.org>,
"catalin.marinas" <catalin.marinas@arm.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
willy <willy@infradead.org>,
"kassey1216@gmail.com" <kassey1216@gmail.com>,
"robin.murphy" <robin.murphy@arm.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: Re: arm64: copy_from_user access the last page of ddr has problem on 4.14 kernel
Date: Mon, 11 Feb 2019 11:34:46 +0000 [thread overview]
Message-ID: <20190211113446.GB32385@fuggles.cambridge.arm.com> (raw)
In-Reply-To: <201902011746430858184@126.com>
On Fri, Feb 01, 2019 at 05:46:44PM +0800, kassey@126.com wrote:
> sorry for late response.
> we did have process in userspace doing mmap.
> mult device can reprocued this issue, so we do not suspect the ddr
> not stable.
Multiple devices of the same SoC?
> can you help review below patch to against with such issue, because
> we find if enable kasan , issue not seen.
Unfortunately, I'm not sure what more we can do with this unless we have a
reliable way to reproduce the problem. What is the output that you're
expecting to see in the page? You said that you're seeing the problem in
sel_write_load(), but afaict that /is/ dealing with binary policy data for
SELinux, which may well look like the corruption you describe.
Did you run memtest as I suggested?
Will
> The corruption you have is reasonably regular:
>
> > 0079c00 6d6d 7061 0000 0000 0848 fd8f 0001 0000
> > 0079c10 0048 fd8f 0001 0000 0001 0000 0003 0000
> > 0079c20 2000 fd83 0001 0000 1fff fd86 0001 0000
> > 0079c30 0000 0000 0000 0000 700f 0000 0000 0000
>
> Here's "mmap" again, but the record is twice as long:
>
> > 0079c40 6d6d 7061 0000 0000 f448 ffff 0001 0000
> > 0079c50 f748 ffff 0001 0000 0001 0000 0004 0000
> > 0079c60 3000 fd8c 0001 0000 2fff fd8e 0001 0000
> > 0079c70 0000 0000 0000 0000 700f 0000 0000 0000
> > 0079c80 c103 0606 0100 be00 1009 3b00 3b07 0607
> > 0079c90 0100 5700 1006 e800 8c03 3103 0100 0a00
> > 0079ca0 0000 cf00 bf08 0a00 0100 5700 1006 3700
> > 0079cb0 3906 0606 0100 1600 0004 4700 9902 0207
>
> And then the whole structure repeats:
>
> > 0079cc0 6d6d 7061 0000 0000 f808 ffff 0001 0000
> > 0079cd0 f1c8 ffff 0001 0000 0001 0000 0005 0000
> > 0079ce0 d000 fff8 0001 0000 efff fffa 0001 0000
> > 0079cf0 0000 0000 0000 0000 700f 0000 0000 0000
>
> > 0079d00 6d6d 7061 0000 0000 f1c8 ffff 0001 0000
> > 0079d10 f388 ffff 0001 0000 0001 0000 0003 0000
> > 0079d20 c000 ffdf 0001 0000 6fff fff8 0001 0000
> > 0079d30 0000 0000 0000 0000 700f 0000 0000 0000
> > 0079d40 9407 0901 0100 5300 0204 b400 d503 0a04
> > 0079d50 0100 0000 0001 0200 7309 0202 0100 0200
> > 0079d60 5000 0200 7309 0202 0400 ff00 f7ff 94ff
> > 0079d70 b400 0208 0100 dc00 0000 b400 5803 0607
> > 0079d80 6d6d 7061 0000 0000 f7c8 ffff 0001 0000
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prev parent reply other threads:[~2019-02-11 11:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAKwPUowmzZ2BNi-RmJm3=ENrZ5sxPf1SeT+b9A9iHHSCUQQAUw@mail.gmail.com>
2019-01-16 16:48 ` arm64: copy_from_user access the last page of ddr has problem on 4.14 kernel Will Deacon
2019-01-17 1:57 ` Kassey
2019-01-20 2:08 ` Will Deacon
2019-02-01 9:46 ` kassey
2019-02-11 11:34 ` Will Deacon [this message]
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