From: Andrew Morton <akpm@linux-foundation.org>
To: Laura Abbott <labbott@redhat.com>
Cc: Dave Anderson <anderson@redhat.com>,
Kees Cook <keescook@chromium.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-arm-kernel@lists.infradead.org,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Ingo Molnar <mingo@kernel.org>, Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH] proc/kcore: Don't bounds check against address 0
Date: Tue, 1 May 2018 14:46:04 -0700 [thread overview]
Message-ID: <20180501144604.1cf872e7938bffc01a26349f@linux-foundation.org> (raw)
In-Reply-To: <20180501201143.15121-1-labbott@redhat.com>
On Tue, 1 May 2018 13:11:43 -0700 Laura Abbott <labbott@redhat.com> wrote:
> The existing kcore code checks for bad addresses against
> __va(0) with the assumption that this is the lowest address
> on the system. This may not hold true on some systems (e.g.
> arm64) and produce overflows and crashes. Switch to using
> other functions to validate the address range.
>
> Tested-by: Dave Anderson <anderson@redhat.com>
> Signed-off-by: Laura Abbott <labbott@redhat.com>
> ---
> I took your previous comments as a tested by, please let me know if that
> was wrong. This should probably just go through -mm. I don't think this
> is necessary for stable but I can request it later if necessary.
I'm surprised. "overflows and crashes" sounds rather serious??
next prev parent reply other threads:[~2018-05-01 21:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1039518799.26129578.1525185916272.JavaMail.zimbra@redhat.com>
2018-05-01 20:11 ` [PATCH] proc/kcore: Don't bounds check against address 0 Laura Abbott
2018-05-01 21:46 ` Andrew Morton [this message]
2018-05-01 22:26 ` Laura Abbott
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