linux-kernel - Re: [PATCH] arm64: Fix kernel address detection of __is_lm

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Message-Id: <161175296410.16506.3810718723675940477.b4-ty@arm.com>
Date:   Wed, 27 Jan 2021 13:09:54 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     linux-kernel@...r.kernel.org,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-arm-kernel@...ts.infradead.org, kasan-dev@...glegroups.com
Cc:     Will Deacon <will@...nel.org>, stable@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] arm64: Fix kernel address detection of __is_lm_address()

On Tue, 26 Jan 2021 13:40:56 +0000, Vincenzo Frascino wrote:
> Currently, the __is_lm_address() check just masks out the top 12 bits
> of the address, but if they are 0, it still yields a true result.
> This has as a side effect that virt_addr_valid() returns true even for
> invalid virtual addresses (e.g. 0x0).
> 
> Fix the detection checking that it's actually a kernel address starting
> at PAGE_OFFSET.

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64: Fix kernel address detection of __is_lm_address()
      https://git.kernel.org/arm64/c/519ea6f1c82f

-- 
Catalin