From: Vinod Koul <vkoul@kernel.org>
To: Fuqian Huang <huangfq.daxian@gmail.com>
Cc: linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org,
linux-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org
Subject: Re: Potential info leak: Kernel pointer leak?
Date: Wed, 23 Jan 2019 17:54:29 +0530 [thread overview]
Message-ID: <20190123122429.GO4635@vkoul-mobl> (raw)
In-Reply-To: <CABXRUiRP8fHvGkO3T9AOFV=prVUACiCm2frbAEnG2v6UhrTw0A@mail.gmail.com>
On 22-01-19, 21:25, Fuqian Huang wrote:
> Hi, recently I came across some code and it seems to be able to leak
> kernel address?
> Is the following code cause info leak in the Linux kernel?
> The callback function address is printed to debugfs.
> The local user could know the kernel object address, and is able to
> bypass kASLR.
> linux-4.14.90
> drivers/dma/qcom/hidma_dbg.c:46
> function - hidma_ll_chstats
Doesnt %p not print kernel addresses anymore, see
Documentation/core-api/printk-formats.rst
>
> The hidma_ll_chstats function in drivers/dma/qcom/hidma_dbg.c in the
> Linux kernel 4.14.90 allows local users to obtain sensitive address
> information by reading "callback=" lines in a debugfs file.
>
> Similar to CVE-2018-7754
--
~Vinod
next prev parent reply other threads:[~2019-01-23 12:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-22 13:25 Fuqian Huang
2019-01-23 12:24 ` Vinod Koul [this message]
2019-01-23 15:01 ` Marc Gonzalez
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