linux-kernel - Re: [PATCH v2] rpadlpar: fix potential drc

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Message-Id: <161598380341.805135.1994223786629407257.b4-ty@ellerman.id.au>
Date:   Wed, 17 Mar 2021 23:23:23 +1100
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Tyrel Datwyler <tyreld@...ux.ibm.com>, bhelgaas@...gle.com
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] rpadlpar: fix potential drc_name corruption in store functions

On Mon, 15 Mar 2021 15:48:21 -0600, Tyrel Datwyler wrote:
> Both add_slot_store() and remove_slot_store() try to fix up the drc_name
> copied from the store buffer by placing a NULL terminator at nbyte + 1
> or in place of a '\n' if present. However, the static buffer that we
> copy the drc_name data into is not zeored and can contain anything past
> the n-th byte. This is problematic if a '\n' byte appears in that buffer
> after nbytes and the string copied into the store buffer was not NULL
> terminated to start with as the strchr() search for a '\n' byte will mark
> this incorrectly as the end of the drc_name string resulting in a drc_name
> string that contains garbage data after the n-th byte. The following
> debugging shows an example of the drmgr utility writing "PHB 4543" to
> the add_slot sysfs attribute, but add_slot_store logging a corrupted
> string value.
> 
> [...]

Applied to powerpc/fixes.

[1/1] rpadlpar: fix potential drc_name corruption in store functions
      https://git.kernel.org/powerpc/c/cc7a0bb058b85ea03db87169c60c7cfdd5d34678

cheers