linux-kernel - Re: [PATCH v3] module: Fix display of wrong module .text address

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Message-Id: <72461e74-2229-bf33-cbce-9a016bef4df9@linux.ibm.com>
Date:   Wed, 18 Apr 2018 09:22:31 +0200
From:   Thomas-Mich Richter <tmricht@...ux.ibm.com>
To:     "Tobin C. Harding" <me@...in.cc>
Cc:     jeyu@...nel.org, torvalds@...ux-foundation.org,
        linux-kernel@...r.kernel.org, borntraeger@...ibm.com,
        schwidefsky@...ibm.com, brueckner@...ux.vnet.ibm.com,
        heiko.carstens@...ibm.com, peterz@...radead.org, acme@...nel.org,
        keescook@...omium.org, stable@...r.kernel.org
Subject: Re: [PATCH v3] module: Fix display of wrong module .text address

On 04/18/2018 09:17 AM, Tobin C. Harding wrote:
> On Wed, Apr 18, 2018 at 09:14:36AM +0200, Thomas Richter wrote:
>> Reading file /proc/modules shows the correct address:
>> [root@...lp76 ~]# cat /proc/modules | egrep '^qeth_l2'
>> qeth_l2 94208 1 - Live 0x000003ff80401000
>>
>> and reading file /sys/module/qeth_l2/sections/.text
>> [root@...lp76 ~]# cat /sys/module/qeth_l2/sections/.text
>> 0x0000000018ea8363
>> displays a random address.
>>
>> This breaks the perf tool which uses this address on s390
>> to calculate start of .text section in memory.
>>
>> Fix this by printing the correct (unhashed) address.
>>
>> Thanks to Jessica Yu for helping on this.
>>
>> Fixes: ef0010a30935 ("vsprintf: don't use 'restricted_pointer()' when not restricting")
>> Cc: <stable@...r.kernel.org> # v4.15+
>> Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
>> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
>> Cc: Jessica Yu <jeyu@...nel.org>
>> ---
> 
> What's changed in each version please?
> 
> 
> thanks,
> Tobin.
> 

V2: Changed sprintf format string from %#lx to 0x%px (suggested by Kees Cook).
V3: Changed sprintf agrument from 0 to NULL to avoid sparse warning.

-- 
Thomas Richter, Dept 3303, IBM LTC Boeblingen Germany
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