linux-kernel - Re: [PATCH 2/2] ima: Free IMA measurement buffer after kexec syscall

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Date:   Wed, 3 Feb 2021 09:46:40 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     Thiago Jung Bauermann <bauerman@...ux.ibm.com>
Cc:     zohar@...ux.ibm.com, dmitry.kasatkin@...il.com,
        ebiederm@...ssion.com, gregkh@...uxfoundation.org,
        sashal@...nel.org, tyhicks@...ux.microsoft.com,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 2/2] ima: Free IMA measurement buffer after kexec syscall

On 1/22/21 2:31 PM, Thiago Jung Bauermann wrote:
> 
> Lakshmi Ramasubramanian <nramas@...ux.microsoft.com> writes:
> 
>> IMA allocates kernel virtual memory to carry forward the measurement
>> list, from the current kernel to the next kernel on kexec system call,
>> in ima_add_kexec_buffer() function.  This buffer is not freed before
>> completing the kexec system call resulting in memory leak.
>>
>> Add ima_buffer field in "struct kimage" to store the virtual address
>> of the buffer allocated for the IMA measurement list.
>> Free the memory allocated for the IMA measurement list in
>> kimage_file_post_load_cleanup() function.
>>
>> Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
>> Suggested-by: Tyler Hicks <tyhicks@...ux.microsoft.com>
>> Fixes: 7b8589cc29e7 ("ima: on soft reboot, save the measurement list")
> 
> Good catch.
> 
> Reviewed-by: Thiago Jung Bauermann <bauerman@...ux.ibm.com>
> 

Thanks Thiago.

  -lakshmi