linux-hardening - Re: [PATCH v5 09/17] pstore/ram: Use dynamic ramoops reserve resource

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Message-ID: <35c9d1b1-0f48-b873-d703-c880f3b91422@quicinc.com>
Date:   Mon, 11 Sep 2023 16:21:44 +0530
From:   Mukesh Ojha <quic_mojha@...cinc.com>
To:     Pavan Kondeti <quic_pkondeti@...cinc.com>
CC:     <corbet@....net>, <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
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Subject: Re: [PATCH v5 09/17] pstore/ram: Use dynamic ramoops reserve resource



On 9/11/2023 11:03 AM, Pavan Kondeti wrote:
> On Sun, Sep 10, 2023 at 01:46:10AM +0530, Mukesh Ojha wrote:
>> As dynamic ramoops command line parsing is now added, so
>> lets add the support in ramoops driver to get the resource
>> structure and add it during platform device registration.
>>
>> Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
>> ---
>>   fs/pstore/ram.c | 10 +++++++---
>>   1 file changed, 7 insertions(+), 3 deletions(-)
>>
> 
> Documentation/admin-guide/ramoops.rst might need an update as well.

I have said in the cover-letter under changes in v5, it is open for
comment and not yet documented it yet.

> 
>> diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
>> index 2f625e1fa8d8..e73fbbc1b5b5 100644
>> --- a/fs/pstore/ram.c
>> +++ b/fs/pstore/ram.c
>> @@ -913,13 +913,17 @@ static void __init ramoops_register_dummy(void)
>>   
>>   	/*
>>   	 * Prepare a dummy platform data structure to carry the module
>> -	 * parameters. If mem_size isn't set, then there are no module
>> -	 * parameters, and we can skip this.
>> +	 * parameters. If mem_size isn't set, check for dynamic ramoops
>> +	 * size and extract the information if it is set.
>>   	 */
>> -	if (!mem_size)
>> +	if (!mem_size && !dyn_ramoops_res.end)
>>   		return;
>>   
>>   	pr_info("using module parameters\n");
>> +	if (dyn_ramoops_res.end) {
>> +		mem_size = resource_size(&dyn_ramoops_res);
>> +		mem_address = dyn_ramoops_res.start;
>> +	}
>>   
>>   	memset(&pdata, 0, sizeof(pdata));
>>   	pdata.mem_size = mem_size;
> 
> You might want to add "arch_" prefix to dyn_ramoops resource so that it
> would be clear that it is coming from arch code. This code needs to
> guard against arch not supplying this.

Sure, thanks for pointing this.
Agree, if we finally decide to keep it in arch/arm64 .

-Mukesh
> 
> Thanks,
> Pavan