linux-hardening - Re: [PATCH v3 07/18] arm64: defconfig: Enable Qualcomm minidump driver

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Date:   Thu, 4 May 2023 20:13:34 +0530
From:   Mukesh Ojha <quic_mojha@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <corbet@....net>,
        <keescook@...omium.org>, <tony.luck@...el.com>,
        <gpiccoli@...lia.com>, <catalin.marinas@....com>,
        <will@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <robh+dt@...nel.org>, <linus.walleij@...aro.org>,
        <linux-gpio@...r.kernel.org>, <srinivas.kandagatla@...aro.org>
CC:     <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-hardening@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v3 07/18] arm64: defconfig: Enable Qualcomm minidump
 driver



On 5/4/2023 6:02 PM, Krzysztof Kozlowski wrote:
> On 04/05/2023 13:45, Mukesh Ojha wrote:
>>
>>
>> On 5/4/2023 4:53 PM, Krzysztof Kozlowski wrote:
>>> On 03/05/2023 19:02, Mukesh Ojha wrote:
>>>> Previous patches add the Qualcomm minidump driver support, so
>>>> lets enable minidump config so that it can be used by kernel
>>>> clients.
>>>>
>>>> Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
>>>
>>> This patchset is split too much. Defconfig change is one change. Not two
>>> or three.
>>>
>>>> ---
>>>>    arch/arm64/configs/defconfig | 1 +
>>>>    1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
>>>> index a24609e..831c942 100644
>>>> --- a/arch/arm64/configs/defconfig
>>>> +++ b/arch/arm64/configs/defconfig
>>>> @@ -1250,6 +1250,7 @@ CONFIG_QCOM_STATS=m
>>>>    CONFIG_QCOM_WCNSS_CTRL=m
>>>>    CONFIG_QCOM_APR=m
>>>>    CONFIG_QCOM_ICC_BWMON=m
>>>> +CONFIG_QCOM_MINIDUMP=y
>>>
>>> This must be a module.
>>
>> Why do you think this should be a module ?
>>
>> Is it because, it is lying here among others '=m' ?
> 
> Because we want and insist on everything being a module. That's the
> generic rule. There are exceptions, so if this justifies being an
> exception, please bring appropriate arguments.
> 
>>
>> Or you have some other reasoning ? like it is for qcom specific
>> soc and can not be used outside ? but that is not true for
>> all configs mentioned here.
>>
>> The reason behind making it as '=y' was, to collect information from
>> core kernel data structure as well as the information like percpu data,
>> run queue, irq stat kind of information on kernel crash on a target
>> running some perf configuration(android phone).
> 
> I don't understand why =m stops you from all that.

How do i get kernel symbol address from a modules
can we use kallsyms_lookup_name from modules ?

--Mukesh

  What's more, I don't
> understand why do you refer to the Android here. This is a development
> and debugging Linux defconfig, not Android reference config for vendors...
> 
> Best regards,
> Krzysztof
>