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SubjectRe: [PATCH 1/7] fs: introduce kernel_pread_file* support
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Hi Takashi

On 2019-08-23 5:29 a.m., Takashi Iwai wrote:
> On Thu, 22 Aug 2019 21:24:45 +0200,
> Scott Branden wrote:
>> Add kernel_pread_file* support to kernel to allow for partial read
>> of files with an offset into the file. Existing kernel_read_file
>> functions call new kernel_pread_file functions with offset=0 and
>> flags=KERNEL_PREAD_FLAG_WHOLE.
> Would this change passes the security check like ima?
> I thought security_kernel_post_read_file() checks the whole content
> for calculating the hash...

It passes the fw_run_tests.sh.  How do you test the firmware loader
passes this security check?


What exactly does this ima do?  How do you enable/disable using it?

Any reasonable device would check the integrity of the firmware image
being loaded to it.

And, if part of a security model, authenticate the image.

Whatever security check you are referring to is not needed by
request_firmware_into_buf when loading

a partial file into a buffer.


>
>
> thanks,
>
> Takashi

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