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.