Re: [PATCH v5 1/7] fs: introduce kernel_pread_file* support

From: Scott Branden <scott.branden@broadcom.com>
To: Mimi Zohar <zohar@kernel.org>,
	Luis Chamberlain <mcgrof@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	David Brown <david.brown@linaro.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Shuah Khan <shuah@kernel.org>,
	bjorn.andersson@linaro.org,
	Shuah Khan <skhan@linuxfoundation.org>,
	Arnd Bergmann <arnd@arndb.de>
Cc: "Rafael J . Wysocki" <rafael@kernel.org>,
	linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-fsdevel@vger.kernel.org,
	BCM Kernel Feedback <bcm-kernel-feedback-list@broadcom.com>,
	Olof Johansson <olof@lixom.net>,
	Andrew Morton <akpm@linux-foundation.org>,
	Dan Carpenter <dan.carpenter@oracle.com>,
	Colin Ian King <colin.king@canonical.com>,
	Kees Cook <keescook@chromium.org>, Takashi Iwai <tiwai@suse.de>,
	linux-kselftest@vger.kernel.org, Andy Gross <agross@kernel.org>,
	linux-security-module <linux-security-module@vger.kernel.org>,
	linux-integrity <linux-integrity@vger.kernel.org>
Subject: Re: [PATCH v5 1/7] fs: introduce kernel_pread_file* support
Date: Wed, 13 May 2020 11:53:23 -0700	[thread overview]
Message-ID: <0e6b5f65-8c61-b02e-7d35-b4ae52aebcf3@broadcom.com> (raw)
In-Reply-To: <1589395153.5098.158.camel@kernel.org>

Hi Mimi,

On 2020-05-13 11:39 a.m., Mimi Zohar wrote:
> [Cc'ing linux-security-module, linux-integrity]
>
> On Thu, 2020-05-07 at 17:27 -0700, 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.
>>
>> Signed-off-by: Scott Branden <scott.branden@broadcom.com>
>> ---
> <snip>
>
>> @@ -941,14 +955,16 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size,
The checkpatch shows this as kernel_read_file when it is actually the 
new function kernel_pread_file.
Please see the call to kernel_pread_file from kernel_read_file in the 
complete patch rather this snippet.
>>   
>>   		if (bytes == 0)
>>   			break;
>> +
>> +		buf_pos += bytes;
>>   	}
>>   
>> -	if (pos != i_size) {
>> +	if (pos != read_end) {
>>   		ret = -EIO;
>>   		goto out_free;
>>   	}
>>   
>> -	ret = security_kernel_post_read_file(file, *buf, i_size, id);
>> +	ret = security_kernel_post_read_file(file, *buf, alloc_size, id);
>>   	if (!ret)
>>   		*size = pos;
> Prior to the patch set that introduced this security hook, firmware
> would be read twice, once for measuring/appraising the firmware and
> again reading the file contents into memory.  Partial reads will break
> both IMA's measuring the file and appraising the file signatures.
The partial file read support is needed for request_firmware_into_buf 
from drivers.  The EXPORT_SYMBOL_GPL is being removed so that
there can be no abuse of the partial file read support.  Such file 
integrity checks are not needed for this use case.  The partial file 
(firmware image) is actually downloaded in portions and verified on the 
device it is loaded to.

Regards,
  Scott