From: Scott Branden <scott.branden@broadcom.com>
To: Mimi Zohar <zohar@linux.ibm.com>,
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-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org
Subject: Re: [PATCH v6 8/8] ima: add FIRMWARE_PARTIAL_READ support
Date: Fri, 5 Jun 2020 16:31:14 -0700 [thread overview]
Message-ID: <824407ae-8ab8-0fe3-bd72-270fce960ac5@broadcom.com> (raw)
In-Reply-To: <1591399166.4615.37.camel@linux.ibm.com>
Hi Mimi,
On 2020-06-05 4:19 p.m., Mimi Zohar wrote:
> Hi Scott,
>
> On Fri, 2020-06-05 at 15:59 -0700, Scott Branden wrote:
>> @@ -648,6 +667,9 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
>> enum ima_hooks func;
>> u32 secid;
>>
>> + if (!file && read_id == READING_FIRMWARE_PARTIAL_READ)
>> + return 0;
> The file should be measured on the pre security hook, not here on the
> post security hook. Here, whether "file" is defined or not, is
> irrelevant. The test should just check "read_id".
OK, will remove the !file from here.
>
> Have you tested measuring the firmware by booting a system with
> "ima_policy=tcb" specified on the boot command line and compared the
> measurement entry in the IMA measurement list with the file hash (eg.
> sha1sum, sha256sum)?
Yes, I enabled IMA in my kernel and added ima_policy=tsb to the boot
command line,
Here are the entries from
/sys/kernel/security/ima/ascii_runtime_measurements of the files I am
accessing.
Please let me know if I am doing anything incorrectly.
10 4612bce355b2dbc45ecd95e17001636be8832c7f ima-ng
sha1:fddd9a28c2b15acf3b0fc9ec0cf187cb2153d7f2
/lib/firmware/vk-boot1-bcm958401m2.ecdsa.bin
10 4c0eb0fc30eb7ac3a30a27f05c1d2a8d28d6a9ec ima-ng
sha1:b16d343dd63352d10309690c71b110762a9444c3
/lib/firmware/vk-boot2-bcm958401m2_a72.ecdsn
The sha1 sum matches:
root@genericx86-64:/sys/kernel/security/ima# sha1sum
/lib/firmware/vk-boot1-bcm958401m2.ecdsa.bin
fddd9a28c2b15acf3b0fc9ec0cf187cb2153d7f2
/lib/firmware/vk-boot1-bcm958401m2.ecdsa.bin
root@genericx86-64:/sys/kernel/security/ima# sha1sum
/lib/firmware/vk-boot2-bcm958401m2_a72.ecdsa.bin
b16d343dd63352d10309690c71b110762a9444c3
/lib/firmware/vk-boot2-bcm958401m2_a72.ecdsa.bin
>
> Mimi
>
>> +
>> if (!file && read_id == READING_FIRMWARE) {
>> if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
>> (ima_appraise & IMA_APPRAISE_ENFORCE)) {
next prev parent reply other threads:[~2020-06-05 23:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-05 22:59 [PATCH v6 0/8] firmware: add partial read support in request_firmware_into_buf Scott Branden
2020-06-05 22:59 ` [PATCH v6 1/8] fs: introduce kernel_pread_file* support Scott Branden
2020-06-06 3:20 ` Matthew Wilcox
2020-06-06 4:56 ` Scott Branden
2020-06-05 22:59 ` [PATCH v6 2/8] firmware: add offset to request_firmware_into_buf Scott Branden
2020-06-06 1:34 ` kernel test robot
2020-06-05 22:59 ` [PATCH v6 3/8] test_firmware: add partial read support for request_firmware_into_buf Scott Branden
2020-06-05 22:59 ` [PATCH v6 4/8] firmware: test partial file reads of request_firmware_into_buf Scott Branden
2020-06-05 22:59 ` [PATCH v6 5/8] bcm-vk: add bcm_vk UAPI Scott Branden
2020-06-05 22:59 ` [PATCH v6 6/8] misc: bcm-vk: add Broadcom VK driver Scott Branden
2020-06-05 22:59 ` [PATCH v6 7/8] MAINTAINERS: bcm-vk: add maintainer for Broadcom VK Driver Scott Branden
2020-06-05 22:59 ` [PATCH v6 8/8] ima: add FIRMWARE_PARTIAL_READ support Scott Branden
2020-06-05 23:19 ` Mimi Zohar
2020-06-05 23:31 ` Scott Branden [this message]
2020-06-05 23:48 ` Mimi Zohar
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