From: Mimi Zohar <zohar@kernel.org>
To: Scott Branden <scott.branden@broadcom.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-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 14:39:13 -0400 [thread overview]
Message-ID: <1589395153.5098.158.camel@kernel.org> (raw)
In-Reply-To: <20200508002739.19360-2-scott.branden@broadcom.com>
[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,
>
> 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.
Mimi
next prev parent reply other threads:[~2020-05-13 18:39 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 0:27 [PATCH v5 0/7] firmware: add partial read support in request_firmware_into_buf Scott Branden
2020-05-08 0:27 ` [PATCH v5 1/7] fs: introduce kernel_pread_file* support Scott Branden
2020-05-13 0:27 ` Luis Chamberlain
2020-05-13 6:23 ` Scott Branden
2020-05-13 6:51 ` Greg Kroah-Hartman
2020-05-13 8:16 ` Scott Branden
2020-05-13 18:39 ` Mimi Zohar [this message]
2020-05-13 18:53 ` Scott Branden
2020-05-13 18:57 ` Scott Branden
2020-05-13 19:03 ` Mimi Zohar
2020-05-13 19:18 ` Scott Branden
2020-05-13 19:39 ` Mimi Zohar
2020-05-13 19:41 ` Scott Branden
2020-05-13 21:20 ` Mimi Zohar
2020-05-13 21:28 ` Luis Chamberlain
2020-05-13 22:12 ` Mimi Zohar
2020-05-13 22:48 ` Scott Branden
2020-05-13 23:00 ` Mimi Zohar
2020-05-13 23:34 ` Kees Cook
2020-05-13 23:58 ` Mimi Zohar
2020-05-08 0:27 ` [PATCH v5 2/7] firmware: add offset to request_firmware_into_buf Scott Branden
2020-05-13 0:33 ` Luis Chamberlain
2020-05-13 18:35 ` Scott Branden
2020-05-15 20:44 ` Luis Chamberlain
2020-05-08 0:27 ` [PATCH v5 3/7] test_firmware: add partial read support for request_firmware_into_buf Scott Branden
2020-05-13 0:35 ` Luis Chamberlain
2020-05-08 0:27 ` [PATCH v5 4/7] firmware: test partial file reads of request_firmware_into_buf Scott Branden
2020-05-08 0:27 ` [PATCH v5 5/7] bcm-vk: add bcm_vk UAPI Scott Branden
2020-05-08 0:27 ` [PATCH v5 7/7] MAINTAINERS: bcm-vk: add maintainer for Broadcom VK Driver Scott Branden
[not found] ` <20200508002739.19360-7-scott.branden@broadcom.com>
2020-05-13 0:38 ` [PATCH v5 6/7] misc: bcm-vk: add Broadcom VK driver Luis Chamberlain
2020-05-13 6:31 ` Scott Branden
2020-05-13 6:50 ` Greg Kroah-Hartman
2020-05-13 12:30 ` Luis Chamberlain
2020-05-13 18:39 ` Scott Branden
2020-05-13 16:23 ` [PATCH v5 0/7] firmware: add partial read support in request_firmware_into_buf Mimi Zohar
2020-05-15 20:47 ` Luis Chamberlain
2020-05-15 23:28 ` Scott Branden
2020-05-16 1:05 ` Luis Chamberlain
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