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From: Mimi Zohar <zohar@linux.ibm.com>
To: Kees Cook <keescook@chromium.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Scott Branden <scott.branden@broadcom.com>,
	Luis Chamberlain <mcgrof@kernel.org>,
	Takashi Iwai <tiwai@suse.de>, Jessica Yu <jeyu@kernel.org>,
	SeongJae Park <sjpark@amazon.de>, KP Singh <kpsingh@chromium.org>,
	linux-efi@vger.kernel.org, linux-security-module@vger.kernel.org,
	linux-integrity@vger.kernel.org, selinux@vger.kernel.org,
	linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 12/17] LSM: Add "contents" flag to kernel_read_file hook
Date: Thu, 06 Aug 2020 20:23:51 -0400
Message-ID: <1cdddf80e0b1ea46346edf8a1c0dc81aea095f15.camel@linux.ibm.com> (raw)
In-Reply-To: <20200729175845.1745471-13-keescook@chromium.org>

On Wed, 2020-07-29 at 10:58 -0700, Kees Cook wrote:
> As with the kernel_load_data LSM hook, add a "contents" flag to the
> kernel_read_file LSM hook that indicates whether the LSM can expect
> a matching call to the kernel_post_read_file LSM hook with the full
> contents of the file. With the coming addition of partial file read
> support for kernel_read_file*() API, the LSM will no longer be able
> to always see the entire contents of a file during the read calls.
> 
> For cases where the LSM must read examine the complete file contents,
> it will need to do so on its own every time the kernel_read_file
> hook is called with contents=false (or reject such cases). Adjust all
> existing LSMs to retain existing behavior.
> 
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>


  reply index

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-29 17:58 [PATCH v4 00/17] Introduce partial kernel_read_file() support Kees Cook
2020-07-29 17:58 ` [PATCH v4 01/17] test_firmware: Test platform fw loading on non-EFI systems Kees Cook
2020-07-29 17:58 ` [PATCH v4 02/17] fs/kernel_read_file: Remove FIRMWARE_PREALLOC_BUFFER enum Kees Cook
2020-07-29 17:58 ` [PATCH v4 03/17] fs/kernel_read_file: Remove FIRMWARE_EFI_EMBEDDED enum Kees Cook
2020-07-29 17:58 ` [PATCH v4 04/17] fs/kernel_read_file: Split into separate include file Kees Cook
2020-07-30  2:22   ` James Morris
2020-07-29 17:58 ` [PATCH v4 05/17] fs/kernel_read_file: Split into separate source file Kees Cook
2020-07-29 17:58 ` [PATCH v4 06/17] fs/kernel_read_file: Remove redundant size argument Kees Cook
2020-07-30  2:25   ` James Morris
2020-07-29 17:58 ` [PATCH v4 07/17] fs/kernel_read_file: Switch buffer size arg to size_t Kees Cook
2020-07-30  2:25   ` James Morris
2020-07-29 17:58 ` [PATCH v4 08/17] fs/kernel_read_file: Add file_size output argument Kees Cook
2020-07-30  2:26   ` James Morris
2020-07-29 17:58 ` [PATCH v4 09/17] LSM: Introduce kernel_post_load_data() hook Kees Cook
2020-08-06 21:59   ` Mimi Zohar
2020-08-07  0:21   ` KP Singh
2020-07-29 17:58 ` [PATCH v4 10/17] firmware_loader: Use security_post_load_data() Kees Cook
2020-08-06 22:07   ` Mimi Zohar
2020-07-29 17:58 ` [PATCH v4 11/17] module: Call security_kernel_post_load_data() Kees Cook
2020-08-05 14:53   ` Jessica Yu
2020-08-07  0:22     ` KP Singh
2020-07-29 17:58 ` [PATCH v4 12/17] LSM: Add "contents" flag to kernel_read_file hook Kees Cook
2020-08-07  0:23   ` Mimi Zohar [this message]
2020-07-29 17:58 ` [PATCH v4 13/17] IMA: Add support for file reads without contents Kees Cook
2020-07-29 17:58 ` [PATCH v4 14/17] fs/kernel_file_read: Add "offset" arg for partial reads Kees Cook
2020-07-29 17:58 ` [PATCH v4 15/17] firmware: Store opt_flags in fw_priv Kees Cook
2020-07-29 17:58 ` [PATCH v4 16/17] firmware: Add request_partial_firmware_into_buf() Kees Cook
2020-07-29 17:58 ` [PATCH v4 17/17] test_firmware: Test partial read support Kees Cook

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