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Date: Thu, 06 Aug 2020 20:23:51 -0400 From: Mimi Zohar <zohar@...ux.ibm.com> To: Kees Cook <keescook@...omium.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Scott Branden <scott.branden@...adcom.com>, Luis Chamberlain <mcgrof@...nel.org>, Takashi Iwai <tiwai@...e.de>, Jessica Yu <jeyu@...nel.org>, SeongJae Park <sjpark@...zon.de>, KP Singh <kpsingh@...omium.org>, linux-efi@...r.kernel.org, linux-security-module@...r.kernel.org, linux-integrity@...r.kernel.org, selinux@...r.kernel.org, linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v4 12/17] LSM: Add "contents" flag to kernel_read_file hook 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@...omium.org> Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>
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