[PATCH v3 16/22] module: replace copy_module_from_fd with kernel version

[Luis R. Rodriguez]

On Wed, Feb 03, 2016 at 02:06:24PM -0500, Mimi Zohar wrote:
> Replace copy_module_from_fd() with kernel_read_file_from_fd().
> 
> Although none of the upstreamed LSMs define a kernel_module_from_file
> hook, IMA is called, based on policy, to prevent unsigned kernel modules
> from being loaded by the original kernel module syscall and to
> measure/appraise signed kernel modules.
> 
> The security function security_kernel_module_from_file() was called prior
> to reading a kernel module.  Preventing unsigned kernel modules from being
> loaded by the original kernel module syscall remains on the pre-read
> kernel_read_file() security hook.  Instead of reading the kernel module
> twice, once for measuring/appraising and again for loading the kernel
> module, the signature validation is moved to the kernel_post_read_file()
> security hook.
> 
> This patch removes the security_kernel_module_from_file() hook and security
> call.
> 
> Signed-off-by: Mimi Zohar <zohar at linux.vnet.ibm.com>

Acked-by: Luis R. Rodriguez <mcgrof at kernel.org>

  Luis