• Mimi Zohar's avatar
    module: replace copy_module_from_fd with kernel version · a1db7420
    Mimi Zohar authored
    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: default avatarMimi Zohar <zohar@linux.vnet.ibm.com>
    Acked-by: default avatarKees Cook <keescook@chromium.org>
    Acked-by: default avatarLuis R. Rodriguez <mcgrof@kernel.org>
    Cc: Rusty Russell <rusty@rustcorp.com.au>
    a1db7420
security.c 53.4 KB