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security: introduce kernel_module_from_file hook

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Now that kernel module origins can be reasoned about, provide a hook to
the LSMs to make policy decisions about the module file. This will let
Chrome OS enforce that loadable kernel modules can only come from its
read-only hash-verified root filesystem. Other LSMs can, for example,
read extended attributes for signatures, etc.

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Acked-by: Eric Paris <eparis@redhat.com>
Acked-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Kees Cook
2012-10-16 07:32:07 +10:30
committed by Rusty Russell
parent 2f3238aebe
commit 2e72d51b4a
4 changed files with 35 additions and 0 deletions
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6
security/capability.c
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@@ -395,6 +395,11 @@ static int cap_kernel_module_request(char *kmod_name)
return 0;
}
static int cap_kernel_module_from_file(struct file *file)
{
return 0;
}
static int cap_task_setpgid(struct task_struct *p, pid_t pgid)
{
return 0;
@@ -967,6 +972,7 @@ void __init security_fixup_ops(struct security_operations *ops)
set_to_cap_if_null(ops, kernel_act_as);
set_to_cap_if_null(ops, kernel_create_files_as);
set_to_cap_if_null(ops, kernel_module_request);
set_to_cap_if_null(ops, kernel_module_from_file);
set_to_cap_if_null(ops, task_fix_setuid);
set_to_cap_if_null(ops, task_setpgid);
set_to_cap_if_null(ops, task_getpgid);