linux-kernel - RE: [RFC PATCH 8/9] LSM: x86/sgx: Introduce ->enclave

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Date:   Mon, 3 Jun 2019 06:28:04 +0000
From:   "Xing, Cedric" <cedric.xing@...el.com>
To:     "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        "Jarkko Sakkinen" <jarkko.sakkinen@...ux.intel.com>
CC:     Andy Lutomirski <luto@...nel.org>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        LSM List <linux-security-module@...r.kernel.org>,
        Paul Moore <paul@...l-moore.com>,
        Eric Paris <eparis@...isplace.org>,
        "selinux@...r.kernel.org" <selinux@...r.kernel.org>,
        Jethro Beekman <jethro@...tanix.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "npmccallum@...hat.com" <npmccallum@...hat.com>,
        "Ayoun, Serge" <serge.ayoun@...el.com>,
        "Katz-zamir, Shay" <shay.katz-zamir@...el.com>,
        "Huang, Haitao" <haitao.huang@...el.com>,
        "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
        "Svahn, Kai" <kai.svahn@...el.com>, Borislav Petkov <bp@...en8.de>,
        Josh Triplett <josh@...htriplett.org>,
        "Huang, Kai" <kai.huang@...el.com>,
        David Rientjes <rientjes@...gle.com>,
        "Roberts, William C" <william.c.roberts@...el.com>,
        "Tricca, Philip B" <philip.b.tricca@...el.com>
Subject: RE: [RFC PATCH 8/9] LSM: x86/sgx: Introduce ->enclave_load() hook
 for Intel SGX

> From: Christopherson, Sean J
> Sent: Friday, May 31, 2019 4:32 PM
> 
> diff --git a/include/linux/security.h b/include/linux/security.h index
> 659071c2e57c..2f7925eeef7e 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -392,6 +392,8 @@ void security_inode_invalidate_secctx(struct inode *inode);  int
> security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen);  int
> security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen);  int
> security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen);
> +int security_enclave_load(struct vm_area_struct *vma, unsigned long prot,
> +			  unsigned long *allowed_prot);

Per my comments to the cover letter, security_enclave_load() should have a signature similar to the following:

int security_enclave_load(struct file *enclave_fd, unsigned long linear_address, unsigned long nr_pages, int prot, struct vm_area_struct *source_vma);

@enclave_fd identifies the enclave to which new pages are being added.
@linear_address/@...pages specifies the linear range of pages being added.
@prot specifies the initial protection of those newly added pages. It is taken from the vma covering the target range.
@source_vma covers the source pages in the case of EADD. An LSM is expected to make sure security_file_mprotect(source_vma, prot, prot) would succeed before checking anything else, unless @source_vma is NULL, indicating pages are being EAUG'ed. In all cases, LSM is expected to "remember" @prot for all those pages to be checked in future security_file_mprotect() invocations.

>  #else /* CONFIG_SECURITY */