linux-kernel - Re: [PATCH RFC] x86/sgx: Simplify struct sgx_enclave_restrict

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Message-ID: <13a43c8d9e9d103009e652e7e8ff49e6844316d5.camel@kernel.org>
Date:   Tue, 05 Apr 2022 21:30:10 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Reinette Chatre <reinette.chatre@...el.com>,
        linux-sgx@...r.kernel.rog
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Nathaniel McCallum <nathaniel@...fian.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "open list:INTEL SGX" <linux-sgx@...r.kernel.org>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] x86/sgx: Simplify struct
 sgx_enclave_restrict_permissions

On Tue, 2022-04-05 at 10:21 -0700, Reinette Chatre wrote:
> Hi Jarkko,
> 
> On 4/5/2022 8:16 AM, Jarkko Sakkinen wrote:
> > The reasoning to change SECINFO to simply flags is stated in this inline
> > comment:
> > 
> > /*
> >  * Return valid permission fields from a secinfo structure provided by
> >  * user space. The secinfo structure is required to only have bits in
> >  * the permission fields set.
> >  */
> > 
> > It is better to simply change the parameter type than require to use
> > a malformed version of a data structure.
> 
> Could you please elaborate what is malformed?

The structure that is accepted by the API. According to SDM permission
changes are done with a structure where PT_REG is set, which gives
-EINVAL. I categorize it as a bug.

BR, Jarkko