linux-kernel - Re: [PATCH v23 12/24] x86/sgx: Linux Enclave Driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20191031211252.GC10507@linux.intel.com>
Date:   Thu, 31 Oct 2019 23:12:52 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, nhorman@...hat.com, npmccallum@...hat.com,
        serge.ayoun@...el.com, shay.katz-zamir@...el.com,
        haitao.huang@...el.com, andriy.shevchenko@...ux.intel.com,
        tglx@...utronix.de, kai.svahn@...el.com, bp@...en8.de,
        josh@...htriplett.org, luto@...nel.org, kai.huang@...el.com,
        rientjes@...gle.com, cedric.xing@...el.com, puiterwijk@...hat.com,
        linux-security-module@...r.kernel.org,
        Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [PATCH v23 12/24] x86/sgx: Linux Enclave Driver

On Wed, Oct 30, 2019 at 02:30:45AM -0700, Sean Christopherson wrote:
> Why?  The number of pages processed is effectively returned via the params
> on any error, e.g. wouldn't it be more appropriate to return -ERESTARTSYS?
> And I don't see any reason to add an arbitrary cap on the number of pages,
> e.g. SGX plays nice with the scheduler and signals, and restricting the
> number of EPC pages available to a process via cgroups (returning -ENOMEM)
> is a better solution for managing EPC.

Returning -ENOMEM does not tell you from which page to retry.

/Jarkko