From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
linux-sgx@vger.kernel.org, akpm@linux-foundation.org,
dave.hansen@intel.com, nhorman@redhat.com, npmccallum@redhat.com,
haitao.huang@intel.com, andriy.shevchenko@linux.intel.com,
tglx@linutronix.de, kai.svahn@intel.com, bp@alien8.de,
josh@joshtriplett.org, luto@kernel.org, kai.huang@intel.com,
rientjes@google.com, cedric.xing@intel.com,
puiterwijk@redhat.com, linux-security-module@vger.kernel.org,
Suresh Siddha <suresh.b.siddha@intel.com>,
Jethro Beekman <jethro@fortanix.com>,
Haitao Huang <haitao.huang@linux.intel.com>,
Chunyang Hui <sanqian.hcy@antfin.com>,
Jordan Hand <jorhand@linux.microsoft.com>,
Seth Moore <sethmo@google.com>
Subject: Re: [PATCH v30 10/20] x86/sgx: Linux Enclave Driver
Date: Fri, 22 May 2020 22:26:09 +0300 [thread overview]
Message-ID: <20200522192609.GE10319@linux.intel.com> (raw)
In-Reply-To: <20200521191236.GA23043@linux.intel.com>
On Thu, May 21, 2020 at 12:12:36PM -0700, Sean Christopherson wrote:
> On Fri, May 15, 2020 at 03:44:00AM +0300, Jarkko Sakkinen wrote:
> > +long sgx_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
> > +{
> > + struct sgx_encl *encl = filep->private_data;
> > + int ret, encl_flags;
> > +
> > + encl_flags = atomic_fetch_or(SGX_ENCL_IOCTL, &encl->flags);
> > + if (encl_flags & SGX_ENCL_IOCTL)
> > + return -EBUSY;
> > +
> > + if (encl_flags & SGX_ENCL_DEAD)
> > + return -EFAULT;
>
> Returning immediately is wrong as it leaves SGX_ENCL_IOCTL set. This results
> in the application seeing -EBUSY on future ioctls() instead of -EFAULT. Can be
> fixed as below. Do you want me to send a formal patch on linux-sgx?
I just rewrote the same thing.
/Jarkko
next prev parent reply other threads:[~2020-05-22 19:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200515004410.723949-1-jarkko.sakkinen@linux.intel.com>
2020-05-15 0:44 ` [PATCH v30 10/20] x86/sgx: Linux Enclave Driver Jarkko Sakkinen
2020-05-21 19:12 ` Sean Christopherson
2020-05-22 19:26 ` Jarkko Sakkinen [this message]
2020-05-22 19:39 ` Jarkko Sakkinen
2020-05-22 3:33 ` Sean Christopherson
2020-05-15 0:44 ` [PATCH v30 11/20] x86/sgx: Add provisioning Jarkko Sakkinen
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