From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: linux-sgx@vger.kernel.org
Cc: x86@kernel.org, Sean Christopherson <sean.j.christopherson@intel.com>
Subject: Re: [PATCH] x86/sgx: Sanitize pages in two rounds
Date: Sun, 9 Feb 2020 23:04:26 +0200 [thread overview]
Message-ID: <20200209210426.GB3702@linux.intel.com> (raw)
In-Reply-To: <20200206161550.5920-1-jarkko.sakkinen@linux.intel.com>
On Thu, Feb 06, 2020 at 06:15:50PM +0200, Jarkko Sakkinen wrote:
> WARN_ONCE() can trigger after kexec() on systems with multiple EPC
> sections. This can happen when an enclave has a SECS page in some section
> and child pages in a section processed after the section containing the
> SECS page. CPU does not allow to remove SECS before all of its children
> have been removed.
>
> Fix this by removing the tail from sgx_sanitize_section() and iterate
> sections in two rounds by calling the resulting function.
>
> Finally, report to the user space only after all processing has been
> done and not in the middle of processing as before. This improves the
> quality of reporting as kernel can tell how many unsanitized pages in
> each section was left unprocessed.
>
> Cc: x86@kernel.org
> Reported-by: Sean Christopherson <sean.j.christopherson@intel.com>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Merged.
/Jarkko
prev parent reply other threads:[~2020-02-09 21:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-06 16:15 [PATCH] x86/sgx: Sanitize pages in two rounds Jarkko Sakkinen
2020-02-09 21:04 ` Jarkko Sakkinen [this message]
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