linux-kernel - Re: [PATCH 7/7] CXL: Unmap MMIO regions when detaching a context

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]

Date:	Mon, 15 Dec 2014 14:32:18 +1100
From:	Ian Munsie <imunsie@....ibm.com>
To:	mpe <mpe@...erman.id.au>
Cc:	benh <benh@...nel.crashing.org>, mikey <mikey@...ling.org>,
	anton <anton@...ba.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linuxppc-dev <linuxppc-dev@...abs.org>, jk <jk@...abs.org>,
	cbe-oss-dev <cbe-oss-dev@...ts.ozlabs.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Philippe Bergheaud <philippe.bergheaud@...ibm.com>
Subject: Re: [PATCH 7/7] CXL: Unmap MMIO regions when detaching a context

Excerpts from Ian Munsie's message of 2014-12-08 19:18:01 +1100:
> From: Ian Munsie <imunsie@....ibm.com>
> 
> If we need to force detach a context (e.g. due to EEH or simply force
> unbinding the driver) we should prevent the userspace contexts from
> being able to access the Problem State Area MMIO region further, which
> they may have mapped with mmap().
> 
> This patch unmaps any mapped MMIO regions when detaching a userspace
> context.

Might want to drop this one for now - Philippe found that it sometimes
causes an issue when multiple contexts are using the afu. Seems that
unmap_mapping_range() unmapped a bit more than I expected.

Cheers,
-Ian

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/