linux-kernel - Re: [PATCH 14 of 33] IB/ipath - fix port sharing on powerpc

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:	Tue, 10 Apr 2007 15:32:19 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	"Bryan O'Sullivan" <bos@...hscale.com>
Cc:	general@...ts.openfabrics.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14 of 33] IB/ipath - fix port sharing on powerpc

I applied this, but I still think there's some more work to do in this
area:

 > The port sharing feature mixed kernel virtual addresses as well as
 > physical addresses for the offset used to describe the mmap address to map
 > the InfiniPath hardware into user space.  This had a conflict on powerpc.
 > The new scheme converts it to a physical address so it doesn't conflict
 > with chip addresses and yet still fits in 40/44 bits so it isn't truncated
 > by 32-bit applications calling mmap64().

there's no guarantee that a physical address fits in 40 or 44 or 63
bits on a 64 bit platform.  So you've fixed this problem on the
platforms you test for now, but it could easily crop up again...
-
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/