From: Joe Perches <joe@perches.com>
To: Al Viro <viro@ZenIV.linux.org.uk>, David Miller <davem@davemloft.net>
Cc: ben@decadent.org.uk, luis.henriques@canonical.com,
avijitnsec@codeaurora.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: CVE-2014-9900 fix is not upstream
Date: Tue, 23 Aug 2016 13:34:05 -0700 [thread overview]
Message-ID: <1471984445.3746.129.camel@perches.com> (raw)
In-Reply-To: <20160823200941.GB2356@ZenIV.linux.org.uk>
On Tue, 2016-08-23 at 21:09 +0100, Al Viro wrote:
> On Tue, Aug 23, 2016 at 11:24:06AM -0700, David Miller wrote:
> > > On some versions and architectures. Can you guarantee that you will
> > > notice when an exception appears?
> > Again, show me the assembler output exhibiting the lack of
> > initialization, for this specific structure and situation.
> >
> > That's all that I'm asking.
> ... and then we can file a bug report against the sodding compiler. Note
> that
> struct ethtool_wolinfo {
> __u32 cmd;
> __u32 supported;
> __u32 wolopts;
> __u8 sopass[SOPASS_MAX]; // 6, actually
> };
> is not going to *have* padding. Not on anything even remotely sane.
> If array of 6 char as member of a struct requires 64bit alignment on some
> architecture, I would really like some of what the designers of that ABI
> must have been smoking.
try this on x86-64
$ pahole -C ethtool_wolinfo vmlinux
struct ethtool_wolinfo {
__u32 cmd; /* 0 4 */
__u32 supported; /* 4 4 */
__u32 wolopts; /* 8 4 */
__u8 sopass[6]; /* 12 6 */
/* size: 20, cachelines: 1, members: 4 */
/* padding: 2 */
/* last cacheline: 20 bytes */
};
next prev parent reply other threads:[~2016-08-23 20:36 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-23 13:41 CVE-2014-9900 fix is not upstream Luis Henriques
2016-08-23 13:41 ` net: Zeroing the structure ethtool_wolinfo in ethtool_get_wol() Luis Henriques
2016-08-23 14:06 ` Joe Perches
[not found] ` <CAOp4FwRxfE61azV78TZ7EKESQZzRU2Pfkc2GJ9j3MV7pr80qew@mail.gmail.com>
2016-08-23 15:40 ` Joe Perches
2016-08-23 14:21 ` Eric Dumazet
2016-08-23 15:05 ` Joe Perches
2016-08-23 15:36 ` Eric Dumazet
2016-08-23 16:38 ` Andrey Ryabinin
2016-08-23 16:46 ` Edward Cree
2016-08-23 17:15 ` Vegard Nossum
2016-08-23 17:33 ` Ben Hutchings
2016-08-23 16:40 ` CVE-2014-9900 fix is not upstream David Miller
2016-08-23 17:35 ` Ben Hutchings
2016-08-23 18:24 ` David Miller
2016-08-23 20:09 ` Al Viro
2016-08-23 20:34 ` Joe Perches [this message]
2016-08-23 20:49 ` Lennart Sorensen
2016-08-23 21:25 ` Al Viro
2016-08-24 14:03 ` Lennart Sorensen
2016-08-24 20:36 ` Hannes Frederic Sowa
2016-08-25 12:40 ` Johannes Berg
2016-08-25 12:41 ` Johannes Berg
2016-08-25 15:14 ` One Thousand Gnomes
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