From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Wei Liu <wei.liu2@citrix.com>,
George Dunlap <George.Dunlap@eu.citrix.com>,
Tim Deegan <tim@xen.org>, Xen-devel <xen-devel@lists.xen.org>,
Julien Grall <julien.grall@arm.com>,
Jan Beulich <JBeulich@suse.com>
Subject: Re: [PATCH] xen/public: Correct the definition of GNTTAB_CACHE_SOURCE_GREF
Date: Tue, 17 Oct 2017 16:19:19 -0400 [thread overview]
Message-ID: <20171017201919.GF31442@char.us.oracle.com> (raw)
In-Reply-To: <1508249511-22385-1-git-send-email-andrew.cooper3@citrix.com>
On Tue, Oct 17, 2017 at 03:11:51PM +0100, Andrew Cooper wrote:
> Discovered when running the XSA-232 PoC on a UBSAN-enabled hypervisor.
>
> (d79) XSA-232 PoC
> (XEN) ================================================================================
> (XEN) UBSAN: Undefined behaviour in grant_table.c:3217:25
> (XEN) left shift of 1 by 31 places cannot be represented in type 'int'
> (XEN) ----[ Xen-4.10.0-rc x86_64 debug=y Tainted: H ]----
>
> Update all of the GNTTAB_CACHE_* constants to be unsigned integers.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
> ---
> CC: George Dunlap <George.Dunlap@eu.citrix.com>
> CC: Jan Beulich <JBeulich@suse.com>
> CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> CC: Stefano Stabellini <sstabellini@kernel.org>
> CC: Tim Deegan <tim@xen.org>
> CC: Wei Liu <wei.liu2@citrix.com>
> CC: Julien Grall <julien.grall@arm.com>
>
> This is a trivial bugfix, and is low risk for 4.10
> ---
> xen/include/public/grant_table.h | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/xen/include/public/grant_table.h b/xen/include/public/grant_table.h
> index 018036e..180d62c 100644
> --- a/xen/include/public/grant_table.h
> +++ b/xen/include/public/grant_table.h
> @@ -589,9 +589,9 @@ struct gnttab_cache_flush {
> } a;
> uint16_t offset; /* offset from start of grant */
> uint16_t length; /* size within the grant */
> -#define GNTTAB_CACHE_CLEAN (1<<0)
> -#define GNTTAB_CACHE_INVAL (1<<1)
> -#define GNTTAB_CACHE_SOURCE_GREF (1<<31)
> +#define GNTTAB_CACHE_CLEAN (1u<<0)
> +#define GNTTAB_CACHE_INVAL (1u<<1)
> +#define GNTTAB_CACHE_SOURCE_GREF (1u<<31)
> uint32_t op;
> };
> typedef struct gnttab_cache_flush gnttab_cache_flush_t;
> --
> 2.1.4
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> https://lists.xen.org/xen-devel
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
next prev parent reply other threads:[~2017-10-17 20:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-17 14:11 [PATCH] xen/public: Correct the definition of GNTTAB_CACHE_SOURCE_GREF Andrew Cooper
2017-10-17 14:14 ` Wei Liu
2017-10-17 20:19 ` Konrad Rzeszutek Wilk [this message]
2017-10-19 11:11 ` Julien Grall
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171017201919.GF31442@char.us.oracle.com \
--to=konrad.wilk@oracle.com \
--cc=George.Dunlap@eu.citrix.com \
--cc=JBeulich@suse.com \
--cc=andrew.cooper3@citrix.com \
--cc=julien.grall@arm.com \
--cc=sstabellini@kernel.org \
--cc=tim@xen.org \
--cc=wei.liu2@citrix.com \
--cc=xen-devel@lists.xen.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).