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From: David Marchand <david.marchand@redhat.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	Luc Pelletier <lucp.at.work@gmail.com>
Cc: "Richardson, Bruce" <bruce.richardson@intel.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	 "Li, Xiaoyun" <xiaoyun.li@intel.com>,
	"stable@dpdk.org" <stable@dpdk.org>,
	 Aaron Conole <aconole@redhat.com>,
	Owen Hilyard <ohilyard@iol.unh.edu>
Subject: Re: [PATCH v7] eal: fix rte_memcpy strict aliasing/alignment bugs
Date: Thu, 7 Apr 2022 17:24:07 +0200	[thread overview]
Message-ID: <CAJFAV8yxK-qqQtNLrNFqyo1T+6qTSGfotSGufgR1SOY1muMzdg@mail.gmail.com> (raw)
In-Reply-To: <DM6PR11MB449118A6002204BEA83D1B7A9A0B9@DM6PR11MB4491.namprd11.prod.outlook.com>

On Thu, Mar 10, 2022 at 3:55 PM Ananyev, Konstantin
<konstantin.ananyev@intel.com> wrote:
> > Calls to rte_memcpy for 1 < n < 16 could result in unaligned
> > loads/stores, which is undefined behaviour according to the C
> > standard, and strict aliasing violations.
> >
> > The code was changed to use a packed structure that allows aliasing
> > (using the __may_alias__ attribute) to perform the load/store
> > operations. This results in code that has the same performance as the
> > original code and that is also C standards-compliant.
> >
> > Fixes: d35cc1fe6a7a ("eal/x86: revert select optimized memcpy at run-time")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Luc Pelletier <lucp.at.work@gmail.com>
> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
> Tested-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

Thanks, applied.


> As a side note, we probably need to check other similar places in DPDK code.

What would be the best way to detect those problematic places?

I tried UBsan, and it did report some of the issues fixed with this patch.


-- 
David Marchand


  reply	other threads:[~2022-04-07 15:24 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-15 19:41 [PATCH] eal: fix unaligned loads/stores in rte_memcpy_generic Luc Pelletier
2022-01-15 21:39 ` [PATCH v2] " Luc Pelletier
2022-01-15 22:13   ` Stephen Hemminger
2022-01-16 14:09     ` Luc Pelletier
2022-01-16 16:32       ` Stephen Hemminger
2022-01-24 23:21         ` Georg Sauthoff
2022-01-25  7:59           ` Morten Brørup
2022-01-25 19:57           ` Luc Pelletier
2022-01-16 14:13 ` [PATCH v3] " Luc Pelletier
2022-01-16 14:33   ` Luc Pelletier
2022-01-16 16:34     ` Stephen Hemminger
2022-01-16 17:59       ` Morten Brørup
2022-01-16 20:33 ` [PATCH v4] " Luc Pelletier
2022-01-17 15:37 ` [PATCH v5] " Luc Pelletier
2022-02-04 16:42   ` Luc Pelletier
2022-02-04 17:16   ` Ananyev, Konstantin
2022-02-08 16:53     ` Thomas Monjalon
2022-02-09 15:05     ` Luc Pelletier
2022-02-10 14:04       ` Ananyev, Konstantin
2022-02-10 16:56         ` Luc Pelletier
2022-02-11 15:51           ` Ananyev, Konstantin
2022-02-13 22:31             ` Luc Pelletier
2022-02-14 13:41               ` Ananyev, Konstantin
2022-02-25 15:51 ` [PATCH v6] eal: fix rte_memcpy strict aliasing/alignment bugs Luc Pelletier
2022-02-25 16:38 ` [PATCH v7] " Luc Pelletier
2022-03-10 14:55   ` Ananyev, Konstantin
2022-04-07 15:24     ` David Marchand [this message]
2022-04-07 15:32       ` David Marchand
2022-04-07 15:40         ` David Marchand
2022-05-13 19:15           ` Luc Pelletier
2022-05-19 16:41             ` David Marchand
2022-04-08 13:47       ` Luc Pelletier
2022-05-19 16:47       ` David Marchand

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