From: Stephen Hemminger <stephen@networkplumber.org>
To: dev@dpdk.org
Cc: "Morten Brørup" <mb@smartsharesystems.com>,
"Bruce Richardson" <bruce.richardson@intel.com>,
"Konstantin Ananyev" <konstantin.v.ananyev@yandex.ru>,
"Zhihong Wang" <wangzhihong.wzh@bytedance.com>,
"Yuanhan Liu" <yliu@fridaylinux.org>,
"Xiaoyun Li" <xiaoyun.li@intel.com>
Subject: Re: [PATCH] rte_memcpy: fix off by one for size 16 and 32
Date: Sat, 2 Mar 2024 12:56:47 -0800 [thread overview]
Message-ID: <20240302125647.63ef6aec@hermes.local> (raw)
In-Reply-To: <20240302204923.227105-1-stephen@networkplumber.org>
On Sat, 2 Mar 2024 12:49:23 -0800
Stephen Hemminger <stephen@networkplumber.org> wrote:
> The rte_memcpy code would do extra instructions for size 16
> and 32 which potentially could reference past end of data.
>
> For size of 16, only single mov16 is needed.
> same for size of 32, only single mov32.
>
> Fixes: f5472703c0bd ("eal: optimize aligned memcpy on x86")
> Fixes: d35cc1fe6a7a ("eal/x86: revert select optimized memcpy at run-time")
>
> Suggested-by: Morten Brørup <mb@smartsharesystems.com>
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Self-NAK, more is needed here.
The code has lots of pre-existing bugs where it will reference past the end
of the data in some cases.
next prev parent reply other threads:[~2024-03-02 20:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-02 20:49 Stephen Hemminger
2024-03-02 20:56 ` Stephen Hemminger [this message]
2024-03-02 22:10 ` Morten Brørup
2024-03-03 6:46 ` Mattias Rönnblom
2024-03-02 23:57 ` Morten Brørup
2024-03-03 6:47 ` Mattias Rönnblom
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