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Subject: RE: [PATCH 02/43] eal: use rte strerror
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Date: Wed, 15 Nov 2023 12:23:13 +0100
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Thread-Topic: [PATCH 02/43] eal: use rte strerror
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References: <20231114082539.1858594-1-huangdengdui@huawei.com>
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From: =?iso-8859-1?Q?Morten_Br=F8rup?= <mb@smartsharesystems.com>
To: "Stephen Hemminger" <stephen@networkplumber.org>,
 "Dengdui Huang" <huangdengdui@huawei.com>
Cc: <dev@dpdk.org>, <ferruh.yigit@amd.com>, <lihuisong@huawei.com>,
 <fengchengwen@huawei.com>, <liuyonglong@huawei.com>
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> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Wednesday, 15 November 2023 01.23
>=20
> On Tue, 14 Nov 2023 16:24:58 +0800
> Dengdui Huang <huangdengdui@huawei.com> wrote:
>=20
> > The function strerror() is insecure in a multi-thread environment.
> > This patch uses rte_strerror() to replace it.
> >
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Dengdui Huang <huangdengdui@huawei.com>
> > Acked-by: Chengwen Feng <fengchengwen@huawei.com>
> > ---
>=20
> Look at implementation of rte_strerror(), it still has issues if
> used from non-DPDK registered threads.

The macro names RTE_DEFINE_PER_LCORE() and RTE_PER_LCORE() strongly =
indicate that the variables are instantiated per lcore.

But they are not; they are instantiated per thread [1]:

#define RTE_DEFINE_PER_LCORE(type, name)			\
	__thread __typeof__(type) per_lcore_##name


[1]: =
https://elixir.bootlin.com/dpdk/v23.11-rc3/source/lib/eal/include/rte_per=
_lcore.h#L37