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2019 13:25:48 +0000 To: Ferruh Yigit , Thomas Monjalon CC: , References: <1574151770-25925-1-git-send-email-arybchenko@solarflare.com> <92cd3fb9-ae97-37cc-79ec-8b01e341504a@intel.com> <34e94334-931f-cd89-dc76-ce3a73f34b1a@solarflare.com> From: Andrew Rybchenko Openpgp: preference=signencrypt Autocrypt: addr=arybchenko@solarflare.com; keydata= mQINBF2681gBEACbdTxu8eLL3UX2oAelsnK9GkeaJeUYSOHPJQpV7RL/iaIskqTwBRnhjXt7 j9UEwGA+omnOmqQMpeQTb/F9Ma2dYE+Hw4/t/1KVjxr3ehFaASvwR4fWJfO4e2l/Rk4rG6Yi 5r6CWU2y8su2654Fr8KFc+cMGOAgKoZTZHZsRy5lHpMlemeF+VZkv8L5sYJWPnsypgqlCG3h v6lbtfZs+QqYbFH6bqoZwBAl5irmxywGR7ZJr1GLUZZ1lfdazSY8r6Vz0/Ip/KVxGu2uxo81 QCsAj0ZsQtwji9Sds/prTiPrIjx8Fc/tfbnAuVuPcnPbczwCJACzQr4q26XATL3kVuZhSBWh 4XfO/EAUuEq5AemUG5DDTM87g7Lp4eT9gMZB6P+rJwWPNWTiV3L7Cn+fO+l9mTPnOqdzBgDe OaulKiNSft1o0DY4bGzOmM2ad2cZt0jfnbMPMTE9zsr6+RFa+M8Ct20o6U1MUE4vP6veErMK of4kZ8PdoMM+Sq1hxMPNtlcVBSP9xMmdSZPlfDYI5VWosOceEcz7XZdjBJKdwKuz70V7eac4 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<9a4ce591-ca9a-2cd6-33d5-df30d3e066c1@solarflare.com> Date: Tue, 19 Nov 2019 16:25:38 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Language: en-GB Content-Transfer-Encoding: 7bit X-Originating-IP: [91.220.146.112] X-ClientProxiedBy: ocex03.SolarFlarecom.com (10.20.40.36) To ukex01.SolarFlarecom.com (10.17.10.4) X-TM-AS-Product-Ver: SMEX-12.5.0.1300-8.5.1010-25052.003 X-TM-AS-Result: No-12.727000-8.000000-10 X-TMASE-MatchedRID: vEvJ7Rh1lGjmLzc6AOD8DfHkpkyUphL92zgw5RT/BrYhg/had72R1OSZ sOHi07gEeCbFg/ja92gEAMtyscj98deQCip1RHVUoxjrap5AGQtVogWRsEaR/sz/SxKo9mJ4bhF mrkG9+jPrh8E2or8k5tuYfgI/CeEBLEsdSh2aJpTiHyvyXeXh5i+w46aA6jWZuM5RdaZDc5bDhg I4nyd1hvCyD6Obi7IeOjkArWCWTZXQy+lsshTJ7iiWKOSuD9akWt0oPygerN0k1SrS1we7ReGvL Y3BNJcclNec8uhHiF3EiWaNVXpRKhKRdQW2L01mqJSK+HSPY+/pVMb1xnESMljBUeMsjed6QBzo PKhLashO9UxJ8vboSWGr6HtKJQTVzD8138PYfo6eAiCmPx4NwLTrdaH1ZWqC1B0Hk1Q1KyLUZxE AlFPo846HM5rqDwqt8xjk35gq+QmLthF5k1kes1ZzkN0LEf5jxdOQ2QpDFHmovHWyC+AZAw== X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--12.727000-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1010-25052.003 X-MDID: 1574169955-6qfp0R9Z3FZR Subject: Re: [dpdk-dev] [PATCH] ethdev: avoid undefined behaviour on configuration copying X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 11/19/19 4:19 PM, Ferruh Yigit wrote: > On 11/19/2019 12:36 PM, Andrew Rybchenko wrote: >> On 11/19/19 3:24 PM, Ferruh Yigit wrote: >>> On 11/19/2019 8:22 AM, Andrew Rybchenko wrote: >>>> memcpy() source and destination areas must not overlap and equal >>>> pointers is the case which is really met, so handle it. >>> Agree providing same config as input can cause problem with current >>> implementation, but it is the limitation of the memcpy, the API doesn't request >>> this. >>> >>> We can fix as you suggested, in this case we should document this in API >>> documentation I think, >> >> Basically the patch solves it and there is nothing to document. >> If pointers are equal there is nothing to do, no copying required. > > You are right, scratch my comment. I overlooked as just overlapping memory issue. > >> >>> we can also solve this by updating the implementation to let this, using an >>> interim buffer in the simplest measure, not sure which one is better. >> >> I don't think that interim buffer is required, 'if' perfectly does the job. >> >>> Any practical reason to prevent this other than 'memcpy' limitation? >> >> Nothing except application should not play with dev->data, > > +1. > Bonding PMD though not exactly an application, not sure to let or not it to > update 'dev->data' I think it is an application for its slaves, so it is better to have no exceptions. >> but I'm not sure if it is the right place to forbid it. >> >> Alternative solution is to fix bonding and return error if dev_conf is >> equal to &dev->data->dev_conf since usecase is unclear and callers >> should not use dev->data. >> >>>> Fixes: 68b931bff287 ("ethdev: eliminate interim variable") >>>> Cc: stable@dpdk.org >>>> >>>> Signed-off-by: Andrew Rybchenko >>>> --- >>>> slave_configure() in drivers/net/bonding calls rte_eth_dev_configure() >>>> with &slave_eth_dev->data->dev_conf. >>>> >>>> Alternative solution is to fix bonding and return error if dev_conf is >>>> equal to &dev->data->dev_conf since usecase is unclear and callers >>>> should not use dev->data. >>>> >>>> lib/librte_ethdev/rte_ethdev.c | 4 +++- >>>> 1 file changed, 3 insertions(+), 1 deletion(-) >>>> >>>> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c >>>> index 8f48e8d659..8d2ce31a81 100644 >>>> --- a/lib/librte_ethdev/rte_ethdev.c >>>> +++ b/lib/librte_ethdev/rte_ethdev.c >>>> @@ -1245,7 +1245,9 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q, >>>> * Copy the dev_conf parameter into the dev structure. >>>> * rte_eth_dev_info_get() requires dev_conf, copy it before dev_info get >>>> */ >>>> - memcpy(&dev->data->dev_conf, dev_conf, sizeof(dev->data->dev_conf)); >>>> + if (dev_conf != &dev->data->dev_conf) >>>> + memcpy(&dev->data->dev_conf, dev_conf, >>>> + sizeof(dev->data->dev_conf)); >>>> >>>> ret = rte_eth_dev_info_get(port_id, &dev_info); >>>> if (ret != 0) >>>> >> >