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Tue, 19 Nov 2019 04:37:03 -0800 To: Ferruh Yigit , Thomas Monjalon CC: , References: <1574151770-25925-1-git-send-email-arybchenko@solarflare.com> <92cd3fb9-ae97-37cc-79ec-8b01e341504a@intel.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 ITSxgNFCTbeJ03zL2MR5s0IvD9ghISAwZ6ieCjU5UATn5+63qpD0nVNLsAdb/UpfvQcKAmvj 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Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <92cd3fb9-ae97-37cc-79ec-8b01e341504a@intel.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Language: en-GB X-Originating-IP: [91.220.146.112] X-ClientProxiedBy: ocex03.SolarFlarecom.com (10.20.40.36) To ocex03.SolarFlarecom.com (10.20.40.36) X-TM-AS-Product-Ver: SMEX-12.5.0.1300-8.5.1010-25050.005 X-TM-AS-Result: No-9.784300-4.000000-10 X-TMASE-MatchedRID: eVEkOcJu0F7mLzc6AOD8DfHkpkyUphL92zgw5RT/BrYhg/had72R1OSZ sOHi07gEeCbFg/ja92gEAMtyscj98deQCip1RHVUoxjrap5AGQtVogWRsEaR/sz/SxKo9mJ4bhF mrkG9+jPrh8E2or8k5tuYfgI/CeEBLEsdSh2aJpTiHyvyXeXh5i+w46aA6jWZuM5RdaZDc5bVEG +v966cksQs3sq9RbzoHLpMZea34UwxhcKMC/TCz5gU4ValU4iDWt0oPygerN1jEZl+QzZVx4vN+ tnJlZmAyTEpIqig6S5TvVffeIwvQ5zAN0sNcMp5PwKTD1v8YV5UENBIMyKD0dEsTITobgNEFOOa ygn1UTGOfMKGwpDs0JGTpe1iiCJq71zr0FZRMbBWdFebWIc3VsRB0bsfrpPIfiAqrjYtFiTY67w DhmsVXwnB/M8jldffMnm41rmh03reUqF+rKOmMH7cGd19dSFd X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--9.784300-4.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1010-25050.005 X-MDID: 1574167035-jz_rB_KVme5m Subject: Re: [dpdk-stable] [PATCH] ethdev: avoid undefined behaviour on configuration copying X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" 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. > 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, 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) >>