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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: dev@dpdk.org, stable@dpdk.org
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Message-ID: <6bcc0a2c-9dbb-eefb-412c-10fea466e213@intel.com>
Date: Wed, 20 Jun 2018 18:04:42 +0100
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Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] kni: fix build with gcc 8.1
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On 6/20/2018 5:39 PM, Ferruh Yigit wrote:
> On 6/20/2018 12:35 AM, Stephen Hemminger wrote:
>> On Tue, 19 Jun 2018 13:08:55 +0100
>> Ferruh Yigit <ferruh.yigit@intel.com> wrote:
>>
>>> Error observed when CONFIG_RTE_KNI_KMOD_ETHTOOL config option is
>>> enabled.
>>>
>>> build error:
>>> In function ‘strncpy’,
>>> inlined from ‘igb_get_drvinfo’ at
>>> .../dpdk/build/build/kernel/linux/kni/igb_ethtool.c:814:2:
>>> .../include/linux/string.h:246:9: error: ‘__builtin_strncpy’ output
>>> may be truncated copying 31 bytes from a string of length 42
>>> [-Werror=stringop-truncation]
>>> return __builtin_strncpy(p, q, size);
>>> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>
>>> Fixed by reducing the adapter->fw_version size and adjusting strncpy
>>> limit size.
>>>
>>> Cc: stable@dpdk.org
>>>
>>> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
>>> ---
>>> kernel/linux/kni/ethtool/igb/igb.h | 2 +-
>>> kernel/linux/kni/ethtool/igb/igb_ethtool.c | 2 +-
>>> 2 files changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/kernel/linux/kni/ethtool/igb/igb.h b/kernel/linux/kni/ethtool/igb/igb.h
>>> index 8aa2a3088..5e798ae83 100644
>>> --- a/kernel/linux/kni/ethtool/igb/igb.h
>>> +++ b/kernel/linux/kni/ethtool/igb/igb.h
>>> @@ -592,7 +592,7 @@ struct igb_adapter {
>>> int int_mode;
>>> u32 rss_queues;
>>> u32 vmdq_pools;
>>> - char fw_version[43];
>>> + char fw_version[32];
>>
>> Use ETHTOOL_FWVERS_LEN?
>
> Yes, that is what drvinfo->fw_version uses, and it seems it has been around
> enough to not cause any build issue, will use that one.
Ah so much fun, it has been updated to 43 by me in the past, to prevent another
warning [1] which another part of code has potential to write larger string to
fw_version.
Reducing value back to 32 may bring back that old warning ...
[1]
Fixes: c3698192940c ("kni: fix build with gcc 7.1")
>
>>
>>> u32 wvbr;
>>> struct igb_mac_addr *mac_table;
>>> #ifdef CONFIG_IGB_VMDQ_NETDEV
>>> diff --git a/kernel/linux/kni/ethtool/igb/igb_ethtool.c b/kernel/linux/kni/ethtool/igb/igb_ethtool.c
>>> index 064528bcf..0b8b25ff1 100644
>>> --- a/kernel/linux/kni/ethtool/igb/igb_ethtool.c
>>> +++ b/kernel/linux/kni/ethtool/igb/igb_ethtool.c
>>> @@ -812,7 +812,7 @@ static void igb_get_drvinfo(struct net_device *netdev,
>>> strncpy(drvinfo->version, igb_driver_version, sizeof(drvinfo->version) - 1);
>>>
>>> strncpy(drvinfo->fw_version, adapter->fw_version,
>>> - sizeof(drvinfo->fw_version) - 1);
>>> + sizeof(drvinfo->fw_version));
>>
>> Why not:
>> strlcpy(drvinfo->fw_version, adapter->fw_version,
>> sizeof(drvinfo->fw_version));
>
> Just to be cautious about changing API, to not have any problem with older
> version of kernels.
> But it seems strlcpy supported long enough to not cause an issue, I will use it.
>