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Date:   Thu, 11 Aug 2022 12:05:28 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@...il.com>
Cc:     Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-next@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org
Subject: Re: build failure of next-20220811 due to 332f1795ca20 ("Bluetooth:
 L2CAP: Fix l2cap_global_chan_by_psm regression")

On Thu, 11 Aug 2022 19:53:04 +0100 Sudip Mukherjee (Codethink) wrote:
> Hi All,
> 
> Not sure if it has been reported, builds of csky and mips allmodconfig
> failed to build next-20220811 with gcc-12.

Heh, 2 minutes after I submitted it to Linus :S

> mips error is:
> 
> In function 'memcmp',
>     inlined from 'bacmp' at ./include/net/bluetooth/bluetooth.h:347:9,
>     inlined from 'l2cap_global_chan_by_psm' at net/bluetooth/l2cap_core.c:2003:15:
> ./include/linux/fortify-string.h:44:33: error: '__builtin_memcmp' specified bound 6 exceeds source size 0 [-Werror=stringop-overread]

Source is the second argument? memcmp does not really have src and dst..

Assuming it's the second one it appears to object to the:

#define BDADDR_ANY  (&(bdaddr_t) {{0, 0, 0, 0, 0, 0}})

Which, well, kinda understandable but why does it not dislike the same
construct when used in the other 70 places in the tree?

My preferred fix would be to do the same thing as we do for ethernet
i.e. open code the helper, see is_zero_ether_addr().

>    44 | #define __underlying_memcmp     __builtin_memcmp
>       |                                 ^
> ./include/linux/fortify-string.h:420:16: note: in expansion of macro '__underlying_memcmp'
>   420 |         return __underlying_memcmp(p, q, size);
>       |                ^~~~~~~~~~~~~~~~~~~
> In function 'memcmp',
>     inlined from 'bacmp' at ./include/net/bluetooth/bluetooth.h:347:9,
>     inlined from 'l2cap_global_chan_by_psm' at net/bluetooth/l2cap_core.c:2004:15:
> ./include/linux/fortify-string.h:44:33: error: '__builtin_memcmp' specified bound 6 exceeds source size 0 [-Werror=stringop-overread]
>    44 | #define __underlying_memcmp     __builtin_memcmp
>       |                                 ^
> ./include/linux/fortify-string.h:420:16: note: in expansion of macro '__underlying_memcmp'
>   420 |         return __underlying_memcmp(p, q, size);
>       |                ^~~~~~~~~~~~~~~~~~~
> 
> 
> csky error is:
> 
> In file included from net/bluetooth/l2cap_core.c:37:
> In function 'bacmp',
>     inlined from 'l2cap_global_chan_by_psm' at net/bluetooth/l2cap_core.c:2003:15:
> ./include/net/bluetooth/bluetooth.h:347:16: error: 'memcmp' specified bound 6 exceeds source size 0 [-Werror=stringop-overread]
>   347 |         return memcmp(ba1, ba2, sizeof(bdaddr_t));
>       |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> In function 'bacmp',
>     inlined from 'l2cap_global_chan_by_psm' at net/bluetooth/l2cap_core.c:2004:15:
> ./include/net/bluetooth/bluetooth.h:347:16: error: 'memcmp' specified bound 6 exceeds source size 0 [-Werror=stringop-overread]
>   347 |         return memcmp(ba1, ba2, sizeof(bdaddr_t));
>       |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> 
> git bisect pointed to 332f1795ca20 ("Bluetooth: L2CAP: Fix l2cap_global_chan_by_psm regression").
> And, reverting that commit has fixed the build failure.
> 
> I will be happy to test any patch or provide any extra log if needed.
> 
> --
> Regards
> Sudip

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