linux-kernel - Re: [PATCH] etherdevice: Adjust ether_addr* prototypes to silence -Wstringop-overead

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Date:   Mon, 14 Feb 2022 11:20:10 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Kees Cook <keescook@...omium.org>
Cc:     kuba@...nel.org, mkl@...gutronix.de, davem@...emloft.net,
        netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        hawk@...nel.org, john.fastabend@...il.com, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        kpsingh@...nel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] etherdevice: Adjust ether_addr* prototypes to silence
 -Wstringop-overead

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@...emloft.net>:

On Sat, 12 Feb 2022 09:14:49 -0800 you wrote:
> With GCC 12, -Wstringop-overread was warning about an implicit cast from
> char[6] to char[8]. However, the extra 2 bytes are always thrown away,
> alignment doesn't matter, and the risk of hitting the edge of unallocated
> memory has been accepted, so this prototype can just be converted to a
> regular char *. Silences:
> 
> net/core/dev.c: In function ‘bpf_prog_run_generic_xdp’: net/core/dev.c:4618:21: warning: ‘ether_addr_equal_64bits’ reading 8 bytes from a region of size 6 [-Wstringop-overread]
>  4618 |         orig_host = ether_addr_equal_64bits(eth->h_dest, > skb->dev->dev_addr);
>       |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> net/core/dev.c:4618:21: note: referencing argument 1 of type ‘const u8[8]’ {aka ‘const unsigned char[8]’}
> net/core/dev.c:4618:21: note: referencing argument 2 of type ‘const u8[8]’ {aka ‘const unsigned char[8]’}
> In file included from net/core/dev.c:91: include/linux/etherdevice.h:375:20: note: in a call to function ‘ether_addr_equal_64bits’
>   375 | static inline bool ether_addr_equal_64bits(const u8 addr1[6+2],
>       |                    ^~~~~~~~~~~~~~~~~~~~~~~
> 
> [...]

Here is the summary with links:
  - etherdevice: Adjust ether_addr* prototypes to silence -Wstringop-overead
    https://git.kernel.org/netdev/net-next/c/2618a0dae09e

You are awesome, thank you!
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