linux-kernel - Re: [PATCH] bnxt_en: avoid string overflow for record->system

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Date:   Mon, 13 Aug 2018 20:46:30 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     michael.chan@...adcom.com, vasundhara-v.volam@...adcom.com,
        scott.branden@...adcom.com, gospo@...adcom.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bnxt_en: avoid string overflow for record->system_name

From: Arnd Bergmann <arnd@...db.de>
Date: Mon, 13 Aug 2018 23:26:54 +0200

> The utsname()->nodename string may be 64 bytes long, and it gets
> copied without the trailing nul byte into the shorter record->system_name,
> as gcc now warns:
> 
> In file included from include/linux/bitmap.h:9,
>                  from include/linux/ethtool.h:16,
>                  from drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c:13:
> In function 'strncpy',
>     inlined from 'bnxt_fill_coredump_record' at drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c:2863:2:
> include/linux/string.h:254:9: error: '__builtin_strncpy' output truncated before terminating nul copying as many bytes from a string as its length [-Werror=stringop-truncation]
> 
> Using strlcpy() at least avoids overflowing the destination buffer
> and adds proper nul-termination. It may still truncate long names
> though, which probably can't be solved here.
> 
> Fixes: 6c5657d085ae ("bnxt_en: Add support for ethtool get dump.")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied.