linux-hardening - Re: [fortify] 54d9469bc5: WARNING:at_fs/nfs/namespace.c:#nfs_d

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Message-ID: <202210102352.B80BC62@keescook>
Date:   Mon, 10 Oct 2022 23:54:01 -0700
From:   Kees Cook <keescook@...omium.org>
To:     kernel test robot <yujie.liu@...el.com>
Cc:     lkp@...ts.01.org, lkp@...el.com, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: Re: [fortify] 54d9469bc5:
 WARNING:at_fs/nfs/namespace.c:#nfs_d_automount

On Tue, Oct 11, 2022 at 11:45:56AM +0800, kernel test robot wrote:
> FYI, we noticed the following commit (built with gcc-11):
> 
> commit: 54d9469bc515dc5fcbc20eecbe19cea868b70d68 ("fortify: Add run-time WARN for cross-field memcpy()")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> 
> [...]
> [   57.256986][ T4357] memcpy: detected field-spanning write (size 28) of single field "&ctx->nfs_server.address" at fs/nfs/namespace.c:178 (size 16)

Thanks for the report! I've sent a patch for this now:
https://lore.kernel.org/lkml/20221011065243.583650-1-keescook@chromium.org/

-- 
Kees Cook