linux-kernel - Re: [PATCH] bpf: explicitly memset the bpf

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Message-ID: <cea7babd-48a6-d89a-c93b-32659d6d8a28@iogearbox.net>
Date:   Fri, 20 Mar 2020 21:07:24 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexei Starovoitov <ast@...nel.org>
Cc:     Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>,
        Yonghong Song <yhs@...com>, Andrii Nakryiko <andriin@...com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Maciej Żenczykowski <maze@...gle.com>,
        John Stultz <john.stultz@...aro.org>,
        Alexander Potapenko <glider@...gle.com>,
        Alistair Delva <adelva@...gle.com>
Subject: Re: [PATCH] bpf: explicitly memset the bpf_attr structure

On 3/20/20 10:48 AM, Greg Kroah-Hartman wrote:
> For the bpf syscall, we are relying on the compiler to properly zero out
> the bpf_attr union that we copy userspace data into.  Unfortunately that
> doesn't always work properly, padding and other oddities might not be
> correctly zeroed, and in some tests odd things have been found when the
> stack is pre-initialized to other values.
> 
> Fix this by explicitly memsetting the structure to 0 before using it.
> 
> Reported-by: Maciej Żenczykowski <maze@...gle.com>
> Reported-by: John Stultz <john.stultz@...aro.org>
> Reported-by: Alexander Potapenko <glider@...gle.com>
> Reported-by: Alistair Delva <adelva@...gle.com>
> Cc: stable <stable@...r.kernel.org>
> Link: https://android-review.googlesource.com/c/kernel/common/+/1235490
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Applied, thanks!