From: Mickaël Salaün <m...@digikod.net>
Date: Mon,  7 Aug 2017 20:45:20 +0200

> The function check_uarg_tail_zero() was created from bpf(2) for
> BPF_OBJ_GET_INFO_BY_FD without taking the access_ok() nor the PAGE_SIZE
> checks. Make this checks more generally available while unlikely to be
> triggered, extend the memory range check and add an explanation
> including why the ToCToU should not be a security concern.
> 
> Signed-off-by: Mickaël Salaün <m...@digikod.net>
> Acked-by: Daniel Borkmann <dan...@iogearbox.net>
> Cc: Alexei Starovoitov <a...@kernel.org>
> Cc: David S. Miller <da...@davemloft.net>
> Cc: Kees Cook <keesc...@chromium.org>
> Cc: Martin KaFai Lau <ka...@fb.com>
> Link: 
> https://lkml.kernel.org/r/CAGXu5j+vRGFvJZmjtAcT8Hi8B+Wz0e1b6VKYZHfQP_=dxzc...@mail.gmail.com

Applied.

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