Re: [PATCH] bpf: explicitly memset the bpf_attr structure

[Daniel Borkmann]

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 Åenczykowski <maze@xxxxxxxxxx>
> Reported-by: John Stultz <john.stultz@xxxxxxxxxx>
> Reported-by: Alexander Potapenko <glider@xxxxxxxxxx>
> Reported-by: Alistair Delva <adelva@xxxxxxxxxx>
> Cc: stable <stable@xxxxxxxxxxxxxxx>
> Link: https://android-review.googlesource.com/c/kernel/common/+/1235490
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

Applied, thanks!