From: Alexei Starovoitov <ast@kernel.org>
Date: Thu, 1 Aug 2019 20:55:53 +0000 (-0700)
Subject: Merge branch 'setsockopt-extra-mem'
X-Git-Tag: for-linus-2019-09-27~91^2~248^2~12
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=02bc2b64940e00cf1e2809600498433f1fbc698a;p=linux-2.6-block.git

Merge branch 'setsockopt-extra-mem'

Stanislav Fomichev says:

====================
Current setsockopt hook is limited to the size of the buffer that
user had supplied. Since we always allocate memory and copy the value
into kernel space, allocate just a little bit more in case BPF
program needs to override input data with a larger value.

The canonical example is TCP_CONGESTION socket option where
input buffer is a string and if user calls it with a short string,
BPF program has no way of extending it.

The tests are extended with TCP_CONGESTION use case.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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02bc2b64940e00cf1e2809600498433f1fbc698a