Merge branch 'setsockopt-extra-mem'

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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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This commit is contained in:

Alexei Starovoitov 2019-08-01 13:55:53 -07:00

parent a98bf57391 fd5ef31f37

commit 02bc2b6494

3 changed files with 60 additions and 4 deletions

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17

kernel/bpf/cgroup.c

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22

tools/testing/selftests/bpf/progs/sockopt_sk.c

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25

tools/testing/selftests/bpf/test_sockopt_sk.c

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