samples/bpf: Add test/example of using bpf_probe_write_user bpf helper
authorSargun Dhillon <sargun@sargun.me>
Mon, 25 Jul 2016 12:55:02 +0000 (05:55 -0700)
committerDavid S. Miller <davem@davemloft.net>
Tue, 26 Jul 2016 01:07:48 +0000 (18:07 -0700)
commitcf9b1199de27ece1eafacf165933df10f0314232
tree17cb747b81a9fce3a7052efc639bbb83488df191
parent96ae52279594470622ff0585621a13e96b700600
samples/bpf: Add test/example of using bpf_probe_write_user bpf helper

This example shows using a kprobe to act as a dnat mechanism to divert
traffic for arbitrary endpoints. It rewrite the arguments to a syscall
while they're still in userspace, and before the syscall has a chance
to copy the argument into kernel space.

Although this is an example, it also acts as a test because the mapped
address is 255.255.255.255:555 -> real address, and that's not a legal
address to connect to. If the helper is broken, the example will fail
on the intermediate steps, as well as the final step to verify the
rewrite of userspace memory succeeded.

Signed-off-by: Sargun Dhillon <sargun@sargun.me>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
samples/bpf/Makefile
samples/bpf/test_probe_write_user_kern.c [new file with mode: 0644]
samples/bpf/test_probe_write_user_user.c [new file with mode: 0644]