linux/samples
Sargun Dhillon cf9b1199de 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>
2016-07-25 18:07:48 -07:00
..
bpf samples/bpf: Add test/example of using bpf_probe_write_user bpf helper 2016-07-25 18:07:48 -07:00
configfs configfs: remove old API 2015-10-13 22:17:57 -07:00
connector samples: connector: from Documentation to samples directory 2016-04-28 07:47:35 -06:00
hidraw HID: samples/hidraw: make it possible to select device 2015-03-15 10:11:21 -04:00
hw_breakpoint perf: Add context field to perf_event 2011-07-01 11:06:38 +02:00
kdb kdb: Add kdb kernel module sample 2010-10-29 13:14:39 -05:00
kfifo kfifo API type safety 2013-11-15 09:32:23 +09:00
kobject samples/kobject: be explicit in the module license 2015-03-25 13:41:42 +01:00
kprobes samples/kprobes: print out the symbol name for the hooks 2016-05-20 17:58:30 -07:00
livepatch livepatch: reuse module loader code to write relocations 2016-04-01 15:00:11 +02:00
pktgen samples: Add an IPv6 '-6' option to the pktgen scripts 2016-07-20 22:16:02 -07:00
rpmsg rpmsg: use module_rpmsg_driver in existing drivers and examples 2016-05-06 11:09:01 -07:00
seccomp samples/seccomp: improve label helper 2015-02-17 14:34:55 -08:00
trace_events Sample: Trace_event: Correct the comments 2015-11-02 14:09:15 -05:00
uhid HID: uhid: improve uhid example client 2013-09-04 11:35:14 +02:00
v4l [media] samples: v4l: from Documentation to samples directory 2016-05-09 18:34:37 -03:00
Kconfig samples: connector: from Documentation to samples directory 2016-04-28 07:47:35 -06:00
Makefile [media] samples: v4l: from Documentation to samples directory 2016-05-09 18:34:37 -03:00