kernel.git/tools/testing/selftests/bpf/test_get_stack_rawtp.c, branch linux-4.20.yHosts the 0x221E linux distro kernel.
https://git.0xinfinity.dev/distro/kernel.git/atom?h=linux-4.20.y2018-04-29T15:45:54Ztools/bpf: add a test for bpf_get_stack with raw tracepoint prog2018-04-29T15:45:54ZYonghong Song2018-04-29T05:28:15Zurn:sha1:173965fbfba596c02fa128966c2a33cb88afcd7f
The test attached a raw_tracepoint program to raw_syscalls/sys_enter.
It tested to get stack for user space, kernel space and user
space with build_id request. It also tested to get user
and kernel stack into the same buffer with back-to-back
bpf_get_stack helper calls.
If jit is not enabled, the user space application will check
to ensure that the kernel function for raw_tracepoint
___bpf_prog_run is part of the stack.
If jit is enabled, we did not have a reliable way to
verify the kernel stack, so just assume the kernel stack
is good when the kernel stack size is greater than 0.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>