kybaaz/linux-xiaomi-chiron
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

selftests/bpf: Add missing trampoline program type to trampoline_count test

Browse source 
Currently the trampoline_count test doesn't include any fmod_ret bpf
programs, fix it to make the test cover all possible trampoline program
types.

Since fmod_ret bpf programs can't be attached to __set_task_comm function,
as it's neither whitelisted for error injection nor a security hook, change
it to bpf_modify_return_test.

This patch also does some other cleanups such as removing duplicate code,
dropping inconsistent comments, etc.

Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220519150610.601313-1-ytcoode@gmail.com
This commit is contained in:
Yuntao Wang 2022-05-19 23:06:10 +08:00 • committed by Andrii Nakryiko
parent 96af42c50a
commit b23316aabf
3 changed files with 63 additions and 93 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/bpf.h
View file

@ -724,7 +724,7 @@ struct btf_func_model {
#define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
/* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
* bytes on x86. Pick a number to fit into BPF_IMAGE_SIZE / 2
* bytes on x86.
*/
#define BPF_MAX_TRAMP_LINKS 38