mirror/libbpf
1
0
Fork 0
mirror of https://github.com/netdata/libbpf.git synced 2026-03-27 03:39:06 +08:00
Code Issues Packages Projects Releases Wiki Activity

libbpf: support BPF token path setting through LIBBPF_BPF_TOKEN_PATH envvar

Browse Source 
To allow external admin authority to override default BPF FS location
(/sys/fs/bpf) for implicit BPF token creation, teach libbpf to recognize
LIBBPF_BPF_TOKEN_PATH envvar. If it is specified and user application
didn't explicitly specify neither bpf_token_path nor bpf_token_fd
option, it will be treated exactly like bpf_token_path option,
overriding default /sys/fs/bpf location and making BPF token mandatory.

Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20231213190842.3844987-10-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko
2023-12-13 11:08:41 -08:00
committed by Andrii Nakryiko
parent 5df9eba06a
commit b166b99eed
2 changed files with 21 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
src/libbpf.c
View File

@@ -7171,11 +7171,17 @@ static struct bpf_object *bpf_object_open(const char *path, const void *obj_buf,
/* non-empty token path can't be combined with invalid token FD */
if (token_path && token_path[0] != '\0' && token_fd < 0)
return ERR_PTR(-EINVAL);
/* empty token path can't be combined with valid token FD */
if (token_path && token_path[0] == '\0' && token_fd > 0)
return ERR_PTR(-EINVAL);
/* if user didn't specify bpf_token_path/bpf_token_fd explicitly,
* check if LIBBPF_BPF_TOKEN_PATH envvar was set and treat it as
* bpf_token_path option
*/
if (token_fd == 0 && !token_path)
token_path = getenv("LIBBPF_BPF_TOKEN_PATH");
/* empty token_path is equivalent to invalid token_fd */
if (token_path && token_path[0] == '\0') {
/* empty token path can't be combined with valid token FD */
if (token_fd > 0)
return ERR_PTR(-EINVAL);
/* empty token_path is equivalent to invalid token_fd */
token_path = NULL;
token_fd = -1;
}