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libbpf: Deprecate bpf_objects_list

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Add a flag to `enum libbpf_strict_mode' to disable the global
`bpf_objects_list', preventing race conditions when concurrent threads
call bpf_object__open() or bpf_object__close().

bpf_object__next() will return NULL if this option is set.

Callers may achieve the same workflow by tracking bpf_objects in
application code.

  [0] Closes: https://github.com/libbpf/libbpf/issues/293

Signed-off-by: Joe Burton <jevburton@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211026223528.413950-1-jevburton.kernel@gmail.com
This commit is contained in:
Joe Burton 2021-10-26 22:35:28 +00:00 • committed by Andrii Nakryiko
parent 20d1b54a52
commit 689624f037
3 changed files with 15 additions and 2 deletions
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8
tools/lib/bpf/libbpf.c
View file

@ -1148,6 +1148,7 @@ static struct bpf_object *bpf_object__new(const char *path,
size_t obj_buf_sz,
const char *obj_name)
{
bool strict = (libbpf_mode & LIBBPF_STRICT_NO_OBJECT_LIST);
struct bpf_object *obj;
char *end;
@ -1188,7 +1189,8 @@ static struct bpf_object *bpf_object__new(const char *path,
obj->loaded = false;
INIT_LIST_HEAD(&obj->list);
list_add(&obj->list, &bpf_objects_list);
if (!strict)
list_add(&obj->list, &bpf_objects_list);
return obj;
}
@ -7935,6 +7937,10 @@ struct bpf_object *
bpf_object__next(struct bpf_object *prev)
{
struct bpf_object *next;
bool strict = (libbpf_mode & LIBBPF_STRICT_NO_OBJECT_LIST);
if (strict)
return NULL;
if (!prev)
next = list_first_entry(&bpf_objects_list,