mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
406c557edc
Add recursive non-sleepable fentry program as a test. All attach points where sleepable progs can execute are non recursive so far. The recursion protection mechanism for sleepable cannot be activated yet. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210210033634.62081-6-alexei.starovoitov@gmail.com
46 lines
855 B
C
46 lines
855 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (c) 2021 Facebook */
|
|
|
|
#include "vmlinux.h"
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_HASH);
|
|
__uint(max_entries, 1);
|
|
__type(key, int);
|
|
__type(value, long);
|
|
} hash1 SEC(".maps");
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_HASH);
|
|
__uint(max_entries, 1);
|
|
__type(key, int);
|
|
__type(value, long);
|
|
} hash2 SEC(".maps");
|
|
|
|
int pass1 = 0;
|
|
int pass2 = 0;
|
|
|
|
SEC("fentry/__htab_map_lookup_elem")
|
|
int BPF_PROG(on_lookup, struct bpf_map *map)
|
|
{
|
|
int key = 0;
|
|
|
|
if (map == (void *)&hash1) {
|
|
pass1++;
|
|
return 0;
|
|
}
|
|
if (map == (void *)&hash2) {
|
|
pass2++;
|
|
/* htab_map_gen_lookup() will inline below call
|
|
* into direct call to __htab_map_lookup_elem()
|
|
*/
|
|
bpf_map_lookup_elem(&hash2, &key);
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|