diff options
Diffstat (limited to 'kernel/bpf/syscall.c')
| -rw-r--r-- | kernel/bpf/syscall.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 77d45bd9f507..95ca2523fa6e 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1315,6 +1315,81 @@ static int bpf_obj_get(const union bpf_attr *attr) attr->file_flags); } +struct bpf_raw_tracepoint { + struct bpf_raw_event_map *btp; + struct bpf_prog *prog; +}; + +static int bpf_raw_tracepoint_release(struct inode *inode, struct file *filp) +{ + struct bpf_raw_tracepoint *raw_tp = filp->private_data; + + if (raw_tp->prog) { + bpf_probe_unregister(raw_tp->btp, raw_tp->prog); + bpf_prog_put(raw_tp->prog); + } + kfree(raw_tp); + return 0; +} + +static const struct file_operations bpf_raw_tp_fops = { + .release = bpf_raw_tracepoint_release, + .read = bpf_dummy_read, + .write = bpf_dummy_write, +}; + +#define BPF_RAW_TRACEPOINT_OPEN_LAST_FIELD raw_tracepoint.prog_fd + +static int bpf_raw_tracepoint_open(const union bpf_attr *attr) +{ + struct bpf_raw_tracepoint *raw_tp; + struct bpf_raw_event_map *btp; + struct bpf_prog *prog; + char tp_name[128]; + int tp_fd, err; + + if (strncpy_from_user(tp_name, u64_to_user_ptr(attr->raw_tracepoint.name), + sizeof(tp_name) - 1) < 0) + return -EFAULT; + tp_name[sizeof(tp_name) - 1] = 0; + + btp = bpf_find_raw_tracepoint(tp_name); + if (!btp) + return -ENOENT; + + raw_tp = kzalloc(sizeof(*raw_tp), GFP_USER); + if (!raw_tp) + return -ENOMEM; + raw_tp->btp = btp; + + prog = bpf_prog_get_type(attr->raw_tracepoint.prog_fd, + BPF_PROG_TYPE_RAW_TRACEPOINT); + if (IS_ERR(prog)) { + err = PTR_ERR(prog); + goto out_free_tp; + } + + err = bpf_probe_register(raw_tp->btp, prog); + if (err) + goto out_put_prog; + + raw_tp->prog = prog; + tp_fd = anon_inode_getfd("bpf-raw-tracepoint", &bpf_raw_tp_fops, raw_tp, + O_CLOEXEC); + if (tp_fd < 0) { + bpf_probe_unregister(raw_tp->btp, prog); + err = tp_fd; + goto out_put_prog; + } + return tp_fd; + +out_put_prog: + bpf_prog_put(prog); +out_free_tp: + kfree(raw_tp); + return err; +} + #ifdef CONFIG_CGROUP_BPF #define BPF_PROG_ATTACH_LAST_FIELD attach_flags @@ -1925,6 +2000,9 @@ SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, siz case BPF_OBJ_GET_INFO_BY_FD: err = bpf_obj_get_info_by_fd(&attr, uattr); break; + case BPF_RAW_TRACEPOINT_OPEN: + err = bpf_raw_tracepoint_open(&attr); + break; default: err = -EINVAL; break; |