diff options
| -rw-r--r-- | kernel/bpf/syscall.c | 70 |
1 files changed, 47 insertions, 23 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index b56c482c9760..523e3ac15a08 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1816,17 +1816,52 @@ 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]; + const char *tp_name; + char buf[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; + if (CHECK_ATTR(BPF_RAW_TRACEPOINT_OPEN)) + return -EINVAL; + + prog = bpf_prog_get(attr->raw_tracepoint.prog_fd); + if (IS_ERR(prog)) + return PTR_ERR(prog); + + if (prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT && + prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE) { + err = -EINVAL; + goto out_put_prog; + } + + if (prog->type == BPF_PROG_TYPE_RAW_TRACEPOINT && + prog->aux->attach_btf_id) { + if (attr->raw_tracepoint.name) { + /* raw_tp name should not be specified in raw_tp + * programs that were verified via in-kernel BTF info + */ + err = -EINVAL; + goto out_put_prog; + } + /* raw_tp name is taken from type name instead */ + tp_name = kernel_type_name(prog->aux->attach_btf_id); + /* skip the prefix */ + tp_name += sizeof("btf_trace_") - 1; + } else { + if (strncpy_from_user(buf, + u64_to_user_ptr(attr->raw_tracepoint.name), + sizeof(buf) - 1) < 0) { + err = -EFAULT; + goto out_put_prog; + } + buf[sizeof(buf) - 1] = 0; + tp_name = buf; + } btp = bpf_get_raw_tracepoint(tp_name); - if (!btp) - return -ENOENT; + if (!btp) { + err = -ENOENT; + goto out_put_prog; + } raw_tp = kzalloc(sizeof(*raw_tp), GFP_USER); if (!raw_tp) { @@ -1834,38 +1869,27 @@ static int bpf_raw_tracepoint_open(const union bpf_attr *attr) goto out_put_btp; } raw_tp->btp = btp; - - prog = bpf_prog_get(attr->raw_tracepoint.prog_fd); - if (IS_ERR(prog)) { - err = PTR_ERR(prog); - goto out_free_tp; - } - if (prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT && - prog->type != BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE) { - err = -EINVAL; - goto out_put_prog; - } + raw_tp->prog = prog; err = bpf_probe_register(raw_tp->btp, prog); if (err) - goto out_put_prog; + goto out_free_tp; - 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; + goto out_free_tp; } return tp_fd; -out_put_prog: - bpf_prog_put(prog); out_free_tp: kfree(raw_tp); out_put_btp: bpf_put_raw_tracepoint(btp); +out_put_prog: + bpf_prog_put(prog); return err; } |