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bpf: Attach raw_tp program with BTF via type name 

BTF type id specified at program load time has all
necessary information to attach that program to raw tracepoint.
Use kernel type name to find raw tracepoint.

Add missing CHECK_ATTR() condition.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20191016032505.2089704-8-ast@kernel.org
This commit is contained in:
Alexei Starovoitov 2019-10-15 20:25:01 -07:00 committed by Daniel Borkmann
parent 9e15db6613
commit ac4414b5ca
1 changed files with 47 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
kernel/bpf/syscall.c
View File

@ -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;
}