diff options
| author | Matt Mullins <mmullins@fb.com> | 2018-12-12 16:42:37 -0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-12-18 14:08:12 -0800 |
| commit | a38d1107f937ca95dcf820161ef44ea683d6a0b1 (patch) | |
| tree | 6fe1371db87f368a635d6d4aa7ef58031a940cf7 /kernel/bpf/syscall.c | |
| parent | a137401d85129953a1713d443216eb6b1074c12e (diff) | |
| download | lwn-a38d1107f937ca95dcf820161ef44ea683d6a0b1.tar.gz lwn-a38d1107f937ca95dcf820161ef44ea683d6a0b1.zip | |
bpf: support raw tracepoints in modules
Distributions build drivers as modules, including network and filesystem
drivers which export numerous tracepoints. This enables
bpf(BPF_RAW_TRACEPOINT_OPEN) to attach to those tracepoints.
Signed-off-by: Matt Mullins <mmullins@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf/syscall.c')
| -rw-r--r-- | kernel/bpf/syscall.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 5db31067d85e..0607db304def 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1604,6 +1604,7 @@ static int bpf_raw_tracepoint_release(struct inode *inode, struct file *filp) bpf_probe_unregister(raw_tp->btp, raw_tp->prog); bpf_prog_put(raw_tp->prog); } + bpf_put_raw_tracepoint(raw_tp->btp); kfree(raw_tp); return 0; } @@ -1629,13 +1630,15 @@ static int bpf_raw_tracepoint_open(const union bpf_attr *attr) return -EFAULT; tp_name[sizeof(tp_name) - 1] = 0; - btp = bpf_find_raw_tracepoint(tp_name); + btp = bpf_get_raw_tracepoint(tp_name); if (!btp) return -ENOENT; raw_tp = kzalloc(sizeof(*raw_tp), GFP_USER); - if (!raw_tp) - return -ENOMEM; + if (!raw_tp) { + err = -ENOMEM; + goto out_put_btp; + } raw_tp->btp = btp; prog = bpf_prog_get_type(attr->raw_tracepoint.prog_fd, @@ -1663,6 +1666,8 @@ out_put_prog: bpf_prog_put(prog); out_free_tp: kfree(raw_tp); +out_put_btp: + bpf_put_raw_tracepoint(btp); return err; } |