From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, Martin KaFai Lau <kafai@fb.com>,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Yafang Shao <laoar.shao@gmail.com>
Subject: [PATCH bpf-next 2/6] bpf: Store ref_ctr_offsets values in bpf_uprobe array
Date: Wed, 25 Oct 2023 22:24:16 +0200 [thread overview]
Message-ID: <20231025202420.390702-3-jolsa@kernel.org> (raw)
In-Reply-To: <20231025202420.390702-1-jolsa@kernel.org>
We will need to return ref_ctr_offsets values through link_info
interface in following change, so we need to keep them around.
Storing ref_ctr_offsets values directly into bpf_uprobe array.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
kernel/trace/bpf_trace.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index df697c74d519..843b3846d3f8 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -3031,6 +3031,7 @@ struct bpf_uprobe_multi_link;
struct bpf_uprobe {
struct bpf_uprobe_multi_link *link;
loff_t offset;
+ unsigned long ref_ctr_offset;
u64 cookie;
struct uprobe_consumer consumer;
};
@@ -3170,7 +3171,6 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
{
struct bpf_uprobe_multi_link *link = NULL;
unsigned long __user *uref_ctr_offsets;
- unsigned long *ref_ctr_offsets = NULL;
struct bpf_link_primer link_primer;
struct bpf_uprobe *uprobes = NULL;
struct task_struct *task = NULL;
@@ -3243,18 +3243,12 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
if (!uprobes || !link)
goto error_free;
- if (uref_ctr_offsets) {
- ref_ctr_offsets = kvcalloc(cnt, sizeof(*ref_ctr_offsets), GFP_KERNEL);
- if (!ref_ctr_offsets)
- goto error_free;
- }
-
for (i = 0; i < cnt; i++) {
if (ucookies && __get_user(uprobes[i].cookie, ucookies + i)) {
err = -EFAULT;
goto error_free;
}
- if (uref_ctr_offsets && __get_user(ref_ctr_offsets[i], uref_ctr_offsets + i)) {
+ if (uref_ctr_offsets && __get_user(uprobes[i].ref_ctr_offset, uref_ctr_offsets + i)) {
err = -EFAULT;
goto error_free;
}
@@ -3285,7 +3279,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
for (i = 0; i < cnt; i++) {
err = uprobe_register_refctr(d_real_inode(link->path.dentry),
uprobes[i].offset,
- ref_ctr_offsets ? ref_ctr_offsets[i] : 0,
+ uprobes[i].ref_ctr_offset,
&uprobes[i].consumer);
if (err) {
bpf_uprobe_unregister(&path, uprobes, i);
@@ -3297,11 +3291,9 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
if (err)
goto error_free;
- kvfree(ref_ctr_offsets);
return bpf_link_settle(&link_primer);
error_free:
- kvfree(ref_ctr_offsets);
kvfree(uprobes);
kfree(link);
if (task)
--
2.41.0
next prev parent reply other threads:[~2023-10-25 20:24 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-25 20:24 [PATCH bpf-next 0/6] bpf: Add link_info support for uprobe multi link Jiri Olsa
2023-10-25 20:24 ` [PATCH bpf-next 1/6] libbpf: Add st_type argument to elf_resolve_syms_offsets function Jiri Olsa
2023-10-26 16:29 ` Song Liu
2023-10-25 20:24 ` Jiri Olsa [this message]
2023-10-26 16:31 ` [PATCH bpf-next 2/6] bpf: Store ref_ctr_offsets values in bpf_uprobe array Song Liu
2023-10-27 13:56 ` Jiri Olsa
2023-10-27 14:23 ` Song Liu
2023-11-01 22:21 ` Andrii Nakryiko
2023-10-25 20:24 ` [PATCH bpf-next 3/6] bpf: Add link_info support for uprobe multi link Jiri Olsa
2023-10-26 11:57 ` Yafang Shao
2023-10-27 13:59 ` Jiri Olsa
2023-11-09 8:56 ` Jiri Olsa
2023-10-26 17:55 ` Song Liu
2023-10-27 14:29 ` Jiri Olsa
2023-11-01 22:21 ` Andrii Nakryiko
2023-11-02 14:58 ` Jiri Olsa
2023-11-02 16:21 ` Andrii Nakryiko
2023-10-30 10:18 ` Quentin Monnet
2023-10-30 21:17 ` Jiri Olsa
2023-11-01 22:21 ` Andrii Nakryiko
2023-11-02 14:43 ` Jiri Olsa
2023-11-02 16:19 ` Andrii Nakryiko
2023-10-25 20:24 ` [PATCH bpf-next 4/6] selftests/bpf: Use bpf_link__destroy in fill_link_info tests Jiri Olsa
2023-10-26 11:41 ` Yafang Shao
2023-10-26 18:00 ` Song Liu
2023-11-01 22:24 ` Andrii Nakryiko
2023-11-02 14:12 ` Jiri Olsa
2023-10-25 20:24 ` [PATCH bpf-next 5/6] selftests/bpf: Add link_info test for uprobe_multi link Jiri Olsa
2023-10-26 18:13 ` Song Liu
2023-11-01 22:27 ` Andrii Nakryiko
2023-10-25 20:24 ` [PATCH bpf-next 6/6] bpftool: Add support to display uprobe_multi links Jiri Olsa
2023-10-26 18:27 ` Song Liu
2023-10-30 10:17 ` Quentin Monnet
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