diff mbox series

[PATCHv2,bpf-next,2/9] bpf: Add support for uprobe multi session attach

Message ID 20240701164115.723677-3-jolsa@kernel.org (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series uprobe, bpf: Add session support | expand

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netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1089 this patch: 1089
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netdev/build_clang success Errors and warnings before: 1162 this patch: 1162
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netdev/checkpatch warning WARNING: line length of 81 exceeds 80 columns WARNING: line length of 83 exceeds 80 columns WARNING: line length of 88 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline fail Was 0 now: 2

Commit Message

Jiri Olsa July 1, 2024, 4:41 p.m. UTC 
Adding support to attach bpf program for entry and return probe
of the same function. This is common use case which at the moment
requires to create two uprobe multi links.

Adding new BPF_TRACE_UPROBE_SESSION attach type that instructs
kernel to attach single link program to both entry and exit probe.

It's possible to control execution of the bpf program on return
probe simply by returning zero or non zero from the entry bpf
program execution to execute or not the bpf program on return
probe respectively.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 include/uapi/linux/bpf.h       |  1 +
 kernel/bpf/syscall.c           |  9 +++++++--
 kernel/trace/bpf_trace.c       | 25 +++++++++++++++++++------
 tools/include/uapi/linux/bpf.h |  1 +
 4 files changed, 28 insertions(+), 8 deletions(-)

Comments

Andrii Nakryiko July 2, 2024, 9:30 p.m. UTC | #1 
On Mon, Jul 1, 2024 at 9:42 AM Jiri Olsa <jolsa@kernel.org> wrote:
>
> Adding support to attach bpf program for entry and return probe
> of the same function. This is common use case which at the moment
> requires to create two uprobe multi links.
>
> Adding new BPF_TRACE_UPROBE_SESSION attach type that instructs
> kernel to attach single link program to both entry and exit probe.
>
> It's possible to control execution of the bpf program on return
> probe simply by returning zero or non zero from the entry bpf
> program execution to execute or not the bpf program on return
> probe respectively.
>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
>  include/uapi/linux/bpf.h       |  1 +
>  kernel/bpf/syscall.c           |  9 +++++++--
>  kernel/trace/bpf_trace.c       | 25 +++++++++++++++++++------
>  tools/include/uapi/linux/bpf.h |  1 +
>  4 files changed, 28 insertions(+), 8 deletions(-)
>

LGTM

Acked-by: Andrii Nakryiko <andrii@kernel.org>

> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index 35bcf52dbc65..1d93cb014884 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -1116,6 +1116,7 @@ enum bpf_attach_type {
>         BPF_NETKIT_PRIMARY,
>         BPF_NETKIT_PEER,
>         BPF_TRACE_KPROBE_SESSION,
> +       BPF_TRACE_UPROBE_SESSION,
>         __MAX_BPF_ATTACH_TYPE
>  };
>
> diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
> index 869265852d51..2a63a528fa3c 100644
> --- a/kernel/bpf/syscall.c
> +++ b/kernel/bpf/syscall.c
> @@ -4049,10 +4049,14 @@ static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog,
>                 if (prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI &&
>                     attach_type != BPF_TRACE_UPROBE_MULTI)
>                         return -EINVAL;
> +               if (prog->expected_attach_type == BPF_TRACE_UPROBE_SESSION &&
> +                   attach_type != BPF_TRACE_UPROBE_SESSION)
> +                       return -EINVAL;
>                 if (attach_type != BPF_PERF_EVENT &&
>                     attach_type != BPF_TRACE_KPROBE_MULTI &&
>                     attach_type != BPF_TRACE_KPROBE_SESSION &&
> -                   attach_type != BPF_TRACE_UPROBE_MULTI)
> +                   attach_type != BPF_TRACE_UPROBE_MULTI &&
> +                   attach_type != BPF_TRACE_UPROBE_SESSION)
>                         return -EINVAL;
>                 return 0;
>         case BPF_PROG_TYPE_SCHED_CLS:
> @@ -5315,7 +5319,8 @@ static int link_create(union bpf_attr *attr, bpfptr_t uattr)
>                 else if (attr->link_create.attach_type == BPF_TRACE_KPROBE_MULTI ||
>                          attr->link_create.attach_type == BPF_TRACE_KPROBE_SESSION)
>                         ret = bpf_kprobe_multi_link_attach(attr, prog);
> -               else if (attr->link_create.attach_type == BPF_TRACE_UPROBE_MULTI)
> +               else if (attr->link_create.attach_type == BPF_TRACE_UPROBE_MULTI ||
> +                        attr->link_create.attach_type == BPF_TRACE_UPROBE_SESSION)
>                         ret = bpf_uprobe_multi_link_attach(attr, prog);
>                 break;
>         default:
> diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
> index 02d052639dfe..1b19c1cdb5e1 100644
> --- a/kernel/trace/bpf_trace.c
> +++ b/kernel/trace/bpf_trace.c
> @@ -1645,6 +1645,17 @@ static inline bool is_kprobe_session(const struct bpf_prog *prog)
>         return prog->expected_attach_type == BPF_TRACE_KPROBE_SESSION;
>  }
>
> +static inline bool is_uprobe_multi(const struct bpf_prog *prog)
> +{
> +       return prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI ||
> +              prog->expected_attach_type == BPF_TRACE_UPROBE_SESSION;
> +}
> +
> +static inline bool is_uprobe_session(const struct bpf_prog *prog)
> +{
> +       return prog->expected_attach_type == BPF_TRACE_UPROBE_SESSION;
> +}
> +
>  static const struct bpf_func_proto *
>  kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
>  {
> @@ -1662,13 +1673,13 @@ kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
>         case BPF_FUNC_get_func_ip:
>                 if (is_kprobe_multi(prog))
>                         return &bpf_get_func_ip_proto_kprobe_multi;
> -               if (prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI)
> +               if (is_uprobe_multi(prog))
>                         return &bpf_get_func_ip_proto_uprobe_multi;
>                 return &bpf_get_func_ip_proto_kprobe;
>         case BPF_FUNC_get_attach_cookie:
>                 if (is_kprobe_multi(prog))
>                         return &bpf_get_attach_cookie_proto_kmulti;
> -               if (prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI)
> +               if (is_uprobe_multi(prog))
>                         return &bpf_get_attach_cookie_proto_umulti;
>                 return &bpf_get_attach_cookie_proto_trace;
>         default:
> @@ -3387,7 +3398,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
>         if (sizeof(u64) != sizeof(void *))
>                 return -EOPNOTSUPP;
>
> -       if (prog->expected_attach_type != BPF_TRACE_UPROBE_MULTI)
> +       if (!is_uprobe_multi(prog))
>                 return -EINVAL;
>
>         flags = attr->link_create.uprobe_multi.flags;
> @@ -3463,10 +3474,12 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
>
>                 uprobes[i].link = link;
>
> -               if (flags & BPF_F_UPROBE_MULTI_RETURN)
> -                       uprobes[i].consumer.ret_handler = uprobe_multi_link_ret_handler;
> -               else
> +               if (!(flags & BPF_F_UPROBE_MULTI_RETURN))
>                         uprobes[i].consumer.handler = uprobe_multi_link_handler;
> +               if (flags & BPF_F_UPROBE_MULTI_RETURN || is_uprobe_session(prog))
> +                       uprobes[i].consumer.ret_handler = uprobe_multi_link_ret_handler;
> +               if (is_uprobe_session(prog))
> +                       uprobes[i].consumer.session = true;
>
>                 if (pid)
>                         uprobes[i].consumer.filter = uprobe_multi_link_filter;
> diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
> index 35bcf52dbc65..1d93cb014884 100644
> --- a/tools/include/uapi/linux/bpf.h
> +++ b/tools/include/uapi/linux/bpf.h
> @@ -1116,6 +1116,7 @@ enum bpf_attach_type {
>         BPF_NETKIT_PRIMARY,
>         BPF_NETKIT_PEER,
>         BPF_TRACE_KPROBE_SESSION,
> +       BPF_TRACE_UPROBE_SESSION,
>         __MAX_BPF_ATTACH_TYPE
>  };
>
> --
> 2.45.2
>
diff mbox series

Patch

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 35bcf52dbc65..1d93cb014884 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -1116,6 +1116,7 @@  enum bpf_attach_type {
 	BPF_NETKIT_PRIMARY,
 	BPF_NETKIT_PEER,
 	BPF_TRACE_KPROBE_SESSION,
+	BPF_TRACE_UPROBE_SESSION,
 	__MAX_BPF_ATTACH_TYPE
 };
 
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 869265852d51..2a63a528fa3c 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -4049,10 +4049,14 @@  static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog,
 		if (prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI &&
 		    attach_type != BPF_TRACE_UPROBE_MULTI)
 			return -EINVAL;
+		if (prog->expected_attach_type == BPF_TRACE_UPROBE_SESSION &&
+		    attach_type != BPF_TRACE_UPROBE_SESSION)
+			return -EINVAL;
 		if (attach_type != BPF_PERF_EVENT &&
 		    attach_type != BPF_TRACE_KPROBE_MULTI &&
 		    attach_type != BPF_TRACE_KPROBE_SESSION &&
-		    attach_type != BPF_TRACE_UPROBE_MULTI)
+		    attach_type != BPF_TRACE_UPROBE_MULTI &&
+		    attach_type != BPF_TRACE_UPROBE_SESSION)
 			return -EINVAL;
 		return 0;
 	case BPF_PROG_TYPE_SCHED_CLS:
@@ -5315,7 +5319,8 @@  static int link_create(union bpf_attr *attr, bpfptr_t uattr)
 		else if (attr->link_create.attach_type == BPF_TRACE_KPROBE_MULTI ||
 			 attr->link_create.attach_type == BPF_TRACE_KPROBE_SESSION)
 			ret = bpf_kprobe_multi_link_attach(attr, prog);
-		else if (attr->link_create.attach_type == BPF_TRACE_UPROBE_MULTI)
+		else if (attr->link_create.attach_type == BPF_TRACE_UPROBE_MULTI ||
+			 attr->link_create.attach_type == BPF_TRACE_UPROBE_SESSION)
 			ret = bpf_uprobe_multi_link_attach(attr, prog);
 		break;
 	default:
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 02d052639dfe..1b19c1cdb5e1 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1645,6 +1645,17 @@  static inline bool is_kprobe_session(const struct bpf_prog *prog)
 	return prog->expected_attach_type == BPF_TRACE_KPROBE_SESSION;
 }
 
+static inline bool is_uprobe_multi(const struct bpf_prog *prog)
+{
+	return prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI ||
+	       prog->expected_attach_type == BPF_TRACE_UPROBE_SESSION;
+}
+
+static inline bool is_uprobe_session(const struct bpf_prog *prog)
+{
+	return prog->expected_attach_type == BPF_TRACE_UPROBE_SESSION;
+}
+
 static const struct bpf_func_proto *
 kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 {
@@ -1662,13 +1673,13 @@  kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 	case BPF_FUNC_get_func_ip:
 		if (is_kprobe_multi(prog))
 			return &bpf_get_func_ip_proto_kprobe_multi;
-		if (prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI)
+		if (is_uprobe_multi(prog))
 			return &bpf_get_func_ip_proto_uprobe_multi;
 		return &bpf_get_func_ip_proto_kprobe;
 	case BPF_FUNC_get_attach_cookie:
 		if (is_kprobe_multi(prog))
 			return &bpf_get_attach_cookie_proto_kmulti;
-		if (prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI)
+		if (is_uprobe_multi(prog))
 			return &bpf_get_attach_cookie_proto_umulti;
 		return &bpf_get_attach_cookie_proto_trace;
 	default:
@@ -3387,7 +3398,7 @@  int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
 	if (sizeof(u64) != sizeof(void *))
 		return -EOPNOTSUPP;
 
-	if (prog->expected_attach_type != BPF_TRACE_UPROBE_MULTI)
+	if (!is_uprobe_multi(prog))
 		return -EINVAL;
 
 	flags = attr->link_create.uprobe_multi.flags;
@@ -3463,10 +3474,12 @@  int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
 
 		uprobes[i].link = link;
 
-		if (flags & BPF_F_UPROBE_MULTI_RETURN)
-			uprobes[i].consumer.ret_handler = uprobe_multi_link_ret_handler;
-		else
+		if (!(flags & BPF_F_UPROBE_MULTI_RETURN))
 			uprobes[i].consumer.handler = uprobe_multi_link_handler;
+		if (flags & BPF_F_UPROBE_MULTI_RETURN || is_uprobe_session(prog))
+			uprobes[i].consumer.ret_handler = uprobe_multi_link_ret_handler;
+		if (is_uprobe_session(prog))
+			uprobes[i].consumer.session = true;
 
 		if (pid)
 			uprobes[i].consumer.filter = uprobe_multi_link_filter;
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 35bcf52dbc65..1d93cb014884 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -1116,6 +1116,7 @@  enum bpf_attach_type {
 	BPF_NETKIT_PRIMARY,
 	BPF_NETKIT_PEER,
 	BPF_TRACE_KPROBE_SESSION,
+	BPF_TRACE_UPROBE_SESSION,
 	__MAX_BPF_ATTACH_TYPE
 };