linux-kernel - [PATCH v2 bpf-next 1/2] libbpf: Fix usdt

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Date:   Tue, 19 Apr 2022 22:52:37 +0800
From:   Pu Lehui <pulehui@...wei.com>
To:     <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-riscv@...ts.infradead.org>
CC:     <andrii@...nel.org>, <ast@...nel.org>, <daniel@...earbox.net>,
        <kafai@...com>, <songliubraving@...com>, <yhs@...com>,
        <john.fastabend@...il.com>, <kpsingh@...nel.org>,
        <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>, <pulehui@...wei.com>
Subject: [PATCH v2 bpf-next 1/2] libbpf: Fix usdt_cookie being cast to 32 bits

The usdt_cookie is defined as __u64, which should not be
used as a long type because it will be cast to 32 bits
in 32-bit platforms.

Signed-off-by: Pu Lehui <pulehui@...wei.com>
---
 tools/lib/bpf/libbpf.c          | 2 +-
 tools/lib/bpf/libbpf_internal.h | 2 +-
 tools/lib/bpf/usdt.c            | 8 ++++----
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index bf4f7ac54..33d21ed7c 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -10982,7 +10982,7 @@ struct bpf_link *bpf_program__attach_usdt(const struct bpf_program *prog,
 	char resolved_path[512];
 	struct bpf_object *obj = prog->obj;
 	struct bpf_link *link;
-	long usdt_cookie;
+	__u64 usdt_cookie;
 	int err;
 
 	if (!OPTS_VALID(opts, bpf_uprobe_opts))
diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
index 080272421..054cd8e93 100644
--- a/tools/lib/bpf/libbpf_internal.h
+++ b/tools/lib/bpf/libbpf_internal.h
@@ -571,6 +571,6 @@ struct bpf_link * usdt_manager_attach_usdt(struct usdt_manager *man,
 					   const struct bpf_program *prog,
 					   pid_t pid, const char *path,
 					   const char *usdt_provider, const char *usdt_name,
-					   long usdt_cookie);
+					   __u64 usdt_cookie);
 
 #endif /* __LIBBPF_LIBBPF_INTERNAL_H */
diff --git a/tools/lib/bpf/usdt.c b/tools/lib/bpf/usdt.c
index 934c25301..8e77a7260 100644
--- a/tools/lib/bpf/usdt.c
+++ b/tools/lib/bpf/usdt.c
@@ -557,10 +557,10 @@ static int parse_usdt_note(Elf *elf, const char *path, long base_addr,
 			   GElf_Nhdr *nhdr, const char *data, size_t name_off, size_t desc_off,
 			   struct usdt_note *usdt_note);
 
-static int parse_usdt_spec(struct usdt_spec *spec, const struct usdt_note *note, long usdt_cookie);
+static int parse_usdt_spec(struct usdt_spec *spec, const struct usdt_note *note, __u64 usdt_cookie);
 
 static int collect_usdt_targets(struct usdt_manager *man, Elf *elf, const char *path, pid_t pid,
-				const char *usdt_provider, const char *usdt_name, long usdt_cookie,
+				const char *usdt_provider, const char *usdt_name, __u64 usdt_cookie,
 				struct usdt_target **out_targets, size_t *out_target_cnt)
 {
 	size_t off, name_off, desc_off, seg_cnt = 0, lib_seg_cnt = 0, target_cnt = 0;
@@ -939,7 +939,7 @@ static int allocate_spec_id(struct usdt_manager *man, struct hashmap *specs_hash
 struct bpf_link *usdt_manager_attach_usdt(struct usdt_manager *man, const struct bpf_program *prog,
 					  pid_t pid, const char *path,
 					  const char *usdt_provider, const char *usdt_name,
-					  long usdt_cookie)
+					  __u64 usdt_cookie)
 {
 	int i, fd, err, spec_map_fd, ip_map_fd;
 	LIBBPF_OPTS(bpf_uprobe_opts, opts);
@@ -1141,7 +1141,7 @@ static int parse_usdt_note(Elf *elf, const char *path, long base_addr,
 
 static int parse_usdt_arg(const char *arg_str, int arg_num, struct usdt_arg_spec *arg);
 
-static int parse_usdt_spec(struct usdt_spec *spec, const struct usdt_note *note, long usdt_cookie)
+static int parse_usdt_spec(struct usdt_spec *spec, const struct usdt_note *note, __u64 usdt_cookie)
 {
 	const char *s;
 	int len;
-- 
2.25.1