netdev - [PATCH v6 bpf-next 07/11] tracepoint: introduce kernel_tracepoint_find_by

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180327024706.2064725-8-ast@fb.com>
Date:   Mon, 26 Mar 2018 19:47:02 -0700
From:   Alexei Starovoitov <ast@...com>
To:     <davem@...emloft.net>
CC:     <daniel@...earbox.net>, <torvalds@...ux-foundation.org>,
        <peterz@...radead.org>, <rostedt@...dmis.org>,
        <netdev@...r.kernel.org>, <kernel-team@...com>,
        <linux-api@...r.kernel.org>
Subject: [PATCH v6 bpf-next 07/11] tracepoint: introduce kernel_tracepoint_find_by_name

From: Alexei Starovoitov <ast@...nel.org>

introduce kernel_tracepoint_find_by_name() helper to let bpf core
find tracepoint by name and later attach bpf probe to a tracepoint

Signed-off-by: Alexei Starovoitov <ast@...nel.org>
---
 include/linux/tracepoint.h | 6 ++++++
 kernel/tracepoint.c        | 9 +++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index c92f4adbc0d7..a00b84473211 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -43,6 +43,12 @@ tracepoint_probe_unregister(struct tracepoint *tp, void *probe, void *data);
 extern void
 for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
 		void *priv);
+#ifdef CONFIG_TRACEPOINTS
+struct tracepoint *kernel_tracepoint_find_by_name(const char *name);
+#else
+static inline struct tracepoint *
+kernel_tracepoint_find_by_name(const char *name) { return NULL; }
+#endif
 
 #ifdef CONFIG_MODULES
 struct tp_module {
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index 671b13457387..e2a9a0391ae2 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -528,6 +528,15 @@ void for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
 }
 EXPORT_SYMBOL_GPL(for_each_kernel_tracepoint);
 
+struct tracepoint *kernel_tracepoint_find_by_name(const char *name)
+{
+	struct tracepoint * const *tp = __start___tracepoints_ptrs;
+
+	for (; tp < __stop___tracepoints_ptrs; tp++)
+		if (!strcmp((*tp)->name, name))
+			return *tp;
+	return NULL;
+}
 #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
 
 /* NB: reg/unreg are called while guarded with the tracepoints_mutex */
-- 
2.9.5