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Message-ID: <158929673850.390.3433747204484607858.tip-bot2@tip-bot2>
Date: Tue, 12 May 2020 15:18:58 -0000
From: "tip-bot2 for Masami Hiramatsu" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Alexandre Chartre <alexandre.chartre@...cle.com>,
Peter Zijlstra <peterz@...radead.org>, x86 <x86@...nel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: [tip: core/kprobes] kprobes: Support NOKPROBE_SYMBOL() in modules
The following commit has been merged into the core/kprobes branch of tip:
Commit-ID: 16db6264c93d2d7df9eb8be5d9eb717ab30105fe
Gitweb: https://git.kernel.org/tip/16db6264c93d2d7df9eb8be5d9eb717ab30105fe
Author: Masami Hiramatsu <mhiramat@...nel.org>
AuthorDate: Thu, 26 Mar 2020 23:50:00 +09:00
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 12 May 2020 17:15:32 +02:00
kprobes: Support NOKPROBE_SYMBOL() in modules
Support NOKPROBE_SYMBOL() in modules. NOKPROBE_SYMBOL() records only symbol
address in "_kprobe_blacklist" section in the module.
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20200505134059.771170126@linutronix.de
---
include/linux/module.h | 2 ++
kernel/kprobes.c | 17 +++++++++++++++++
kernel/module.c | 3 +++
3 files changed, 22 insertions(+)
diff --git a/include/linux/module.h b/include/linux/module.h
index 369c354..1192097 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -492,6 +492,8 @@ struct module {
#ifdef CONFIG_KPROBES
void *kprobes_text_start;
unsigned int kprobes_text_size;
+ unsigned long *kprobe_blacklist;
+ unsigned int num_kprobe_blacklist;
#endif
#ifdef CONFIG_LIVEPATCH
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index b754999..9eb5acf 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -2192,6 +2192,11 @@ static void kprobe_remove_area_blacklist(unsigned long start, unsigned long end)
}
}
+static void kprobe_remove_ksym_blacklist(unsigned long entry)
+{
+ kprobe_remove_area_blacklist(entry, entry + 1);
+}
+
int __init __weak arch_populate_kprobe_blacklist(void)
{
return 0;
@@ -2231,6 +2236,12 @@ static int __init populate_kprobe_blacklist(unsigned long *start,
static void add_module_kprobe_blacklist(struct module *mod)
{
unsigned long start, end;
+ int i;
+
+ if (mod->kprobe_blacklist) {
+ for (i = 0; i < mod->num_kprobe_blacklist; i++)
+ kprobe_add_ksym_blacklist(mod->kprobe_blacklist[i]);
+ }
start = (unsigned long)mod->kprobes_text_start;
if (start) {
@@ -2242,6 +2253,12 @@ static void add_module_kprobe_blacklist(struct module *mod)
static void remove_module_kprobe_blacklist(struct module *mod)
{
unsigned long start, end;
+ int i;
+
+ if (mod->kprobe_blacklist) {
+ for (i = 0; i < mod->num_kprobe_blacklist; i++)
+ kprobe_remove_ksym_blacklist(mod->kprobe_blacklist[i]);
+ }
start = (unsigned long)mod->kprobes_text_start;
if (start) {
diff --git a/kernel/module.c b/kernel/module.c
index 978f3fa..faf7337 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3197,6 +3197,9 @@ static int find_module_sections(struct module *mod, struct load_info *info)
#ifdef CONFIG_KPROBES
mod->kprobes_text_start = section_objs(info, ".kprobes.text", 1,
&mod->kprobes_text_size);
+ mod->kprobe_blacklist = section_objs(info, "_kprobe_blacklist",
+ sizeof(unsigned long),
+ &mod->num_kprobe_blacklist);
#endif
mod->extable = section_objs(info, "__ex_table",
sizeof(*mod->extable), &mod->num_exentries);
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