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authorMasami Hiramatsu <mhiramat@kernel.org>2020-03-26 23:50:00 +0900
committerThomas Gleixner <tglx@linutronix.de>2020-05-12 17:15:32 +0200
commit16db6264c93d2d7df9eb8be5d9eb717ab30105fe (patch)
tree5276739d63b183b27c6b6a6a07af9be91ed4730b /kernel/kprobes.c
parent1e6769b0aece51ea7a3dc3117c37d4a5669e4a21 (diff)
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@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200505134059.771170126@linutronix.de
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index b7549992b9bd..9eb5acf0a9f3 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) {