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samples/kprobes: Add __kprobes and NOKPROBE_SYMBOL() for handlers.

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Add __kprobes and NOKPROBE_SYMBOL() for sample kprobe handlers.

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/20200505134059.878578033@linutronix.de
This commit is contained in:
Masami Hiramatsu
2020-03-26 23:50:11 +09:00
committed by Thomas Gleixner
parent 16db6264c9
commit d85eaa9411
2 changed files with 6 additions and 2 deletions
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6
samples/kprobes/kprobe_example.c
View File

@@ -25,7 +25,7 @@ static struct kprobe kp = {
}; };
/* kprobe pre_handler: called just before the probed instruction is executed */ /* kprobe pre_handler: called just before the probed instruction is executed */
static int handler_pre(struct kprobe *p, struct pt_regs *regs) static int __kprobes handler_pre(struct kprobe *p, struct pt_regs *regs)
{ {
#ifdef CONFIG_X86 #ifdef CONFIG_X86
pr_info("<%s> pre_handler: p->addr = 0x%p, ip = %lx, flags = 0x%lx\n", pr_info("<%s> pre_handler: p->addr = 0x%p, ip = %lx, flags = 0x%lx\n",
@@ -54,7 +54,7 @@ static int handler_pre(struct kprobe *p, struct pt_regs *regs)
} }
/* kprobe post_handler: called after the probed instruction is executed */ /* kprobe post_handler: called after the probed instruction is executed */
static void handler_post(struct kprobe *p, struct pt_regs *regs, static void __kprobes handler_post(struct kprobe *p, struct pt_regs *regs,
unsigned long flags) unsigned long flags)
{ {
#ifdef CONFIG_X86 #ifdef CONFIG_X86
@@ -90,6 +90,8 @@ static int handler_fault(struct kprobe *p, struct pt_regs *regs, int trapnr)
/* Return 0 because we don't handle the fault. */ /* Return 0 because we don't handle the fault. */
return 0; return 0;
} }
/* NOKPROBE_SYMBOL() is also available */
NOKPROBE_SYMBOL(handler_fault);
static int __init kprobe_init(void) static int __init kprobe_init(void)
{ {

2
samples/kprobes/kretprobe_example.c
View File

@@ -48,6 +48,7 @@ static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
data->entry_stamp = ktime_get(); data->entry_stamp = ktime_get();
return 0; return 0;
} }
NOKPROBE_SYMBOL(entry_handler);
/* /*
* Return-probe handler: Log the return value and duration. Duration may turn * Return-probe handler: Log the return value and duration. Duration may turn
@@ -67,6 +68,7 @@ static int ret_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
func_name, retval, (long long)delta); func_name, retval, (long long)delta);
return 0; return 0;
} }
NOKPROBE_SYMBOL(ret_handler);
static struct kretprobe my_kretprobe = { static struct kretprobe my_kretprobe = {
.handler = ret_handler, .handler = ret_handler,