[PATCH] kprobes: no probes on critical path

For Kprobes critical path is the path from debug break exception handler till the control reaches kprobes exception code. No probes can be supported in this path as we will end up in recursion. This patch prevents this by moving the below function to safe __kprobes section onto which no probes can be inserted.

Keshavamurthy Anil S committed 20 years ago

Commit 00d7c051 parent cda315a2 files · +8 −2Browse files

Showing the changes to kernel (1 of 2 files). Show all

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kernel/sys.c+2−1

@@ -32,6 +32,7 @@ · 31 unmodified lines
32	32
33	33	#include <linux/compat.h>
34	34	#include <linux/syscalls.h>
	35	+#include <linux/kprobes.h>
35	36
36	37	#include <asm/uaccess.h>
37	38	#include <asm/io.h>
@@ -168,7 +169,7 @@ EXPORT_SYMBOL(notifier_chain_unregister); · 130 unmodified lines
168	169	* of the last notifier function called.
169	170	*/
170	171
171		−int notifier_call_chain(struct notifier_block *n, unsigned long val, void v)
	172	+int __kprobes notifier_call_chain(struct notifier_block *n, unsigned long val, void v)
172	173	{
173	174	int ret=NOTIFY_DONE;
174	175	struct notifier_block nb = n;