linux-kernel - [PATCH v4 3.0-rc2-tip 15/22] 15: uprobes: register a notifier for uprobes.

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Date:	Tue, 07 Jun 2011 18:31:11 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andi Kleen <andi@...stfloor.org>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH v4 3.0-rc2-tip 15/22] 15: uprobes: register a notifier for uprobes.


Uprobe needs to be intimated on int3 and singlestep exceptions.
Hence uprobes registers a die notifier so that its notified of the events.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
---
 kernel/uprobes.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/kernel/uprobes.c b/kernel/uprobes.c
index 1e88d64..95c16dd 100644
--- a/kernel/uprobes.c
+++ b/kernel/uprobes.c
@@ -36,6 +36,7 @@
 #include <linux/mman.h>	/* needed for PROT_EXEC, MAP_PRIVATE */
 #include <linux/file.h> /* needed for fput() */
 #include <linux/init_task.h> /* init_cred */
+#include <linux/kdebug.h> /* for notifier mechanism */
 
 #define UINSNS_PER_PAGE	(PAGE_SIZE/UPROBES_XOL_SLOT_BYTES)
 #define MAX_UPROBES_XOL_SLOTS UINSNS_PER_PAGE
@@ -1456,3 +1457,20 @@ int uprobe_post_notifier(struct pt_regs *regs)
 	set_thread_flag(TIF_UPROBE);
 	return 1;
 }
+
+struct notifier_block uprobe_exception_nb = {
+	.notifier_call = uprobe_exception_notify,
+	.priority = INT_MAX - 1,	/* notified after kprobes, kgdb */
+};
+
+static int __init init_uprobes(void)
+{
+	return register_die_notifier(&uprobe_exception_nb);
+}
+
+static void __exit exit_uprobes(void)
+{
+}
+
+module_init(init_uprobes);
+module_exit(exit_uprobes);
--
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