+ kprobes-support-probing-module-__exit-function-fix-2.patch added to -mm tree

+ kprobes-support-probing-module-__exit-function-fix-2.patch added to -mm tree

[akpm]

The patch titled
     bugfix: pass aggr_kprobe to arch_remove_kprobe
has been added to the -mm tree.  Its filename is
     kprobes-support-probing-module-__exit-function-fix-2.patch

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*** Remember to use Documentation/SubmitChecklist when testing your code ***

See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this

The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/

------------------------------------------------------
Subject: bugfix: pass aggr_kprobe to arch_remove_kprobe
From: Masami Hiramatsu <mhiramat@redhat.com>

akpm@linux-foundation.org wrote:
> The patch titled
>      kprobes: support probing module __exit function
> has been added to the -mm tree.  Its filename is
>      kprobes-support-probing-module-__exit-function.patch

Call arch_remove_kprobe() with aggr_kprobe instead of user specific kprobe,
because the user specific kprobe on the gone or reused aggr_kprobe may have
invalid arch_specific_insn.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/kprobes.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff -puN kernel/kprobes.c~kprobes-support-probing-module-__exit-function-fix-2 kernel/kprobes.c
--- a/kernel/kprobes.c~kprobes-support-probing-module-__exit-function-fix-2
+++ a/kernel/kprobes.c
@@ -762,14 +762,14 @@ static void __kprobes __unregister_kprob
 {
 	struct kprobe *old_p;
 
-	if (list_empty(&p->list) || list_is_singular(&p->list)) {
-		if (!list_empty(&p->list)) {
-			/* "p" is the last child of an aggr_kprobe */
-			old_p = list_entry(p->list.next, struct kprobe, list);
-			list_del(&p->list);
-			kfree(old_p);
-		}
+	if (list_empty(&p->list))
 		arch_remove_kprobe(p);
+	else if (list_is_singular(&p->list)) {
+		/* "p" is the last child of an aggr_kprobe */
+		old_p = list_entry(p->list.next, struct kprobe, list);
+		list_del(&p->list);
+		arch_remove_kprobe(old_p);
+		kfree(old_p);
 	}
 }
 
_

Patches currently in -mm which might be from mhiramat@redhat.com are

kprobes-bugfix-try_module_get-even-if-calling_mod-is-null.patch
kprobes-indirectly-call-kprobe_target.patch
kprobes-add-tests-for-register_kprobes.patch
module-add-within_module_core-and-within_module_init.patch
kprobes-add-kprobe_insn_mutex-and-cleanup-arch_remove_kprobe.patch
kprobes-add-__kprobes-to-kprobe-internal-functions.patch
kprobes-support-probing-module-__exit-function.patch
kprobes-support-probing-module-__exit-function-fix.patch
kprobes-support-probing-module-__exit-function-fix-2.patch
kprobes-remove-called_from-argument.patch
kprobes-remove-called_from-argument-fix.patch
module-add-module_state_live-notify.patch
kprobes-support-probing-module-__init-function.patch

[PATCH -mm] bugfix: release old_p's insn_slot before error return

[Masami Hiramatsu]

Hi Andrew,

akpm@linux-foundation.org wrote:
> The patch titled
>      bugfix: pass aggr_kprobe to arch_remove_kprobe
> has been added to the -mm tree.  Its filename is
>      kprobes-support-probing-module-__exit-function-fix-2.patch

Oops, sorry, I found one another bug...

Release old_p->ainsn.insn_slot before error return, if the memory
allocation of new aggr_kprobe is failed.

Signed-off-by: Masami Hiramatsu  <mhiramat@redhat.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
---
 kernel/kprobes.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: 2.6.28-rc4/kernel/kprobes.c
===================================================================
--- 2.6.28-rc4.orig/kernel/kprobes.c
+++ 2.6.28-rc4/kernel/kprobes.c
@@ -584,8 +584,11 @@ static int __kprobes register_aggr_kprob
 		ap = old_p;
 	} else {
 		ap = kzalloc(sizeof(struct kprobe), GFP_KERNEL);
-		if (!ap)
+		if (!ap) {
+			if (kprobe_gone(old_p))
+				arch_remove_kprobe(old_p);
 			return -ENOMEM;
+		}
 		add_aggr_kprobe(ap, old_p);
 		copy_kprobe(ap, p);
 		ret = add_new_kprobe(ap, p);


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com