linux-kernel - [PATCH] list debugging: warn when deleting a deleted entry

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed,  5 May 2010 11:14:29 +0300
From:	Baruch Siach <baruch@...s.co.il>
To:	Dave Jones <davej@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Baruch Siach <baruch@...s.co.il>
Subject: [PATCH] list debugging: warn when deleting a deleted entry

Use the magic LIST_POISON* values to detect an incorrect use of list_del on a
deleted entry. This DEBUG_LIST specific warning is easier to understand than
the generic Oops message caused by LIST_POISON dereference.

Signed-off-by: Baruch Siach <baruch@...s.co.il>
---
 lib/list_debug.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/lib/list_debug.c b/lib/list_debug.c
index 1a39f4e..344c710 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -43,6 +43,12 @@ EXPORT_SYMBOL(__list_add);
  */
 void list_del(struct list_head *entry)
 {
+	WARN(entry->next == LIST_POISON1,
+		"list_del corruption, next is LIST_POISON1 (%p)\n",
+		LIST_POISON1);
+	WARN(entry->next != LIST_POISON1 && entry->prev == LIST_POISON2,
+		"list_del corruption, prev is LIST_POISON2 (%p)\n",
+		LIST_POISON2);
 	WARN(entry->prev->next != entry,
 		"list_del corruption. prev->next should be %p, "
 		"but was %p\n", entry, entry->prev->next);
-- 
1.7.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/