From: Will Deacon <will@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Will Deacon <will@kernel.org>, Eric Dumazet <edumazet@google.com>,
Jann Horn <jannh@google.com>, Kees Cook <keescook@chromium.org>,
Maddie Stone <maddiestone@google.com>,
Marco Elver <elver@google.com>,
"Paul E . McKenney" <paulmck@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
kernel-team@android.com, kernel-hardening@lists.openwall.com
Subject: [RFC PATCH 18/21] list_bl: Move integrity checking out of line
Date: Tue, 24 Mar 2020 15:36:40 +0000 [thread overview]
Message-ID: <20200324153643.15527-19-will@kernel.org> (raw)
In-Reply-To: <20200324153643.15527-1-will@kernel.org>
In preparation for adding full integrity checking to 'hlist_bl', move
the checks out of line before they become more bloated. At the same,
swap the argument order for __hlist_bl_add_head_valid() so that it
follows the same convention as __hlist_add_head_valid().
Signed-off-by: Will Deacon <will@kernel.org>
---
include/linux/list_bl.h | 34 ++++++----------------------------
include/linux/rculist_bl.h | 2 +-
lib/list_debug.c | 28 ++++++++++++++++++++++++++++
3 files changed, 35 insertions(+), 29 deletions(-)
diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h
index 0839c4f43e6d..dd74043ebae6 100644
--- a/include/linux/list_bl.h
+++ b/include/linux/list_bl.h
@@ -33,34 +33,12 @@ struct hlist_bl_node {
};
#ifdef CONFIG_CHECK_INTEGRITY_LIST
-static inline bool __hlist_bl_add_head_valid(struct hlist_bl_head *h,
- struct hlist_bl_node *n)
-{
- unsigned long hlock = (unsigned long)h->first & LIST_BL_LOCKMASK;
- unsigned long nlock = (unsigned long)n & LIST_BL_LOCKMASK;
-
- return !(CHECK_DATA_CORRUPTION(nlock,
- "hlist_bl_add_head: node is locked\n") ||
- CHECK_DATA_CORRUPTION(hlock != LIST_BL_LOCKMASK,
- "hlist_bl_add_head: head is unlocked\n"));
-}
-
-static inline bool __hlist_bl_del_valid(struct hlist_bl_node *n)
-{
- unsigned long nlock = (unsigned long)n & LIST_BL_LOCKMASK;
-
- return !(CHECK_DATA_CORRUPTION(nlock,
- "hlist_bl_del_valid: node locked") ||
- CHECK_DATA_CORRUPTION(n->next == LIST_POISON1,
- "hlist_bl_del corruption, %px->next is LIST_POISON1 (%px)\n",
- n, LIST_POISON1) ||
- CHECK_DATA_CORRUPTION(n->pprev == LIST_POISON2,
- "hlist_bl_del corruption, %px->pprev is LIST_POISON2 (%px)\n",
- n, LIST_POISON2));
-}
+extern bool __hlist_bl_add_head_valid(struct hlist_bl_node *n,
+ struct hlist_bl_head *h);
+extern bool __hlist_bl_del_valid(struct hlist_bl_node *node);
#else
-static inline bool __hlist_bl_add_head_valid(struct hlist_bl_head *h,
- struct hlist_bl_node *n)
+static inline bool __hlist_bl_add_head_valid(struct hlist_bl_node *n,
+ struct hlist_bl_head *h)
{
return true;
}
@@ -103,7 +81,7 @@ static inline void hlist_bl_add_head(struct hlist_bl_node *n,
{
struct hlist_bl_node *first = hlist_bl_first(h);
- if (!__hlist_bl_add_head_valid(h, n))
+ if (!__hlist_bl_add_head_valid(n, h))
return;
n->next = first;
diff --git a/include/linux/rculist_bl.h b/include/linux/rculist_bl.h
index 553ce3cde104..9356e7283ff0 100644
--- a/include/linux/rculist_bl.h
+++ b/include/linux/rculist_bl.h
@@ -63,7 +63,7 @@ static inline void hlist_bl_add_head_rcu(struct hlist_bl_node *n,
{
struct hlist_bl_node *first;
- if (!__hlist_bl_add_head_valid(h, n))
+ if (!__hlist_bl_add_head_valid(n, h))
return;
/* don't need hlist_bl_first_rcu because we're under lock */
diff --git a/lib/list_debug.c b/lib/list_debug.c
index b3560de4accc..9591fa6c9337 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -186,3 +186,31 @@ bool __hlist_nulls_del_valid(struct hlist_nulls_node *node)
return true;
}
EXPORT_SYMBOL(__hlist_nulls_del_valid);
+
+bool __hlist_bl_add_head_valid(struct hlist_bl_node *new,
+ struct hlist_bl_head *head)
+{
+ unsigned long hlock = (unsigned long)head->first & LIST_BL_LOCKMASK;
+ unsigned long nlock = (unsigned long)new & LIST_BL_LOCKMASK;
+
+ return !(CHECK_DATA_CORRUPTION(nlock,
+ "hlist_bl_add_head: node is locked\n") ||
+ CHECK_DATA_CORRUPTION(hlock != LIST_BL_LOCKMASK,
+ "hlist_bl_add_head: head is unlocked\n"));
+}
+EXPORT_SYMBOL(__hlist_bl_add_head_valid);
+
+bool __hlist_bl_del_valid(struct hlist_bl_node *node)
+{
+ unsigned long nlock = (unsigned long)node & LIST_BL_LOCKMASK;
+
+ return !(CHECK_DATA_CORRUPTION(nlock,
+ "hlist_bl_del_valid: node locked") ||
+ CHECK_DATA_CORRUPTION(node->next == LIST_POISON1,
+ "hlist_bl_del corruption, %px->next is LIST_POISON1 (%px)\n",
+ node, LIST_POISON1) ||
+ CHECK_DATA_CORRUPTION(node->pprev == LIST_POISON2,
+ "hlist_bl_del corruption, %px->pprev is LIST_POISON2 (%px)\n",
+ node, LIST_POISON2));
+}
+EXPORT_SYMBOL(__hlist_bl_del_valid);
--
2.20.1
next prev parent reply other threads:[~2020-03-24 15:37 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-24 15:36 [RFC PATCH 00/21] Improve list integrity checking Will Deacon
2020-03-24 15:36 ` [RFC PATCH 01/21] list: Remove hlist_unhashed_lockless() Will Deacon
2020-03-24 16:27 ` Greg KH
2020-03-30 23:05 ` Paul E. McKenney
2020-03-24 15:36 ` [RFC PATCH 02/21] list: Remove hlist_nulls_unhashed_lockless() Will Deacon
2020-03-24 16:27 ` Greg KH
2020-03-30 23:07 ` Paul E. McKenney
2020-03-24 15:36 ` [RFC PATCH 03/21] list: Annotate lockless list primitives with data_race() Will Deacon
2020-03-24 16:20 ` Jann Horn
2020-03-24 16:26 ` Greg KH
2020-03-24 16:38 ` Jann Horn
2020-03-24 16:59 ` Greg KH
2020-03-24 18:22 ` Jann Horn
2020-03-24 16:23 ` Marco Elver
2020-03-24 21:33 ` Will Deacon
2020-03-31 13:10 ` Will Deacon
2020-04-01 6:34 ` Marco Elver
2020-04-01 8:40 ` Will Deacon
2020-05-08 13:46 ` [tip: locking/kcsan] kcsan: Change data_race() to no longer require marking racing accesses tip-bot2 for Marco Elver
2020-03-24 16:51 ` [RFC PATCH 03/21] list: Annotate lockless list primitives with data_race() Peter Zijlstra
2020-03-24 16:56 ` Jann Horn
2020-03-24 21:32 ` Will Deacon
2020-03-30 23:13 ` Paul E. McKenney
2020-04-24 17:39 ` Will Deacon
2020-04-27 19:24 ` Paul E. McKenney
2020-03-24 15:36 ` [RFC PATCH 04/21] timers: Use hlist_unhashed() instead of open-coding in timer_pending() Will Deacon
2020-03-24 16:30 ` Greg KH
2020-03-24 15:36 ` [RFC PATCH 05/21] list: Comment missing WRITE_ONCE() in __list_del() Will Deacon
2020-03-30 23:14 ` Paul E. McKenney
2020-03-24 15:36 ` [RFC PATCH 06/21] list: Remove superfluous WRITE_ONCE() from hlist_nulls implementation Will Deacon
2020-03-30 23:21 ` Paul E. McKenney
2020-03-24 15:36 ` [RFC PATCH 07/21] Revert "list: Use WRITE_ONCE() when adding to lists and hlists" Will Deacon
2020-03-30 23:19 ` Paul E. McKenney
2020-03-24 15:36 ` [RFC PATCH 08/21] Revert "list: Use WRITE_ONCE() when initializing list_head structures" Will Deacon
2020-03-30 23:25 ` Paul E. McKenney
2020-03-31 13:11 ` Will Deacon
2020-03-31 13:47 ` Paul E. McKenney
2020-03-24 15:36 ` [RFC PATCH 09/21] list: Remove unnecessary WRITE_ONCE() from hlist_bl_add_before() Will Deacon
2020-03-30 23:30 ` Paul E. McKenney
2020-03-31 12:37 ` Will Deacon
2020-03-24 15:36 ` [RFC PATCH 10/21] kernel-hacking: Make DEBUG_{LIST,PLIST,SG,NOTIFIERS} non-debug options Will Deacon
2020-03-24 16:42 ` Greg KH
2020-03-24 15:36 ` [RFC PATCH 11/21] list: Add integrity checking to hlist implementation Will Deacon
2020-03-24 15:36 ` [RFC PATCH 12/21] list: Poison ->next pointer for non-RCU deletion of 'hlist_nulls_node' Will Deacon
2020-03-30 23:32 ` Paul E. McKenney
2020-03-24 15:36 ` [RFC PATCH 13/21] list: Add integrity checking to hlist_nulls implementation Will Deacon
2020-03-24 15:36 ` [RFC PATCH 14/21] plist: Use CHECK_DATA_CORRUPTION instead of explicit {BUG,WARN}_ON() Will Deacon
2020-03-24 16:42 ` Greg KH
2020-03-24 15:36 ` [RFC PATCH 15/21] list_bl: Use CHECK_DATA_CORRUPTION instead of custom BUG_ON() wrapper Will Deacon
2020-03-24 15:36 ` [RFC PATCH 16/21] list_bl: Extend integrity checking in deletion routines Will Deacon
2020-03-24 15:36 ` [RFC PATCH 17/21] linux/bit_spinlock.h: Include linux/processor.h Will Deacon
2020-03-24 16:28 ` Greg KH
2020-03-24 21:08 ` Will Deacon
2020-03-24 15:36 ` Will Deacon [this message]
2020-03-24 15:36 ` [RFC PATCH 19/21] list_bl: Extend integrity checking to cover the same cases as 'hlist' Will Deacon
2020-03-24 15:36 ` [RFC PATCH 20/21] list: Format CHECK_DATA_CORRUPTION error messages consistently Will Deacon
2020-03-24 16:40 ` Greg KH
2020-03-24 15:36 ` [RFC PATCH 21/21] lkdtm: Extend list corruption checks Will Deacon
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