From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com,
bobby.prani@gmail.com, Kees Cook <keescook@chromium.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 2/7] rculist: Consolidate DEBUG_LIST for list_add_rcu()
Date: Mon, 14 Nov 2016 09:55:28 -0800 [thread overview]
Message-ID: <1479146133-23058-2-git-send-email-paulmck@linux.vnet.ibm.com> (raw)
In-Reply-To: <20161114175500.GA21637@linux.vnet.ibm.com>
From: Kees Cook <keescook@chromium.org>
This commit consolidates the debug checking for list_add_rcu() into the
new single __list_add_valid() debug function. Notably, this commit fixes
the sanity check that was added in commit 17a801f4bfeb ("list_debug:
WARN for adding something already in the list"), which wasn't checking
RCU-protected lists.
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Rik van Riel <riel@redhat.com>
---
include/linux/rculist.h | 8 +++-----
lib/list_debug.c | 19 -------------------
2 files changed, 3 insertions(+), 24 deletions(-)
diff --git a/include/linux/rculist.h b/include/linux/rculist.h
index 8beb98dcf14f..4f7a9561b8c4 100644
--- a/include/linux/rculist.h
+++ b/include/linux/rculist.h
@@ -45,19 +45,17 @@ static inline void INIT_LIST_HEAD_RCU(struct list_head *list)
* This is only for internal list manipulation where we know
* the prev/next entries already!
*/
-#ifndef CONFIG_DEBUG_LIST
static inline void __list_add_rcu(struct list_head *new,
struct list_head *prev, struct list_head *next)
{
+ if (!__list_add_valid(new, prev, next))
+ return;
+
new->next = next;
new->prev = prev;
rcu_assign_pointer(list_next_rcu(prev), new);
next->prev = new;
}
-#else
-void __list_add_rcu(struct list_head *new,
- struct list_head *prev, struct list_head *next);
-#endif
/**
* list_add_rcu - add a new entry to rcu-protected list
diff --git a/lib/list_debug.c b/lib/list_debug.c
index 149dd57b583b..d0b89b9d0736 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -77,22 +77,3 @@ void list_del(struct list_head *entry)
entry->prev = LIST_POISON2;
}
EXPORT_SYMBOL(list_del);
-
-/*
- * RCU variants.
- */
-void __list_add_rcu(struct list_head *new,
- struct list_head *prev, struct list_head *next)
-{
- WARN(next->prev != prev,
- "list_add_rcu corruption. next->prev should be prev (%p), but was %p. (next=%p).\n",
- prev, next->prev, next);
- WARN(prev->next != next,
- "list_add_rcu corruption. prev->next should be next (%p), but was %p. (prev=%p).\n",
- next, prev->next, prev);
- new->next = next;
- new->prev = prev;
- rcu_assign_pointer(list_next_rcu(prev), new);
- next->prev = new;
-}
-EXPORT_SYMBOL(__list_add_rcu);
--
2.5.2
next prev parent reply other threads:[~2016-11-14 17:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-14 17:55 [PATCH tip/core/rcu 0/7] Security-related list changes for 4.10 Paul E. McKenney
2016-11-14 17:55 ` [PATCH tip/core/rcu 1/7] list: Split list_add() debug checking into separate function Paul E. McKenney
2016-11-14 17:55 ` Paul E. McKenney [this message]
2016-11-14 17:55 ` [PATCH tip/core/rcu 3/7] list: Split list_del() " Paul E. McKenney
2016-11-14 17:55 ` [PATCH tip/core/rcu 4/7] bug: Provide toggle for BUG on data corruption Paul E. McKenney
2016-11-14 17:55 ` [PATCH tip/core/rcu 5/7] lkdtm: Add tests for struct list corruption Paul E. McKenney
2016-11-14 17:55 ` [PATCH tip/core/rcu 6/7] lib/Kconfig.debug: Fix typo in select statement Paul E. McKenney
2016-11-14 17:55 ` [PATCH tip/core/rcu 7/7] bug: Avoid Kconfig warning for BUG_ON_DATA_CORRUPTION Paul E. McKenney
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