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Message-Id: <1424278933-26952-1-git-send-email-pmladek@suse.cz> Date: Wed, 18 Feb 2015 18:02:13 +0100 From: Petr Mladek <pmladek@...e.cz> To: jpoimboe@...hat.com, sjenning@...hat.com, jkosina@...e.cz, vojtech@...e.cz Cc: masami.hiramatsu.pt@...achi.com, mbenes@...e.cz, live-patching@...r.kernel.org, linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.cz> Subject: [PATCH] livepatch: RCU protect struct klp_func all the time when used in klp_ftrace_handler() func->new_func has been accessed after rcu_read_unlock() in klp_ftrace_handler() and therefore the access was not protected. Signed-off-by: Petr Mladek <pmladek@...e.cz> --- kernel/livepatch/core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c index ff7f47d026ac..cde66192e20e 100644 --- a/kernel/livepatch/core.c +++ b/kernel/livepatch/core.c @@ -314,12 +314,12 @@ static void notrace klp_ftrace_handler(unsigned long ip, rcu_read_lock(); func = list_first_or_null_rcu(&ops->func_stack, struct klp_func, stack_node); - rcu_read_unlock(); - if (WARN_ON_ONCE(!func)) - return; + goto unlock; klp_arch_set_pc(regs, (unsigned long)func->new_func); +unlock: + rcu_read_unlock(); } static int klp_disable_func(struct klp_func *func) -- 1.8.5.6 -- 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/
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