From 6bd5ce6089b561f5392460bfb654dea89356ab1b Mon Sep 17 00:00:00 2001 From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Date: Mon, 16 Dec 2019 19:16:48 +0900 Subject: tomoyo: Suppress RCU warning at list_for_each_entry_rcu(). John Garry has reported that allmodconfig kernel on arm64 causes flood of "RCU-list traversed in non-reader section!!" warning. I don't know what change caused this warning, but this warning is safe because TOMOYO uses SRCU lock instead. Let's suppress this warning by explicitly telling that the caller is holding SRCU lock. Reported-and-tested-by: John Garry <john.garry@huawei.com> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> --- security/tomoyo/common.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'security/tomoyo/common.c') diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c index dd3d5942e669..c36bafbcd77e 100644 --- a/security/tomoyo/common.c +++ b/security/tomoyo/common.c @@ -951,7 +951,8 @@ static bool tomoyo_manager(void) exe = tomoyo_get_exe(); if (!exe) return false; - list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list) { + list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list, + srcu_read_lock_held(&tomoyo_ss)) { if (!ptr->head.is_deleted && (!tomoyo_pathcmp(domainname, ptr->manager) || !strcmp(exe, ptr->manager->name))) { @@ -1095,7 +1096,8 @@ static int tomoyo_delete_domain(char *domainname) if (mutex_lock_interruptible(&tomoyo_policy_lock)) return -EINTR; /* Is there an active domain? */ - list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { + list_for_each_entry_rcu(domain, &tomoyo_domain_list, list, + srcu_read_lock_held(&tomoyo_ss)) { /* Never delete tomoyo_kernel_domain */ if (domain == &tomoyo_kernel_domain) continue; @@ -2778,7 +2780,8 @@ void tomoyo_check_profile(void) tomoyo_policy_loaded = true; pr_info("TOMOYO: 2.6.0\n"); - list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { + list_for_each_entry_rcu(domain, &tomoyo_domain_list, list, + srcu_read_lock_held(&tomoyo_ss)) { const u8 profile = domain->profile; struct tomoyo_policy_namespace *ns = domain->ns; -- cgit v1.2.3