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([2001:41d0:303:db6b::]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48e71b78f95sm3304241f8f.28.2026.10.30.07.52.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2026 07:52:30 -0700 (PDT) From: Tristan Madani To: Steffen Klassert , Herbert Xu Cc: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Tristan Madani Subject: [PATCH v2 ipsec-next] xfrm: check state validity under lock in xfrm_state_find() Date: Fri, 30 Oct 2026 14:52:29 +0000 Message-ID: <20261030145229.74412-1-tristmd@gmail.com> X-Mailer: git-send-email 2.47.3 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Tristan Madani The output-cache insertion path in xfrm_state_find() checks x->km.state == XFRM_STATE_VALID before acquiring xfrm_state_lock, then inserts the state into pol->state_cache_list under the lock. While this insertion block is currently unreachable -- cached is set unconditionally at the cached: label, making the !cached guard always false -- the correct pattern is to perform the validity check under the lock, matching the fix in commit ddd3d01329203 ("xfrm: Fix xfrm state cache insertion race") which addressed the same TOCTOU for the input cache path. Move the XFRM_STATE_VALID check inside the critical section so the pattern is correct when the cache insertion becomes reachable. Signed-off-by: Tristan Madani --- Changes in v2: - Reclassify as hardening: the insertion block is currently unreachable (cached is unconditionally true at the cached: label), as identified by sashiko AI review. Drop Fixes: and Cc: stable tags accordingly. Move from ipsec to ipsec-next tree since this is a cleanup. - Reword commit message to describe the current state honestly and frame as a preventive correctness improvement. net/xfrm/xfrm_state.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index e45aa1ed5b965..03baa50f0df7c 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -1632,10 +1632,11 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, *err = acquire_in_progress ? -EAGAIN : error; } - if (x && x->km.state == XFRM_STATE_VALID && !cached && + if (x && !cached && (!(pol->flags & XFRM_POLICY_CPU_ACQUIRE) || x->pcpu_num == pcpu_id)) { spin_lock_bh(&net->xfrm.xfrm_state_lock); - if (hlist_unhashed(&x->state_cache)) + if (x->km.state == XFRM_STATE_VALID && + hlist_unhashed(&x->state_cache)) hlist_add_head_rcu(&x->state_cache, &pol->state_cache_list); spin_unlock_bh(&net->xfrm.xfrm_state_lock); } -- 2.47.3