From nobody Sun Dec 14 06:42:50 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5E022C83F19 for ; Tue, 29 Aug 2023 17:15:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237746AbjH2ROy (ORCPT ); Tue, 29 Aug 2023 13:14:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60246 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237767AbjH2ROh (ORCPT ); Tue, 29 Aug 2023 13:14:37 -0400 Received: from out-250.mta1.migadu.com (out-250.mta1.migadu.com [IPv6:2001:41d0:203:375::fa]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B4F81BD for ; Tue, 29 Aug 2023 10:14:00 -0700 (PDT) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1693329225; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nl/mi/sJhm8d2IDMyyx9SK432XHk6oEEQ1PTooRDAe8=; b=GlaqijiJCNuxG7rw/crBXwYIu+bsbRgtfNjI15SsNv8t1sbXPGyc+8Qf9Y8QvqLJiZuTi7 ZNtWdGIvQFFzknC6Cszo4DXXBT6fdVhnEoWLc28FUoQtxU/76o7hIYC2gdCczCKWh6/THq P/TGvd/MEaLMkz+3R7oGxuH+BvdITeQ= From: andrey.konovalov@linux.dev To: Marco Elver , Alexander Potapenko Cc: Andrey Konovalov , Dmitry Vyukov , Vlastimil Babka , kasan-dev@googlegroups.com, Evgenii Stepanov , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov Subject: [PATCH 15/15] kasan: use stack_depot_evict for tag-based modes Date: Tue, 29 Aug 2023 19:11:25 +0200 Message-Id: In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Andrey Konovalov Evict stack traces from the stack depot for the tag-based KASAN modes once they are evicted from the stack ring. Signed-off-by: Andrey Konovalov --- mm/kasan/tags.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/kasan/tags.c b/mm/kasan/tags.c index 7dcfe341d48e..fa6b0f77a7dd 100644 --- a/mm/kasan/tags.c +++ b/mm/kasan/tags.c @@ -96,7 +96,7 @@ static void save_stack_info(struct kmem_cache *cache, voi= d *object, gfp_t gfp_flags, bool is_free) { unsigned long flags; - depot_stack_handle_t stack; + depot_stack_handle_t stack, old_stack; u64 pos; struct kasan_stack_ring_entry *entry; void *old_ptr; @@ -120,6 +120,8 @@ static void save_stack_info(struct kmem_cache *cache, v= oid *object, if (!try_cmpxchg(&entry->ptr, &old_ptr, STACK_RING_BUSY_PTR)) goto next; /* Busy slot. */ =20 + old_stack =3D READ_ONCE(entry->stack); + WRITE_ONCE(entry->size, cache->object_size); WRITE_ONCE(entry->pid, current->pid); WRITE_ONCE(entry->stack, stack); @@ -131,6 +133,9 @@ static void save_stack_info(struct kmem_cache *cache, v= oid *object, smp_store_release(&entry->ptr, (s64)object); =20 read_unlock_irqrestore(&stack_ring.lock, flags); + + if (old_stack) + stack_depot_evict(old_stack); } =20 void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t f= lags) --=20 2.25.1