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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 X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: C5264140012 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: r54gf56kx6uu8ujn1w4o9dikbm8jcpf9 X-HE-Tag: 1693329226-355505 X-HE-Meta: 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 e9sMPY+F xhBkpkAasemI0lPOZaUeNSYuaOSVpvs51jADza4ogaNiDDg0OWSA1zp1Z7D+kMKePB9/y+6AvCBzrir9lxQNKI/hUdSnOG6kFZrIs+1JhfXd4Ure5YvjN4PAFWweNujtqJZ/5 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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, void *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, void *object, if (!try_cmpxchg(&entry->ptr, &old_ptr, STACK_RING_BUSY_PTR)) goto next; /* Busy slot. */ + old_stack = 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, void *object, smp_store_release(&entry->ptr, (s64)object); read_unlock_irqrestore(&stack_ring.lock, flags); + + if (old_stack) + stack_depot_evict(old_stack); } void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)