From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-188.mta0.migadu.com (out-188.mta0.migadu.com [91.218.175.188]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 459C963505 for ; Thu, 21 Dec 2023 18:35:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="Wp4SgxAx" 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=1703183748; 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=wLcCaNYp1HtmrZAPrigLSWnYXTa9aslZ8ruUHa0DHbo=; b=Wp4SgxAxzf33U9vG6eCpb57dWh/1TqzRC2qPSlMKfzo4YFjahK6jxrjxwucpfy7HNf515z HVTQaBE2QE4c7zE1ojOnJfPr31drq3YJKN5R0J3wvccZ6BKYlSSN5VG/UPs4jM7chLnJJ2 iVscHV7PW/6Z659boGsoyF6DsXA5Ssw= From: andrey.konovalov@linux.dev To: Andrew Morton , Juntong Deng Cc: Andrey Konovalov , Marco Elver , Alexander Potapenko , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov Subject: [PATCH mm 3/4] kasan: simplify saving extra info into tracks Date: Thu, 21 Dec 2023 19:35:39 +0100 Message-Id: <20231221183540.168428-3-andrey.konovalov@linux.dev> In-Reply-To: <20231221183540.168428-1-andrey.konovalov@linux.dev> References: <20231221183540.168428-1-andrey.konovalov@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT From: Andrey Konovalov Avoid duplicating code for saving extra info into tracks: reuse the common function for this. Fixes: 5d4c6ac94694 ("kasan: record and report more information") Signed-off-by: Andrey Konovalov --- mm/kasan/common.c | 12 ++++++++++-- mm/kasan/generic.c | 4 ++-- mm/kasan/kasan.h | 3 ++- mm/kasan/tags.c | 17 +---------------- 4 files changed, 15 insertions(+), 21 deletions(-) diff --git a/mm/kasan/common.c b/mm/kasan/common.c index fe6c4b43ad9f..d004a0f4406c 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -48,7 +48,7 @@ depot_stack_handle_t kasan_save_stack(gfp_t flags, depot_flags_t depot_flags) return stack_depot_save_flags(entries, nr_entries, flags, depot_flags); } -void kasan_set_track(struct kasan_track *track, gfp_t flags) +void kasan_set_track(struct kasan_track *track, depot_stack_handle_t stack) { #ifdef CONFIG_KASAN_EXTRA_INFO u32 cpu = raw_smp_processor_id(); @@ -58,8 +58,16 @@ void kasan_set_track(struct kasan_track *track, gfp_t flags) track->timestamp = ts_nsec >> 3; #endif /* CONFIG_KASAN_EXTRA_INFO */ track->pid = current->pid; - track->stack = kasan_save_stack(flags, + track->stack = stack; +} + +void kasan_save_track(struct kasan_track *track, gfp_t flags) +{ + depot_stack_handle_t stack; + + stack = kasan_save_stack(flags, STACK_DEPOT_FLAG_CAN_ALLOC | STACK_DEPOT_FLAG_GET); + kasan_set_track(track, stack); } #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c index 769e43e05d0b..11b575707b05 100644 --- a/mm/kasan/generic.c +++ b/mm/kasan/generic.c @@ -553,7 +553,7 @@ void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags) stack_depot_put(alloc_meta->aux_stack[1]); __memset(alloc_meta, 0, sizeof(*alloc_meta)); - kasan_set_track(&alloc_meta->alloc_track, flags); + kasan_save_track(&alloc_meta->alloc_track, flags); } void kasan_save_free_info(struct kmem_cache *cache, void *object) @@ -564,7 +564,7 @@ void kasan_save_free_info(struct kmem_cache *cache, void *object) if (!free_meta) return; - kasan_set_track(&free_meta->free_track, 0); + kasan_save_track(&free_meta->free_track, 0); /* The object was freed and has free track set. */ *(u8 *)kasan_mem_to_shadow(object) = KASAN_SLAB_FREETRACK; } diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index 9072ce4c1263..31fb6bb26fed 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -372,7 +372,8 @@ static inline void kasan_init_object_meta(struct kmem_cache *cache, const void * #endif depot_stack_handle_t kasan_save_stack(gfp_t flags, depot_flags_t depot_flags); -void kasan_set_track(struct kasan_track *track, gfp_t flags); +void kasan_set_track(struct kasan_track *track, depot_stack_handle_t stack); +void kasan_save_track(struct kasan_track *track, gfp_t flags); void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags); void kasan_save_free_info(struct kmem_cache *cache, void *object); diff --git a/mm/kasan/tags.c b/mm/kasan/tags.c index c4d14dbf27c0..d65d48b85f90 100644 --- a/mm/kasan/tags.c +++ b/mm/kasan/tags.c @@ -94,17 +94,6 @@ void __init kasan_init_tags(void) } } -#ifdef CONFIG_KASAN_EXTRA_INFO -static void save_extra_info(struct kasan_stack_ring_entry *entry) -{ - u32 cpu = raw_smp_processor_id(); - u64 ts_nsec = local_clock(); - - entry->track.cpu = cpu; - entry->track.timestamp = ts_nsec >> 3; -} -#endif /* CONFIG_KASAN_EXTRA_INFO */ - static void save_stack_info(struct kmem_cache *cache, void *object, gfp_t gfp_flags, bool is_free) { @@ -137,11 +126,7 @@ static void save_stack_info(struct kmem_cache *cache, void *object, old_stack = entry->track.stack; entry->size = cache->object_size; - entry->track.pid = current->pid; - entry->track.stack = stack; -#ifdef CONFIG_KASAN_EXTRA_INFO - save_extra_info(entry); -#endif /* CONFIG_KASAN_EXTRA_INFO */ + kasan_set_track(&entry->track, stack); entry->is_free = is_free; entry->ptr = object; -- 2.25.1