From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, T_DKIMWL_WL_MED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2C75C43144 for ; Tue, 26 Jun 2018 13:21:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 51C5726B2D for ; Tue, 26 Jun 2018 13:21:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="GVqyBGpl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 51C5726B2D Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935587AbeFZNVY (ORCPT ); Tue, 26 Jun 2018 09:21:24 -0400 Received: from mail-wm0-f66.google.com ([74.125.82.66]:36518 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934500AbeFZNPf (ORCPT ); Tue, 26 Jun 2018 09:15:35 -0400 Received: by mail-wm0-f66.google.com with SMTP id u18-v6so1813023wmc.1 for ; Tue, 26 Jun 2018 06:15:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=h+w/RfSoe7vFwRBZqp0mipO9iDkrtLr0wWkxSLbdGRk=; b=GVqyBGplKmoOdAmW9sh0fypn/l2SeKW5g8MvDrOkKhJXOUPjAk1LAM8+GsFWdZwCc3 NhMR+pWvagQJCZZUt3GjhNOLe9lffMU2Dz8DkPvrPGbVSgcFpYLO16IJDUgb77Tj2TwR c29PJB7uExTRT6Z1zmPgqHjlEgzZ44Up3Tygrx6o8w92PYfBLGJW/dLtrkWNxToZc6lx OpTzAqR1UA9CB/iUW9G6w6FGlUb4RvaGkLNMZfQyOPkWJkb1Lb6MPZ35+vqQnytJeb4H lRtS+wSStruAbLvr1b0TgrdRvzmbmiJing0/VhM8x1rmYcwkBt5Nhx9e14ltwtIEQZDB byPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=h+w/RfSoe7vFwRBZqp0mipO9iDkrtLr0wWkxSLbdGRk=; b=kIXkmC0OMPrSmT659x+uUSRwd+F20KX/0cGEWegP67JRncGJ6e/IMNCjWbzq6ecKXz Mb1c3eFVy0Dm2S/KyfdEan5J2AFFqkoMUd+UAuYrgtyRwzkvfpYprPbBhsHXgr16TQAW IW43pgegNGAHiOWjkBvalCVdI2Ww+fu/2cnODw1kaTZ+gZg7vdSMtjt6mfi+6Tl9aUpG DGF2MG4MZS1S09L6Ri4lQNxI518swt75k6CbzNjgNhMIt+hUYPySwKuIxY/lsjDufYHs IyI9wNlj5Gx9sRthmHQjeC2kRzKUEZc0WJvEJdGHoWeRXrz/2ZnFuYQe2czbTbxKhM8S wdvA== X-Gm-Message-State: APt69E1danKAVZEFjWpbSnrqRQuYIZVFx+0CAcj5BFR/hORjbf514y21 cu21KcWStY8f7jzgoV9p41dZlQ== X-Google-Smtp-Source: AAOMgpf2bwC+JGzRa3DE1NDxe3DYwaeZoddk1O+8AUJjLvMdX1D9HQWEMAe0vg+UqazR3PqhYa57Ww== X-Received: by 2002:a1c:5c93:: with SMTP id q141-v6mr1610193wmb.77.1530018933679; Tue, 26 Jun 2018 06:15:33 -0700 (PDT) Received: from andreyknvl0.muc.corp.google.com ([2a00:79e0:15:10:84be:a42a:826d:c530]) by smtp.gmail.com with ESMTPSA id w15-v6sm2162639wrn.25.2018.06.26.06.15.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 26 Jun 2018 06:15:32 -0700 (PDT) From: Andrey Konovalov To: Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Catalin Marinas , Will Deacon , Christoph Lameter , Andrew Morton , Mark Rutland , Nick Desaulniers , Marc Zyngier , Dave Martin , Ard Biesheuvel , "Eric W . Biederman" , Ingo Molnar , Paul Lawrence , Geert Uytterhoeven , Arnd Bergmann , "Kirill A . Shutemov" , Greg Kroah-Hartman , Kate Stewart , Mike Rapoport , kasan-dev@googlegroups.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sparse@vger.kernel.org, linux-mm@kvack.org, linux-kbuild@vger.kernel.org Cc: Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Jann Horn , Mark Brand , Chintan Pandya , Andrey Konovalov Subject: [PATCH v4 01/17] khwasan, mm: change kasan hooks signatures Date: Tue, 26 Jun 2018 15:15:11 +0200 Message-Id: <5e472107368b64759f60987065bb557e79bdebe6.1530018818.git.andreyknvl@google.com> X-Mailer: git-send-email 2.18.0.rc2.346.g013aa6912e-goog In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org KHWASAN will change the value of the top byte of pointers returned from the kernel allocation functions (such as kmalloc). This patch updates KASAN hooks signatures and their usage in SLAB and SLUB code to reflect that. Signed-off-by: Andrey Konovalov --- include/linux/kasan.h | 34 +++++++++++++++++++++++----------- mm/kasan/kasan.c | 24 ++++++++++++++---------- mm/slab.c | 12 ++++++------ mm/slab.h | 2 +- mm/slab_common.c | 4 ++-- mm/slub.c | 15 +++++++-------- 6 files changed, 53 insertions(+), 38 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index de784fd11d12..cbdc54543803 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -53,14 +53,14 @@ void kasan_unpoison_object_data(struct kmem_cache *cache, void *object); void kasan_poison_object_data(struct kmem_cache *cache, void *object); void kasan_init_slab_obj(struct kmem_cache *cache, const void *object); -void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags); +void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags); void kasan_kfree_large(void *ptr, unsigned long ip); void kasan_poison_kfree(void *ptr, unsigned long ip); -void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, +void *kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, gfp_t flags); -void kasan_krealloc(const void *object, size_t new_size, gfp_t flags); +void *kasan_krealloc(const void *object, size_t new_size, gfp_t flags); -void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags); +void *kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags); bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip); struct kasan_cache { @@ -105,16 +105,28 @@ static inline void kasan_poison_object_data(struct kmem_cache *cache, static inline void kasan_init_slab_obj(struct kmem_cache *cache, const void *object) {} -static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {} +static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) +{ + return ptr; +} static inline void kasan_kfree_large(void *ptr, unsigned long ip) {} static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {} -static inline void kasan_kmalloc(struct kmem_cache *s, const void *object, - size_t size, gfp_t flags) {} -static inline void kasan_krealloc(const void *object, size_t new_size, - gfp_t flags) {} +static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object, + size_t size, gfp_t flags) +{ + return (void *)object; +} +static inline void *kasan_krealloc(const void *object, size_t new_size, + gfp_t flags) +{ + return (void *)object; +} -static inline void kasan_slab_alloc(struct kmem_cache *s, void *object, - gfp_t flags) {} +static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object, + gfp_t flags) +{ + return object; +} static inline bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip) { diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c index f185455b3406..f04aa1e0ba48 100644 --- a/mm/kasan/kasan.c +++ b/mm/kasan/kasan.c @@ -485,9 +485,9 @@ void kasan_init_slab_obj(struct kmem_cache *cache, const void *object) __memset(alloc_info, 0, sizeof(*alloc_info)); } -void kasan_slab_alloc(struct kmem_cache *cache, void *object, gfp_t flags) +void *kasan_slab_alloc(struct kmem_cache *cache, void *object, gfp_t flags) { - kasan_kmalloc(cache, object, cache->object_size, flags); + return kasan_kmalloc(cache, object, cache->object_size, flags); } static bool __kasan_slab_free(struct kmem_cache *cache, void *object, @@ -528,7 +528,7 @@ bool kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip) return __kasan_slab_free(cache, object, ip, true); } -void kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size, +void *kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size, gfp_t flags) { unsigned long redzone_start; @@ -538,7 +538,7 @@ void kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size, quarantine_reduce(); if (unlikely(object == NULL)) - return; + return NULL; redzone_start = round_up((unsigned long)(object + size), KASAN_SHADOW_SCALE_SIZE); @@ -551,10 +551,12 @@ void kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size, if (cache->flags & SLAB_KASAN) set_track(&get_alloc_info(cache, object)->alloc_track, flags); + + return (void *)object; } EXPORT_SYMBOL(kasan_kmalloc); -void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags) +void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags) { struct page *page; unsigned long redzone_start; @@ -564,7 +566,7 @@ void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags) quarantine_reduce(); if (unlikely(ptr == NULL)) - return; + return NULL; page = virt_to_page(ptr); redzone_start = round_up((unsigned long)(ptr + size), @@ -574,21 +576,23 @@ void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags) kasan_unpoison_shadow(ptr, size); kasan_poison_shadow((void *)redzone_start, redzone_end - redzone_start, KASAN_PAGE_REDZONE); + + return (void *)ptr; } -void kasan_krealloc(const void *object, size_t size, gfp_t flags) +void *kasan_krealloc(const void *object, size_t size, gfp_t flags) { struct page *page; if (unlikely(object == ZERO_SIZE_PTR)) - return; + return ZERO_SIZE_PTR; page = virt_to_head_page(object); if (unlikely(!PageSlab(page))) - kasan_kmalloc_large(object, size, flags); + return kasan_kmalloc_large(object, size, flags); else - kasan_kmalloc(page->slab_cache, object, size, flags); + return kasan_kmalloc(page->slab_cache, object, size, flags); } void kasan_poison_kfree(void *ptr, unsigned long ip) diff --git a/mm/slab.c b/mm/slab.c index aa76a70e087e..6fdca9ec2ea4 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3551,7 +3551,7 @@ void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags) { void *ret = slab_alloc(cachep, flags, _RET_IP_); - kasan_slab_alloc(cachep, ret, flags); + ret = kasan_slab_alloc(cachep, ret, flags); trace_kmem_cache_alloc(_RET_IP_, ret, cachep->object_size, cachep->size, flags); @@ -3617,7 +3617,7 @@ kmem_cache_alloc_trace(struct kmem_cache *cachep, gfp_t flags, size_t size) ret = slab_alloc(cachep, flags, _RET_IP_); - kasan_kmalloc(cachep, ret, size, flags); + ret = kasan_kmalloc(cachep, ret, size, flags); trace_kmalloc(_RET_IP_, ret, size, cachep->size, flags); return ret; @@ -3641,7 +3641,7 @@ void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid) { void *ret = slab_alloc_node(cachep, flags, nodeid, _RET_IP_); - kasan_slab_alloc(cachep, ret, flags); + ret = kasan_slab_alloc(cachep, ret, flags); trace_kmem_cache_alloc_node(_RET_IP_, ret, cachep->object_size, cachep->size, flags, nodeid); @@ -3660,7 +3660,7 @@ void *kmem_cache_alloc_node_trace(struct kmem_cache *cachep, ret = slab_alloc_node(cachep, flags, nodeid, _RET_IP_); - kasan_kmalloc(cachep, ret, size, flags); + ret = kasan_kmalloc(cachep, ret, size, flags); trace_kmalloc_node(_RET_IP_, ret, size, cachep->size, flags, nodeid); @@ -3679,7 +3679,7 @@ __do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller) if (unlikely(ZERO_OR_NULL_PTR(cachep))) return cachep; ret = kmem_cache_alloc_node_trace(cachep, flags, node, size); - kasan_kmalloc(cachep, ret, size, flags); + ret = kasan_kmalloc(cachep, ret, size, flags); return ret; } @@ -3715,7 +3715,7 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags, return cachep; ret = slab_alloc(cachep, flags, caller); - kasan_kmalloc(cachep, ret, size, flags); + ret = kasan_kmalloc(cachep, ret, size, flags); trace_kmalloc(caller, ret, size, cachep->size, flags); diff --git a/mm/slab.h b/mm/slab.h index 68bdf498da3b..15ef6a0d9c16 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -441,7 +441,7 @@ static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, kmemleak_alloc_recursive(object, s->object_size, 1, s->flags, flags); - kasan_slab_alloc(s, object, flags); + p[i] = kasan_slab_alloc(s, object, flags); } if (memcg_kmem_enabled()) diff --git a/mm/slab_common.c b/mm/slab_common.c index 890b1f04a03a..c279b52c7565 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -1179,7 +1179,7 @@ void *kmalloc_order(size_t size, gfp_t flags, unsigned int order) page = alloc_pages(flags, order); ret = page ? page_address(page) : NULL; kmemleak_alloc(ret, size, 1, flags); - kasan_kmalloc_large(ret, size, flags); + ret = kasan_kmalloc_large(ret, size, flags); return ret; } EXPORT_SYMBOL(kmalloc_order); @@ -1457,7 +1457,7 @@ static __always_inline void *__do_krealloc(const void *p, size_t new_size, ks = ksize(p); if (ks >= new_size) { - kasan_krealloc((void *)p, new_size, flags); + p = kasan_krealloc((void *)p, new_size, flags); return (void *)p; } diff --git a/mm/slub.c b/mm/slub.c index a3b8467c14af..a60887938c19 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1336,10 +1336,10 @@ static inline void dec_slabs_node(struct kmem_cache *s, int node, * Hooks for other subsystems that check memory allocations. In a typical * production configuration these hooks all should produce no code at all. */ -static inline void kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags) +static inline void *kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags) { kmemleak_alloc(ptr, size, 1, flags); - kasan_kmalloc_large(ptr, size, flags); + return kasan_kmalloc_large(ptr, size, flags); } static __always_inline void kfree_hook(void *x) @@ -2732,7 +2732,7 @@ void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size) { void *ret = slab_alloc(s, gfpflags, _RET_IP_); trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags); - kasan_kmalloc(s, ret, size, gfpflags); + ret = kasan_kmalloc(s, ret, size, gfpflags); return ret; } EXPORT_SYMBOL(kmem_cache_alloc_trace); @@ -2760,7 +2760,7 @@ void *kmem_cache_alloc_node_trace(struct kmem_cache *s, trace_kmalloc_node(_RET_IP_, ret, size, s->size, gfpflags, node); - kasan_kmalloc(s, ret, size, gfpflags); + ret = kasan_kmalloc(s, ret, size, gfpflags); return ret; } EXPORT_SYMBOL(kmem_cache_alloc_node_trace); @@ -3750,7 +3750,7 @@ void *__kmalloc(size_t size, gfp_t flags) trace_kmalloc(_RET_IP_, ret, size, s->size, flags); - kasan_kmalloc(s, ret, size, flags); + ret = kasan_kmalloc(s, ret, size, flags); return ret; } @@ -3767,8 +3767,7 @@ static void *kmalloc_large_node(size_t size, gfp_t flags, int node) if (page) ptr = page_address(page); - kmalloc_large_node_hook(ptr, size, flags); - return ptr; + return kmalloc_large_node_hook(ptr, size, flags); } void *__kmalloc_node(size_t size, gfp_t flags, int node) @@ -3795,7 +3794,7 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node) trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node); - kasan_kmalloc(s, ret, size, flags); + ret = kasan_kmalloc(s, ret, size, flags); return ret; } -- 2.18.0.rc2.346.g013aa6912e-goog