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d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=PB2wGlTtPDen/ye2PAmCBJ5c7LyFB91+1y/zC60t16Q=; b=GXSc7eOzF5r69lkm97WBq8uX/JiaCpD0sszWwdx3DATZXZ15WLsiDuwBzHdgP6WM2A hA/97c07XB1MfIND/Suaqp6VBQiATUNY8GkSdGR8RyuKZR0pg6/wNVpTRqgL5B0AUBw5 bja6fYq5GMboE9OwPjiRbLgYCqVlxlvVFpl9WvC7hLdDY5i2DNp5Z26rM/dAKrm1K+SN lHHIriS7QW018w/696QlD9NqwTWGsi3O2Cgss/m9EmH+dHJe2Ni4UOIpPiOOHsl79eQk MyfP96g6sq+iQg0pcDAL8qZg9RJjNFVacLLRRx1oJS/9q6Y6WgS0LHCf0uvLKPy45HPy L3dg== X-Gm-Message-State: AOAM530x8PhpxVnTuBzOkNFQ92auTu+BfRFvxWT+wxpUmJbX/XJfgvNe ZI0iCng+ukn4LMhu+XQecRk1tk9RUw== X-Google-Smtp-Source: ABdhPJyR9PqthVFqW2D/mp1NRmsTwOdF86pvoPu4AcBXbRv/V6Z/eH3CtUVQX2fa/YvMlBOBYNXzgwBGqQ== X-Received: from elver.muc.corp.google.com ([2a00:79e0:15:13:f693:9fff:fef4:2449]) (user=elver job=sendgmr) by 2002:a17:907:264c:: with SMTP id ar12mr20711635ejc.80.1600176073238; Tue, 15 Sep 2020 06:21:13 -0700 (PDT) Date: Tue, 15 Sep 2020 15:20:42 +0200 In-Reply-To: <20200915132046.3332537-1-elver@google.com> Message-Id: <20200915132046.3332537-7-elver@google.com> Mime-Version: 1.0 References: <20200915132046.3332537-1-elver@google.com> X-Mailer: git-send-email 2.28.0.618.gf4bc123cb7-goog Subject: [PATCH v2 06/10] kfence, kasan: make KFENCE compatible with KASAN From: Marco Elver To: elver@google.com, akpm@linux-foundation.org, glider@google.com Cc: hpa@zytor.com, paulmck@kernel.org, andreyknvl@google.com, aryabinin@virtuozzo.com, luto@kernel.org, bp@alien8.de, catalin.marinas@arm.com, cl@linux.com, dave.hansen@linux.intel.com, rientjes@google.com, dvyukov@google.com, edumazet@google.com, gregkh@linuxfoundation.org, mingo@redhat.com, jannh@google.com, Jonathan.Cameron@huawei.com, corbet@lwn.net, iamjoonsoo.kim@lge.com, keescook@chromium.org, mark.rutland@arm.com, penberg@kernel.org, peterz@infradead.org, cai@lca.pw, tglx@linutronix.de, vbabka@suse.cz, will@kernel.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 42E471803F9C3 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 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: Alexander Potapenko We make KFENCE compatible with KASAN for testing KFENCE itself. In particular, KASAN helps to catch any potential corruptions to KFENCE state, or other corruptions that may be a result of freepointer corruptions in the main allocators. To indicate that the combination of the two is generally discouraged, CONFIG_EXPERT=y should be set. It also gives us the nice property that KFENCE will be build-tested by allyesconfig builds. Co-developed-by: Marco Elver Signed-off-by: Marco Elver Signed-off-by: Alexander Potapenko --- lib/Kconfig.kfence | 2 +- mm/kasan/common.c | 7 +++++++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/lib/Kconfig.kfence b/lib/Kconfig.kfence index 6a90fef41832..872bcbdd8cc4 100644 --- a/lib/Kconfig.kfence +++ b/lib/Kconfig.kfence @@ -10,7 +10,7 @@ config HAVE_ARCH_KFENCE_STATIC_POOL menuconfig KFENCE bool "KFENCE: low-overhead sampling-based memory safety error detector" - depends on HAVE_ARCH_KFENCE && !KASAN && (SLAB || SLUB) + depends on HAVE_ARCH_KFENCE && (!KASAN || EXPERT) && (SLAB || SLUB) depends on JUMP_LABEL # To ensure performance, require jump labels select STACKTRACE help diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 950fd372a07e..f5c49f0fdeff 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -396,6 +397,9 @@ static bool __kasan_slab_free(struct kmem_cache *cache, void *object, tagged_object = object; object = reset_tag(object); + if (is_kfence_address(object)) + return false; + if (unlikely(nearest_obj(cache, virt_to_head_page(object), object) != object)) { kasan_report_invalid_free(tagged_object, ip); @@ -444,6 +448,9 @@ static void *__kasan_kmalloc(struct kmem_cache *cache, const void *object, if (unlikely(object == NULL)) return NULL; + if (is_kfence_address(object)) + return (void *)object; + redzone_start = round_up((unsigned long)(object + size), KASAN_SHADOW_SCALE_SIZE); redzone_end = round_up((unsigned long)object + cache->object_size, -- 2.28.0.618.gf4bc123cb7-goog