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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=QC9NTo7nxtZYJpQO/i/DXWRBIzGZiJeRrgmmIrmcLsY=; b=QFG9l+rV1dC65GtX1R67npkRMiA43Be7/uSg0S4iRzy2JbK3ta7X54d91bjBmOLjtV Ac9Iuuy9WKsZYCoVSnbvMByirsVOMNRH5K9tOr6ozXUA0zMiz+bIX0NIyQFKbOw6S7mG qi9/trV1gdqbbrd2mn9x9NLCuch8Qf736+L50tKpniFR9pzxUTVJBXVEUvnLXQi5aeuo VtDR82flKgl+ypQUJ8ZNqOLbLgBc3vGX8aKA/9dgM+0mDmCJfulfPlsIUOxmkAZ0XJrQ H2qwOrkIcq4uHAgwlMXEUKZVKPrWviTaYfJCZnrqvMa+zVgpGj5U/eBLf8N3EZP0+qRu hYhQ== X-Gm-Message-State: AOAM533xeCxENKDwGnxk4wroEiNEsBotIXSNiVbcY0qnSaoU+GFxBJFV khOtg6vzCNjBmfxWRB6uONOg02z2zw== X-Google-Smtp-Source: ABdhPJwfBXSFasOjomiIxo9IXspK1cNnb4LrYot1/kxO1J7dSMNEmNNlULqP5o8LlWMBrqdqJrkBo5GUVQ== X-Received: from elver.muc.corp.google.com ([2a00:79e0:15:13:f693:9fff:fef4:2449]) (user=elver job=sendgmr) by 2002:a5d:6551:: with SMTP id z17mr20816665wrv.200.1599486089420; Mon, 07 Sep 2020 06:41:29 -0700 (PDT) Date: Mon, 7 Sep 2020 15:40:53 +0200 In-Reply-To: <20200907134055.2878499-1-elver@google.com> Message-Id: <20200907134055.2878499-9-elver@google.com> Mime-Version: 1.0 References: <20200907134055.2878499-1-elver@google.com> X-Mailer: git-send-email 2.28.0.526.ge36021eeef-goog Subject: [PATCH RFC 08/10] kfence, lockdep: make KFENCE compatible with lockdep From: Marco Elver To: elver@google.com, glider@google.com, akpm@linux-foundation.org, catalin.marinas@arm.com, cl@linux.com, rientjes@google.com, iamjoonsoo.kim@lge.com, mark.rutland@arm.com, penberg@kernel.org Cc: hpa@zytor.com, paulmck@kernel.org, andreyknvl@google.com, aryabinin@virtuozzo.com, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, dvyukov@google.com, edumazet@google.com, gregkh@linuxfoundation.org, mingo@redhat.com, jannh@google.com, corbet@lwn.net, keescook@chromium.org, peterz@infradead.org, cai@lca.pw, tglx@linutronix.de, 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: 1DF5E10040F21 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 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: Lockdep checks that dynamic key registration is only performed on keys that are not static objects. With KFENCE, it is possible that such a dynamically allocated key is a KFENCE object which may, however, be allocated from a static memory pool (if HAVE_ARCH_KFENCE_STATIC_POOL). Therefore, ignore KFENCE-allocated objects in static_obj(). Co-developed-by: Alexander Potapenko Signed-off-by: Alexander Potapenko Signed-off-by: Marco Elver --- kernel/locking/lockdep.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 54b74fabf40c..0cf5d5ecbd31 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include #include @@ -755,6 +756,13 @@ static int static_obj(const void *obj) if (arch_is_kernel_initmem_freed(addr)) return 0; + /* + * KFENCE objects may be allocated from a static memory pool, but are + * not actually static objects. + */ + if (is_kfence_address(obj)) + return 0; + /* * static variable? */ -- 2.28.0.526.ge36021eeef-goog