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[209.85.220.73]) by mx.google.com with SMTPS id 34sor12593959qte.45.2019.03.18.10.18.07 for (Google Transport Security); Mon, 18 Mar 2019 10:18:07 -0700 (PDT) Received-SPF: pass (google.com: domain of 3z9kpxaokcj48lbpcwiltjemmejc.amkjglsv-kkit8ai.mpe@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) client-ip=209.85.220.73; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=ZmesG1+v; spf=pass (google.com: domain of 3z9kpxaokcj48lbpcwiltjemmejc.amkjglsv-kkit8ai.mpe@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) smtp.mailfrom=3z9KPXAoKCJ48LBPCWILTJEMMEJC.AMKJGLSV-KKIT8AI.MPE@flex--andreyknvl.bounces.google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=/AfMcWXUpr8qOV9jNlH+KOvJdLIB2O2rWZvj+eGhaHk=; b=ZmesG1+vdfvVJVysloZ/DvNyAHwl1NeoVDeZqmznyOpJWfePQRGjlMOaVKfDpQrgzs J2EQbjkMYChUC5zNqacIMsL4hIDlSJ8LlP4Fmv1sBUKWq1gONhy9n6WlIdgh6miGrDT+ kxO+pObNRxAVLj1qO6umMp4FBt4KoE0pcjnUi2zV7lJYuNIAUHoun/OybTmy1PNaA5yQ p3eG+Dhv94MxYowpcID5/Yi84v5cik+7L0zhfsc+N+0vCh3BkkQf0oPyRfu2qOWqEfLW 2tCSF4/OHp/EYgkB0s7TOad99Oui2rlmLjv/5KNArBSNE7FFiFH/+uNURIDaDJj0/jzV BjkQ== X-Google-Smtp-Source: APXvYqzQcEeEWS2cRarzaICPGg9P+n5KYCEBV6zZ1LX2+H91hhlcnbntbKdJigMJk6uOOiOh4IgPE1iT+lDz1l6o X-Received: by 2002:ac8:2733:: with SMTP id g48mr11081110qtg.0.1552929487390; Mon, 18 Mar 2019 10:18:07 -0700 (PDT) Date: Mon, 18 Mar 2019 18:17:38 +0100 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.225.g810b269d1ac-goog Subject: [PATCH v12 06/13] fs, arm64: untag user pointers in copy_mount_options From: Andrey Konovalov To: Catalin Marinas , Will Deacon , Mark Rutland , Robin Murphy , Kees Cook , Kate Stewart , Greg Kroah-Hartman , Andrew Morton , Ingo Molnar , "Kirill A . Shutemov" , Shuah Khan , Vincenzo Frascino , Eric Dumazet , "David S. Miller" , Alexei Starovoitov , Daniel Borkmann , Steven Rostedt , Ingo Molnar , Peter Zijlstra , Arnaldo Carvalho de Melo , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Chintan Pandya , Luc Van Oostenryck , Dave Martin , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov Content-Type: text/plain; charset="UTF-8" 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: This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. In copy_mount_options a user address is being subtracted from TASK_SIZE. If the address is lower than TASK_SIZE, the size is calculated to not allow the exact_copy_from_user() call to cross TASK_SIZE boundary. However if the address is tagged, then the size will be calculated incorrectly. Untag the address before subtracting. Signed-off-by: Andrey Konovalov --- fs/namespace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/namespace.c b/fs/namespace.c index c9cab307fa77..c27e5713bf04 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -2825,7 +2825,7 @@ void *copy_mount_options(const void __user * data) * the remainder of the page. */ /* copy_from_user cannot cross TASK_SIZE ! */ - size = TASK_SIZE - (unsigned long)data; + size = TASK_SIZE - (unsigned long)untagged_addr(data); if (size > PAGE_SIZE) size = PAGE_SIZE; -- 2.21.0.225.g810b269d1ac-goog