Message ID | e12d6b5008f63b530d25ad73b2e3491939005c22.1552679409.git.andreyknvl@google.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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[209.85.220.73]) by mx.google.com with SMTPS id h74sor537782ywa.130.2019.03.15.12.52.03 for <linux-mm@kvack.org> (Google Transport Security); Fri, 15 Mar 2019 12:52:03 -0700 (PDT) Received-SPF: pass (google.com: domain of 3ygkmxaokciefsiwj3ps0qlttlqj.htrqnsz2-rrp0fhp.twl@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="vzUF5/hV"; spf=pass (google.com: domain of 3ygkmxaokciefsiwj3ps0qlttlqj.htrqnsz2-rrp0fhp.twl@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) smtp.mailfrom=3YgKMXAoKCIEfsiwj3ps0qlttlqj.htrqnsz2-rrp0fhp.twl@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=z/lbJIk5a8zt10jywFDNy5ZdetbtZxhqc2S4ejPNJ3g=; b=vzUF5/hV3N6LymY3D+bJBpSatNRK6fXpwnZa/1KVNOg7xeGxEXTPkbw+wbEOfgpNDR np5G4rL7T1cd+Sz5iJ0RCOtU4P6bLZVS0l14Aq6zvISFR6mzBUWQWKFDoL13DmN3dbM+ SpIGClyUMZd9169+i8j5m3A6jrJ+Hyb10rwBPEQoaeyLAtm17DlPNuWH2RVG7xX1Y6TF 9LKSfozE1SWXebNzzat2ugJn18cSW7bw5YZG+7kazfWFB4UEOKlKg3watEf4bHP24M7o 9DP2o8Vqy0brwdDfGOvD+zN5V6FQV40T4Y8K+j9OS7OnApB4pexBW7Q518EArWyVitEY H6yw== X-Google-Smtp-Source: APXvYqzi5LEkko6ByM4uqeA/ILUmpPQs4A8NqtI2/DdkNKEbP39lGUp9icnx2HlBixyjeGCue9FZGuIPU0jeuK+1 X-Received: by 2002:a81:8a46:: with SMTP id a67mr2389102ywg.26.1552679522975; Fri, 15 Mar 2019 12:52:02 -0700 (PDT) Date: Fri, 15 Mar 2019 20:51:30 +0100 In-Reply-To: <cover.1552679409.git.andreyknvl@google.com> Message-Id: <e12d6b5008f63b530d25ad73b2e3491939005c22.1552679409.git.andreyknvl@google.com> Mime-Version: 1.0 References: <cover.1552679409.git.andreyknvl@google.com> X-Mailer: git-send-email 2.21.0.360.g471c308f928-goog Subject: [PATCH v11 06/14] fs, arm64: untag user pointers in copy_mount_options From: Andrey Konovalov <andreyknvl@google.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Mark Rutland <mark.rutland@arm.com>, Robin Murphy <robin.murphy@arm.com>, Kees Cook <keescook@chromium.org>, Kate Stewart <kstewart@linuxfoundation.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@kernel.org>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, Shuah Khan <shuah@kernel.org>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Eric Dumazet <edumazet@google.com>, "David S. Miller" <davem@davemloft.net>, Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>, Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Arnaldo Carvalho de Melo <acme@kernel.org>, 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 <dvyukov@google.com>, Kostya Serebryany <kcc@google.com>, Evgeniy Stepanov <eugenis@google.com>, Lee Smith <Lee.Smith@arm.com>, Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>, Jacob Bramley <Jacob.Bramley@arm.com>, Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>, Chintan Pandya <cpandya@codeaurora.org>, Luc Van Oostenryck <luc.vanoostenryck@gmail.com>, Dave Martin <Dave.Martin@arm.com>, Kevin Brodsky <kevin.brodsky@arm.com>, Szabolcs Nagy <Szabolcs.Nagy@arm.com>, Andrey Konovalov <andreyknvl@google.com> 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: <linux-mm.kvack.org> X-Virus-Scanned: ClamAV using ClamSMTP |
Series |
arm64: untag user pointers passed to the kernel
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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;
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 <andreyknvl@google.com> --- fs/namespace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)