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s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=TZHV8An4OEXfkqFgrZuDjdlNeU7w3PdkPz1ZU4+cbAs=; b=A/rGmloHahxEAEdIA1p5bzTtLqNn84mW0+TukJqBscktXUHDaYT/UCcwJSHY/RMBg9 gdQMutWYix9zMKH14zo7JoNiuohZcjeebMhDei6DAZWiMtR8zpuSvwexD/MV+z0anQs8 WrDGDR5N4RDKSG9bz0Dq0cFKtTDrSkGPlBOCcvicVx4TZQJY+lg55R+cnl7VIxYKzuqB 7XOoS/PVPcTVwUf6w3iVGiIPXJmjyoNx6cscmfpc+UWkTEFPw2K0mqVVzfI7QaRvWIhS GnljQyaeuPvoXDbZxDZqWtsH3iZyrBqnLV5N5vt8yQ6cPFqjeXiOJkukoEU/DKjZEN2p JHKQ== X-Gm-Message-State: APjAAAW0sv3SDg4SEyO/ikJVpWdSewFHYvU51b9nW9LQGvR9QYi7XwQa VSPhTjzVHyOfQM1NL2HWHKhSfHUrESK+oU5sFIaN0PzQo44y4bzftLF8AC6WTPDlM1AYmi2Vggl iyMnNEiT30TaBfHIE+Tqye/CFSdDY39QaVgLWcVspOVCEfUg/pkIRn6TZ/6+8AfeewmmyvBteBz 0D0P6Udqdwo5oLNOk= X-Google-Smtp-Source: APXvYqzHIfoRqtGD9gbf6U+p/ZZcVtiOU3rLeCD3rrtZumSW95xfAvgD6n9pasKaBp9DQWdRwfRV+d2riHaf6boR X-Received: by 2002:a0c:d449:: with SMTP id r9mr16625749qvh.223.1557160288557; Mon, 06 May 2019 09:31:28 -0700 (PDT) Date: Mon, 6 May 2019 18:30:53 +0200 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog Subject: [PATCH v15 07/17] mm, arm64: untag user pointers in mm/gup.c From: Andrey Konovalov To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190506_093131_593450_B95FC764 X-CRM114-Status: GOOD ( 12.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Szabolcs Nagy , Catalin Marinas , Will Deacon , Kostya Serebryany , Felix Kuehling , Vincenzo Frascino , Jacob Bramley , Leon Romanovsky , Dave Martin , Evgeniy Stepanov , Kevin Brodsky , Kees Cook , Ruben Ayrapetyan , Andrey Konovalov , Lee Smith , Alex Williamson , Mauro Carvalho Chehab , Dmitry Vyukov , Greg Kroah-Hartman , Yishai Hadas , Jens Wiklander , Ramana Radhakrishnan , Alexander Deucher , Andrew Morton , Robin Murphy , Christian Koenig , Luc Van Oostenryck Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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. mm/gup.c provides a kernel interface that accepts user addresses and manipulates user pages directly (for example get_user_pages, that is used by the futex syscall). Since a user can provided tagged addresses, we need to handle this case. Add untagging to gup.c functions that use user addresses for vma lookups. Signed-off-by: Andrey Konovalov Reviewed-by: Catalin Marinas --- mm/gup.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/gup.c b/mm/gup.c index 91819b8ad9cc..2f477a0a7180 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -696,6 +696,8 @@ static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, if (!nr_pages) return 0; + start = untagged_addr(start); + VM_BUG_ON(!!pages != !!(gup_flags & FOLL_GET)); /* @@ -858,6 +860,8 @@ int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, struct vm_area_struct *vma; vm_fault_t ret, major = 0; + address = untagged_addr(address); + if (unlocked) fault_flags |= FAULT_FLAG_ALLOW_RETRY;