From patchwork Mon May 6 16:30:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10931401 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2C7CB15A6 for ; Mon, 6 May 2019 16:31:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1BACA287EA for ; Mon, 6 May 2019 16:31:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0CDF728864; Mon, 6 May 2019 16:31:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 735AF287EF for ; Mon, 6 May 2019 16:31:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727009AbfEFQbZ (ORCPT ); Mon, 6 May 2019 12:31:25 -0400 Received: from mail-vs1-f73.google.com ([209.85.217.73]:53688 "EHLO mail-vs1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726982AbfEFQbY (ORCPT ); Mon, 6 May 2019 12:31:24 -0400 Received: by mail-vs1-f73.google.com with SMTP id o15so315109vsr.20 for ; Mon, 06 May 2019 09:31:23 -0700 (PDT) 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=5/U30IDTpMzOZZUHty5OaCehkawNQwuaMdmb1lxJ4Z0=; b=YtLNTr71LQtDtm4+fIzPRqVEmsig4jIZm+5Xq1i7HEuxqe92Fba7UIz0P7LGc/lCae dXG34rcNIps8e/OHQ3Qzc2dw8Q2cw02t5CRXFsyAuFyvOSJWHO7z9kGM+zFce82aoyA3 qtrPznLya17o1jSMBsriB2NxUvL6TNepNcLFNmzdS0xujMY5BYhLZIcZKNLcHkkh0W1L /UJ5RkfdxqJMDgKHhR9weZLpKLMZYLR2mkyZcMWZXKn0tWKezIF4luzZUNs3aAJ9eSxT OA5Tz3eW90ZO6gwE2fYYKkT2xZxlwtZaQj4M4Oni1/3Ul1zlOiWvHRCQ7SYhl4fTWfl6 H0KQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=5/U30IDTpMzOZZUHty5OaCehkawNQwuaMdmb1lxJ4Z0=; b=YGaSF6aHlWHiNZSPEr7NaSelsq3R4vRB71KpuANww/WcFFd13e2vUUqu1/3f/tORFN yVS95J3XohDeiBdZEDetSepwXWSwXMBwwkCSQWc4ahxps5IPTIKwlEphfos/fQ9tHwjR hTFOWeSOi2V9OsYIkQGCHc6CwI2EDM4u11/LY8grNARWNU5ountnUIPe1yMaTK3/us06 a/QtcsomLs5ovnIr2EBFTlimFNIZzeDBfZlrmCWqCb9LSAtBbmnxEfwMOwCOQazRQUMM dJ9b2paha6zrBiSWLlYaCKMY9g59851al4KfixRCIFiqXiqDuc24EfZW59ge3jBwAZ+m noFg== X-Gm-Message-State: APjAAAXjvCRKn1oVsoWtQZT2NEGo25sW2IIKxzXdres0ljcP1SoK8KS9 c30GanMQAdTg++8awZoVQnUXUKyQEYUnLr5p X-Google-Smtp-Source: APXvYqzPcSLCkM7yKRgWAgtLPPmtlxC3d1i0NZJgfFSPt5rWBLpStTcU2VVry9J5XQbhU5Djgso0ZhxSZBobo+In X-Received: by 2002:a67:ed0b:: with SMTP id l11mr13351119vsp.55.1557160282543; Mon, 06 May 2019 09:31:22 -0700 (PDT) Date: Mon, 6 May 2019 18:30:51 +0200 In-Reply-To: Message-Id: <00eb4c63fefc054e2c8d626e8fedfca11d7c2600.1557160186.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog Subject: [PATCH v15 05/17] arms64: untag user pointers passed to memory syscalls 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 Cc: Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Luc Van Oostenryck , Dave Martin , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.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. This patch allows tagged pointers to be passed to the following memory syscalls: brk, get_mempolicy, madvise, mbind, mincore, mlock, mlock2, mmap, mmap_pgoff, mprotect, mremap, msync, munlock, munmap, remap_file_pages, shmat and shmdt. This is done by untagging pointers passed to these syscalls in the prologues of their handlers. Signed-off-by: Andrey Konovalov --- arch/arm64/kernel/sys.c | 128 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 127 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/sys.c b/arch/arm64/kernel/sys.c index b44065fb1616..933bb9f3d6ec 100644 --- a/arch/arm64/kernel/sys.c +++ b/arch/arm64/kernel/sys.c @@ -35,10 +35,33 @@ SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, { if (offset_in_page(off) != 0) return -EINVAL; - + addr = untagged_addr(addr); return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); } +SYSCALL_DEFINE6(arm64_mmap_pgoff, unsigned long, addr, unsigned long, len, + unsigned long, prot, unsigned long, flags, + unsigned long, fd, unsigned long, pgoff) +{ + addr = untagged_addr(addr); + return ksys_mmap_pgoff(addr, len, prot, flags, fd, pgoff); +} + +SYSCALL_DEFINE5(arm64_mremap, unsigned long, addr, unsigned long, old_len, + unsigned long, new_len, unsigned long, flags, + unsigned long, new_addr) +{ + addr = untagged_addr(addr); + new_addr = untagged_addr(new_addr); + return ksys_mremap(addr, old_len, new_len, flags, new_addr); +} + +SYSCALL_DEFINE2(arm64_munmap, unsigned long, addr, size_t, len) +{ + addr = untagged_addr(addr); + return ksys_munmap(addr, len); +} + SYSCALL_DEFINE1(arm64_personality, unsigned int, personality) { if (personality(personality) == PER_LINUX32 && @@ -47,10 +70,113 @@ SYSCALL_DEFINE1(arm64_personality, unsigned int, personality) return ksys_personality(personality); } +SYSCALL_DEFINE1(arm64_brk, unsigned long, brk) +{ + brk = untagged_addr(brk); + return ksys_brk(brk); +} + +SYSCALL_DEFINE5(arm64_get_mempolicy, int __user *, policy, + unsigned long __user *, nmask, unsigned long, maxnode, + unsigned long, addr, unsigned long, flags) +{ + addr = untagged_addr(addr); + return ksys_get_mempolicy(policy, nmask, maxnode, addr, flags); +} + +SYSCALL_DEFINE3(arm64_madvise, unsigned long, start, + size_t, len_in, int, behavior) +{ + start = untagged_addr(start); + return ksys_madvise(start, len_in, behavior); +} + +SYSCALL_DEFINE6(arm64_mbind, unsigned long, start, unsigned long, len, + unsigned long, mode, const unsigned long __user *, nmask, + unsigned long, maxnode, unsigned int, flags) +{ + start = untagged_addr(start); + return ksys_mbind(start, len, mode, nmask, maxnode, flags); +} + +SYSCALL_DEFINE2(arm64_mlock, unsigned long, start, size_t, len) +{ + start = untagged_addr(start); + return ksys_mlock(start, len, VM_LOCKED); +} + +SYSCALL_DEFINE2(arm64_mlock2, unsigned long, start, size_t, len) +{ + start = untagged_addr(start); + return ksys_mlock(start, len, VM_LOCKED); +} + +SYSCALL_DEFINE2(arm64_munlock, unsigned long, start, size_t, len) +{ + start = untagged_addr(start); + return ksys_munlock(start, len); +} + +SYSCALL_DEFINE3(arm64_mprotect, unsigned long, start, size_t, len, + unsigned long, prot) +{ + start = untagged_addr(start); + return ksys_mprotect_pkey(start, len, prot, -1); +} + +SYSCALL_DEFINE3(arm64_msync, unsigned long, start, size_t, len, int, flags) +{ + start = untagged_addr(start); + return ksys_msync(start, len, flags); +} + +SYSCALL_DEFINE3(arm64_mincore, unsigned long, start, size_t, len, + unsigned char __user *, vec) +{ + start = untagged_addr(start); + return ksys_mincore(start, len, vec); +} + +SYSCALL_DEFINE5(arm64_remap_file_pages, unsigned long, start, + unsigned long, size, unsigned long, prot, + unsigned long, pgoff, unsigned long, flags) +{ + start = untagged_addr(start); + return ksys_remap_file_pages(start, size, prot, pgoff, flags); +} + +SYSCALL_DEFINE3(arm64_shmat, int, shmid, char __user *, shmaddr, int, shmflg) +{ + shmaddr = untagged_addr(shmaddr); + return ksys_shmat(shmid, shmaddr, shmflg); +} + +SYSCALL_DEFINE1(arm64_shmdt, char __user *, shmaddr) +{ + shmaddr = untagged_addr(shmaddr); + return ksys_shmdt(shmaddr); +} + /* * Wrappers to pass the pt_regs argument. */ #define sys_personality sys_arm64_personality +#define sys_mmap_pgoff sys_arm64_mmap_pgoff +#define sys_mremap sys_arm64_mremap +#define sys_munmap sys_arm64_munmap +#define sys_brk sys_arm64_brk +#define sys_get_mempolicy sys_arm64_get_mempolicy +#define sys_madvise sys_arm64_madvise +#define sys_mbind sys_arm64_mbind +#define sys_mlock sys_arm64_mlock +#define sys_mlock2 sys_arm64_mlock2 +#define sys_munlock sys_arm64_munlock +#define sys_mprotect sys_arm64_mprotect +#define sys_msync sys_arm64_msync +#define sys_mincore sys_arm64_mincore +#define sys_remap_file_pages sys_arm64_remap_file_pages +#define sys_shmat sys_arm64_shmat +#define sys_shmdt sys_arm64_shmdt asmlinkage long sys_ni_syscall(const struct pt_regs *); #define __arm64_sys_ni_syscall sys_ni_syscall