From patchwork Tue Apr 30 13:25:01 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10923469 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 5D377933 for ; Tue, 30 Apr 2019 13:25:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4AB99285EB for ; Tue, 30 Apr 2019 13:25:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3E55828A63; Tue, 30 Apr 2019 13:25:38 +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 A4D2B2860A for ; Tue, 30 Apr 2019 13:25:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728272AbfD3NZf (ORCPT ); Tue, 30 Apr 2019 09:25:35 -0400 Received: from mail-qt1-f202.google.com ([209.85.160.202]:52173 "EHLO mail-qt1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728214AbfD3NZe (ORCPT ); Tue, 30 Apr 2019 09:25:34 -0400 Received: by mail-qt1-f202.google.com with SMTP id i38so9263260qte.18 for ; Tue, 30 Apr 2019 06:25:33 -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=sP41vSza+MgZL4E9JOHZR6SNiiwo3z4wqXp2POej+GY=; b=sj70XUZyY78fBBLRN0Y0ejY13Ah+DWSq5MZvdtC4oy13cP3DTQDgLFkcENh07spfmR 23eMW0ICrpgPZePCfs+0BA1gHPdG5T6uXrEWd81Tbha8dBRDM5Df4bgp8ypNTHmZGxhB zSa9r+Rp6W+STnkRdeIoDVRh7qzf6mRVz3aHnzxLBAlwWCR6kWuFgAJ4CJMcjRmxd08s WnsYITF9lzQXqyZYteDI696ABzkYAJcaC1sR3amNrgXWNyCgGFhtLoxDguJqocrpZ4Uy mOYkJ3BstUbrdtjiLHmZC47MGFm370/x5FYq0YwcLbrA00fWtbMhOMLHm2kOb5VLfvHU R2IA== 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=sP41vSza+MgZL4E9JOHZR6SNiiwo3z4wqXp2POej+GY=; b=fT/g3NIpaFU1ULOGrmIRp8uhb3DrsjpFV62WYhD2rtPD9T1cZfAo80FNgBPfQ76fI8 hM/uzPgDVdj7ofQ3BqE1G4CPP6pPN0B4RURp7paIKGJ8ikKvGz0LeBcUql8R5zP3+OxO rorGESOIWzGOsY3VDzKCmSWVYRt1IaNvK010Wah1goFLVxEjPL0Il1eFtjOFE68sJA2r msJphcffBoVCmaSrdp6Gth/nc23ym6+xGzFNi6TdgDW8X5GPLL2YMLFrS5TuAW8RqGaG x3mpNdrj3RqMuQFSLhlTuZvkS+rXskgkZDnZOwklBWgpHFt7hgZ+YXy7wlenCBLffPKB EJAQ== X-Gm-Message-State: APjAAAVXHrVO84qMh7PexkuiW7eW4UfwVs1Rrp/vzgxQGZmWZYKcoKpw uT8e2XWIuTSBCvikMK7+zFjfndAccRCXtPw7 X-Google-Smtp-Source: APXvYqwOIvRkWypSUt5RnFMU33k3VTnn9YbxJDW32+qwnbYJck7Qr3YzoF+bGVldwhSnM3lKHenrz7Th7S5LU/LL X-Received: by 2002:ac8:186e:: with SMTP id n43mr29405979qtk.69.1556630732994; Tue, 30 Apr 2019 06:25:32 -0700 (PDT) Date: Tue, 30 Apr 2019 15:25:01 +0200 In-Reply-To: Message-Id: <9b9c21f2895b1dfd7079572ea6d9d4fd6b5bbc55.1556630205.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.593.g511ec345e18-goog Subject: [PATCH v14 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 , Kuehling@google.com, Felix , Deucher@google.com, Alexander , Koenig@google.com, Christian , 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 , Chintan Pandya , Luc Van Oostenryck , Dave Martin , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@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