From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 34017C43613 for ; Mon, 24 Jun 2019 14:34:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 02AA0208E4 for ; Mon, 24 Jun 2019 14:34:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="WUmcuISq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729083AbfFXOdT (ORCPT ); Mon, 24 Jun 2019 10:33:19 -0400 Received: from mail-vs1-f73.google.com ([209.85.217.73]:51648 "EHLO mail-vs1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729044AbfFXOdR (ORCPT ); Mon, 24 Jun 2019 10:33:17 -0400 Received: by mail-vs1-f73.google.com with SMTP id b7so3916713vsr.18 for ; Mon, 24 Jun 2019 07:33:17 -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=Js+Uq+QN1sbXUiaVQRwOsU0mf+gtz1j4mv8k/PcURo8=; b=WUmcuISq69GG5fXOV16ZRYbJqbX03QewrhmWUSnfmneQQxv/bVXoBYPmdDkptO+OQH 1/ri/E5A/vk+WVGJL91rAId5SPbwcU1J+GEX05oiT/FBX3QCL2+VhrCx25laQbj3KnwW 0uir1QyGoqb8aJtY+XhjApiqZ1TV2sygux6c5i3/wTSx5YjlviAMiL6rDgYCbrfWKKhP SKObpS/Kb5KcFQF3GiBdDIn+XXk54+4aDsioVtDEbCgrm2teMCuqY10Jw19vQvkqN0a9 +wn60o1NBQ+srPpd9cks85wQk+N4yLFGZhxIXnCiqlOqaI9rp4YIg/Ppw4BnZH2jTZPF nKRw== 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=Js+Uq+QN1sbXUiaVQRwOsU0mf+gtz1j4mv8k/PcURo8=; b=H74TOCvJBTMHsagTfn1bgiJH7Ji1OmJTvYZ+pBFVtL30HV1XSFkM+LvFo+Sjff8+O4 v4fLZPqImacePfalqSG6NIyonRv6OA1RFGAzvmEULvY1OOG8CnJ8uUpPxy/wboQxIvWA Av+LTV1C/zjpV5/k+8LSzEVhfX/531gFiXYRdLDPGR8+qzd/8mutKngj5RXeIVYuVPXA EIAgSMhjzcrszuiWPro0tew5EwMo4JtOFGed3vT7JREbXaIb7avwQF4S5iv0lyoDtNCV fPr4XtTDoz0w72UBmBACKUjykWCkVm3594KazjlVWrB1HxKanRfVijzcgn8OPuqn5IbT PAdw== X-Gm-Message-State: APjAAAURTh/S/lkY52hYZMPKgcBDaHTO41Zd3RA0jAbYwM0Tf/dWB25h +mvOuzf5CL/GbNgJXPll+5jXjqd6Rr7M5pgG X-Google-Smtp-Source: APXvYqyg4WJnk6EUjTU/KUznHgpngcCHVd+yKoydagOLQxGVZUbXzn8R7RbZiNlfqU2taVShyYtDXoa3laNIqrwD X-Received: by 2002:a67:fc19:: with SMTP id o25mr17948112vsq.106.1561386796805; Mon, 24 Jun 2019 07:33:16 -0700 (PDT) Date: Mon, 24 Jun 2019 16:32:49 +0200 In-Reply-To: Message-Id: <387274fe8ecad41a73aec347fe24682b633a8147.1561386715.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog Subject: [PATCH v18 04/15] mm: 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 , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov Content-Type: text/plain; charset="UTF-8" Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch is a part of a series that extends 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: get_mempolicy, madvise, mbind, mincore, mlock, mlock2, mprotect, mremap, msync, munlock, move_pages. The mmap and mremap syscalls do not currently accept tagged addresses. Architectures may interpret the tag as a background colour for the corresponding vma. Reviewed-by: Khalid Aziz Reviewed-by: Vincenzo Frascino Reviewed-by: Catalin Marinas Reviewed-by: Kees Cook Signed-off-by: Andrey Konovalov --- mm/madvise.c | 2 ++ mm/mempolicy.c | 3 +++ mm/migrate.c | 2 +- mm/mincore.c | 2 ++ mm/mlock.c | 4 ++++ mm/mprotect.c | 2 ++ mm/mremap.c | 7 +++++++ mm/msync.c | 2 ++ 8 files changed, 23 insertions(+), 1 deletion(-) diff --git a/mm/madvise.c b/mm/madvise.c index 628022e674a7..39b82f8a698f 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -810,6 +810,8 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior) size_t len; struct blk_plug plug; + start = untagged_addr(start); + if (!madvise_behavior_valid(behavior)) return error; diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 01600d80ae01..78e0a88b2680 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1360,6 +1360,7 @@ static long kernel_mbind(unsigned long start, unsigned long len, int err; unsigned short mode_flags; + start = untagged_addr(start); mode_flags = mode & MPOL_MODE_FLAGS; mode &= ~MPOL_MODE_FLAGS; if (mode >= MPOL_MAX) @@ -1517,6 +1518,8 @@ static int kernel_get_mempolicy(int __user *policy, int uninitialized_var(pval); nodemask_t nodes; + addr = untagged_addr(addr); + if (nmask != NULL && maxnode < nr_node_ids) return -EINVAL; diff --git a/mm/migrate.c b/mm/migrate.c index f2ecc2855a12..d22c45cf36b2 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1616,7 +1616,7 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, goto out_flush; if (get_user(node, nodes + i)) goto out_flush; - addr = (unsigned long)p; + addr = (unsigned long)untagged_addr(p); err = -ENODEV; if (node < 0 || node >= MAX_NUMNODES) diff --git a/mm/mincore.c b/mm/mincore.c index c3f058bd0faf..64c322ed845c 100644 --- a/mm/mincore.c +++ b/mm/mincore.c @@ -249,6 +249,8 @@ SYSCALL_DEFINE3(mincore, unsigned long, start, size_t, len, unsigned long pages; unsigned char *tmp; + start = untagged_addr(start); + /* Check the start address: needs to be page-aligned.. */ if (start & ~PAGE_MASK) return -EINVAL; diff --git a/mm/mlock.c b/mm/mlock.c index a90099da4fb4..a72c1eeded77 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -674,6 +674,8 @@ static __must_check int do_mlock(unsigned long start, size_t len, vm_flags_t fla unsigned long lock_limit; int error = -ENOMEM; + start = untagged_addr(start); + if (!can_do_mlock()) return -EPERM; @@ -735,6 +737,8 @@ SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len) { int ret; + start = untagged_addr(start); + len = PAGE_ALIGN(len + (offset_in_page(start))); start &= PAGE_MASK; diff --git a/mm/mprotect.c b/mm/mprotect.c index bf38dfbbb4b4..19f981b733bc 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -465,6 +465,8 @@ static int do_mprotect_pkey(unsigned long start, size_t len, const bool rier = (current->personality & READ_IMPLIES_EXEC) && (prot & PROT_READ); + start = untagged_addr(start); + prot &= ~(PROT_GROWSDOWN|PROT_GROWSUP); if (grows == (PROT_GROWSDOWN|PROT_GROWSUP)) /* can't be both */ return -EINVAL; diff --git a/mm/mremap.c b/mm/mremap.c index fc241d23cd97..64c9a3b8be0a 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -606,6 +606,13 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, LIST_HEAD(uf_unmap_early); LIST_HEAD(uf_unmap); + /* + * Architectures may interpret the tag passed to mmap as a background + * colour for the corresponding vma. For mremap we don't allow tagged + * new_addr to preserve similar behaviour to mmap. + */ + addr = untagged_addr(addr); + if (flags & ~(MREMAP_FIXED | MREMAP_MAYMOVE)) return ret; diff --git a/mm/msync.c b/mm/msync.c index ef30a429623a..c3bd3e75f687 100644 --- a/mm/msync.c +++ b/mm/msync.c @@ -37,6 +37,8 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags) int unmapped_error = 0; int error = -EINVAL; + start = untagged_addr(start); + if (flags & ~(MS_ASYNC | MS_INVALIDATE | MS_SYNC)) goto out; if (offset_in_page(start)) -- 2.22.0.410.gd8fdbe21b5-goog