From patchwork Wed Oct 23 16:24:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Stoakes X-Patchwork-Id: 13847468 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1DA73CFA44F for ; Wed, 23 Oct 2024 16:25:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id DF70D6B008C; Wed, 23 Oct 2024 12:25:22 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D851F6B0092; Wed, 23 Oct 2024 12:25:22 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B363A6B0095; Wed, 23 Oct 2024 12:25:22 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 8839F6B008C for ; Wed, 23 Oct 2024 12:25:22 -0400 (EDT) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 60F7A120CF1 for ; Wed, 23 Oct 2024 16:25:06 +0000 (UTC) X-FDA: 82705391538.23.A0F5B3C Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by imf13.hostedemail.com (Postfix) with ESMTP id E62E02000F for ; Wed, 23 Oct 2024 16:25:00 +0000 (UTC) Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2023-11-20 header.b="n/YigyHe"; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=il+Yr2wK; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf13.hostedemail.com: domain of lorenzo.stoakes@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=lorenzo.stoakes@oracle.com; dmarc=pass (policy=reject) header.from=oracle.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1729700567; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=vgEdRzLyuHzc2anBjPO5zTNYgSoqG4gc63FTV4U/xUA=; b=fSGcRfIicivMtRGUnKvykVo/zhQeBSrpuzM7EPtYix6nnFbV6SmMsyLNJGLW/GLnZDD3l8 n/Me4UohKKvV2JkLvA4A1ALWMLiN9MMr5rJDx3MHDIDEZb/GQMfylZ/v6KcDtmJ9PlGnKX tYzKrtNZJrB8ClOrUtnv5xAm2SHMzO4= ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1729700567; a=rsa-sha256; cv=pass; b=cjkUG+27/BgVNiOB4BUhGH6wwUt5YHT4KnY6GcVON1Lpvv4rLX5qidmX/vzgInCRlZHcpw dgTs2ZIcgOlsNIusvcpLCbXgX0dZHF8wkIoPk96S1cmRnXuymEpXKI4O4Mn+2q8uwIq93p ZqlIc3T1luHc0swiI0vH16FiNGWOy7s= ARC-Authentication-Results: i=2; imf13.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2023-11-20 header.b="n/YigyHe"; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=il+Yr2wK; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf13.hostedemail.com: domain of lorenzo.stoakes@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=lorenzo.stoakes@oracle.com; dmarc=pass (policy=reject) header.from=oracle.com Received: from pps.filterd (m0333521.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 49NFfdNc012074; Wed, 23 Oct 2024 16:25:05 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s= corp-2023-11-20; bh=vgEdRzLyuHzc2anBjPO5zTNYgSoqG4gc63FTV4U/xUA=; b= n/YigyHeHBmU0VBwkUHxF61nZrAa5YKBaJCjyY9FxypkN1DplIpDT8Lu5Tpvrkzj c6fC32RbyvhTL8H+YEpGmtyt3dn+5qE4NXzi37Kt0K1lzH0J1F6zNprCnrcQ5oKY HRMKVZPLJfzg4581SSzjfyd07CNQmBnujCCV0ht2jZKfXjUPorBJIcJwnBquDB4w AfdV0BtRzBKWgn364sj7tIbSyoD9Xhhf/zZaayYL81YI18/U3lHUiaY8g8wy61hR wIa0rLDaGYYQZhyCT5akaD1tIb0ksOxaI3hQZsRjB5Ih6DHyBRDETF0SezB/U99I dCXHbuL4SpogNZTnVl4qzw== Received: from iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta01.appoci.oracle.com [130.35.100.223]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 42c53urht2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 23 Oct 2024 16:25:05 +0000 (GMT) Received: from pps.filterd (iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 49NFc3C7027408; Wed, 23 Oct 2024 16:25:04 GMT Received: from nam10-dm6-obe.outbound.protection.outlook.com (mail-dm6nam10lp2046.outbound.protection.outlook.com [104.47.58.46]) by iadpaimrmta01.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 42emh3290n-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 23 Oct 2024 16:25:03 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=wL4T7bcg7vvyYohT0I3q2j3qOV1sEqjt8KIICAYnmxqovP+iy4e1unetTPmyKCFxAxbqnBkkQtN9s9NLGsDomUbkDyBwMdxG3dzcuZn6e8/pfQfbD70MBej1zjnVQsmMYRCFJ5TaYH6QeRRHeilQIb9B84LGRx7OELFTjkMTxGi/O2nxcLV/jd/eacNCWbzXloabT51EVoWBZ1UjTd9smj6bzDYvfnw0Ms1HfsTnTX4+IYJw4AzruPOC063CRWvT+RVKM42DBTP+/CRe3SdSWgssEi+xKEdxhhNaBEqIAOE+GQrCTiDhY8RZL6rYbb/O+EbawoosMXrZUpzLRkaGSA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=vgEdRzLyuHzc2anBjPO5zTNYgSoqG4gc63FTV4U/xUA=; b=PRCj+QnLwufyIjD/WV3tzq37rdlSZY6NEKKQg8yWUt2eqIB9IUvnPx5BwJZTX2COABoIfrXwGTENJb116SevEOHW2B9PC4ecq+PffhFwAmRE7E5JVrQrROUfAc1OL199Dk5asE4OHcw/BpQ3C7rS1VV/qCIP5u1+fB2q+L7+l/dqTjvKDuHvvwBzfTuCwclO3YvEjTdoG5PvUnofW7wxxSc1EiVr8NhAmXb+foGWXjydlszuuOCP0AbDQ8C1060oJd1QXrZSJrT4vDl3mH2VkHM+DjizgPf7VHFB+0MtZI1gcULVraz645/SQJg/YrESmLNj3DwLx/9tzOcruEHHcA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=vgEdRzLyuHzc2anBjPO5zTNYgSoqG4gc63FTV4U/xUA=; b=il+Yr2wKdX3gnLiD6jmSWWK7vZTjCRqYmpyfOawlCnfyKVp3VeypB9ZpMU7W3aXqS1SMkaG5YGItC7R7k/KxpVupVw7cklVt7UQt3hPVgq3dEBh6kaFxABJLCryokd0qU95zBxVAvd+Zw4xSgY2KIsRdmRVmxhQmxVEHohT8zKk= Received: from BYAPR10MB3366.namprd10.prod.outlook.com (2603:10b6:a03:14f::25) by CH3PR10MB6836.namprd10.prod.outlook.com (2603:10b6:610:14f::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8093.16; Wed, 23 Oct 2024 16:25:00 +0000 Received: from BYAPR10MB3366.namprd10.prod.outlook.com ([fe80::baf2:dff1:d471:1c9]) by BYAPR10MB3366.namprd10.prod.outlook.com ([fe80::baf2:dff1:d471:1c9%6]) with mapi id 15.20.8069.024; Wed, 23 Oct 2024 16:25:00 +0000 From: Lorenzo Stoakes To: Andrew Morton Cc: Suren Baghdasaryan , "Liam R . Howlett" , Matthew Wilcox , Vlastimil Babka , "Paul E . McKenney" , Jann Horn , David Hildenbrand , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Muchun Song , Richard Henderson , Matt Turner , Thomas Bogendoerfer , "James E . J . Bottomley" , Helge Deller , Chris Zankel , Max Filippov , Arnd Bergmann , linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-arch@vger.kernel.org, Shuah Khan , Christian Brauner , linux-kselftest@vger.kernel.org, Sidhartha Kumar , Jeff Xu , Christoph Hellwig , linux-api@vger.kernel.org, John Hubbard Subject: [PATCH v3 2/5] mm: add PTE_MARKER_GUARD PTE marker Date: Wed, 23 Oct 2024 17:24:39 +0100 Message-ID: <7f81287792eef318a7a711d358c00e2e48216f15.1729699916.git.lorenzo.stoakes@oracle.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: References: X-ClientProxiedBy: LO2P265CA0070.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:60::34) To BYAPR10MB3366.namprd10.prod.outlook.com (2603:10b6:a03:14f::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR10MB3366:EE_|CH3PR10MB6836:EE_ X-MS-Office365-Filtering-Correlation-Id: 465955cd-aa31-4d31-2167-08dcf37f3dd2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|10070799003|376014|7416014|1800799024|366016; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR10MB3366.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(10070799003)(376014)(7416014)(1800799024)(366016);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 465955cd-aa31-4d31-2167-08dcf37f3dd2 X-MS-Exchange-CrossTenant-AuthSource: BYAPR10MB3366.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Oct 2024 16:25:00.7223 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: KkLlTFvSNpT8HvhgISLYs3a2YAu+JAD0dRTWH1XuxwaG4ih3sKM0b2oSWfDSm/NnSK3hEjirM+TRGXxIOoFlpy3/Q4UnanEEFImvHKsUZIs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR10MB6836 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-23_13,2024-10-23_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 phishscore=0 malwarescore=0 adultscore=0 mlxscore=0 mlxlogscore=999 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2409260000 definitions=main-2410230095 X-Proofpoint-GUID: Qo3N_ypuxQvQZShNx9GUNmFG4Foq13m5 X-Proofpoint-ORIG-GUID: Qo3N_ypuxQvQZShNx9GUNmFG4Foq13m5 X-Rspamd-Queue-Id: E62E02000F X-Stat-Signature: boqegdnapp4bjhb64dnyk1b9ycj1e5sf X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1729700700-517430 X-HE-Meta: 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 HNi7tB96 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 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: List-Subscribe: List-Unsubscribe: Add a new PTE marker that results in any access causing the accessing process to segfault. This is preferable to PTE_MARKER_POISONED, which results in the same handling as hardware poisoned memory, and is thus undesirable for cases where we simply wish to 'soft' poison a range. This is in preparation for implementing the ability to specify guard pages at the page table level, i.e. ranges that, when accessed, should cause process termination. Additionally, rename zap_drop_file_uffd_wp() to zap_drop_markers() - the function checks the ZAP_FLAG_DROP_MARKER flag so naming it for this single purpose was simply incorrect. We then reuse the same logic to determine whether a zap should clear a guard entry - this should only be performed on teardown and never on MADV_DONTNEED or MADV_FREE. We additionally add a WARN_ON_ONCE() in hugetlb logic should a guard marker be encountered there, as we explicitly do not support this operation and this should not occur. Acked-by: Vlastimil Babka Signed-off-by: Lorenzo Stoakes Acked-by: Jarkko Sakkinen --- include/linux/mm_inline.h | 2 +- include/linux/swapops.h | 24 +++++++++++++++++++++++- mm/hugetlb.c | 4 ++++ mm/memory.c | 18 +++++++++++++++--- mm/mprotect.c | 6 ++++-- 5 files changed, 47 insertions(+), 7 deletions(-) diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h index 355cf46a01a6..1b6a917fffa4 100644 --- a/include/linux/mm_inline.h +++ b/include/linux/mm_inline.h @@ -544,7 +544,7 @@ static inline pte_marker copy_pte_marker( { pte_marker srcm = pte_marker_get(entry); /* Always copy error entries. */ - pte_marker dstm = srcm & PTE_MARKER_POISONED; + pte_marker dstm = srcm & (PTE_MARKER_POISONED | PTE_MARKER_GUARD); /* Only copy PTE markers if UFFD register matches. */ if ((srcm & PTE_MARKER_UFFD_WP) && userfaultfd_wp(dst_vma)) diff --git a/include/linux/swapops.h b/include/linux/swapops.h index cb468e418ea1..96f26e29fefe 100644 --- a/include/linux/swapops.h +++ b/include/linux/swapops.h @@ -426,9 +426,19 @@ typedef unsigned long pte_marker; * "Poisoned" here is meant in the very general sense of "future accesses are * invalid", instead of referring very specifically to hardware memory errors. * This marker is meant to represent any of various different causes of this. + * + * Note that, when encountered by the faulting logic, PTEs with this marker will + * result in VM_FAULT_HWPOISON and thus regardless trigger hardware memory error + * logic. */ #define PTE_MARKER_POISONED BIT(1) -#define PTE_MARKER_MASK (BIT(2) - 1) +/* + * Indicates that, on fault, this PTE will case a SIGSEGV signal to be + * sent. This means guard markers behave in effect as if the region were mapped + * PROT_NONE, rather than if they were a memory hole or equivalent. + */ +#define PTE_MARKER_GUARD BIT(2) +#define PTE_MARKER_MASK (BIT(3) - 1) static inline swp_entry_t make_pte_marker_entry(pte_marker marker) { @@ -464,6 +474,18 @@ static inline int is_poisoned_swp_entry(swp_entry_t entry) { return is_pte_marker_entry(entry) && (pte_marker_get(entry) & PTE_MARKER_POISONED); + +} + +static inline swp_entry_t make_guard_swp_entry(void) +{ + return make_pte_marker_entry(PTE_MARKER_GUARD); +} + +static inline int is_guard_swp_entry(swp_entry_t entry) +{ + return is_pte_marker_entry(entry) && + (pte_marker_get(entry) & PTE_MARKER_GUARD); } /* diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 906294ac85dc..2c8c5da0f5d3 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -6353,6 +6353,10 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, ret = VM_FAULT_HWPOISON_LARGE | VM_FAULT_SET_HINDEX(hstate_index(h)); goto out_mutex; + } else if (WARN_ON_ONCE(marker & PTE_MARKER_GUARD)) { + /* This isn't supported in hugetlb. */ + ret = VM_FAULT_SIGSEGV; + goto out_mutex; } } diff --git a/mm/memory.c b/mm/memory.c index 0f614523b9f4..551455cd453f 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1455,7 +1455,7 @@ static inline bool should_zap_folio(struct zap_details *details, return !folio_test_anon(folio); } -static inline bool zap_drop_file_uffd_wp(struct zap_details *details) +static inline bool zap_drop_markers(struct zap_details *details) { if (!details) return false; @@ -1476,7 +1476,7 @@ zap_install_uffd_wp_if_needed(struct vm_area_struct *vma, if (vma_is_anonymous(vma)) return; - if (zap_drop_file_uffd_wp(details)) + if (zap_drop_markers(details)) return; for (;;) { @@ -1671,7 +1671,15 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, * drop the marker if explicitly requested. */ if (!vma_is_anonymous(vma) && - !zap_drop_file_uffd_wp(details)) + !zap_drop_markers(details)) + continue; + } else if (is_guard_swp_entry(entry)) { + /* + * Ordinary zapping should not remove guard PTE + * markers. Only do so if we should remove PTE markers + * in general. + */ + if (!zap_drop_markers(details)) continue; } else if (is_hwpoison_entry(entry) || is_poisoned_swp_entry(entry)) { @@ -4003,6 +4011,10 @@ static vm_fault_t handle_pte_marker(struct vm_fault *vmf) if (marker & PTE_MARKER_POISONED) return VM_FAULT_HWPOISON; + /* Hitting a guard page is always a fatal condition. */ + if (marker & PTE_MARKER_GUARD) + return VM_FAULT_SIGSEGV; + if (pte_marker_entry_uffd_wp(entry)) return pte_marker_handle_uffd_wp(vmf); diff --git a/mm/mprotect.c b/mm/mprotect.c index 0c5d6d06107d..1f671b0667bd 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -236,9 +236,11 @@ static long change_pte_range(struct mmu_gather *tlb, } else if (is_pte_marker_entry(entry)) { /* * Ignore error swap entries unconditionally, - * because any access should sigbus anyway. + * because any access should sigbus/sigsegv + * anyway. */ - if (is_poisoned_swp_entry(entry)) + if (is_poisoned_swp_entry(entry) || + is_guard_swp_entry(entry)) continue; /* * If this is uffd-wp pte marker and we'd like