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From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Sean Christopherson <seanjc@google.com>,
	Jim Mattson <jmattson@google.com>
Cc: David Rientjes <rientjes@google.com>,
	"Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
	"Kleen, Andi" <andi.kleen@intel.com>,
	"Yamahata, Isaku" <isaku.yamahata@intel.com>,
	Erdem Aktas <erdemaktas@google.com>,
	Steve Rutherford <srutherford@google.com>,
	Peter Gonda <pgonda@google.com>,
	David Hildenbrand <david@redhat.com>,
	x86@kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [RFCv2 09/13] shmem: Fail shmem_getpage_gfp() on poisoned pages
Date: Fri, 16 Apr 2021 18:41:02 +0300
Message-ID: <20210416154106.23721-10-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20210416154106.23721-1-kirill.shutemov@linux.intel.com>

Forbid access to poisoned pages.

TODO: Probably more fine-grained approach is needed. It shuld be a
allowed to fault-in these pages as hwpoison entries.

Not-Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 mm/shmem.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/shmem.c b/mm/shmem.c
index 7c6b6d8f6c39..d29a0c9be19c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1832,6 +1832,13 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index,
 
 	if (page)
 		hindex = page->index;
+
+	if (page && PageHWPoison(page)) {
+		unlock_page(page);
+		put_page(page);
+		return -EIO;
+	}
+
 	if (page && sgp == SGP_WRITE)
 		mark_page_accessed(page);
 
-- 
2.26.3


  parent reply index

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-16 15:40 [RFCv2 00/13] TDX and guest memory unmapping Kirill A. Shutemov
2021-04-16 15:40 ` [RFCv2 01/13] x86/mm: Move force_dma_unencrypted() to common code Kirill A. Shutemov
2021-04-16 15:40 ` [RFCv2 02/13] x86/kvm: Introduce KVM memory protection feature Kirill A. Shutemov
2021-04-16 16:10   ` Borislav Petkov
2021-04-19 10:10     ` Kirill A. Shutemov
2021-04-16 15:40 ` [RFCv2 03/13] x86/kvm: Make DMA pages shared Kirill A. Shutemov
2021-04-16 15:40 ` [RFCv2 04/13] x86/kvm: Use bounce buffers for KVM memory protection Kirill A. Shutemov
2021-04-16 16:21   ` Dave Hansen
2021-04-16 15:40 ` [RFCv2 05/13] x86/kvmclock: Share hvclock memory with the host Kirill A. Shutemov
2021-04-16 15:40 ` [RFCv2 06/13] x86/realmode: Share trampoline area if KVM memory protection enabled Kirill A. Shutemov
2021-04-19 16:49   ` Dave Hansen
2021-04-16 15:41 ` [RFCv2 07/13] mm: Add hwpoison_entry_to_pfn() and hwpoison_entry_to_page() Kirill A. Shutemov
2021-04-16 15:41 ` [RFCv2 08/13] mm/gup: Add FOLL_ALLOW_POISONED Kirill A. Shutemov
2021-04-16 15:41 ` Kirill A. Shutemov [this message]
2021-04-16 15:41 ` [RFCv2 10/13] mm: Keep page reference for hwpoison entries Kirill A. Shutemov
2021-04-16 15:41 ` [RFCv2 11/13] mm: Replace hwpoison entry with present PTE if page got unpoisoned Kirill A. Shutemov
2021-04-16 15:41 ` [RFCv2 12/13] KVM: passdown struct kvm to hva_to_pfn_slow() Kirill A. Shutemov
2021-04-16 15:41 ` [RFCv2 13/13] KVM: unmap guest memory using poisoned pages Kirill A. Shutemov
2021-04-16 17:30   ` Sean Christopherson
2021-04-19 11:32     ` Xiaoyao Li
2021-04-19 14:26     ` Kirill A. Shutemov
2021-04-19 16:01       ` Sean Christopherson
2021-04-19 16:40         ` Kirill A. Shutemov
2021-04-19 18:09           ` Sean Christopherson
2021-04-19 18:12             ` David Hildenbrand
2021-04-19 18:53             ` Kirill A. Shutemov
2021-04-19 20:09               ` Sean Christopherson
2021-04-19 22:57                 ` Kirill A. Shutemov
2021-04-20 17:13                   ` Sean Christopherson
2021-05-21 12:31                     ` Kirill A. Shutemov
2021-05-26 19:46                       ` Sean Christopherson
2021-05-31 20:07                         ` Kirill A. Shutemov
2021-06-02 17:51                           ` Sean Christopherson
2021-06-02 23:33                             ` Kirill A. Shutemov
2021-06-03 19:46                               ` Sean Christopherson
2021-06-04 14:29                                 ` Kirill A. Shutemov
2021-06-04 17:16                       ` Andy Lutomirski
2021-06-04 17:54                         ` Kirill A. Shutemov
2021-04-16 16:46 ` [RFCv2 00/13] TDX and guest memory unmapping Matthew Wilcox

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