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[2a01:238:4383:600:38bc:a715:4b6d:a889]) by mx.google.com with ESMTPS id s50si91564edb.270.2019.07.19.11.46.55 for (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 19 Jul 2019 11:46:55 -0700 (PDT) Received-SPF: pass (google.com: domain of joro@8bytes.org designates 2a01:238:4383:600:38bc:a715:4b6d:a889 as permitted sender) client-ip=2a01:238:4383:600:38bc:a715:4b6d:a889; Authentication-Results: mx.google.com; spf=pass (google.com: domain of joro@8bytes.org designates 2a01:238:4383:600:38bc:a715:4b6d:a889 as permitted sender) smtp.mailfrom=joro@8bytes.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=8bytes.org Received: by theia.8bytes.org (Postfix, from userid 1000) id 7592122E; Fri, 19 Jul 2019 20:46:54 +0200 (CEST) From: Joerg Roedel To: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Joerg Roedel Subject: [PATCH 0/3 v3] Sync unmappings in vmalloc/ioremap areas Date: Fri, 19 Jul 2019 20:46:49 +0200 Message-Id: <20190719184652.11391-1-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 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: Hi, here is a small patch-set to sync unmappings in the vmalloc/ioremap areas between page-tables in the system. This is only needed x86-32 with !SHARED_KERNEL_PMD, which is the case on a PAE kernel with PTI enabled. On affected systems the missing sync causes old mappings to persist in some page-tables, causing data corruption and other undefined behavior. Please review. Thanks, Joerg Changes v2 -> v3: - Moved the vmalloc_sync_all() call to the lazy vmap purge function as requested by Andy Lutomirski - Made sure that the code in vmalloc_sync_all() really iterates over all pgds (pointed out by Thomas Gleixner) - Added a couple of comments Changes v1 -> v2: - Added correct Fixes-tags to all patches Joerg Roedel (3): x86/mm: Check for pfn instead of page in vmalloc_sync_one() x86/mm: Sync also unmappings in vmalloc_sync_all() mm/vmalloc: Sync unmappings in vunmap_page_range() arch/x86/mm/fault.c | 15 ++++++--------- mm/vmalloc.c | 9 +++++++++ 2 files changed, 15 insertions(+), 9 deletions(-) -- 2.17.1