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[217.140.101.70]) by mx.google.com with ESMTP id p18si421306ejq.220.2019.05.14.19.36.06 for ; Tue, 14 May 2019 19:36:06 -0700 (PDT) Received-SPF: pass (google.com: domain of anshuman.khandual@arm.com designates 217.140.101.70 as permitted sender) client-ip=217.140.101.70; Authentication-Results: mx.google.com; spf=pass (google.com: domain of anshuman.khandual@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=anshuman.khandual@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4A0CF341; Tue, 14 May 2019 19:36:05 -0700 (PDT) Received: from p8cg001049571a15.arm.com (unknown [10.163.1.137]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 7A45C3F703; Tue, 14 May 2019 19:35:58 -0700 (PDT) From: Anshuman Khandual To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org Cc: Anshuman Khandual , Toshi Kani , Andrew Morton , Will Deacon , Chintan Pandya , Thomas Gleixner , Catalin Marinas Subject: [PATCH V4] mm/ioremap: Check virtual address alignment while creating huge mappings Date: Wed, 15 May 2019 08:05:16 +0530 Message-Id: <1557887716-17918-1-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: 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: Virtual address alignment is essential in ensuring correct clearing for all intermediate level pgtable entries and freeing associated pgtable pages. An unaligned address can end up randomly freeing pgtable page that potentially still contains valid mappings. Hence also check it's alignment along with existing phys_addr check. Signed-off-by: Anshuman Khandual Cc: Toshi Kani Cc: Andrew Morton Cc: Will Deacon Cc: Chintan Pandya Cc: Thomas Gleixner Cc: Catalin Marinas --- Changes in V4: - Added similar check for ioremap_try_huge_p4d() as per Toshi Kani lib/ioremap.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/lib/ioremap.c b/lib/ioremap.c index 063213685563..a95161d9c883 100644 --- a/lib/ioremap.c +++ b/lib/ioremap.c @@ -86,6 +86,9 @@ static int ioremap_try_huge_pmd(pmd_t *pmd, unsigned long addr, if ((end - addr) != PMD_SIZE) return 0; + if (!IS_ALIGNED(addr, PMD_SIZE)) + return 0; + if (!IS_ALIGNED(phys_addr, PMD_SIZE)) return 0; @@ -126,6 +129,9 @@ static int ioremap_try_huge_pud(pud_t *pud, unsigned long addr, if ((end - addr) != PUD_SIZE) return 0; + if (!IS_ALIGNED(addr, PUD_SIZE)) + return 0; + if (!IS_ALIGNED(phys_addr, PUD_SIZE)) return 0; @@ -166,6 +172,9 @@ static int ioremap_try_huge_p4d(p4d_t *p4d, unsigned long addr, if ((end - addr) != P4D_SIZE) return 0; + if (!IS_ALIGNED(addr, P4D_SIZE)) + return 0; + if (!IS_ALIGNED(phys_addr, P4D_SIZE)) return 0; -- 2.20.1