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[217.140.101.70]) by mx.google.com with ESMTP id t23si3044404ejf.99.2019.02.13.00.06.46 for ; Wed, 13 Feb 2019 00:06:46 -0800 (PST) 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 8337115BF; Wed, 13 Feb 2019 00:06:45 -0800 (PST) Received: from p8cg001049571a15.blr.arm.com (p8cg001049571a15.blr.arm.com [10.162.43.147]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 22D493F575; Wed, 13 Feb 2019 00:06:41 -0800 (PST) From: Anshuman Khandual To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: mhocko@kernel.org, kirill@shutemov.name, kirill.shutemov@linux.intel.com, vbabka@suse.cz, will.deacon@arm.com, catalin.marinas@arm.com, dave.hansen@intel.com Subject: [RFC 2/4] arm64/mm: Identify user level instruction faults Date: Wed, 13 Feb 2019 13:36:29 +0530 Message-Id: <1550045191-27483-3-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1550045191-27483-1-git-send-email-anshuman.khandual@arm.com> References: <1550045191-27483-1-git-send-email-anshuman.khandual@arm.com> 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: X-Virus-Scanned: ClamAV using ClamSMTP Page fault flags (FAULT_FLAG_XXX) need to be passed down fault handling path for appropriate action and reporting. Identify user instruction fetch faults and mark them with FAULT_FLAG_INSTRUCTION. Signed-off-by: Anshuman Khandual --- arch/arm64/mm/fault.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index efb7b2c..591670d 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -468,6 +468,9 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr, mm_flags |= FAULT_FLAG_WRITE; } + if (is_el0_instruction_abort(esr)) + mm_flags |= FAULT_FLAG_INSTRUCTION; + if (is_ttbr0_addr(addr) && is_el1_permission_fault(addr, esr, regs)) { /* regs->orig_addr_limit may be 0 if we entered from EL0 */ if (regs->orig_addr_limit == KERNEL_DS)