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([114.29.24.243]) by smtp.gmail.com with ESMTPSA id v10-20020a170902b7ca00b0016363b15acasm6284451plz.112.2022.06.13.23.39.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Jun 2022 23:39:58 -0700 (PDT) From: Hyeonggon Yoo <42.hyeyoo@gmail.com> To: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , Dan Williams , Paolo Bonzini , Jane Chu , "Aneesh Kumar K . V" , Sean Christopherson , Tianyu Lan , Mike Rapoport , Rick Edgecombe , linux-mm@kvack.org Cc: Borislav Petkov , x86@kernel.org, Hyeonggon Yoo <42.hyeyoo@gmail.com> Subject: [RFC 1/2] x86/mm/cpa: always fail when user address is passed Date: Tue, 14 Jun 2022 15:39:32 +0900 Message-Id: <20220614063933.13030-2-42.hyeyoo@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220614063933.13030-1-42.hyeyoo@gmail.com> References: <20220614063933.13030-1-42.hyeyoo@gmail.com> MIME-Version: 1.0 ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1655188800; 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-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=r/OSHyw2h9GxpZzni9LUt3ZrKKoUqLFVHpCx3XbR62g=; b=c/6A3kCrFke566J7emLxzgylRoz2XdTJ5UBzYLCpq5GMfMxbFAKcybzeA++QuzV+tXPhbc gqGvZQ0ngdczCdF2ZLU1M4xFI6WKteC1NB6piIm2O3uVLemfalbWZHamc9jU8Lx0vHq1l9 CpSN3fKPcepr5YeLd7fInBByasdaL0o= ARC-Authentication-Results: i=1; imf30.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=Wx1qjnTV; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf30.hostedemail.com: domain of 42.hyeyoo@gmail.com designates 209.85.214.177 as permitted sender) smtp.mailfrom=42.hyeyoo@gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1655188800; a=rsa-sha256; cv=none; b=YGZGok1+st0bHRyh2Ra+ceTFCkko3whs8mBZu7XrbNmhdrQYd73oJZO7sfGAbrlr6yJKTP TRp6UL7dXaBM1QgG9R4BchYcsFPc/4P7rersWoNE+Z/utZ45A5kJl7versyPOxId4Sf8nC UjYeIyrMBjGSBGtSUJeQ1kL4hd1eJws= X-Rspamd-Queue-Id: 0926A8008F X-Rspam-User: X-Stat-Signature: 3bswg8qktwmhzpu1cacqbka4trjyt77k Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=Wx1qjnTV; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf30.hostedemail.com: domain of 42.hyeyoo@gmail.com designates 209.85.214.177 as permitted sender) smtp.mailfrom=42.hyeyoo@gmail.com X-Rspamd-Server: rspam04 X-HE-Tag: 1655188799-763396 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: Currently CPA is not used for user mappings (only pgd of init_mm or and efi_mm is used). For simplicity, always fail when user address is passed. Note that efi_mm uses 1:1 mapping so its address should not be considered as user address. Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> --- arch/x86/mm/pat/set_memory.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 1abd5438f126..67cf969fed0d 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -1514,6 +1515,11 @@ static int __change_page_attr(struct cpa_data *cpa, int primary) pte_t *kpte, old_pte; address = __cpa_addr(cpa, cpa->curpage); + + if (WARN((IS_ENABLED(CONFIG_EFI) ? cpa->pgd != efi_mm.pgd : true) + && address <= TASK_SIZE_MAX, + KERN_WARNING "CPA: Got a user address")) + return -EINVAL; repeat: kpte = _lookup_address_cpa(cpa, address, &level); if (!kpte)