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Peter Anvin" , Michael Roth , Joerg Roedel , Dionna Glaze , Andy Lutomirski , Peter Zijlstra Subject: [RESEND PATCH v8 1/6] x86/sev: Fix calculation of end address based on number of pages Date: Fri, 19 May 2023 11:30:08 -0500 Message-ID: X-Mailer: git-send-email 2.40.0 In-Reply-To: References: <20230518231434.26080-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT009:EE_|DS7PR12MB6336:EE_ X-MS-Office365-Filtering-Correlation-Id: 57e49ce1-0f46-41b4-a936-08db58865dc5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230028)(4636009)(39860400002)(136003)(396003)(346002)(376002)(451199021)(36840700001)(40470700004)(46966006)(16526019)(70206006)(70586007)(4326008)(110136005)(54906003)(82740400003)(8936002)(8676002)(40480700001)(478600001)(316002)(6666004)(41300700001)(40460700003)(2906002)(86362001)(356005)(81166007)(26005)(82310400005)(47076005)(36756003)(186003)(336012)(426003)(7416002)(36860700001)(5660300002)(2616005)(83380400001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 May 2023 16:30:32.4372 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 57e49ce1-0f46-41b4-a936-08db58865dc5 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT009.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB6336 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" When calculating an end address based on an unsigned int number of pages, any value greater than or equal to 0x100000 that is shift PAGE_SHIFT bits results in a 0 value, resulting in an invalid end address. Change the number of pages variable in various routines from an unsigned int to an unsigned long to calculate the end address correctly. Fixes: 5e5ccff60a29 ("x86/sev: Add helper for validating pages in early enc= attribute changes") Fixes: dc3f3d2474b8 ("x86/mm: Validate memory when changing the C-bit") Signed-off-by: Tom Lendacky --- arch/x86/include/asm/sev.h | 16 ++++++++-------- arch/x86/kernel/sev.c | 14 +++++++------- 2 files changed, 15 insertions(+), 15 deletions(-) diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index 13dc2a9d23c1..7ca5c9ec8b52 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -192,12 +192,12 @@ struct snp_guest_request_ioctl; =20 void setup_ghcb(void); void __init early_snp_set_memory_private(unsigned long vaddr, unsigned lon= g paddr, - unsigned int npages); + unsigned long npages); void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long= paddr, - unsigned int npages); + unsigned long npages); void __init snp_prep_memory(unsigned long paddr, unsigned int sz, enum psc= _op op); -void snp_set_memory_shared(unsigned long vaddr, unsigned int npages); -void snp_set_memory_private(unsigned long vaddr, unsigned int npages); +void snp_set_memory_shared(unsigned long vaddr, unsigned long npages); +void snp_set_memory_private(unsigned long vaddr, unsigned long npages); void snp_set_wakeup_secondary_cpu(void); bool snp_init(struct boot_params *bp); void __init __noreturn snp_abort(void); @@ -212,12 +212,12 @@ static inline int pvalidate(unsigned long vaddr, bool= rmp_psize, bool validate) static inline int rmpadjust(unsigned long vaddr, bool rmp_psize, unsigned = long attrs) { return 0; } static inline void setup_ghcb(void) { } static inline void __init -early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, uns= igned int npages) { } +early_snp_set_memory_private(unsigned long vaddr, unsigned long paddr, uns= igned long npages) { } static inline void __init -early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsi= gned int npages) { } +early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr, unsi= gned long npages) { } static inline void __init snp_prep_memory(unsigned long paddr, unsigned in= t sz, enum psc_op op) { } -static inline void snp_set_memory_shared(unsigned long vaddr, unsigned int= npages) { } -static inline void snp_set_memory_private(unsigned long vaddr, unsigned in= t npages) { } +static inline void snp_set_memory_shared(unsigned long vaddr, unsigned lon= g npages) { } +static inline void snp_set_memory_private(unsigned long vaddr, unsigned lo= ng npages) { } static inline void snp_set_wakeup_secondary_cpu(void) { } static inline bool snp_init(struct boot_params *bp) { return false; } static inline void snp_abort(void) { } diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index b031244d6d2d..108bbae59c35 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -645,7 +645,7 @@ static u64 __init get_jump_table_addr(void) return ret; } =20 -static void pvalidate_pages(unsigned long vaddr, unsigned int npages, bool= validate) +static void pvalidate_pages(unsigned long vaddr, unsigned long npages, boo= l validate) { unsigned long vaddr_end; int rc; @@ -662,7 +662,7 @@ static void pvalidate_pages(unsigned long vaddr, unsign= ed int npages, bool valid } } =20 -static void __init early_set_pages_state(unsigned long paddr, unsigned int= npages, enum psc_op op) +static void __init early_set_pages_state(unsigned long paddr, unsigned lon= g npages, enum psc_op op) { unsigned long paddr_end; u64 val; @@ -701,7 +701,7 @@ static void __init early_set_pages_state(unsigned long = paddr, unsigned int npage } =20 void __init early_snp_set_memory_private(unsigned long vaddr, unsigned lon= g paddr, - unsigned int npages) + unsigned long npages) { /* * This can be invoked in early boot while running identity mapped, so @@ -723,7 +723,7 @@ void __init early_snp_set_memory_private(unsigned long = vaddr, unsigned long padd } =20 void __init early_snp_set_memory_shared(unsigned long vaddr, unsigned long= paddr, - unsigned int npages) + unsigned long npages) { /* * This can be invoked in early boot while running identity mapped, so @@ -879,7 +879,7 @@ static void __set_pages_state(struct snp_psc_desc *data= , unsigned long vaddr, sev_es_terminate(SEV_TERM_SET_LINUX, GHCB_TERM_PSC); } =20 -static void set_pages_state(unsigned long vaddr, unsigned int npages, int = op) +static void set_pages_state(unsigned long vaddr, unsigned long npages, int= op) { unsigned long vaddr_end, next_vaddr; struct snp_psc_desc *desc; @@ -904,7 +904,7 @@ static void set_pages_state(unsigned long vaddr, unsign= ed int npages, int op) kfree(desc); } =20 -void snp_set_memory_shared(unsigned long vaddr, unsigned int npages) +void snp_set_memory_shared(unsigned long vaddr, unsigned long npages) { if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) return; @@ -914,7 +914,7 @@ void snp_set_memory_shared(unsigned long vaddr, unsigne= d int npages) set_pages_state(vaddr, npages, SNP_PAGE_STATE_SHARED); } =20 -void snp_set_memory_private(unsigned long vaddr, unsigned int npages) +void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) return; --=20 2.40.0