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Biederman" , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Lorenzo Stoakes , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , Quentin Perret , Ryan Roberts , Thomas Gleixner , Vlastimil Babka , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org Subject: Re: [RFC PATCH v2 3/8] slab: Introduce SLAB_SET_PKEY Message-ID: References: <20250815090000.2182450-1-kevin.brodsky@arm.com> <20250815090000.2182450-4-kevin.brodsky@arm.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250815090000.2182450-4-kevin.brodsky@arm.com> X-ClientProxiedBy: LO4P123CA0091.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:191::6) To GV1PR08MB10521.eurprd08.prod.outlook.com (2603:10a6:150:163::20) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: GV1PR08MB10521:EE_|PA6PR08MB10545:EE_|DU6PEPF0000A7DD:EE_|GV2PR08MB9880:EE_ X-MS-Office365-Filtering-Correlation-Id: e2f50d5c-9a6b-4fb6-a110-08de2dd33fe0 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|366016|1800799024|376014|7416014; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Nov 2025 16:37:26.5246 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e2f50d5c-9a6b-4fb6-a110-08de2dd33fe0 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DU6PEPF0000A7DD.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV2PR08MB9880 Hi Kevin, [...] > static __fastpath_inline > @@ -4920,6 +4963,7 @@ __do_krealloc(const void *p, size_t new_size, gfp_t flags) > /* Zero out spare memory. */ > if (want_init_on_alloc(flags)) { > kasan_disable_current(); > + guard(kpkeys_slab_write)(s); > if (orig_size && orig_size < new_size) > memset(kasan_reset_tag(p) + orig_size, 0, new_size - orig_size); > else guard(kpkeys_slab_write)(s) will trigger NULL-pointer access if *p* is allocated via kmalloc_large_noprof() (no kmem_cache, allocated via page_alloc()). IOW, "s" could be *NULL* in here. [...] Thanks. -- Sincerely, Yeoreum Yun