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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jun 2025 05:10:33.0743 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c303d118-ed4c-46a5-bf15-08dda713f61b 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: DB1PEPF000509FA.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB7772 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250608_221044_203646_EF2DC9F1 X-CRM114-Status: GOOD ( 12.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 09/06/25 9:42 am, Anshuman Khandual wrote: > The arm64 page table dump code can race with concurrent modification of the > kernel page tables. When a leaf entries are modified concurrently, the dump > code may log stale or inconsistent information for a VA range, but this is > otherwise not harmful. > > When intermediate levels of table are freed, the dump code will continue to > use memory which has been freed and potentially reallocated for another > purpose. In such cases, the dump code may dereference bogus addresses, > leading to a number of potential problems. > > This problem was fixed for ptdump_show() earlier via commit 'bf2b59f60ee1 > ("arm64/mm: Hold memory hotplug lock while walking for kernel page table > dump")' but a same was missed for ptdump_check_wx() which faced the race > condition as well. Let's just take the memory hotplug lock while executing > ptdump_check_wx(). > > Cc: stable@vger.kernel.org > Fixes: bbd6ec605c0f ("arm64/mm: Enable memory hot remove") > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Ryan Roberts > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Reported-by: Dev Jain > Signed-off-by: Anshuman Khandual > --- LGTM Reviewed-by: Dev Jain