CVE-2024-36882

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> mm: use memalloc_nofs_save() in page_cache_ra_order()<br /> <br /> See commit f2c817bed58d ("mm: use memalloc_nofs_save in readahead path"),<br /> ensure that page_cache_ra_order() do not attempt to reclaim file-backed<br /> pages too, or it leads to a deadlock, found issue when test ext4 large<br /> folio.<br /> <br /> INFO: task DataXceiver for:7494 blocked for more than 120 seconds.<br /> "echo 0 &gt; /proc/sys/kernel/hung_task_timeout_secs" disables this message.<br /> task:DataXceiver for state:D stack:0 pid:7494 ppid:1 flags:0x00000200<br /> Call trace:<br /> __switch_to+0x14c/0x240<br /> __schedule+0x82c/0xdd0<br /> schedule+0x58/0xf0<br /> io_schedule+0x24/0xa0<br /> __folio_lock+0x130/0x300<br /> migrate_pages_batch+0x378/0x918<br /> migrate_pages+0x350/0x700<br /> compact_zone+0x63c/0xb38<br /> compact_zone_order+0xc0/0x118<br /> try_to_compact_pages+0xb0/0x280<br /> __alloc_pages_direct_compact+0x98/0x248<br /> __alloc_pages+0x510/0x1110<br /> alloc_pages+0x9c/0x130<br /> folio_alloc+0x20/0x78<br /> filemap_alloc_folio+0x8c/0x1b0<br /> page_cache_ra_order+0x174/0x308<br /> ondemand_readahead+0x1c8/0x2b8<br /> page_cache_async_ra+0x68/0xb8<br /> filemap_readahead.isra.0+0x64/0xa8<br /> filemap_get_pages+0x3fc/0x5b0<br /> filemap_splice_read+0xf4/0x280<br /> ext4_file_splice_read+0x2c/0x48 [ext4]<br /> vfs_splice_read.part.0+0xa8/0x118<br /> splice_direct_to_actor+0xbc/0x288<br /> do_splice_direct+0x9c/0x108<br /> do_sendfile+0x328/0x468<br /> __arm64_sys_sendfile64+0x8c/0x148<br /> invoke_syscall+0x4c/0x118<br /> el0_svc_common.constprop.0+0xc8/0xf0<br /> do_el0_svc+0x24/0x38<br /> el0_svc+0x4c/0x1f8<br /> el0t_64_sync_handler+0xc0/0xc8<br /> el0t_64_sync+0x188/0x190