cbcvebase.
CVE-2023-52490
published 2024-03-11

CVE-2023-52490: In the Linux kernel, the following vulnerability has been resolved: mm: migrate: fix getting incorrect page mapping during page migration When running…

PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.28%
19.8th percentile
In the Linux kernel, the following vulnerability has been resolved: mm: migrate: fix getting incorrect page mapping during page migration When running stress-ng testing, we found below kernel crash after a few hours: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 pc : dentry_name+0xd8/0x224 lr : pointer+0x22c/0x370 sp : ffff800025f134c0 ...... Call trace: dentry_name+0xd8/0x224 pointer+0x22c/0x370 vsnprintf+0x1ec/0x730 vscnprintf+0x2c/0x60 vprintk_store+0x70/0x234 vprintk_emit+0xe0/0x24c vprintk_default+0x3c/0x44 vprintk_func+0x84/0x2d0 printk+0x64/0x88 __dump_page+0x52c/0x530 dump_page+0x14/0x20 set_migratetype_isolate+0x110/0x224 start_isolate_page_range+0xc4/0x20c offline_pages+0x124/0x474 memory_block_offline+0x44/0xf4 memory_subsys_offline+0x3c/0x70 device_offline+0xf0/0x120 ...... After analyzing the vmcore, I found this issue is caused by page migration. The scenario is that, one thread is doing page migration, and we will use the target page's ->mapping field to save 'anon_vma' pointer between page unmap and page move, and now the target page is locked and refcount is 1. Currently, there is another stress-ng thread performing memory hotplug, attempting to offline the target page that is being migrated. It discovers that the refcount of this target page is 1, preventing the offline operation, thus proceeding to dump the page. However, page_mapping() of the target page may return an incorrect file mapping to crash the system in dump_mapping(), since the target page->mapping only saves 'anon_vma' pointer without setting PAGE_MAPPING_ANON flag. There are seveval ways to fix this issue: (1) Setting the PAGE_MAPPING_ANON flag for target page's ->mapping when saving 'anon_vma', but this can confuse PageAnon() for PFN walkers, since the target page has not built mappings yet. (2) Getting the page lock to call page_mapping() in __dump_page() to avoid crashing the system, however, there are still some PFN walkers that call p

Affected

11 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 6.6.15-1 (forky)linux 6.6.15-1 (forky)
linuxlinux
linuxlinux
linuxlinux>= 6.1.116 < 6.26.2
linuxlinux>= 64c8902ed4418317cd416c566f896bd4a92b2efc < 9128bfbc5c80d8f4874dd0a0424d1f5fb010df1b9128bfbc5c80d8f4874dd0a0424d1f5fb010df1b
linuxlinux>= 64c8902ed4418317cd416c566f896bd4a92b2efc < 3889a418b6eb9a1113fb989aaadecf2f649647673889a418b6eb9a1113fb989aaadecf2f64964767
linuxlinux>= 64c8902ed4418317cd416c566f896bd4a92b2efc < d1adb25df7111de83b64655a80b5a135adbded61d1adb25df7111de83b64655a80b5a135adbded61
linuxlinux_kernel>= 0 < 6.6.15-16.6.15-1
linuxlinux_kernel>= 0 < 6.6.15-16.6.15-1
linuxlinux_kernel>= 6.3 < 6.6.156.6.15
linuxlinux_kernel>= 6.7 < 6.7.36.7.3

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv7.5HIGH
vendor_ubuntu6.5MEDIUM
vendor_debian5.5LOW
vendor_redhat5.5MEDIUM
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