Description
In the Linux kernel, the following vulnerability has been resolved: md: scope memalloc_noio to allocation critical sections Storing a memalloc_noio_save() token in mddev->noio_flags lets one task save the token and another task restore it. With concurrent suspend sysfs writes, task A can enter PF_MEMALLOC_NOIO, return to userspace still in that scope, and later task B can restore A's saved token. Avoid tying the token lifetime to mddev. Keep mddev_suspend() and mddev_resume() only responsible for array suspension, and enter PF_MEMALLOC_NOIO only in the MD paths that allocate memory after the array has been suspended. Restore the token before resuming the array. A reproducer repeatedly writes suspend_lo and suspend_hi from concurrent workers and checks each worker's /proc/self/stat flags before and after the sysfs write.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
78f57ef9d50a75326da73d352d7c27828495229a to < 72ebfdf507ede7d7f2b7ca0a5634811a0e4bf045affected78f57ef9d50a75326da73d352d7c27828495229a to < 28fdea874f68cac6c36651b1fc7272fd2199c48daffected78f57ef9d50a75326da73d352d7c27828495229a to < a58923756b0f8e71032070c23ae0b167e46731daaffected78f57ef9d50a75326da73d352d7c27828495229a to < bace2010dd7ac07bc980575afb135c406730a7feaffected
Linux Linux
Default version status: affected
5.8affected0 to < 5.8unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected