Description
In the Linux kernel, the following vulnerability has been resolved: NFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages LOCALIO is an NFS loopback mount optimization that avoids using the network for READ, WRITE and COMMIT if the NFS client and server are determined to be on the same system. But because LOCALIO is still fundamentally "just NFS loopback mount" it is susceptible to recursion deadlock via direct reclaim, e.g.: NFS LOCALIO down to XFS and then back into NFS via nfs_writepages. Fix LOCALIO's potential for direct reclaim deadlock by ensuring that all its page cache allocations are done from GFP_NOFS context. Thanks to Ben Coddington for pointing out commit ad22c7a043c2 ("xfs: prevent stack overflows from page cache allocation").
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
70ba381e1a431245c137ed597ec6a05991c79bd9 to < 9118e1cab8a5571c6a95011f77ff28480aee9cb0affected70ba381e1a431245c137ed597ec6a05991c79bd9 to < ae26a4cf2baf0a44c538dc093504d1994b02dadeaffected70ba381e1a431245c137ed597ec6a05991c79bd9 to < 6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9affected70ba381e1a431245c137ed597ec6a05991c79bd9 to < 67435d2d8a33a75f9647724952cb1b18279d2e95affected
Linux Linux
Default version status: affected
6.12affected0 to < 6.12unaffected6.12.114 to ≤ 6.12.*unaffected6.18.14 to ≤ 6.18.*unaffected6.19.4 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected