f2fs: use the mount idmap for the owner check in f2fs_xattr_advise_set()

In the Linux kernel, the following vulnerability has been resolved: f2fs: use the mount idmap for the owner check in f2fs_xattr_advise_set() f2fs_xattr_advise_set() calls inode_owner_or_capable() with &nop_mnt_idmap before allowing the "system.advise" xattr to be set, instead of the idmap that the VFS passes to the ->set() handler. f2fs supports idmapped mounts, so on such a mount this checks the caller's fsuid against the unmapped on-disk owner rather than the mapped owner: the actual owner can be wrongly denied with -EPERM and an unrelated caller wrongly allowed. Pass the handler's idmap instead.

Source published

16 Sep 2026 10:31:13 UTC

Source modified

19 Oct 2026 08:53:32 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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