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authorMiklos Szeredi <mszeredi@redhat.com>2018-10-31 12:15:23 +0100
committerMiklos Szeredi <mszeredi@redhat.com>2018-10-31 12:15:23 +0100
commit5e1275808630ea3b2c97c776f40e475017535f72 (patch)
tree0a7d5c43ac0b662ad2822627a6f2dbc371c21530 /Documentation
parent14fa085640a7eb55431eec8a0273bbf0c463ce46 (diff)
downloadlinux-5e1275808630ea3b2c97c776f40e475017535f72.tar.bz2
ovl: check whiteout in ovl_create_over_whiteout()
Kaixuxia repors that it's possible to crash overlayfs by removing the whiteout on the upper layer before creating a directory over it. This is a reproducer: mkdir lower upper work merge touch lower/file mount -t overlay overlay -olowerdir=lower,upperdir=upper,workdir=work merge rm merge/file ls -al merge/file rm upper/file ls -al merge/ mkdir merge/file Before commencing with a vfs_rename(..., RENAME_EXCHANGE) verify that the lookup of "upper" is positive and is a whiteout, and return ESTALE otherwise. Reported by: kaixuxia <xiakaixu1987@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Fixes: e9be9d5e76e3 ("overlay filesystem") Cc: <stable@vger.kernel.org> # v3.18
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