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5b08dccecfNTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL permission metadata and reloads them into i_uid, i_gid and i_mode from ntfs_get_wsl_perm(). Because the empty-prefix xattr handler also lets file owners call setxattr() on these names directly, an unprivileged writer on a writable ntfs3 mount can plant root ownership and S_ISUID on their own file and gain euid 0 after inode reload. Reject direct userspace writes to the reserved $LX* names. Internal ntfs3 metadata updates are unchanged because ntfs_save_wsl_perm() writes them via ntfs_set_ea() directly. Signed-off-by: Zhen Yan <sdjasjbuaa@gmail.com> [almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users] Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
1073 lines
22 KiB
1073 lines
22 KiB