In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: gate nfs2 setacl by argp->mask<\/p>\n
The NFSACL v2 SETACL path shares the decoder convention used by its
\nv3 sibling: nfsaclsvc_decode_setaclargs() fills in argp->acl_access
\nonly when NFS_ACL is set in the request mask and argp->acl_default
\nonly when NFS_DFACL is set, leaving the other pointer NULL because
\nthe argument buffer is zeroed up to pc_argzero before decode.<\/p>\n
nfsacld_proc_setacl() then hands both pointers to set_posix_acl()
\nunconditionally. set_posix_acl(idmap, dentry, type, NULL) is the VFS
\n“remove this ACL type” operation, so an omitted arm is
\nindistinguishable from an explicit request to delete that ACL. A
\nSETACL carrying only NFS_ACL silently strips the directory’s default
\nACL; mask=0 strips both.<\/p>\n
This is the same defect just fixed in nfsd3_proc_setacl(); apply the
\nsame remedy. Gate each set_posix_acl() call on its mask bit and
\ninitialize error to 0 so that a request with neither bit set leaves
\nthe on-disk ACLs untouched and returns success. The out_drop_lock
\npath and the unconditional posix_acl_release() in
\nnfsaclsvc_release_setacl() already tolerate the skipped arms.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: gate nfs2 setacl by argp->mask<\/p>\n
The NFSACL v2 SETACL path shares the decoder convention used by its
\nv3 sibling: nfsaclsvc_dec<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21594","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21594","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21594"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21594"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21594"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}