From: Eric W. Biederman Date: Sat, 2 Feb 2013 11:03:04 +0000 (-0800) Subject: sunrpc: Properly decode kuids and kgids in RPC_AUTH_UNIX credentials X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=f025adf191924e3a75ce80e130afcd2485b53bb8;p=openwrt%2Fstaging%2Fblogic.git sunrpc: Properly decode kuids and kgids in RPC_AUTH_UNIX credentials When reading kuids from the wire map them into the initial user namespace, and validate the mapping succeded. When reading kgids from the wire map them into the initial user namespace, and validate the mapping succeded. Cc: "J. Bruce Fields" Cc: Trond Myklebust Signed-off-by: "Eric W. Biederman" --- diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c index bdea0a1b6d1d..a1852e19ed0c 100644 --- a/net/sunrpc/svcauth_unix.c +++ b/net/sunrpc/svcauth_unix.c @@ -821,8 +821,10 @@ svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp) argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */ argv->iov_len -= slen*4; - cred->cr_uid = svc_getnl(argv); /* uid */ - cred->cr_gid = svc_getnl(argv); /* gid */ + cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */ + cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */ + if (!uid_valid(cred->cr_uid) || !gid_valid(cred->cr_gid)) + goto badcred; slen = svc_getnl(argv); /* gids length */ if (slen > 16 || (len -= (slen + 2)*4) < 0) goto badcred;