/*
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/*
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* linux/net/sunrpc/rpcauth_unix.c
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* linux/net/sunrpc/rpcauth_unix.c
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*
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*
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* UNIX-style authentication; no AUTH_SHORT support
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* UNIX-style authentication; no AUTH_SHORT support
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*
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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*/
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#include <linux/types.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/slab.h>
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#include <linux/socket.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/in.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/auth.h>
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#include <linux/sunrpc/auth.h>
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#define NFS_NGROUPS 16
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#define NFS_NGROUPS 16
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struct unx_cred {
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struct unx_cred {
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struct rpc_cred uc_base;
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struct rpc_cred uc_base;
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uid_t uc_fsuid;
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uid_t uc_fsuid;
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gid_t uc_gid, uc_fsgid;
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gid_t uc_gid, uc_fsgid;
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gid_t uc_gids[NFS_NGROUPS];
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gid_t uc_gids[NFS_NGROUPS];
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};
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};
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#define uc_uid uc_base.cr_uid
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#define uc_uid uc_base.cr_uid
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#define uc_count uc_base.cr_count
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#define uc_count uc_base.cr_count
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#define uc_flags uc_base.cr_flags
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#define uc_flags uc_base.cr_flags
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#define uc_expire uc_base.cr_expire
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#define uc_expire uc_base.cr_expire
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#define UNX_CRED_EXPIRE (60 * HZ)
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#define UNX_CRED_EXPIRE (60 * HZ)
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#define UNX_WRITESLACK (21 + (UNX_MAXNODENAME >> 2))
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#define UNX_WRITESLACK (21 + (UNX_MAXNODENAME >> 2))
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#ifdef RPC_DEBUG
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#ifdef RPC_DEBUG
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# define RPCDBG_FACILITY RPCDBG_AUTH
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# define RPCDBG_FACILITY RPCDBG_AUTH
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#endif
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#endif
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static struct rpc_credops unix_credops;
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static struct rpc_credops unix_credops;
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static struct rpc_auth *
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static struct rpc_auth *
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unx_create(struct rpc_clnt *clnt)
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unx_create(struct rpc_clnt *clnt)
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{
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{
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struct rpc_auth *auth;
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struct rpc_auth *auth;
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dprintk("RPC: creating UNIX authenticator for client %p\n", clnt);
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dprintk("RPC: creating UNIX authenticator for client %p\n", clnt);
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if (!(auth = (struct rpc_auth *) rpc_allocate(0, sizeof(*auth))))
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if (!(auth = (struct rpc_auth *) rpc_allocate(0, sizeof(*auth))))
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return NULL;
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return NULL;
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auth->au_cslack = UNX_WRITESLACK;
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auth->au_cslack = UNX_WRITESLACK;
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auth->au_rslack = 2; /* assume AUTH_NULL verf */
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auth->au_rslack = 2; /* assume AUTH_NULL verf */
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auth->au_expire = UNX_CRED_EXPIRE;
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auth->au_expire = UNX_CRED_EXPIRE;
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auth->au_ops = &authunix_ops;
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auth->au_ops = &authunix_ops;
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rpcauth_init_credcache(auth);
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rpcauth_init_credcache(auth);
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return auth;
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return auth;
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}
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}
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static void
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static void
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unx_destroy(struct rpc_auth *auth)
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unx_destroy(struct rpc_auth *auth)
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{
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{
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dprintk("RPC: destroying UNIX authenticator %p\n", auth);
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dprintk("RPC: destroying UNIX authenticator %p\n", auth);
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rpcauth_free_credcache(auth);
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rpcauth_free_credcache(auth);
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rpc_free(auth);
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rpc_free(auth);
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}
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}
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static struct rpc_cred *
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static struct rpc_cred *
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unx_create_cred(int flags)
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unx_create_cred(int flags)
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{
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{
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struct unx_cred *cred;
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struct unx_cred *cred;
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int i;
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int i;
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dprintk("RPC: allocating UNIX cred for uid %d gid %d\n",
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dprintk("RPC: allocating UNIX cred for uid %d gid %d\n",
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current->uid, current->gid);
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current->uid, current->gid);
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if (!(cred = (struct unx_cred *) rpc_allocate(flags, sizeof(*cred))))
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if (!(cred = (struct unx_cred *) rpc_allocate(flags, sizeof(*cred))))
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return NULL;
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return NULL;
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atomic_set(&cred->uc_count, 0);
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atomic_set(&cred->uc_count, 0);
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cred->uc_flags = RPCAUTH_CRED_UPTODATE;
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cred->uc_flags = RPCAUTH_CRED_UPTODATE;
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if (flags & RPC_TASK_ROOTCREDS) {
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if (flags & RPC_TASK_ROOTCREDS) {
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cred->uc_uid = cred->uc_fsuid = 0;
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cred->uc_uid = cred->uc_fsuid = 0;
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cred->uc_gid = cred->uc_fsgid = 0;
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cred->uc_gid = cred->uc_fsgid = 0;
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cred->uc_gids[0] = NOGROUP;
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cred->uc_gids[0] = NOGROUP;
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} else {
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} else {
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int groups = current->ngroups;
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int groups = current->ngroups;
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if (groups > NFS_NGROUPS)
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if (groups > NFS_NGROUPS)
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groups = NFS_NGROUPS;
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groups = NFS_NGROUPS;
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cred->uc_uid = current->uid;
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cred->uc_uid = current->uid;
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cred->uc_gid = current->gid;
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cred->uc_gid = current->gid;
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cred->uc_fsuid = current->fsuid;
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cred->uc_fsuid = current->fsuid;
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cred->uc_fsgid = current->fsgid;
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cred->uc_fsgid = current->fsgid;
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for (i = 0; i < groups; i++)
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for (i = 0; i < groups; i++)
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cred->uc_gids[i] = (gid_t) current->groups[i];
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cred->uc_gids[i] = (gid_t) current->groups[i];
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if (i < NFS_NGROUPS)
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if (i < NFS_NGROUPS)
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cred->uc_gids[i] = NOGROUP;
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cred->uc_gids[i] = NOGROUP;
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}
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}
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cred->uc_base.cr_ops = &unix_credops;
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cred->uc_base.cr_ops = &unix_credops;
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return (struct rpc_cred *) cred;
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return (struct rpc_cred *) cred;
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}
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}
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struct rpc_cred *
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struct rpc_cred *
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authunix_fake_cred(struct rpc_task *task, uid_t uid, gid_t gid)
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authunix_fake_cred(struct rpc_task *task, uid_t uid, gid_t gid)
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{
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{
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struct unx_cred *cred;
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struct unx_cred *cred;
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dprintk("RPC: allocating fake UNIX cred for uid %d gid %d\n",
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dprintk("RPC: allocating fake UNIX cred for uid %d gid %d\n",
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uid, gid);
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uid, gid);
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if (!(cred = (struct unx_cred *) rpc_malloc(task, sizeof(*cred))))
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if (!(cred = (struct unx_cred *) rpc_malloc(task, sizeof(*cred))))
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return NULL;
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return NULL;
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atomic_set(&cred->uc_count, 1);
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atomic_set(&cred->uc_count, 1);
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cred->uc_flags = RPCAUTH_CRED_DEAD|RPCAUTH_CRED_UPTODATE;
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cred->uc_flags = RPCAUTH_CRED_DEAD|RPCAUTH_CRED_UPTODATE;
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cred->uc_uid = uid;
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cred->uc_uid = uid;
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cred->uc_gid = gid;
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cred->uc_gid = gid;
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cred->uc_fsuid = uid;
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cred->uc_fsuid = uid;
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cred->uc_fsgid = gid;
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cred->uc_fsgid = gid;
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cred->uc_gids[0] = (gid_t) NOGROUP;
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cred->uc_gids[0] = (gid_t) NOGROUP;
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return task->tk_msg.rpc_cred = (struct rpc_cred *) cred;
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return task->tk_msg.rpc_cred = (struct rpc_cred *) cred;
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}
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}
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static void
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static void
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unx_destroy_cred(struct rpc_cred *cred)
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unx_destroy_cred(struct rpc_cred *cred)
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{
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{
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rpc_free(cred);
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rpc_free(cred);
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}
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}
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/*
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/*
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* Match credentials against current process creds.
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* Match credentials against current process creds.
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* The root_override argument takes care of cases where the caller may
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* The root_override argument takes care of cases where the caller may
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* request root creds (e.g. for NFS swapping).
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* request root creds (e.g. for NFS swapping).
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*/
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*/
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static int
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static int
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unx_match(struct rpc_cred *rcred, int taskflags)
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unx_match(struct rpc_cred *rcred, int taskflags)
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{
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{
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struct unx_cred *cred = (struct unx_cred *) rcred;
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struct unx_cred *cred = (struct unx_cred *) rcred;
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int i;
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int i;
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if (!(taskflags & RPC_TASK_ROOTCREDS)) {
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if (!(taskflags & RPC_TASK_ROOTCREDS)) {
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int groups;
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int groups;
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if (cred->uc_uid != current->uid
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if (cred->uc_uid != current->uid
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|| cred->uc_gid != current->gid
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|| cred->uc_gid != current->gid
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|| cred->uc_fsuid != current->fsuid
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|| cred->uc_fsuid != current->fsuid
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|| cred->uc_fsgid != current->fsgid)
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|| cred->uc_fsgid != current->fsgid)
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return 0;
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return 0;
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groups = current->ngroups;
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groups = current->ngroups;
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if (groups > NFS_NGROUPS)
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if (groups > NFS_NGROUPS)
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groups = NFS_NGROUPS;
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groups = NFS_NGROUPS;
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for (i = 0; i < groups ; i++)
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for (i = 0; i < groups ; i++)
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if (cred->uc_gids[i] != (gid_t) current->groups[i])
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if (cred->uc_gids[i] != (gid_t) current->groups[i])
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return 0;
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return 0;
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return 1;
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return 1;
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}
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}
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return (cred->uc_uid == 0 && cred->uc_fsuid == 0
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return (cred->uc_uid == 0 && cred->uc_fsuid == 0
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&& cred->uc_gid == 0 && cred->uc_fsgid == 0
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&& cred->uc_gid == 0 && cred->uc_fsgid == 0
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&& cred->uc_gids[0] == (gid_t) NOGROUP);
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&& cred->uc_gids[0] == (gid_t) NOGROUP);
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}
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}
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/*
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/*
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* Marshal credentials.
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* Marshal credentials.
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* Maybe we should keep a cached credential for performance reasons.
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* Maybe we should keep a cached credential for performance reasons.
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*/
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*/
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static u32 *
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static u32 *
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unx_marshal(struct rpc_task *task, u32 *p, int ruid)
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unx_marshal(struct rpc_task *task, u32 *p, int ruid)
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{
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{
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struct rpc_clnt *clnt = task->tk_client;
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struct rpc_clnt *clnt = task->tk_client;
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struct unx_cred *cred = (struct unx_cred *) task->tk_msg.rpc_cred;
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struct unx_cred *cred = (struct unx_cred *) task->tk_msg.rpc_cred;
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u32 *base, *hold;
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u32 *base, *hold;
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int i, n;
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int i, n;
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*p++ = htonl(RPC_AUTH_UNIX);
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*p++ = htonl(RPC_AUTH_UNIX);
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base = p++;
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base = p++;
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*p++ = htonl(jiffies/HZ);
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*p++ = htonl(jiffies/HZ);
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/*
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/*
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* Copy the UTS nodename captured when the client was created.
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* Copy the UTS nodename captured when the client was created.
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*/
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*/
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n = clnt->cl_nodelen;
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n = clnt->cl_nodelen;
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*p++ = htonl(n);
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*p++ = htonl(n);
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memcpy(p, clnt->cl_nodename, n);
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memcpy(p, clnt->cl_nodename, n);
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p += (n + 3) >> 2;
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p += (n + 3) >> 2;
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/* Note: we don't use real uid if it involves raising priviledge */
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/* Note: we don't use real uid if it involves raising priviledge */
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if (ruid && cred->uc_uid != 0 && cred->uc_gid != 0) {
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if (ruid && cred->uc_uid != 0 && cred->uc_gid != 0) {
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*p++ = htonl((u32) cred->uc_uid);
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*p++ = htonl((u32) cred->uc_uid);
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*p++ = htonl((u32) cred->uc_gid);
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*p++ = htonl((u32) cred->uc_gid);
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} else {
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} else {
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*p++ = htonl((u32) cred->uc_fsuid);
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*p++ = htonl((u32) cred->uc_fsuid);
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*p++ = htonl((u32) cred->uc_fsgid);
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*p++ = htonl((u32) cred->uc_fsgid);
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}
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}
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hold = p++;
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hold = p++;
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for (i = 0; i < 16 && cred->uc_gids[i] != (gid_t) NOGROUP; i++)
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for (i = 0; i < 16 && cred->uc_gids[i] != (gid_t) NOGROUP; i++)
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*p++ = htonl((u32) cred->uc_gids[i]);
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*p++ = htonl((u32) cred->uc_gids[i]);
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*hold = htonl(p - hold - 1); /* gid array length */
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*hold = htonl(p - hold - 1); /* gid array length */
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*base = htonl((p - base - 1) << 2); /* cred length */
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*base = htonl((p - base - 1) << 2); /* cred length */
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*p++ = htonl(RPC_AUTH_NULL);
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*p++ = htonl(RPC_AUTH_NULL);
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*p++ = htonl(0);
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*p++ = htonl(0);
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return p;
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return p;
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}
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}
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/*
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/*
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* Refresh credentials. This is a no-op for AUTH_UNIX
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* Refresh credentials. This is a no-op for AUTH_UNIX
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*/
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*/
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static int
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static int
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unx_refresh(struct rpc_task *task)
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unx_refresh(struct rpc_task *task)
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{
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{
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task->tk_msg.rpc_cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
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task->tk_msg.rpc_cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
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return task->tk_status = -EACCES;
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return task->tk_status = -EACCES;
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}
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}
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static u32 *
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static u32 *
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unx_validate(struct rpc_task *task, u32 *p)
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unx_validate(struct rpc_task *task, u32 *p)
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{
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{
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u32 n = ntohl(*p++);
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u32 n = ntohl(*p++);
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if (n != RPC_AUTH_NULL && n != RPC_AUTH_UNIX && n != RPC_AUTH_SHORT) {
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if (n != RPC_AUTH_NULL && n != RPC_AUTH_UNIX && n != RPC_AUTH_SHORT) {
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printk("RPC: bad verf flavor: %ld\n", (unsigned long) n);
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printk("RPC: bad verf flavor: %ld\n", (unsigned long) n);
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return NULL;
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return NULL;
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}
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}
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if ((n = ntohl(*p++)) > 400) {
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if ((n = ntohl(*p++)) > 400) {
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printk("RPC: giant verf size: %ld\n", (unsigned long) n);
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printk("RPC: giant verf size: %ld\n", (unsigned long) n);
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return NULL;
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return NULL;
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}
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}
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task->tk_auth->au_rslack = (n >> 2) + 2;
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task->tk_auth->au_rslack = (n >> 2) + 2;
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p += (n >> 2);
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p += (n >> 2);
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return p;
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return p;
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}
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}
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struct rpc_authops authunix_ops = {
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struct rpc_authops authunix_ops = {
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RPC_AUTH_UNIX,
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RPC_AUTH_UNIX,
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#ifdef RPC_DEBUG
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#ifdef RPC_DEBUG
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"UNIX",
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"UNIX",
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#endif
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#endif
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unx_create,
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unx_create,
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unx_destroy,
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unx_destroy,
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unx_create_cred
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unx_create_cred
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};
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};
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static
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static
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struct rpc_credops unix_credops = {
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struct rpc_credops unix_credops = {
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unx_destroy_cred,
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unx_destroy_cred,
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unx_match,
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unx_match,
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unx_marshal,
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unx_marshal,
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unx_refresh,
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unx_refresh,
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unx_validate
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unx_validate
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};
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};
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