/* Key permission checking * * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include #include #include "internal.h" /** * key_task_permission - Check a key can be used * @key_ref: The key to check. * @cred: The credentials to use. * @perm: The permissions to check for. * * Check to see whether permission is granted to use a key in the desired way, * but permit the security modules to override. * * The caller must hold either a ref on cred or must hold the RCU readlock. * * Returns 0 if successful, -EACCES if access is denied based on the * permissions bits or the LSM check. */ int key_task_permission(const key_ref_t key_ref, const struct cred *cred, unsigned perm) { struct key *key; key_perm_t kperm; int ret; key = key_ref_to_ptr(key_ref); /* use the second 8-bits of permissions for keys the caller owns */ if (uid_eq(key->uid, cred->fsuid)) { kperm = key->perm >> 16; goto use_these_perms; } /* use the third 8-bits of permissions for keys the caller has a group * membership in common with */ if (gid_valid(key->gid) && key->perm & KEY_GRP_ALL) { if (gid_eq(key->gid, cred->fsgid)) { kperm = key->perm >> 8; goto use_these_perms; } ret = groups_search(cred->group_info, key->gid); if (ret) { kperm = key->perm >> 8; goto use_these_perms; } } /* otherwise use the least-significant 8-bits */ kperm = key->perm; use_these_perms: /* use the top 8-bits of permissions for keys the caller possesses * - possessor permissions are additive with other permissions */ if (is_key_possessed(key_ref)) kperm |= key->perm >> 24; kperm = kperm & perm & KEY_NEED_ALL; if (kperm != perm) return -EACCES; /* let LSM be the final arbiter */ return security_key_permission(key_ref, cred, perm); } EXPORT_SYMBOL(key_task_permission); /** * key_validate - Validate a key. * @key: The key to be validated. * * Check that a key is valid, returning 0 if the key is okay, -ENOKEY if the * key is invalidated, -EKEYREVOKED if the key's type has been removed or if * the key has been revoked or -EKEYEXPIRED if the key has expired. */ int key_validate(const struct key *key) { unsigned long flags = key->flags; if (flags & (1 << KEY_FLAG_INVALIDATED)) return -ENOKEY; /* check it's still accessible */ if (flags & ((1 << KEY_FLAG_REVOKED) | (1 << KEY_FLAG_DEAD))) return -EKEYREVOKED; /* check it hasn't expired */ if (key->expiry) { struct timespec now = current_kernel_time(); if (now.tv_sec >= key->expiry) return -EKEYEXPIRED; } return 0; } EXPORT_SYMBOL(key_validate); f6aa1ccab'>root/net/batman-adv/bat_v.h

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author	Feng <fgao@ikuai8.com>	2017-01-20 21:40:43 +0800
committer	Pablo Neira Ayuso <pablo@netfilter.org>	2017-02-02 14:30:19 +0100
commit	10435c1192d06bdb0bac7666452d8219d7e7c477 (patch)
tree	93b76419142fe17b1d162d062c663297a3e8a965 /net/x25/x25_link.c
parent	1a28ad74ebd8f9d3c7eae0d781f72a6d30545e17 (diff)

netfilter: nf_tables: Eliminate duplicated code in nf_tables_table_enable()

If something fails in nf_tables_table_enable(), it unregisters the chains. But the rollback code is the same as nf_tables_table_disable() almostly, except there is one counter check. Now create one wrapper function to eliminate the duplicated codes. Signed-off-by: Feng <fgao@ikuai8.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Diffstat (limited to 'net/x25/x25_link.c')