/* * NetLabel CALIPSO Support * * This file defines the CALIPSO functions for the NetLabel system. The * NetLabel system manages static and dynamic label mappings for network * protocols such as CIPSO and RIPSO. * * Authors: Paul Moore * Huw Davies * */ /* (c) Copyright Hewlett-Packard Development Company, L.P., 2006 * (c) Copyright Huw Davies , 2015 * * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see . * */ #ifndef _NETLABEL_CALIPSO #define _NETLABEL_CALIPSO #include #include /* The following NetLabel payloads are supported by the CALIPSO subsystem. * * o ADD: * Sent by an application to add a new DOI mapping table. * * Required attributes: * * NLBL_CALIPSO_A_DOI * NLBL_CALIPSO_A_MTYPE * * If using CALIPSO_MAP_PASS no additional attributes are required. * * o REMOVE: * Sent by an application to remove a specific DOI mapping table from the * CALIPSO system. * * Required attributes: * * NLBL_CALIPSO_A_DOI * * o LIST: * Sent by an application to list the details of a DOI definition. On * success the kernel should send a response using the following format. * * Required attributes: * * NLBL_CALIPSO_A_DOI * * The valid response message format depends on the type of the DOI mapping, * the defined formats are shown below. * * Required attributes: * * NLBL_CALIPSO_A_MTYPE * * If using CALIPSO_MAP_PASS no additional attributes are required. * * o LISTALL: * This message is sent by an application to list the valid DOIs on the * system. When sent by an application there is no payload and the * NLM_F_DUMP flag should be set. The kernel should respond with a series of * the following messages. * * Required attributes: * * NLBL_CALIPSO_A_DOI * NLBL_CALIPSO_A_MTYPE * */ /* NetLabel CALIPSO commands */ enum { NLBL_CALIPSO_C_UNSPEC, NLBL_CALIPSO_C_ADD, NLBL_CALIPSO_C_REMOVE, NLBL_CALIPSO_C_LIST, NLBL_CALIPSO_C_LISTALL, __NLBL_CALIPSO_C_MAX, }; /* NetLabel CALIPSO attributes */ enum { NLBL_CALIPSO_A_UNSPEC, NLBL_CALIPSO_A_DOI, /* (NLA_U32) * the DOI value */ NLBL_CALIPSO_A_MTYPE, /* (NLA_U32) * the mapping table type (defined in the calipso.h header as * CALIPSO_MAP_*) */ __NLBL_CALIPSO_A_MAX, }; #define NLBL_CALIPSO_A_MAX (__NLBL_CALIPSO_A_MAX - 1) /* NetLabel protocol functions */ #if IS_ENABLED(CONFIG_IPV6) int netlbl_calipso_genl_init(void); #else static inline int netlbl_calipso_genl_init(void) { return 0; } #endif int calipso_doi_add(struct calipso_doi *doi_def, struct netlbl_audit *audit_info); void calipso_doi_free(struct calipso_doi *doi_def); int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info); struct calipso_doi *calipso_doi_getdef(u32 doi); void calipso_doi_putdef(struct calipso_doi *doi_def); int calipso_doi_walk(u32 *skip_cnt, int (*callback)(struct calipso_doi *doi_def, void *arg), void *cb_arg); int calipso_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr); int calipso_sock_setattr(struct sock *sk, const struct calipso_doi *doi_def, const struct netlbl_lsm_secattr *secattr); void calipso_sock_delattr(struct sock *sk); int calipso_req_setattr(struct request_sock *req, const struct calipso_doi *doi_def, const struct netlbl_lsm_secattr *secattr); void calipso_req_delattr(struct request_sock *req); unsigned char *calipso_optptr(const struct sk_buff *skb); int calipso_getattr(const unsigned char *calipso, struct netlbl_lsm_secattr *secattr); int calipso_skbuff_setattr(struct sk_buff *skb, const struct calipso_doi *doi_def, const struct netlbl_lsm_secattr *secattr); int calipso_skbuff_delattr(struct sk_buff *skb); void calipso_cache_invalidate(void); int calipso_cache_add(const unsigned char *calipso_ptr, const struct netlbl_lsm_secattr *secattr); #endif ut type='submit' value='reload'/>
authorDouglas Miller <dougmill@linux.vnet.ibm.com>2017-01-28 06:42:20 -0600
committerTejun Heo <tj@kernel.org>2017-01-28 07:49:42 -0500
commit966d2b04e070bc040319aaebfec09e0144dc3341 (patch)
tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /sound/pci/hda/patch_via.c
parent1b1bc42c1692e9b62756323c675a44cb1a1f9dbd (diff)
percpu-refcount: fix reference leak during percpu-atomic transition
percpu_ref_tryget() and percpu_ref_tryget_live() should return "true" IFF they acquire a reference. But the return value from atomic_long_inc_not_zero() is a long and may have high bits set, e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines is bool so the reference may actually be acquired but the routines return "false" which results in a reference leak since the caller assumes it does not need to do a corresponding percpu_ref_put(). This was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'sound/pci/hda/patch_via.c')