forked from luck/tmp_suning_uos_patched
1b8b31a2e6
Convert the policy read-write lock to RCU. This is significantly simplified by the earlier work to encapsulate the policy data structures and refactor the policy load and boolean setting logic. Move the latest_granting sequence number into the selinux_policy structure so that it can be updated atomically with the policy. Since removing the policy rwlock and moving latest_granting reduces the selinux_ss structure to nothing more than a wrapper around the selinux_policy pointer, get rid of the extra layer of indirection. At present this change merely passes a hardcoded 1 to rcu_dereference_check() in the cases where we know we do not need to take rcu_read_lock(), with the preceding comment explaining why. Alternatively we could pass fsi->mutex down from selinuxfs and apply a lockdep check on it instead. Based in part on earlier attempts to convert the policy rwlock to RCU by Kaigai Kohei [1] and by Peter Enderborg [2]. [1] https://lore.kernel.org/selinux/6e2f9128-e191-ebb3-0e87-74bfccb0767f@tycho.nsa.gov/ [2] https://lore.kernel.org/selinux/20180530141104.28569-1-peter.enderborg@sony.com/ Signed-off-by: Stephen Smalley <stephen.smalley.work@gmail.com> Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
440 lines
13 KiB
C
440 lines
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Security server interface.
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*
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* Author : Stephen Smalley, <sds@tycho.nsa.gov>
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*
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*/
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#ifndef _SELINUX_SECURITY_H_
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#define _SELINUX_SECURITY_H_
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#include <linux/compiler.h>
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#include <linux/dcache.h>
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#include <linux/magic.h>
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#include <linux/types.h>
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#include <linux/rcupdate.h>
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#include <linux/refcount.h>
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#include <linux/workqueue.h>
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#include "flask.h"
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#include "policycap.h"
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#define SECSID_NULL 0x00000000 /* unspecified SID */
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#define SECSID_WILD 0xffffffff /* wildcard SID */
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#define SECCLASS_NULL 0x0000 /* no class */
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/* Identify specific policy version changes */
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#define POLICYDB_VERSION_BASE 15
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#define POLICYDB_VERSION_BOOL 16
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#define POLICYDB_VERSION_IPV6 17
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#define POLICYDB_VERSION_NLCLASS 18
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#define POLICYDB_VERSION_VALIDATETRANS 19
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#define POLICYDB_VERSION_MLS 19
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#define POLICYDB_VERSION_AVTAB 20
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#define POLICYDB_VERSION_RANGETRANS 21
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#define POLICYDB_VERSION_POLCAP 22
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#define POLICYDB_VERSION_PERMISSIVE 23
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#define POLICYDB_VERSION_BOUNDARY 24
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#define POLICYDB_VERSION_FILENAME_TRANS 25
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#define POLICYDB_VERSION_ROLETRANS 26
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#define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27
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#define POLICYDB_VERSION_DEFAULT_TYPE 28
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#define POLICYDB_VERSION_CONSTRAINT_NAMES 29
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#define POLICYDB_VERSION_XPERMS_IOCTL 30
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#define POLICYDB_VERSION_INFINIBAND 31
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#define POLICYDB_VERSION_GLBLUB 32
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#define POLICYDB_VERSION_COMP_FTRANS 33 /* compressed filename transitions */
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/* Range of policy versions we understand*/
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#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
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#define POLICYDB_VERSION_MAX POLICYDB_VERSION_COMP_FTRANS
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/* Mask for just the mount related flags */
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#define SE_MNTMASK 0x0f
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/* Super block security struct flags for mount options */
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/* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
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#define CONTEXT_MNT 0x01
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#define FSCONTEXT_MNT 0x02
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#define ROOTCONTEXT_MNT 0x04
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#define DEFCONTEXT_MNT 0x08
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#define SBLABEL_MNT 0x10
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/* Non-mount related flags */
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#define SE_SBINITIALIZED 0x0100
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#define SE_SBPROC 0x0200
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#define SE_SBGENFS 0x0400
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#define SE_SBGENFS_XATTR 0x0800
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#define CONTEXT_STR "context"
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#define FSCONTEXT_STR "fscontext"
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#define ROOTCONTEXT_STR "rootcontext"
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#define DEFCONTEXT_STR "defcontext"
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#define SECLABEL_STR "seclabel"
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struct netlbl_lsm_secattr;
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extern int selinux_enabled_boot;
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/*
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* type_datum properties
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* available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
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*/
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#define TYPEDATUM_PROPERTY_PRIMARY 0x0001
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#define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
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/* limitation of boundary depth */
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#define POLICYDB_BOUNDS_MAXDEPTH 4
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struct selinux_avc;
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struct selinux_policy;
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struct selinux_state {
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#ifdef CONFIG_SECURITY_SELINUX_DISABLE
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bool disabled;
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#endif
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#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
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bool enforcing;
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#endif
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bool checkreqprot;
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bool initialized;
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bool policycap[__POLICYDB_CAPABILITY_MAX];
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struct page *status_page;
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struct mutex status_lock;
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struct selinux_avc *avc;
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struct selinux_policy __rcu *policy;
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} __randomize_layout;
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void selinux_avc_init(struct selinux_avc **avc);
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extern struct selinux_state selinux_state;
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static inline bool selinux_initialized(const struct selinux_state *state)
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{
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/* do a synchronized load to avoid race conditions */
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return smp_load_acquire(&state->initialized);
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}
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static inline void selinux_mark_initialized(struct selinux_state *state)
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{
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/* do a synchronized write to avoid race conditions */
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smp_store_release(&state->initialized, true);
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}
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#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
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static inline bool enforcing_enabled(struct selinux_state *state)
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{
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return READ_ONCE(state->enforcing);
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}
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static inline void enforcing_set(struct selinux_state *state, bool value)
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{
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WRITE_ONCE(state->enforcing, value);
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}
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#else
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static inline bool enforcing_enabled(struct selinux_state *state)
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{
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return true;
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}
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static inline void enforcing_set(struct selinux_state *state, bool value)
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{
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}
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#endif
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#ifdef CONFIG_SECURITY_SELINUX_DISABLE
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static inline bool selinux_disabled(struct selinux_state *state)
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{
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return READ_ONCE(state->disabled);
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}
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static inline void selinux_mark_disabled(struct selinux_state *state)
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{
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WRITE_ONCE(state->disabled, true);
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}
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#else
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static inline bool selinux_disabled(struct selinux_state *state)
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{
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return false;
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}
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#endif
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static inline bool selinux_policycap_netpeer(void)
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{
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struct selinux_state *state = &selinux_state;
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return state->policycap[POLICYDB_CAPABILITY_NETPEER];
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}
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static inline bool selinux_policycap_openperm(void)
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{
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struct selinux_state *state = &selinux_state;
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return state->policycap[POLICYDB_CAPABILITY_OPENPERM];
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}
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static inline bool selinux_policycap_extsockclass(void)
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{
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struct selinux_state *state = &selinux_state;
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return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS];
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}
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static inline bool selinux_policycap_alwaysnetwork(void)
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{
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struct selinux_state *state = &selinux_state;
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return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK];
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}
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static inline bool selinux_policycap_cgroupseclabel(void)
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{
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struct selinux_state *state = &selinux_state;
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return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL];
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}
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static inline bool selinux_policycap_nnp_nosuid_transition(void)
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{
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struct selinux_state *state = &selinux_state;
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return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION];
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}
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static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
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{
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struct selinux_state *state = &selinux_state;
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return state->policycap[POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS];
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}
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int security_mls_enabled(struct selinux_state *state);
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int security_load_policy(struct selinux_state *state,
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void *data, size_t len,
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struct selinux_policy **newpolicyp);
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void selinux_policy_commit(struct selinux_state *state,
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struct selinux_policy *newpolicy);
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void selinux_policy_cancel(struct selinux_state *state,
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struct selinux_policy *policy);
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int security_read_policy(struct selinux_state *state,
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void **data, size_t *len);
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size_t security_policydb_len(struct selinux_state *state);
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int security_policycap_supported(struct selinux_state *state,
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unsigned int req_cap);
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#define SEL_VEC_MAX 32
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struct av_decision {
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u32 allowed;
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u32 auditallow;
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u32 auditdeny;
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u32 seqno;
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u32 flags;
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};
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#define XPERMS_ALLOWED 1
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#define XPERMS_AUDITALLOW 2
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#define XPERMS_DONTAUDIT 4
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#define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
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#define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
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struct extended_perms_data {
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u32 p[8];
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};
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struct extended_perms_decision {
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u8 used;
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u8 driver;
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struct extended_perms_data *allowed;
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struct extended_perms_data *auditallow;
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struct extended_perms_data *dontaudit;
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};
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struct extended_perms {
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u16 len; /* length associated decision chain */
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struct extended_perms_data drivers; /* flag drivers that are used */
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};
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/* definitions of av_decision.flags */
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#define AVD_FLAGS_PERMISSIVE 0x0001
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void security_compute_av(struct selinux_state *state,
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u32 ssid, u32 tsid,
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u16 tclass, struct av_decision *avd,
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struct extended_perms *xperms);
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void security_compute_xperms_decision(struct selinux_state *state,
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u32 ssid, u32 tsid, u16 tclass,
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u8 driver,
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struct extended_perms_decision *xpermd);
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void security_compute_av_user(struct selinux_state *state,
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u32 ssid, u32 tsid,
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u16 tclass, struct av_decision *avd);
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int security_transition_sid(struct selinux_state *state,
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u32 ssid, u32 tsid, u16 tclass,
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const struct qstr *qstr, u32 *out_sid);
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int security_transition_sid_user(struct selinux_state *state,
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u32 ssid, u32 tsid, u16 tclass,
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const char *objname, u32 *out_sid);
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int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
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u16 tclass, u32 *out_sid);
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int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
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u16 tclass, u32 *out_sid);
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int security_sid_to_context(struct selinux_state *state, u32 sid,
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char **scontext, u32 *scontext_len);
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int security_sid_to_context_force(struct selinux_state *state,
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u32 sid, char **scontext, u32 *scontext_len);
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int security_sid_to_context_inval(struct selinux_state *state,
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u32 sid, char **scontext, u32 *scontext_len);
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int security_context_to_sid(struct selinux_state *state,
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const char *scontext, u32 scontext_len,
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u32 *out_sid, gfp_t gfp);
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int security_context_str_to_sid(struct selinux_state *state,
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const char *scontext, u32 *out_sid, gfp_t gfp);
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int security_context_to_sid_default(struct selinux_state *state,
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const char *scontext, u32 scontext_len,
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u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
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int security_context_to_sid_force(struct selinux_state *state,
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const char *scontext, u32 scontext_len,
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u32 *sid);
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int security_get_user_sids(struct selinux_state *state,
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u32 callsid, char *username,
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u32 **sids, u32 *nel);
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int security_port_sid(struct selinux_state *state,
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u8 protocol, u16 port, u32 *out_sid);
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int security_ib_pkey_sid(struct selinux_state *state,
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u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
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int security_ib_endport_sid(struct selinux_state *state,
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const char *dev_name, u8 port_num, u32 *out_sid);
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int security_netif_sid(struct selinux_state *state,
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char *name, u32 *if_sid);
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int security_node_sid(struct selinux_state *state,
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u16 domain, void *addr, u32 addrlen,
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u32 *out_sid);
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int security_validate_transition(struct selinux_state *state,
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u32 oldsid, u32 newsid, u32 tasksid,
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u16 tclass);
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int security_validate_transition_user(struct selinux_state *state,
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u32 oldsid, u32 newsid, u32 tasksid,
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u16 tclass);
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int security_bounded_transition(struct selinux_state *state,
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u32 oldsid, u32 newsid);
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int security_sid_mls_copy(struct selinux_state *state,
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u32 sid, u32 mls_sid, u32 *new_sid);
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int security_net_peersid_resolve(struct selinux_state *state,
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u32 nlbl_sid, u32 nlbl_type,
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u32 xfrm_sid,
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u32 *peer_sid);
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int security_get_classes(struct selinux_policy *policy,
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char ***classes, int *nclasses);
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int security_get_permissions(struct selinux_policy *policy,
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char *class, char ***perms, int *nperms);
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int security_get_reject_unknown(struct selinux_state *state);
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int security_get_allow_unknown(struct selinux_state *state);
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#define SECURITY_FS_USE_XATTR 1 /* use xattr */
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#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
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#define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
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#define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
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#define SECURITY_FS_USE_NONE 5 /* no labeling support */
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#define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
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#define SECURITY_FS_USE_NATIVE 7 /* use native label support */
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#define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
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int security_fs_use(struct selinux_state *state, struct super_block *sb);
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int security_genfs_sid(struct selinux_state *state,
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const char *fstype, char *name, u16 sclass,
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u32 *sid);
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int selinux_policy_genfs_sid(struct selinux_policy *policy,
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const char *fstype, char *name, u16 sclass,
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u32 *sid);
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#ifdef CONFIG_NETLABEL
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int security_netlbl_secattr_to_sid(struct selinux_state *state,
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struct netlbl_lsm_secattr *secattr,
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u32 *sid);
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int security_netlbl_sid_to_secattr(struct selinux_state *state,
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u32 sid,
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struct netlbl_lsm_secattr *secattr);
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#else
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static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
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struct netlbl_lsm_secattr *secattr,
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u32 *sid)
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{
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return -EIDRM;
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}
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static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
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u32 sid,
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struct netlbl_lsm_secattr *secattr)
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{
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return -ENOENT;
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}
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#endif /* CONFIG_NETLABEL */
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const char *security_get_initial_sid_context(u32 sid);
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/*
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* status notifier using mmap interface
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*/
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extern struct page *selinux_kernel_status_page(struct selinux_state *state);
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#define SELINUX_KERNEL_STATUS_VERSION 1
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struct selinux_kernel_status {
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u32 version; /* version number of thie structure */
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u32 sequence; /* sequence number of seqlock logic */
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u32 enforcing; /* current setting of enforcing mode */
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u32 policyload; /* times of policy reloaded */
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u32 deny_unknown; /* current setting of deny_unknown */
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/*
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* The version > 0 supports above members.
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*/
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} __packed;
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extern void selinux_status_update_setenforce(struct selinux_state *state,
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int enforcing);
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extern void selinux_status_update_policyload(struct selinux_state *state,
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int seqno);
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extern void selinux_complete_init(void);
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extern int selinux_disable(struct selinux_state *state);
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extern void exit_sel_fs(void);
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extern struct path selinux_null;
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extern struct vfsmount *selinuxfs_mount;
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extern void selnl_notify_setenforce(int val);
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extern void selnl_notify_policyload(u32 seqno);
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extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
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extern void avtab_cache_init(void);
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extern void ebitmap_cache_init(void);
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extern void hashtab_cache_init(void);
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extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
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#endif /* _SELINUX_SECURITY_H_ */
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