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2c3c05dbcb
In security_get_user_sids, move the transition permission checks outside of the section holding the policy rdlock, and use the AVC to perform the checks, calling cond_resched after each one. These changes should allow preemption between the individual checks and enable caching of the results. It may however increase the overall time spent in the function in some cases, particularly in the cache miss case. The long term fix will be to take much of this logic to userspace by exporting additional state via selinuxfs, and ultimately deprecating and eliminating this interface from the kernel. Tested-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
140 lines
3.0 KiB
C
140 lines
3.0 KiB
C
/*
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* Access vector cache interface for object managers.
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*
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* Author : Stephen Smalley, <sds@epoch.ncsc.mil>
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*/
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#ifndef _SELINUX_AVC_H_
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#define _SELINUX_AVC_H_
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#include <linux/stddef.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/kdev_t.h>
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#include <linux/spinlock.h>
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#include <linux/init.h>
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#include <linux/in6.h>
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#include <asm/system.h>
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#include "flask.h"
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#include "av_permissions.h"
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#include "security.h"
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#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
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extern int selinux_enforcing;
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#else
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#define selinux_enforcing 1
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#endif
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/*
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* An entry in the AVC.
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*/
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struct avc_entry;
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struct task_struct;
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struct vfsmount;
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struct dentry;
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struct inode;
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struct sock;
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struct sk_buff;
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/* Auxiliary data to use in generating the audit record. */
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struct avc_audit_data {
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char type;
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#define AVC_AUDIT_DATA_FS 1
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#define AVC_AUDIT_DATA_NET 2
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#define AVC_AUDIT_DATA_CAP 3
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#define AVC_AUDIT_DATA_IPC 4
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struct task_struct *tsk;
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union {
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struct {
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struct vfsmount *mnt;
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struct dentry *dentry;
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struct inode *inode;
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} fs;
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struct {
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char *netif;
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struct sock *sk;
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u16 family;
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__be16 dport;
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__be16 sport;
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union {
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struct {
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__be32 daddr;
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__be32 saddr;
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} v4;
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struct {
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struct in6_addr daddr;
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struct in6_addr saddr;
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} v6;
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} fam;
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} net;
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int cap;
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int ipc_id;
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} u;
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};
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#define v4info fam.v4
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#define v6info fam.v6
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/* Initialize an AVC audit data structure. */
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#define AVC_AUDIT_DATA_INIT(_d,_t) \
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{ memset((_d), 0, sizeof(struct avc_audit_data)); (_d)->type = AVC_AUDIT_DATA_##_t; }
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/*
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* AVC statistics
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*/
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struct avc_cache_stats
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{
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unsigned int lookups;
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unsigned int hits;
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unsigned int misses;
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unsigned int allocations;
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unsigned int reclaims;
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unsigned int frees;
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};
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/*
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* AVC operations
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*/
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void __init avc_init(void);
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void avc_audit(u32 ssid, u32 tsid,
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u16 tclass, u32 requested,
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struct av_decision *avd, int result, struct avc_audit_data *auditdata);
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#define AVC_STRICT 1 /* Ignore permissive mode. */
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int avc_has_perm_noaudit(u32 ssid, u32 tsid,
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u16 tclass, u32 requested,
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unsigned flags,
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struct av_decision *avd);
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int avc_has_perm(u32 ssid, u32 tsid,
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u16 tclass, u32 requested,
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struct avc_audit_data *auditdata);
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#define AVC_CALLBACK_GRANT 1
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#define AVC_CALLBACK_TRY_REVOKE 2
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#define AVC_CALLBACK_REVOKE 4
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#define AVC_CALLBACK_RESET 8
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#define AVC_CALLBACK_AUDITALLOW_ENABLE 16
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#define AVC_CALLBACK_AUDITALLOW_DISABLE 32
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#define AVC_CALLBACK_AUDITDENY_ENABLE 64
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#define AVC_CALLBACK_AUDITDENY_DISABLE 128
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int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
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u16 tclass, u32 perms,
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u32 *out_retained),
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u32 events, u32 ssid, u32 tsid,
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u16 tclass, u32 perms);
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/* Exported to selinuxfs */
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int avc_get_hash_stats(char *page);
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extern unsigned int avc_cache_threshold;
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#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
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DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
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#endif
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#endif /* _SELINUX_AVC_H_ */
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