782ebb992e
This patch improves memory use by SELinux by both reducing the avtab node
size and reducing the number of avtab nodes. The memory savings are
substantial, e.g. on a 64-bit system after boot, James Morris reported the
following data for the targeted and strict policies:
#objs objsize kernmem
Targeted:
Before: 237888 40 9.1MB
After: 19968 24 468KB
Strict:
Before: 571680 40 21.81MB
After: 221052 24 5.06MB
The improvement in memory use comes at a cost in the speed of security
server computations of access vectors, but these computations are only
required on AVC cache misses, and performance measurements by James Morris
using a number of benchmarks have shown that the change does not cause any
significant degradation.
Note that a rebuilt policy via an updated policy toolchain
(libsepol/checkpolicy) is required in order to gain the full benefits of
this patch, although some memory savings benefits are immediately applied
even to older policies (in particular, the reduction in avtab node size).
Sources for the updated toolchain are presently available from the
sourceforge CVS tree (http://sourceforge.net/cvs/?group_id=21266), and
tarballs are available from http://www.flux.utah.edu/~sds.
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/*
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* Security server interface.
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*
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* Author : Stephen Smalley, <sds@epoch.ncsc.mil>
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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 "flask.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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#define SELINUX_MAGIC 0xf97cff8c
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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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/* 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_AVTAB
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#ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
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extern int selinux_enabled;
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#else
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#define selinux_enabled 1
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#endif
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extern int selinux_mls_enabled;
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int security_load_policy(void * data, size_t len);
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struct av_decision {
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u32 allowed;
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u32 decided;
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u32 auditallow;
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u32 auditdeny;
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u32 seqno;
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};
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int security_compute_av(u32 ssid, u32 tsid,
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u16 tclass, u32 requested,
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struct av_decision *avd);
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int security_transition_sid(u32 ssid, u32 tsid,
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u16 tclass, u32 *out_sid);
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int security_member_sid(u32 ssid, u32 tsid,
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u16 tclass, u32 *out_sid);
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int security_change_sid(u32 ssid, u32 tsid,
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u16 tclass, u32 *out_sid);
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int security_sid_to_context(u32 sid, char **scontext,
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u32 *scontext_len);
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int security_context_to_sid(char *scontext, u32 scontext_len,
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u32 *out_sid);
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int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *out_sid, u32 def_sid);
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int security_get_user_sids(u32 callsid, char *username,
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u32 **sids, u32 *nel);
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int security_port_sid(u16 domain, u16 type, u8 protocol, u16 port,
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u32 *out_sid);
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int security_netif_sid(char *name, u32 *if_sid,
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u32 *msg_sid);
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int security_node_sid(u16 domain, void *addr, u32 addrlen,
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u32 *out_sid);
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int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
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u16 tclass);
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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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int security_fs_use(const char *fstype, unsigned int *behavior,
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u32 *sid);
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int security_genfs_sid(const char *fstype, char *name, u16 sclass,
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u32 *sid);
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#endif /* _SELINUX_SECURITY_H_ */
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