From 2e33405785d3eaec303c54b4a10afdebf3729da7 Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Wed, 4 Apr 2012 15:01:42 -0400 Subject: SELinux: delay initialization of audit data in selinux_inode_permission We pay a rather large overhead initializing the common_audit_data. Since we only need this information if we actually emit an audit message there is little need to set it up in the hot path. This patch splits the functionality of avc_has_perm() into avc_has_perm_noaudit(), avc_audit_required() and slow_avc_audit(). But we take care of setting up to audit between required() and the actual audit call. Thus saving measurable time in a hot path. Signed-off-by: Stephen Smalley Signed-off-by: Eric Paris --- security/selinux/include/avc.h | 82 +++++++++++++++++++++++++++++++++++++++--- 1 file changed, 77 insertions(+), 5 deletions(-) (limited to 'security/selinux/include') diff --git a/security/selinux/include/avc.h b/security/selinux/include/avc.h index 1931370233d7..e4e50bb218ee 100644 --- a/security/selinux/include/avc.h +++ b/security/selinux/include/avc.h @@ -77,11 +77,83 @@ struct selinux_audit_data { void __init avc_init(void); -int avc_audit(u32 ssid, u32 tsid, - u16 tclass, u32 requested, - struct av_decision *avd, - int result, - struct common_audit_data *a, unsigned flags); +static inline u32 avc_audit_required(u32 requested, + struct av_decision *avd, + int result, + u32 auditdeny, + u32 *deniedp) +{ + u32 denied, audited; + denied = requested & ~avd->allowed; + if (unlikely(denied)) { + audited = denied & avd->auditdeny; + /* + * auditdeny is TRICKY! Setting a bit in + * this field means that ANY denials should NOT be audited if + * the policy contains an explicit dontaudit rule for that + * permission. Take notice that this is unrelated to the + * actual permissions that were denied. As an example lets + * assume: + * + * denied == READ + * avd.auditdeny & ACCESS == 0 (not set means explicit rule) + * auditdeny & ACCESS == 1 + * + * We will NOT audit the denial even though the denied + * permission was READ and the auditdeny checks were for + * ACCESS + */ + if (auditdeny && !(auditdeny & avd->auditdeny)) + audited = 0; + } else if (result) + audited = denied = requested; + else + audited = requested & avd->auditallow; + *deniedp = denied; + return audited; +} + +int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass, + u32 requested, u32 audited, u32 denied, + struct common_audit_data *a, + unsigned flags); + +/** + * avc_audit - Audit the granting or denial of permissions. + * @ssid: source security identifier + * @tsid: target security identifier + * @tclass: target security class + * @requested: requested permissions + * @avd: access vector decisions + * @result: result from avc_has_perm_noaudit + * @a: auxiliary audit data + * @flags: VFS walk flags + * + * Audit the granting or denial of permissions in accordance + * with the policy. This function is typically called by + * avc_has_perm() after a permission check, but can also be + * called directly by callers who use avc_has_perm_noaudit() + * in order to separate the permission check from the auditing. + * For example, this separation is useful when the permission check must + * be performed under a lock, to allow the lock to be released + * before calling the auditing code. + */ +static inline int avc_audit(u32 ssid, u32 tsid, + u16 tclass, u32 requested, + struct av_decision *avd, + int result, + struct common_audit_data *a, unsigned flags) +{ + u32 audited, denied; + audited = avc_audit_required(requested, avd, result, + a ? a->selinux_audit_data->auditdeny : 0, + &denied); + if (likely(!audited)) + return 0; + return slow_avc_audit(ssid, tsid, tclass, + requested, audited, denied, + a, flags); +} #define AVC_STRICT 1 /* Ignore permissive mode. */ int avc_has_perm_noaudit(u32 ssid, u32 tsid, -- cgit v1.2.1