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selinux: Report permissive mode in avc: denied messages. 

We cannot presently tell from an avc: denied message whether access was in
fact denied or was allowed due to global or per-domain permissive mode.
Add a permissive= field to the avc message to reflect this information.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Paul Moore <pmoore@redhat.com>
This commit is contained in:
Stephen Smalley 2014-04-29 11:29:04 -07:00 committed by Serge Hallyn
parent 2fd4e6698f
commit ca7786a2f9
3 changed files with 11 additions and 5 deletions
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7
security/selinux/avc.c
View File

@ -444,11 +444,15 @@ static void avc_audit_post_callback(struct audit_buffer *ab, void *a)
avc_dump_query(ab, ad->selinux_audit_data->ssid,
ad->selinux_audit_data->tsid,
ad->selinux_audit_data->tclass);
if (ad->selinux_audit_data->denied) {
audit_log_format(ab, " permissive=%u",
ad->selinux_audit_data->result ? 0 : 1);
}
}
/* This is the slow part of avc audit with big stack footprint */
noinline int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass,
u32 requested, u32 audited, u32 denied,
u32 requested, u32 audited, u32 denied, int result,
struct common_audit_data *a,
unsigned flags)
{
@ -477,6 +481,7 @@ noinline int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass,
sad.tsid = tsid;
sad.audited = audited;
sad.denied = denied;
sad.result = result;
a->selinux_audit_data = &sad;

5
security/selinux/hooks.c
View File

@ -2770,6 +2770,7 @@ static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *na
static noinline int audit_inode_permission(struct inode *inode,
u32 perms, u32 audited, u32 denied,
int result,
unsigned flags)
{
struct common_audit_data ad;
@ -2780,7 +2781,7 @@ static noinline int audit_inode_permission(struct inode *inode,
ad.u.inode = inode;
rc = slow_avc_audit(current_sid(), isec->sid, isec->sclass, perms,
audited, denied, &ad, flags);
audited, denied, result, &ad, flags);
if (rc)
return rc;
return 0;
@ -2822,7 +2823,7 @@ static int selinux_inode_permission(struct inode *inode, int mask)
if (likely(!audited))
return rc;
rc2 = audit_inode_permission(inode, perms, audited, denied, flags);
rc2 = audit_inode_permission(inode, perms, audited, denied, rc, flags);
if (rc2)
return rc2;
return rc;

4
security/selinux/include/avc.h
View File

@ -102,7 +102,7 @@ static inline u32 avc_audit_required(u32 requested,
}
int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass,
u32 requested, u32 audited, u32 denied,
u32 requested, u32 audited, u32 denied, int result,
struct common_audit_data *a,
unsigned flags);
@ -137,7 +137,7 @@ static inline int avc_audit(u32 ssid, u32 tsid,
if (likely(!audited))
return 0;
return slow_avc_audit(ssid, tsid, tclass,
requested, audited, denied,
requested, audited, denied, result,
a, 0);
}