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selinux: inline some AVC functions used only once 

avc_dump_av() and avc_dump_query() are each used only in one place. Get
rid of them and open code their contents in the call sites.

Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Reviewed-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Ondrej Mosnacek 2019-01-25 11:06:48 +01:00 committed by Paul Moore
parent 53e0c2aa9a
commit a2c513835b
1 changed files with 58 additions and 82 deletions
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140
security/selinux/avc.c
View File

@ -129,75 +129,6 @@ static inline int avc_hash(u32 ssid, u32 tsid, u16 tclass)
return (ssid ^ (tsid<<2) ^ (tclass<<4)) & (AVC_CACHE_SLOTS - 1);
}
/**
* avc_dump_av - Display an access vector in human-readable form.
* @tclass: target security class
* @av: access vector
*/
static void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av)
{
const char **perms;
int i, perm;
if (av == 0) {
audit_log_format(ab, " null");
return;
}
BUG_ON(!tclass || tclass >= ARRAY_SIZE(secclass_map));
perms = secclass_map[tclass-1].perms;
audit_log_format(ab, " {");
i = 0;
perm = 1;
while (i < (sizeof(av) * 8)) {
if ((perm & av) && perms[i]) {
audit_log_format(ab, " %s", perms[i]);
av &= ~perm;
}
i++;
perm <<= 1;
}
if (av)
audit_log_format(ab, " 0x%x", av);
audit_log_format(ab, " }");
}
/**
* avc_dump_query - Display a SID pair and a class in human-readable form.
* @ssid: source security identifier
* @tsid: target security identifier
* @tclass: target security class
*/
static void avc_dump_query(struct audit_buffer *ab, struct selinux_state *state,
u32 ssid, u32 tsid, u16 tclass)
{
int rc;
char *scontext;
u32 scontext_len;
rc = security_sid_to_context(state, ssid, &scontext, &scontext_len);
if (rc)
audit_log_format(ab, "ssid=%d", ssid);
else {
audit_log_format(ab, "scontext=%s", scontext);
kfree(scontext);
}
rc = security_sid_to_context(state, tsid, &scontext, &scontext_len);
if (rc)
audit_log_format(ab, " tsid=%d", tsid);
else {
audit_log_format(ab, " tcontext=%s", scontext);
kfree(scontext);
}
BUG_ON(!tclass || tclass >= ARRAY_SIZE(secclass_map));
audit_log_format(ab, " tclass=%s", secclass_map[tclass-1].name);
}
/**
* avc_init - Initialize the AVC.
*
@ -735,11 +666,37 @@ out:
static void avc_audit_pre_callback(struct audit_buffer *ab, void *a)
{
struct common_audit_data *ad = a;
audit_log_format(ab, "avc: %s ",
ad->selinux_audit_data->denied ? "denied" : "granted");
avc_dump_av(ab, ad->selinux_audit_data->tclass,
ad->selinux_audit_data->audited);
audit_log_format(ab, " for ");
struct selinux_audit_data *sad = ad->selinux_audit_data;
u32 av = sad->audited;
const char **perms;
int i, perm;
audit_log_format(ab, "avc: %s ", sad->denied ? "denied" : "granted");
if (av == 0) {
audit_log_string(ab, " null");
return;
}
BUG_ON(!sad->tclass || sad->tclass >= ARRAY_SIZE(secclass_map));
perms = secclass_map[sad->tclass-1].perms;
audit_log_string(ab, " {");
i = 0;
perm = 1;
while (i < (sizeof(av) * 8)) {
if ((perm & av) && perms[i]) {
audit_log_format(ab, " %s", perms[i]);
av &= ~perm;
}
i++;
perm <<= 1;
}
if (av)
audit_log_format(ab, " 0x%x", av);
audit_log_string(ab, " } for ");
}
/**
@ -751,15 +708,34 @@ static void avc_audit_pre_callback(struct audit_buffer *ab, void *a)
static void avc_audit_post_callback(struct audit_buffer *ab, void *a)
{
struct common_audit_data *ad = a;
audit_log_format(ab, " ");
avc_dump_query(ab, ad->selinux_audit_data->state,
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);
struct selinux_audit_data *sad = ad->selinux_audit_data;
char *scontext;
u32 scontext_len;
int rc;
rc = security_sid_to_context(sad->state, sad->ssid, &scontext,
&scontext_len);
if (rc)
audit_log_format(ab, " ssid=%d", sad->ssid);
else {
audit_log_format(ab, " scontext=%s", scontext);
kfree(scontext);
}
rc = security_sid_to_context(sad->state, sad->tsid, &scontext,
&scontext_len);
if (rc)
audit_log_format(ab, " tsid=%d", sad->tsid);
else {
audit_log_format(ab, " tcontext=%s", scontext);
kfree(scontext);
}
BUG_ON(!sad->tclass || sad->tclass >= ARRAY_SIZE(secclass_map));
audit_log_format(ab, " tclass=%s", secclass_map[sad->tclass-1].name);
if (sad->denied)
audit_log_format(ab, " permissive=%u", sad->result ? 0 : 1);
}
/* This is the slow part of avc audit with big stack footprint */