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selinux: avoid implicit conversions in the AVC code 

Use a consistent type of u32 for sequence numbers.

Use a non-negative and input parameter matching type for the hash
result.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
[PM: subject line tweaks]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Christian Göttsche 2023-07-06 15:23:26 +02:00 committed by Paul Moore
parent 777ea29c57
commit 5f740953ab
1 changed files with 8 additions and 7 deletions
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15
security/selinux/avc.c
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@ -122,7 +122,7 @@ static struct kmem_cache *avc_xperms_data_cachep __ro_after_init;
static struct kmem_cache *avc_xperms_decision_cachep __ro_after_init;
static struct kmem_cache *avc_xperms_cachep __ro_after_init;
static inline int avc_hash(u32 ssid, u32 tsid, u16 tclass)
static inline u32 avc_hash(u32 ssid, u32 tsid, u16 tclass)
{
return (ssid ^ (tsid<<2) ^ (tclass<<4)) & (AVC_CACHE_SLOTS - 1);
}
@ -523,7 +523,7 @@ static void avc_node_populate(struct avc_node *node, u32 ssid, u32 tsid, u16 tcl
static inline struct avc_node *avc_search_node(u32 ssid, u32 tsid, u16 tclass)
{
struct avc_node *node, *ret = NULL;
int hvalue;
u32 hvalue;
struct hlist_head *head;
hvalue = avc_hash(ssid, tsid, tclass);
@ -566,7 +566,7 @@ static struct avc_node *avc_lookup(u32 ssid, u32 tsid, u16 tclass)
return NULL;
}
static int avc_latest_notif_update(int seqno, int is_insert)
static int avc_latest_notif_update(u32 seqno, int is_insert)
{
int ret = 0;
static DEFINE_SPINLOCK(notif_lock);
@ -609,7 +609,7 @@ static void avc_insert(u32 ssid, u32 tsid, u16 tclass,
struct av_decision *avd, struct avc_xperms_node *xp_node)
{
struct avc_node *pos, *node = NULL;
int hvalue;
u32 hvalue;
unsigned long flag;
spinlock_t *lock;
struct hlist_head *head;
@ -654,9 +654,9 @@ static void avc_audit_pre_callback(struct audit_buffer *ab, void *a)
{
struct common_audit_data *ad = a;
struct selinux_audit_data *sad = ad->selinux_audit_data;
u32 av = sad->audited;
u32 av = sad->audited, perm;
const char *const *perms;
int i, perm;
u32 i;
audit_log_format(ab, "avc: %s ", sad->denied ? "denied" : "granted");
@ -833,7 +833,8 @@ static int avc_update_node(u32 event, u32 perms, u8 driver, u8 xperm, u32 ssid,
struct extended_perms_decision *xpd,
u32 flags)
{
int hvalue, rc = 0;
u32 hvalue;
int rc = 0;
unsigned long flag;
struct avc_node *pos, *node, *orig = NULL;
struct hlist_head *head;