Now that context hash computation no longer depends on policydb, we can
simplify things by moving the context hashing completely under sidtab.
The hash is still cached in sidtab entries, but not for the in-flight
context structures.
Signed-off-by: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
---
security/selinux/ss/context.h | 11 +--------
security/selinux/ss/policydb.c | 2 --
security/selinux/ss/services.c | 44 ++++++++++------------------------
security/selinux/ss/sidtab.c | 32 +++++++++++++++----------
security/selinux/ss/sidtab.h | 1 +
5 files changed, 34 insertions(+), 56 deletions(-)
diff --git a/security/selinux/ss/context.h b/security/selinux/ss/context.h
index e7ae7e21449b..62990aa1ec9e 100644
--- a/security/selinux/ss/context.h
+++ b/security/selinux/ss/context.h
@@ -31,7 +31,6 @@ struct context {
u32 len; /* length of string in bytes */
struct mls_range range;
char *str; /* string representation if context cannot be mapped. */
- u32 hash; /* a hash of the string representation */
};
static inline void mls_context_init(struct context *c)
@@ -169,13 +168,12 @@ static inline int context_cpy(struct context *dst, struct context *src)
kfree(dst->str);
return rc;
}
- dst->hash = src->hash;
return 0;
}
static inline void context_destroy(struct context *c)
{
- c->user = c->role = c->type = c->hash = 0;
+ c->user = c->role = c->type = 0;
kfree(c->str);
c->str = NULL;
c->len = 0;
@@ -184,8 +182,6 @@ static inline void context_destroy(struct context *c)
static inline int context_cmp(struct context *c1, struct context *c2)
{
- if (c1->hash && c2->hash && (c1->hash != c2->hash))
- return 0;
if (c1->len && c2->len)
return (c1->len == c2->len && !strcmp(c1->str, c2->str));
if (c1->len || c2->len)
@@ -198,10 +194,5 @@ static inline int context_cmp(struct context *c1, struct context *c2)
u32 context_compute_hash(const struct context *c);
-static inline void context_add_hash(struct context *context)
-{
- context->hash = context_compute_hash(context);
-}
-
#endif /* _SS_CONTEXT_H_ */
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index ac6c0a214fc5..f00f5851638f 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -836,8 +836,6 @@ int policydb_load_isids(struct policydb *p, struct sidtab *s)
if (!name)
continue;
- context_add_hash(&c->context[0]);
-
rc = sidtab_set_initial(s, sid, &c->context[0]);
if (rc) {
pr_err("SELinux: unable to load initial SID %s.\n",
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 2099355e9a7d..512cee09ee10 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1490,15 +1490,6 @@ out:
return rc;
}
-static int context_struct_to_sid(struct sidtab *sidtab, struct context *context,
- u32 *sid)
-{
- if (!context->hash)
- context_add_hash(context);
-
- return sidtab_context_to_sid(sidtab, context, sid);
-}
-
static int security_context_to_sid_core(struct selinux_state *state,
const char *scontext, u32 scontext_len,
u32 *sid, u32 def_sid, gfp_t gfp_flags,
@@ -1553,7 +1544,7 @@ static int security_context_to_sid_core(struct selinux_state *state,
str = NULL;
} else if (rc)
goto out_unlock;
- rc = context_struct_to_sid(sidtab, &context, sid);
+ rc = sidtab_context_to_sid(sidtab, &context, sid);
context_destroy(&context);
out_unlock:
read_unlock(&state->ss->policy_rwlock);
@@ -1864,7 +1855,7 @@ static int security_compute_sid(struct selinux_state *state,
goto out_unlock;
}
/* Obtain the sid for the context. */
- rc = context_struct_to_sid(sidtab, &newcontext, out_sid);
+ rc = sidtab_context_to_sid(sidtab, &newcontext, out_sid);
out_unlock:
read_unlock(&state->ss->policy_rwlock);
context_destroy(&newcontext);
@@ -2016,7 +2007,6 @@ static int convert_context(struct context *oldc, struct context *newc, void *p)
context_init(newc);
newc->str = s;
newc->len = oldc->len;
- newc->hash = oldc->hash;
return 0;
}
kfree(s);
@@ -2093,8 +2083,6 @@ static int convert_context(struct context *oldc, struct context *newc, void *p)
goto bad;
}
- context_add_hash(newc);
-
return 0;
bad:
/* Map old representation to string and save it. */
@@ -2104,7 +2092,6 @@ bad:
context_destroy(newc);
newc->str = s;
newc->len = len;
- context_add_hash(newc);
pr_info("SELinux: Context %s became invalid (unmapped).\n",
newc->str);
return 0;
@@ -2341,7 +2328,7 @@ int security_port_sid(struct selinux_state *state,
if (c) {
if (!c->sid[0]) {
- rc = context_struct_to_sid(sidtab, &c->context[0],
+ rc = sidtab_context_to_sid(sidtab, &c->context[0],
&c->sid[0]);
if (rc)
goto out;
@@ -2387,7 +2374,7 @@ int security_ib_pkey_sid(struct selinux_state *state,
if (c) {
if (!c->sid[0]) {
- rc = context_struct_to_sid(sidtab,
+ rc = sidtab_context_to_sid(sidtab,
&c->context[0],
&c->sid[0]);
if (rc)
@@ -2434,7 +2421,7 @@ int security_ib_endport_sid(struct selinux_state *state,
if (c) {
if (!c->sid[0]) {
- rc = context_struct_to_sid(sidtab, &c->context[0],
+ rc = sidtab_context_to_sid(sidtab, &c->context[0],
&c->sid[0]);
if (rc)
goto out;
@@ -2475,11 +2462,11 @@ int security_netif_sid(struct selinux_state *state,
if (c) {
if (!c->sid[0] || !c->sid[1]) {
- rc = context_struct_to_sid(sidtab, &c->context[0],
+ rc = sidtab_context_to_sid(sidtab, &c->context[0],
&c->sid[0]);
if (rc)
goto out;
- rc = context_struct_to_sid(sidtab, &c->context[1],
+ rc = sidtab_context_to_sid(sidtab, &c->context[1],
&c->sid[1]);
if (rc)
goto out;
@@ -2569,7 +2556,7 @@ int security_node_sid(struct selinux_state *state,
if (c) {
if (!c->sid[0]) {
- rc = context_struct_to_sid(sidtab,
+ rc = sidtab_context_to_sid(sidtab,
&c->context[0],
&c->sid[0]);
if (rc)
@@ -2653,17 +2640,12 @@ int security_get_user_sids(struct selinux_state *state,
usercon.role = i + 1;
ebitmap_for_each_positive_bit(&role->types, tnode, j) {
usercon.type = j + 1;
- /*
- * The same context struct is reused here so the hash
- * must be reset.
- */
- usercon.hash = 0;
if (mls_setup_user_range(policydb, fromcon, user,
&usercon))
continue;
- rc = context_struct_to_sid(sidtab, &usercon, &sid);
+ rc = sidtab_context_to_sid(sidtab, &usercon, &sid);
if (rc)
goto out_unlock;
if (mynel < maxnel) {
@@ -2769,7 +2751,7 @@ static inline int __security_genfs_sid(struct selinux_state *state,
goto out;
if (!c->sid[0]) {
- rc = context_struct_to_sid(sidtab, &c->context[0], &c->sid[0]);
+ rc = sidtab_context_to_sid(sidtab, &c->context[0], &c->sid[0]);
if (rc)
goto out;
}
@@ -2832,7 +2814,7 @@ int security_fs_use(struct selinux_state *state, struct super_block *sb)
if (c) {
sbsec->behavior = c->v.behavior;
if (!c->sid[0]) {
- rc = context_struct_to_sid(sidtab, &c->context[0],
+ rc = sidtab_context_to_sid(sidtab, &c->context[0],
&c->sid[0]);
if (rc)
goto out;
@@ -3080,7 +3062,7 @@ int security_sid_mls_copy(struct selinux_state *state,
goto out_unlock;
}
}
- rc = context_struct_to_sid(sidtab, &newcon, new_sid);
+ rc = sidtab_context_to_sid(sidtab, &newcon, new_sid);
out_unlock:
read_unlock(&state->ss->policy_rwlock);
context_destroy(&newcon);
@@ -3673,7 +3655,7 @@ int security_netlbl_secattr_to_sid(struct selinux_state *state,
if (!mls_context_isvalid(policydb, &ctx_new))
goto out_free;
- rc = context_struct_to_sid(sidtab, &ctx_new, sid);
+ rc = sidtab_context_to_sid(sidtab, &ctx_new, sid);
if (rc)
goto out_free;
diff --git a/security/selinux/ss/sidtab.c b/security/selinux/ss/sidtab.c
index a308ce1e6a13..8012a6f7ef89 100644
--- a/security/selinux/ss/sidtab.c
+++ b/security/selinux/ss/sidtab.c
@@ -54,14 +54,15 @@ int sidtab_init(struct sidtab *s)
return 0;
}
-static u32 context_to_sid(struct sidtab *s, struct context *context)
+static u32 context_to_sid(struct sidtab *s, struct context *context, u32 hash)
{
struct sidtab_entry *entry;
u32 sid = 0;
rcu_read_lock();
- hash_for_each_possible_rcu(s->context_to_sid, entry, list,
- context->hash) {
+ hash_for_each_possible_rcu(s->context_to_sid, entry, list, hash) {
+ if (entry->hash != hash)
+ continue;
if (context_cmp(&entry->context, context)) {
sid = entry->sid;
break;
@@ -74,6 +75,7 @@ static u32 context_to_sid(struct sidtab *s, struct context *context)
int sidtab_set_initial(struct sidtab *s, u32 sid, struct context *context)
{
struct sidtab_isid_entry *isid;
+ u32 hash;
int rc;
if (sid == 0 || sid > SECINITSID_NUM)
@@ -90,15 +92,18 @@ int sidtab_set_initial(struct sidtab *s, u32 sid, struct context *context)
#endif
isid->set = 1;
+ hash = context_compute_hash(context);
+
/*
* Multiple initial sids may map to the same context. Check that this
* context is not already represented in the context_to_sid hashtable
* to avoid duplicate entries and long linked lists upon hash
* collision.
*/
- if (!context_to_sid(s, context)) {
+ if (!context_to_sid(s, context, hash)) {
isid->entry.sid = sid;
- hash_add(s->context_to_sid, &isid->entry.list, context->hash);
+ isid->entry.hash = hash;
+ hash_add(s->context_to_sid, &isid->entry.list, hash);
}
return 0;
@@ -259,12 +264,12 @@ int sidtab_context_to_sid(struct sidtab *s, struct context *context,
u32 *sid)
{
unsigned long flags;
- u32 count;
+ u32 count, hash = context_compute_hash(context);
struct sidtab_convert_params *convert;
struct sidtab_entry *dst, *dst_convert;
int rc;
- *sid = context_to_sid(s, context);
+ *sid = context_to_sid(s, context, hash);
if (*sid)
return 0;
@@ -272,7 +277,7 @@ int sidtab_context_to_sid(struct sidtab *s, struct context *context,
spin_lock_irqsave(&s->lock, flags);
rc = 0;
- *sid = context_to_sid(s, context);
+ *sid = context_to_sid(s, context, hash);
if (*sid)
goto out_unlock;
@@ -292,6 +297,7 @@ int sidtab_context_to_sid(struct sidtab *s, struct context *context,
goto out_unlock;
dst->sid = index_to_sid(count);
+ dst->hash = hash;
rc = context_cpy(&dst->context, context);
if (rc)
@@ -316,10 +322,11 @@ int sidtab_context_to_sid(struct sidtab *s, struct context *context,
goto out_unlock;
}
dst_convert->sid = index_to_sid(count);
+ dst_convert->hash = context_compute_hash(&dst_convert->context);
convert->target->count = count + 1;
hash_add_rcu(convert->target->context_to_sid,
- &dst_convert->list, dst_convert->context.hash);
+ &dst_convert->list, dst_convert->hash);
}
if (context->len)
@@ -330,7 +337,7 @@ int sidtab_context_to_sid(struct sidtab *s, struct context *context,
/* write entries before updating count */
smp_store_release(&s->count, count + 1);
- hash_add_rcu(s->context_to_sid, &dst->list, dst->context.hash);
+ hash_add_rcu(s->context_to_sid, &dst->list, dst->hash);
rc = 0;
out_unlock:
@@ -346,10 +353,9 @@ static void sidtab_convert_hashtable(struct sidtab *s, u32 count)
for (i = 0; i < count; i++) {
entry = sidtab_do_lookup(s, i, 0);
entry->sid = index_to_sid(i);
+ entry->hash = context_compute_hash(&entry->context);
- hash_add_rcu(s->context_to_sid, &entry->list,
- entry->context.hash);
-
+ hash_add_rcu(s->context_to_sid, &entry->list, entry->hash);
}
}
diff --git a/security/selinux/ss/sidtab.h b/security/selinux/ss/sidtab.h
index 3311d9f236c0..f2a84560b8b3 100644
--- a/security/selinux/ss/sidtab.h
+++ b/security/selinux/ss/sidtab.h
@@ -19,6 +19,7 @@
struct sidtab_entry {
u32 sid;
+ u32 hash;
struct context context;
#if CONFIG_SECURITY_SELINUX_SID2STR_CACHE_SIZE > 0
struct sidtab_str_cache __rcu *cache;
--
2.25.2
