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SELinux: security_load_policy: Silence frame-larger-than warning 

Dynamically allocate a couple of the larger stack variables in order to
reduce the stack footprint below 1024. gcc-4.8

security/selinux/ss/services.c: In function 'security_load_policy':
security/selinux/ss/services.c:1964:1: warning: the frame size of 1104 bytes is larger than 1024 bytes [-Wframe-larger-than=]
 }

Also silence a couple of checkpatch warnings at the same time.

WARNING: sizeof policydb should be sizeof(policydb)
+	memcpy(oldpolicydb, &policydb, sizeof policydb);

WARNING: sizeof policydb should be sizeof(policydb)
+	memcpy(&policydb, newpolicydb, sizeof policydb);

Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Eric Paris <eparis@parisplace.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Paul Moore <pmoore@redhat.com>
This commit is contained in:
Tim Gardner 2013-11-14 15:04:51 -07:00 committed by Paul Moore
parent a660bec1d8
commit b5495b4217
1 changed files with 32 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
security/selinux/ss/services.c
View File

@ -1831,7 +1831,7 @@ static int security_preserve_bools(struct policydb *p);
*/
int security_load_policy(void *data, size_t len)
{
struct policydb oldpolicydb, newpolicydb;
struct policydb *oldpolicydb, *newpolicydb;
struct sidtab oldsidtab, newsidtab;
struct selinux_mapping *oldmap, *map = NULL;
struct convert_context_args args;
@ -1840,12 +1840,19 @@ int security_load_policy(void *data, size_t len)
int rc = 0;
struct policy_file file = { data, len }, *fp = &file;
oldpolicydb = kzalloc(2 * sizeof(*oldpolicydb), GFP_KERNEL);
if (!oldpolicydb) {
rc = -ENOMEM;
goto out;
}
newpolicydb = oldpolicydb + 1;
if (!ss_initialized) {
avtab_cache_init();
rc = policydb_read(&policydb, fp);
if (rc) {
avtab_cache_destroy();
return rc;
goto out;
}
policydb.len = len;
@ -1855,14 +1862,14 @@ int security_load_policy(void *data, size_t len)
if (rc) {
policydb_destroy(&policydb);
avtab_cache_destroy();
return rc;
goto out;
}
rc = policydb_load_isids(&policydb, &sidtab);
if (rc) {
policydb_destroy(&policydb);
avtab_cache_destroy();
return rc;
goto out;
}
security_load_policycaps();
@ -1874,36 +1881,36 @@ int security_load_policy(void *data, size_t len)
selinux_status_update_policyload(seqno);
selinux_netlbl_cache_invalidate();
selinux_xfrm_notify_policyload();
return 0;
goto out;
}
#if 0
sidtab_hash_eval(&sidtab, "sids");
#endif
rc = policydb_read(&newpolicydb, fp);
rc = policydb_read(newpolicydb, fp);
if (rc)
return rc;
goto out;
newpolicydb.len = len;
newpolicydb->len = len;
/* If switching between different policy types, log MLS status */
if (policydb.mls_enabled && !newpolicydb.mls_enabled)
if (policydb.mls_enabled && !newpolicydb->mls_enabled)
printk(KERN_INFO "SELinux: Disabling MLS support...\n");
else if (!policydb.mls_enabled && newpolicydb.mls_enabled)
else if (!policydb.mls_enabled && newpolicydb->mls_enabled)
printk(KERN_INFO "SELinux: Enabling MLS support...\n");
rc = policydb_load_isids(&newpolicydb, &newsidtab);
rc = policydb_load_isids(newpolicydb, &newsidtab);
if (rc) {
printk(KERN_ERR "SELinux: unable to load the initial SIDs\n");
policydb_destroy(&newpolicydb);
return rc;
policydb_destroy(newpolicydb);
goto out;
}
rc = selinux_set_mapping(&newpolicydb, secclass_map, &map, &map_size);
rc = selinux_set_mapping(newpolicydb, secclass_map, &map, &map_size);
if (rc)
goto err;
rc = security_preserve_bools(&newpolicydb);
rc = security_preserve_bools(newpolicydb);
if (rc) {
printk(KERN_ERR "SELinux: unable to preserve booleans\n");
goto err;
@ -1921,7 +1928,7 @@ int security_load_policy(void *data, size_t len)
* in the new SID table.
*/
args.oldp = &policydb;
args.newp = &newpolicydb;
args.newp = newpolicydb;
rc = sidtab_map(&newsidtab, convert_context, &args);
if (rc) {
printk(KERN_ERR "SELinux: unable to convert the internal"
@ -1931,12 +1938,12 @@ int security_load_policy(void *data, size_t len)
}
/* Save the old policydb and SID table to free later. */
memcpy(&oldpolicydb, &policydb, sizeof policydb);
memcpy(oldpolicydb, &policydb, sizeof(policydb));
sidtab_set(&oldsidtab, &sidtab);
/* Install the new policydb and SID table. */
write_lock_irq(&policy_rwlock);
memcpy(&policydb, &newpolicydb, sizeof policydb);
memcpy(&policydb, newpolicydb, sizeof(policydb));
sidtab_set(&sidtab, &newsidtab);
security_load_policycaps();
oldmap = current_mapping;
@ -1946,7 +1953,7 @@ int security_load_policy(void *data, size_t len)
write_unlock_irq(&policy_rwlock);
/* Free the old policydb and SID table. */
policydb_destroy(&oldpolicydb);
policydb_destroy(oldpolicydb);
sidtab_destroy(&oldsidtab);
kfree(oldmap);
@ -1956,14 +1963,17 @@ int security_load_policy(void *data, size_t len)
selinux_netlbl_cache_invalidate();
selinux_xfrm_notify_policyload();
return 0;
rc = 0;
goto out;
err:
kfree(map);
sidtab_destroy(&newsidtab);
policydb_destroy(&newpolicydb);
return rc;
policydb_destroy(newpolicydb);
out:
kfree(oldpolicydb);
return rc;
}
size_t security_policydb_len(void)