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authorOndrej Mosnacek <omosnace@redhat.com>2020-01-16 13:04:34 +0100
committerPaul Moore <paul@paul-moore.com>2020-01-16 16:05:25 -0500
commitdd89b9d9f37decab85e000384d229abdcd9944ae (patch)
tree9375dc3bb6a32493cf1b965b6d5560036d253196 /security
parentselinux: remove redundant allocation and helper functions (diff)
downloadlinux-dev-dd89b9d9f37decab85e000384d229abdcd9944ae.tar.xz
linux-dev-dd89b9d9f37decab85e000384d229abdcd9944ae.zip
selinux: do not allocate ancillary buffer on first load
In security_load_policy(), we can defer allocating the newpolicydb ancillary array to after checking state->initialized, thereby avoiding the pointless allocation when loading policy the first time. Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com> [PM: merged portions by hand] Reviewed-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/ss/services.c28
1 files changed, 13 insertions, 15 deletions
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 0e8b94e8e156..216ce602a2b5 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -2183,26 +2183,17 @@ int security_load_policy(struct selinux_state *state, void *data, size_t len)
int rc = 0;
struct policy_file file = { data, len }, *fp = &file;
- oldpolicydb = kcalloc(2, sizeof(*oldpolicydb), GFP_KERNEL);
- if (!oldpolicydb) {
- rc = -ENOMEM;
- goto out;
- }
- newpolicydb = oldpolicydb + 1;
-
policydb = &state->ss->policydb;
newsidtab = kmalloc(sizeof(*newsidtab), GFP_KERNEL);
- if (!newsidtab) {
- rc = -ENOMEM;
- goto out;
- }
+ if (!newsidtab)
+ return -ENOMEM;
if (!selinux_initialized(state)) {
rc = policydb_read(policydb, fp);
if (rc) {
kfree(newsidtab);
- goto out;
+ return rc;
}
policydb->len = len;
@@ -2211,14 +2202,14 @@ int security_load_policy(struct selinux_state *state, void *data, size_t len)
if (rc) {
kfree(newsidtab);
policydb_destroy(policydb);
- goto out;
+ return rc;
}
rc = policydb_load_isids(policydb, newsidtab);
if (rc) {
kfree(newsidtab);
policydb_destroy(policydb);
- goto out;
+ return rc;
}
state->ss->sidtab = newsidtab;
@@ -2231,9 +2222,16 @@ int security_load_policy(struct selinux_state *state, void *data, size_t len)
selinux_status_update_policyload(state, seqno);
selinux_netlbl_cache_invalidate();
selinux_xfrm_notify_policyload();
- goto out;
+ return 0;
}
+ oldpolicydb = kcalloc(2, sizeof(*oldpolicydb), GFP_KERNEL);
+ if (!oldpolicydb) {
+ kfree(newsidtab);
+ return -ENOMEM;
+ }
+ newpolicydb = oldpolicydb + 1;
+
rc = policydb_read(newpolicydb, fp);
if (rc) {
kfree(newsidtab);