From: Ondrej Mosnacek <omosnace@redhat.com>
To: selinux@vger.kernel.org, Paul Moore <paul@paul-moore.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Subject: [PATCH 1/6] selinux: do not allocate ancillary buffer on first load
Date: Thu, 16 Jan 2020 13:04:34 +0100 [thread overview]
Message-ID: <20200116120439.303034-2-omosnace@redhat.com> (raw)
In-Reply-To: <20200116120439.303034-1-omosnace@redhat.com>
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>
---
security/selinux/ss/services.c | 28 +++++++++++++---------------
1 file changed, 13 insertions(+), 15 deletions(-)
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 55cf42945cba..42ca9f6dbbf4 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 (!state->initialized) {
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);
--
2.24.1
next prev parent reply other threads:[~2020-01-16 12:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-16 12:04 [PATCH 0/6] selinux: Assorted simplifications and cleanups Ondrej Mosnacek
2020-01-16 12:04 ` Ondrej Mosnacek [this message]
2020-01-16 16:02 ` [PATCH 1/6] selinux: do not allocate ancillary buffer on first load Stephen Smalley
2020-01-16 16:18 ` Ondrej Mosnacek
2020-01-16 21:57 ` Paul Moore
2020-01-16 16:34 ` Stephen Smalley
2020-01-16 12:04 ` [PATCH 2/6] selinux: simplify security_preserve_bools() Ondrej Mosnacek
2020-01-16 16:42 ` Stephen Smalley
2020-01-16 22:28 ` Paul Moore
2020-01-16 12:04 ` [PATCH 3/6] selinux: convert cond_list to array Ondrej Mosnacek
2020-01-16 17:07 ` Stephen Smalley
2020-01-16 12:04 ` [PATCH 4/6] selinux: convert cond_av_list " Ondrej Mosnacek
2020-01-16 17:13 ` Stephen Smalley
2020-01-16 12:04 ` [PATCH 5/6] selinux: convert cond_expr " Ondrej Mosnacek
2020-01-16 17:17 ` Stephen Smalley
2020-01-16 12:04 ` [PATCH 6/6] selinux: generalize evaluate_cond_node() Ondrej Mosnacek
2020-01-16 17:18 ` Stephen Smalley
2020-01-16 23:09 ` [PATCH 0/6] selinux: Assorted simplifications and cleanups Casey Schaufler
2020-01-16 23:59 ` Paul Moore
2020-01-17 0:49 ` Casey Schaufler
2020-01-17 0:56 ` Paul Moore
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