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authorMichal Hocko <mhocko@kernel.org>2017-08-03 10:11:52 +0200
committerPaul Moore <paul@paul-moore.com>2017-08-08 09:12:23 -0400
commit476accbe2f6ef69caeebe99f52a286e12ac35aee (patch)
treefa8f78eebbc6c5657634751906db4d445359cce5 /security
parentaf63f4193f9fbbbac50fc766417d74735afd87ef (diff)
downloadop-kernel-dev-476accbe2f6ef69caeebe99f52a286e12ac35aee.zip
op-kernel-dev-476accbe2f6ef69caeebe99f52a286e12ac35aee.tar.gz
selinux: use GFP_NOWAIT in the AVC kmem_caches
There is a strange __GFP_NOMEMALLOC usage pattern in SELinux, specifically GFP_ATOMIC | __GFP_NOMEMALLOC which doesn't make much sense. GFP_ATOMIC on its own allows to access memory reserves while __GFP_NOMEMALLOC dictates we cannot use memory reserves. Replace this with the much more sane GFP_NOWAIT in the AVC code as we can tolerate memory allocation failures in that code. Signed-off-by: Michal Hocko <mhocko@kernel.org> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/avc.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index e60c79d..52f3c55 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -348,27 +348,26 @@ static struct avc_xperms_decision_node
struct avc_xperms_decision_node *xpd_node;
struct extended_perms_decision *xpd;
- xpd_node = kmem_cache_zalloc(avc_xperms_decision_cachep,
- GFP_ATOMIC | __GFP_NOMEMALLOC);
+ xpd_node = kmem_cache_zalloc(avc_xperms_decision_cachep, GFP_NOWAIT);
if (!xpd_node)
return NULL;
xpd = &xpd_node->xpd;
if (which & XPERMS_ALLOWED) {
xpd->allowed = kmem_cache_zalloc(avc_xperms_data_cachep,
- GFP_ATOMIC | __GFP_NOMEMALLOC);
+ GFP_NOWAIT);
if (!xpd->allowed)
goto error;
}
if (which & XPERMS_AUDITALLOW) {
xpd->auditallow = kmem_cache_zalloc(avc_xperms_data_cachep,
- GFP_ATOMIC | __GFP_NOMEMALLOC);
+ GFP_NOWAIT);
if (!xpd->auditallow)
goto error;
}
if (which & XPERMS_DONTAUDIT) {
xpd->dontaudit = kmem_cache_zalloc(avc_xperms_data_cachep,
- GFP_ATOMIC | __GFP_NOMEMALLOC);
+ GFP_NOWAIT);
if (!xpd->dontaudit)
goto error;
}
@@ -396,8 +395,7 @@ static struct avc_xperms_node *avc_xperms_alloc(void)
{
struct avc_xperms_node *xp_node;
- xp_node = kmem_cache_zalloc(avc_xperms_cachep,
- GFP_ATOMIC|__GFP_NOMEMALLOC);
+ xp_node = kmem_cache_zalloc(avc_xperms_cachep, GFP_NOWAIT);
if (!xp_node)
return xp_node;
INIT_LIST_HEAD(&xp_node->xpd_head);
@@ -550,7 +548,7 @@ static struct avc_node *avc_alloc_node(void)
{
struct avc_node *node;
- node = kmem_cache_zalloc(avc_node_cachep, GFP_ATOMIC|__GFP_NOMEMALLOC);
+ node = kmem_cache_zalloc(avc_node_cachep, GFP_NOWAIT);
if (!node)
goto out;
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