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Skip bulk relabelling of resources in SELinux driver when used with LXC

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The virSecurityManager{Set,Restore}AllLabel methods are invoked
at domain startup/shutdown to relabel resources associated with
a domain. This works fine with QEMU, but with LXC they are in
fact both currently no-ops since LXC does not support disks,
hostdevs, or kernel/initrd files. Worse, when LXC gains support
for disks/hostdevs, they will do the wrong thing, since they
run in host context, not container context. Thus this patch
turns then into a formal no-op when used with LXC. The LXC
controller will call out to specific security manager labelling
APIs as required during startup.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
(cherry picked from commit 89c5a9d0e8)
This commit is contained in:
Daniel P. Berrange 2012-11-28 13:54:39 +00:00 committed by Cole Robinson
parent 8cdeb0f85e
commit 460e481647
1 changed files with 9 additions and 3 deletions
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12
src/security/security_selinux.c
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@ -61,6 +61,7 @@ struct _virSecuritySELinuxData {
char *file_context; char *file_context;
char *content_context; char *content_context;
virHashTablePtr mcs; virHashTablePtr mcs;
bool skipAllLabel;
}; };
struct _virSecuritySELinuxCallbackData { struct _virSecuritySELinuxCallbackData {
@ -363,6 +364,8 @@ virSecuritySELinuxLXCInitialize(virSecurityManagerPtr mgr)
virConfPtr selinux_conf; virConfPtr selinux_conf;
virSecuritySELinuxDataPtr data = virSecurityManagerGetPrivateData(mgr); virSecuritySELinuxDataPtr data = virSecurityManagerGetPrivateData(mgr);
data->skipAllLabel = true;
selinux_conf = virConfReadFile(selinux_lxc_contexts_path(), 0); selinux_conf = virConfReadFile(selinux_lxc_contexts_path(), 0);
if (!selinux_conf) { if (!selinux_conf) {
virReportSystemError(errno, virReportSystemError(errno,
@ -438,6 +441,8 @@ virSecuritySELinuxQEMUInitialize(virSecurityManagerPtr mgr)
char *ptr; char *ptr;
virSecuritySELinuxDataPtr data = virSecurityManagerGetPrivateData(mgr); virSecuritySELinuxDataPtr data = virSecurityManagerGetPrivateData(mgr);
data->skipAllLabel = false;
if (virFileReadAll(selinux_virtual_domain_context_path(), MAX_CONTEXT, &(data->domain_context)) < 0) { if (virFileReadAll(selinux_virtual_domain_context_path(), MAX_CONTEXT, &(data->domain_context)) < 0) {
virReportSystemError(errno, virReportSystemError(errno,
_("cannot read SELinux virtual domain context file '%s'"), _("cannot read SELinux virtual domain context file '%s'"),
@ -1441,11 +1446,12 @@ virSecuritySELinuxRestoreSecuritySmartcardCallback(virDomainDefPtr def,
static int static int
virSecuritySELinuxRestoreSecurityAllLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED, virSecuritySELinuxRestoreSecurityAllLabel(virSecurityManagerPtr mgr,
virDomainDefPtr def, virDomainDefPtr def,
int migrated ATTRIBUTE_UNUSED) int migrated ATTRIBUTE_UNUSED)
{ {
virSecurityLabelDefPtr secdef; virSecurityLabelDefPtr secdef;
virSecuritySELinuxDataPtr data = virSecurityManagerGetPrivateData(mgr);
int i; int i;
int rc = 0; int rc = 0;
@ -1455,7 +1461,7 @@ virSecuritySELinuxRestoreSecurityAllLabel(virSecurityManagerPtr mgr ATTRIBUTE_UN
if (secdef == NULL) if (secdef == NULL)
return -1; return -1;
if (secdef->norelabel) if (secdef->norelabel || data->skipAllLabel)
return 0; return 0;
for (i = 0 ; i < def->nhostdevs ; i++) { for (i = 0 ; i < def->nhostdevs ; i++) {
@ -1813,7 +1819,7 @@ virSecuritySELinuxSetSecurityAllLabel(virSecurityManagerPtr mgr,
if (secdef == NULL) if (secdef == NULL)
return -1; return -1;
if (secdef->norelabel) if (secdef->norelabel || data->skipAllLabel)
return 0; return 0;
for (i = 0 ; i < def->ndisks ; i++) { for (i = 0 ; i < def->ndisks ; i++) {