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device_cgroup: rename deny_all to behavior 

This was done in a v2 patch but v1 ended up being committed.  The
variable name is less confusing and stores the default behavior when no
matching exception exists.

Signed-off-by: Aristeu Rozanski <aris@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: James Morris <jmorris@namei.org>
Cc: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aristeu Rozanski 2012-10-25 13:37:38 -07:00 committed by Linus Torvalds
parent 8c9506d169
commit 5b7aa7d5bb
1 changed files with 14 additions and 11 deletions
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25
security/device_cgroup.c
View File

@ -42,7 +42,10 @@ struct dev_exception_item {
struct dev_cgroup {
struct cgroup_subsys_state css;
struct list_head exceptions;
bool deny_all;
enum {
DEVCG_DEFAULT_ALLOW,
DEVCG_DEFAULT_DENY,
} behavior;
};
static inline struct dev_cgroup *css_to_devcgroup(struct cgroup_subsys_state *s)
@ -182,13 +185,13 @@ static struct cgroup_subsys_state *devcgroup_create(struct cgroup *cgroup)
parent_cgroup = cgroup->parent;
if (parent_cgroup == NULL)
dev_cgroup->deny_all = false;
dev_cgroup->behavior = DEVCG_DEFAULT_ALLOW;
else {
parent_dev_cgroup = cgroup_to_devcgroup(parent_cgroup);
mutex_lock(&devcgroup_mutex);
ret = dev_exceptions_copy(&dev_cgroup->exceptions,
&parent_dev_cgroup->exceptions);
dev_cgroup->deny_all = parent_dev_cgroup->deny_all;
dev_cgroup->behavior = parent_dev_cgroup->behavior;
mutex_unlock(&devcgroup_mutex);
if (ret) {
kfree(dev_cgroup);
@ -260,7 +263,7 @@ static int devcgroup_seq_read(struct cgroup *cgroup, struct cftype *cft,
* - List the exceptions in case the default policy is to deny
* This way, the file remains as a "whitelist of devices"
*/
if (devcgroup->deny_all == false) {
if (devcgroup->behavior == DEVCG_DEFAULT_ALLOW) {
set_access(acc, ACC_MASK);
set_majmin(maj, ~0);
set_majmin(min, ~0);
@ -314,12 +317,12 @@ static int may_access(struct dev_cgroup *dev_cgroup,
* In two cases we'll consider this new exception valid:
* - the dev cgroup has its default policy to allow + exception list:
* the new exception should *not* match any of the exceptions
* (!deny_all, !match)
* (behavior == DEVCG_DEFAULT_ALLOW, !match)
* - the dev cgroup has its default policy to deny + exception list:
* the new exception *should* match the exceptions
* (deny_all, match)
* (behavior == DEVCG_DEFAULT_DENY, match)
*/
if (dev_cgroup->deny_all == match)
if ((dev_cgroup->behavior == DEVCG_DEFAULT_DENY) == match)
return 1;
return 0;
}
@ -375,11 +378,11 @@ static int devcgroup_update_access(struct dev_cgroup *devcgroup,
if (!parent_has_perm(devcgroup, &ex))
return -EPERM;
dev_exception_clean(devcgroup);
devcgroup->deny_all = false;
devcgroup->behavior = DEVCG_DEFAULT_ALLOW;
break;
case DEVCG_DENY:
dev_exception_clean(devcgroup);
devcgroup->deny_all = true;
devcgroup->behavior = DEVCG_DEFAULT_DENY;
break;
default:
return -EINVAL;
@ -452,7 +455,7 @@ static int devcgroup_update_access(struct dev_cgroup *devcgroup,
* an matching exception instead. And be silent about it: we
* don't want to break compatibility
*/
if (devcgroup->deny_all == false) {
if (devcgroup->behavior == DEVCG_DEFAULT_ALLOW) {
dev_exception_rm(devcgroup, &ex);
return 0;
}
@ -463,7 +466,7 @@ static int devcgroup_update_access(struct dev_cgroup *devcgroup,
* an matching exception instead. And be silent about it: we
* don't want to break compatibility
*/
if (devcgroup->deny_all == true) {
if (devcgroup->behavior == DEVCG_DEFAULT_DENY) {
dev_exception_rm(devcgroup, &ex);
return 0;
}