The patch titled
devscgroup: make white list more compact in some cases
has been added to the -mm tree. Its filename is
devscgroup-make-white-list-more-compact-in-some-cases.patch
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------------------------------------------------------
Subject: devscgroup: make white list more compact in some cases
From: Pavel Emelyanov <xemul@xxxxxxxxxx>
Consider you added a 'c foo:bar r' permission to some cgroup and then (a
bit later) 'c'foo:bar w' for it. After this you'll see the
c foo:bar r
c foo:bar w
lines in a devices.list file.
Another example - consider you added 10 'c foo:bar r' permissions to some
cgroup (e.g. by mistake). After this you'll see 10 c foo:bar r lines in
a list file.
This is weird. This situation also has one more annoying consequence.
Having many items in a white list makes permissions checking slower, sine
it has to walk a longer list.
The proposal is to merge permissions for items, that correspond to the
same device.
Signed-off-by: Pavel Emelyanov <xemul@xxxxxxxxxx>
Acked-by: Serge Hallyn <serue@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
security/device_cgroup.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff -puN security/device_cgroup.c~devscgroup-make-white-list-more-compact-in-some-cases security/device_cgroup.c
--- a/security/device_cgroup.c~devscgroup-make-white-list-more-compact-in-some-cases
+++ a/security/device_cgroup.c
@@ -106,7 +106,7 @@ free_and_exit:
static int dev_whitelist_add(struct dev_cgroup *dev_cgroup,
struct dev_whitelist_item *wh)
{
- struct dev_whitelist_item *whcopy;
+ struct dev_whitelist_item *whcopy, *walk;
whcopy = kmalloc(sizeof(*whcopy), GFP_KERNEL);
if (!whcopy)
@@ -114,7 +114,21 @@ static int dev_whitelist_add(struct dev_
memcpy(whcopy, wh, sizeof(*whcopy));
spin_lock(&dev_cgroup->lock);
- list_add_tail(&whcopy->list, &dev_cgroup->whitelist);
+ list_for_each_entry(walk, &dev_cgroup->whitelist, list) {
+ if (walk->type != wh->type)
+ continue;
+ if (walk->major != wh->major)
+ continue;
+ if (walk->minor != wh->minor)
+ continue;
+
+ walk->access |= wh->access;
+ kfree(whcopy);
+ whcopy = NULL;
+ }
+
+ if (whcopy != NULL)
+ list_add_tail(&whcopy->list, &dev_cgroup->whitelist);
spin_unlock(&dev_cgroup->lock);
return 0;
}
_
Patches currently in -mm which might be from xemul@xxxxxxxxxx are
devcgroup-make-a-helper-to-convert-cgroup_subsys_state-to-devs_cgroup.patch
devscgroup-relax-task-to-dev_cgroup-conversion.patch
devscgroup-check-for-device-permissions-at-mount-time.patch
devscgroup-make-white-list-more-compact-in-some-cases.patch
linux-next.patch
proc-calculate-the-correct-proc-pid-link-count.patch
proc-calculate-the-correct-proc-pid-link-count-cleanup.patch
mark-res_counter_charge_locked-with-__must_check.patch
memcg-make-global-var-read_mostly.patch
memcg-avoid-unnecessary-initialization.patch
memcg-better-migration-handling.patch
memcg-remove-refcnt-from-page_cgroup.patch
memcg-remove-refcnt-from-page_cgroup-fix.patch
memcg-handle-swap-cache.patch
memcg-helper-function-for-relcaim-from-shmem.patch
memcg-add-hints-for-branch.patch
memcg-remove-a-redundant-check.patch
memrlimit-add-memrlimit-controller-documentation.patch
memrlimit-setup-the-memrlimit-controller.patch
memrlimit-cgroup-mm-owner-callback-changes-to-add-task-info.patch
memrlimit-add-memrlimit-controller-accounting-and-control.patch
sysctl-allow-override-of-proc-sys-net-with-cap_net_admin.patch
bsdacct-rename-acct_blbls-to-bsd_acct_struct.patch
pidns-use-kzalloc-when-allocating-new-pid_namespace-struct.patch
pidns-add-the-struct-bsd_acct_struct-pointer-on-pid_namespace-struct.patch
bsdacct-truthify-a-comment-near-acct_process.patch
bsdacct-make-check-timer-accept-a-bsd_acct_struct-argument.patch
bsdacct-turn-the-acct_lock-from-on-the-struct-to-global.patch
bsdacct-make-internal-code-work-with-passed-bsd_acct_struct-not-global.patch
bsdacct-switch-from-global-bsd_acct_struct-instance-to-per-pidns-one.patch
bsdacct-turn-acct-off-for-all-pidns-s-on-umount-time.patch
bsdacct-account-dying-tasks-in-all-relevant-namespaces.patch
bsdacct-stir-up-comments-around-acct_process.patch
reiser4.patch
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