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Lots of fixes, notion of pager hierarchy, fixed tgroup capability checking

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Notion of pager hierarchy introduced using the existing but unused
pagerid field.

Thread creation now has two more flags TC_AS_PAGER and TC_SHARE_PAGER.
The former sets creator as pager, the latter sets creator's pager as pager.

Thread group capability sharing now correctly carries shared capabilities
to the thread group leader's tgr_cap_list list, and this list is checked
during capability checking.
This commit is contained in:
Bahadir Balban
2009-10-23 02:36:12 +03:00
parent df776b568f
commit 89d49ef495
8 changed files with 44 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/api/capability.c
View File

@@ -68,7 +68,7 @@ int capability_share(unsigned int share_flags)
struct ktcb *tgr_leader;
BUG_ON(!(tgr_leader = tcb_find(current->tgid)));
cap_list_move(&tgr_leader->cap_list,
cap_list_move(&tgr_leader->tgr_cap_list,
&current->cap_list);
break;
}

38
src/api/thread.c
View File

@@ -191,7 +191,8 @@ void task_destroy_current(void)
list_foreach_removable_struct(task, n,
&curcont->ktcb_list.list,
task_list) {
if (task->tid == current->tid)
if (task->tid == current->tid ||
task->pagerid != current->tid)
continue;
spin_unlock(&curcont->ktcb_list.list_lock);
task_suspend(task, TASK_EXITING);
@@ -342,7 +343,7 @@ out:
int thread_create(struct task_ids *ids, unsigned int flags)
{
struct ktcb *new;
struct ktcb *parent = 0;
struct ktcb *orig = 0;
int err;
/* Clear flags to just include creation flags */
@@ -353,6 +354,10 @@ int thread_create(struct task_ids *ids, unsigned int flags)
& TC_COPY_SPACE & TC_NEW_SPACE) || !flags)
return -EINVAL;
/* Can't have multiple pager specifiers */
if (flags & TC_SHARE_PAGER & TC_AS_PAGER)
return -EINVAL;
/* Can't request shared utcb or tgid without shared space */
if (!(flags & TC_SHARE_SPACE)) {
if ((flags & TC_SHARE_UTCB) ||
@@ -370,28 +375,41 @@ int thread_create(struct task_ids *ids, unsigned int flags)
/* Obtain parent thread if there is one */
if (flags & TC_SHARE_SPACE || flags & TC_COPY_SPACE) {
if (!(parent = tcb_find(ids->tid))) {
if (!(orig = tcb_find(ids->tid))) {
err = -EINVAL;
goto out_err;
}
}
/*
* Setup container-generic fields from current task
* Note this is a kernel-level relationship
* between the creator and the new thread.
*
* NOTE: If a new container is created, this needs
* to assign the new pager and container
* Any higher layer may define parent/child
* relationships between orig and new separately.
*/
if (flags & TC_AS_PAGER)
new->pagerid = current->tid;
else if (flags & TC_SHARE_PAGER)
new->pagerid = current->pagerid;
else
new->pagerid = new->tid;
/*
* Setup container-generic fields from current task
*/
new->pagerid = current->pagerid;
new->pager = current->pager;
new->container = current->container;
/* Set up new thread context by using parent ids and flags */
thread_setup_new_ids(ids, flags, new, parent);
arch_setup_new_thread(new, parent, flags);
thread_setup_new_ids(ids, flags, new, orig);
arch_setup_new_thread(new, orig, flags);
tcb_add(new);
//printk("%s: %d created: %d, %d, %d \n",
// __FUNCTION__, current->tid, ids->tid,
// ids->tgid, ids->spid);
return 0;
out_err: