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[kernel] Make capabilities/handles global

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Instead of handles / capabilities having numeric ids that are only valid
for the owning process, they are now global in a system capabilities
table. This will allow for specifying capabilities in IPC that doesn't
need to be kernel-controlled.

Processes will still need to be granted access to given capabilities,
but that can become a simpler system call than the current method of
sending them through mailbox messages (and worse, having to translate
every one into a new capability like was the case before). In order to
track which handles a process has access to, a new node_set based on
node_map allows for an efficient storage and lookup of handles.
This commit is contained in:
Justin C. Miller
2022-10-10 21:19:25 -07:00
parent 41bb97b179
commit 9ac4e51224
27 changed files with 337 additions and 383 deletions
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59
src/kernel/objects/process.cpp
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@@ -1,6 +1,7 @@
#include <util/no_construct.h>
#include "assert.h"
#include "capabilities.h"
#include "cpu.h"
#include "objects/process.h"
#include "objects/thread.h"
@@ -19,17 +20,16 @@ namespace obj {
process::process() :
kobject {kobject::type::process},
m_next_handle {1},
m_state {state::running}
{
m_self_handle = add_handle(this, process::self_caps);
m_self_handle = g_cap_table.create(this, process::self_caps);
add_handle(m_self_handle);
}
// The "kernel process"-only constructor
process::process(page_table *kpml4) :
kobject {kobject::type::process},
m_space {kpml4},
m_next_handle {self_handle()+1},
m_state {state::running}
{
}
@@ -121,51 +121,40 @@ process::thread_exited(thread *th)
return false;
}
j6_handle_t
process::add_handle(kobject *obj, j6_cap_t caps)
void
process::add_handle(j6_handle_t handle)
{
if (!obj)
return j6_handle_invalid;
handle h {m_next_handle++, obj, caps};
j6_handle_t id = h.id;
m_handles.insert(id, h);
return id;
}
j6_handle_t
process::add_handle(const handle &hnd)
{
if (!hnd.object || hnd.id == j6_handle_invalid)
return j6_handle_invalid;
handle h {m_next_handle++, hnd.object, hnd.caps()};
j6_handle_t id = h.id;
m_handles.insert(id, h);
return id;
m_handles.add(handle);
}
bool
process::remove_handle(j6_handle_t id)
{
return m_handles.erase(id);
return m_handles.remove(id);
}
handle *
process::lookup_handle(j6_handle_t id)
bool
process::has_handle(j6_handle_t id)
{
return m_handles.find(id);
return m_handles.contains(id);
}
size_t
process::list_handles(j6_handle_t *handles, size_t len)
process::list_handles(j6_handle_descriptor *handles, size_t len)
{
for (const auto &i : m_handles) {
if (len-- == 0)
break;
*handles++ = i.key;
size_t count = 0;
for (j6_handle_t handle : m_handles) {
capability *cap = g_cap_table.find(handle);
kassert(cap, "Found process handle that wasn't in the cap table");
if (!cap) continue;
j6_handle_descriptor &desc = handles[count];
desc.handle = handle;
desc.caps = cap->caps;
desc.type = static_cast<j6_object_type>(cap->type);
if (++count == len) break;
}
return m_handles.count();