1 // Copyright 2016 The Fuchsia Authors
2 //
3 // Use of this source code is governed by a MIT-style
4 // license that can be found in the LICENSE file or at
5 // https://opensource.org/licenses/MIT
6
7 #include <err.h>
8 #include <inttypes.h>
9 #include <trace.h>
10
11 #include <object/handle.h>
12 #include <object/process_dispatcher.h>
13
14 #include "priv.h"
15
16 #define LOCAL_TRACE 0
17
18 // zx_status_t zx_handle_close
sys_handle_close(zx_handle_t handle_value)19 zx_status_t sys_handle_close(zx_handle_t handle_value) {
20 LTRACEF("handle %x\n", handle_value);
21
22 // Closing the "never a handle" invalid handle is not an error
23 // It's like free(NULL).
24 if (handle_value == ZX_HANDLE_INVALID)
25 return ZX_OK;
26 auto up = ProcessDispatcher::GetCurrent();
27 HandleOwner handle(up->RemoveHandle(handle_value));
28 if (!handle)
29 return ZX_ERR_BAD_HANDLE;
30 return ZX_OK;
31 }
32
33 // zx_status_t zx_handle_close_many
sys_handle_close_many(user_in_ptr<const zx_handle_t> handles,size_t num_handles)34 zx_status_t sys_handle_close_many(user_in_ptr<const zx_handle_t> handles, size_t num_handles) {
35 LTRACEF("handles %p, num_handles %zu\n", handles.get(), num_handles);
36
37 auto up = ProcessDispatcher::GetCurrent();
38 return up->RemoveHandles(handles, num_handles);
39 }
40
handle_dup_replace(bool is_replace,zx_handle_t handle_value,zx_rights_t rights,user_out_handle * out)41 static zx_status_t handle_dup_replace(
42 bool is_replace, zx_handle_t handle_value, zx_rights_t rights,
43 user_out_handle* out) {
44 LTRACEF("handle %x\n", handle_value);
45
46 auto up = ProcessDispatcher::GetCurrent();
47
48 Guard<fbl::Mutex> guard{up->handle_table_lock()};
49 auto source = up->GetHandleLocked(handle_value);
50 if (!source)
51 return ZX_ERR_BAD_HANDLE;
52
53 if (!is_replace) {
54 if (!source->HasRights(ZX_RIGHT_DUPLICATE))
55 return ZX_ERR_ACCESS_DENIED;
56 }
57
58 if (rights == ZX_RIGHT_SAME_RIGHTS) {
59 rights = source->rights();
60 } else if ((source->rights() & rights) != rights) {
61 if (is_replace)
62 up->RemoveHandleLocked(handle_value);
63 return ZX_ERR_INVALID_ARGS;
64 }
65
66 zx_status_t status = out->dup(source, rights);
67
68 if (is_replace)
69 up->RemoveHandleLocked(handle_value);
70
71 return status;
72 }
73
74 // zx_status_t zx_handle_duplicate
sys_handle_duplicate(zx_handle_t handle_value,zx_rights_t rights,user_out_handle * out)75 zx_status_t sys_handle_duplicate(
76 zx_handle_t handle_value, zx_rights_t rights, user_out_handle* out) {
77 return handle_dup_replace(false, handle_value, rights, out);
78 }
79
80 // zx_status_t zx_handle_replace
sys_handle_replace(zx_handle_t handle_value,zx_rights_t rights,user_out_handle * out)81 zx_status_t sys_handle_replace(
82 zx_handle_t handle_value, zx_rights_t rights, user_out_handle* out) {
83 return handle_dup_replace(true, handle_value, rights, out);
84 }
85