Hi,
I have been having some trouble with the Region Map interface not setting the
correct permissions in my specified memory region. I am trying to replicate a
similar functionality to rm_nested:
```cpp
const addr_t OBJECT_SPACE_START = 0x80000000;
const addr_t OBJECT_SPACE_SIZE = 0x40000000;
Genode::Env &_env;
Genode::Rm_connection _rm{_env};
// To be attached to env's rm
Genode::Region_map_client _obj_space{_rm.create(OBJECT_SPACE_SIZE)};
...
Region_map::Attr attributes{.size = OBJECT_SPACE_SIZE,
.offset = 0,
.use_at = true,
.at = OBJECT_SPACE_START,
.executable = true,
.writeable = true};
addr_t ptr_obj = 0;
env.rm()
.attach(_obj_space.dataspace(), attributes)
.with_result(
[&ptr_obj](Genode::Env::Local_rm::Attachment &attachment) {
ptr_obj = (Genode::addr_t)attachment.ptr;
attachment.deallocate = false;
},
[](auto) {
error("couldn't attach dataspace!");
throw;
});
```
I expect this code snippet to make the region at 0x80000000 to be rwx, however
when I run my program with GDB I see that the permissions are ---p:
(gdb) info proc mappings
Mapped address spaces:
Start Addr End Addr Size Offset
Perms objfile
0x80000000 0xc0000000 0x40000000 0x0 ---p
I have also tried adding a dataspace capability to _obj_space ( before
attaching it to env.rm() ) but that had no effect on the permissions:
```cpp
_obj_space.attach(env.ram().alloc(OBJECT_SPACE_SIZE), attributes);
```
Any help / suggestions would be greatly appreciated as I have been stuck on
this for quite a while!
Best,
Rumen
P.S. The permissions are set correctly when I do:
```cpp
addr_t ptr_obj = 0;
env.rm()
.attach(env.ram().alloc(OBJECT_SPACE_SIZE), attributes)
.with_result(
[&ptr_obj](Genode::Env::Local_rm::Attachment &attachment) {
ptr_obj = (Genode::addr_t)attachment.ptr;
attachment.deallocate = false;
},
[](auto) {
error("couldn't attach dataspace!");
throw;
});
```
The problem with this is that later on in my program I get an error as I need
the _obj_space region map client.
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