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Merge of initial SCM rights code

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This patch, which was originally created by Christian Helmuth,
represents the first step towards using SCM rights as capability
mechanism on Linux. It employs the SCM rights mechanism for transmitting
a reply capability to the server as argument of each IPC call. The
server will then send its respond to this reply file descriptor. This
way, the reply channel does not need to be globally visible anymore.
This commit is contained in:
Norman Feske
2012-07-18 12:34:11 +02:00
parent 76b60566b7
commit c09cd2d1a7
4 changed files with 255 additions and 189 deletions
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48
base-linux/include/base/native_types.h
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@ -64,6 +64,7 @@ namespace Genode {
/**
* Native thread contains more thread-local data than just the ID
*
* FIXME doc
* A thread needs two sockets as it may be a server that depends on another
* service during request processing. If the server socket would be used for
* the client call, the server thread may be unblocked by further requests
@ -73,8 +74,7 @@ namespace Genode {
*/
struct Native_thread : Native_thread_id
{
int client; /* socket used as IPC client */
int server; /* socket used as IPC server */
int socket; /* server-entrypoint socket */
/**
* Opaque pointer to additional thread-specific meta data
@ -85,7 +85,7 @@ namespace Genode {
*/
Thread_meta_data *meta_data;
Native_thread() : client(-1), server(-1), meta_data(0) { }
Native_thread() : socket(-1), meta_data(0) { }
};
inline bool operator == (Native_thread_id t1, Native_thread_id t2) {
@ -107,7 +107,46 @@ namespace Genode {
typedef struct { } Native_utcb;
typedef Native_capability_tpl<Cap_dst_policy> Native_capability;
typedef int Native_connection_state; /* socket descriptor */
class Native_connection_state
{
public:
struct Reply_socket_error { };
private:
int _socket; /* server-entrypoint socket */
int _reply_socket; /* reply socket */
public:
Native_connection_state() : _socket(-1), _reply_socket(-1) { }
void socket(int socket) { _socket = socket; }
int socket() const { return _socket; }
/*
* FIXME Check for unsupported usage pattern: Reply sockets should
* only be set once and read once.
*/
void reply_socket(int socket)
{
if (_reply_socket != -1) throw Reply_socket_error();
_reply_socket = socket;
}
int reply_socket()
{
if (_reply_socket == -1) throw Reply_socket_error();
int s = _reply_socket;
_reply_socket = -1;
return s;
}
};
struct Native_config
{
@ -125,7 +164,6 @@ namespace Genode {
*/
static addr_t context_virtual_size() { return 0x00100000UL; }
};
}
#endif /* _INCLUDE__BASE__NATIVE_TYPES_H_ */