Kernel: Add UID and GID fields to Task

kernel/include/thread/Task.h

@@ -36,6 +36,11 @@ struct Task
 
     int64_t task_time = 0;
 
+    int uid;
+    int euid;
+    int gid;
+    int egid;
+
     Task* next_task = nullptr;
     Task* prev_task = nullptr;
 
@@ -98,6 +103,8 @@ struct Task
 
     Descriptor* descriptor_from_fd(int fd, int& error);
 
+    bool is_superuser();
+
   private:
     void resume_read();
     void resume_wait();

kernel/src/sys/exec.cpp

@@ -45,6 +45,11 @@ void sys_fork(Context* context)
 
     child->ppid = parent->id;
 
+    child->uid = parent->uid;
+    child->euid = parent->euid;
+    child->gid = parent->gid;
+    child->egid = parent->egid;
+
     child->regs.rax = 0;
     context->rax = child->id;
 

kernel/src/sys/id.cpp

@@ -3,6 +3,10 @@
 
 #define ID_PID 0
 #define ID_PPID 1
+#define ID_UID 2
+#define ID_EUID 3
+#define ID_GID 4
+#define ID_EGID 5
 
 void sys_getprocid(Context* context, int field)
 {
@@ -16,6 +20,26 @@ void sys_getprocid(Context* context, int field)
         context->rax = Scheduler::current_task()->ppid;
         return;
     }
+    else if (field == ID_UID)
+    {
+        context->rax = Scheduler::current_task()->uid;
+        return;
+    }
+    else if (field == ID_EUID)
+    {
+        context->rax = Scheduler::current_task()->euid;
+        return;
+    }
+    else if (field == ID_GID)
+    {
+        context->rax = Scheduler::current_task()->gid;
+        return;
+    }
+    else if (field == ID_EGID)
+    {
+        context->rax = Scheduler::current_task()->egid;
+        return;
+    }
     else
     {
         context->rax = -EINVAL;

kernel/src/thread/Task.cpp

@@ -125,4 +125,9 @@ Descriptor* Task::descriptor_from_fd(int fd, int& error)
         return nullptr;
     }
     return &files[fd];
+}
+
+bool Task::is_superuser()
+{
+    return euid == 0;
 }

libs/libc/include/bits/getprocid.h

@@ -3,5 +3,9 @@
 
 #define ID_PID 0
 #define ID_PPID 1
+#define ID_UID 2
+#define ID_EUID 3
+#define ID_GID 4
+#define ID_EGID 5
 
 #endif