From: Matthias Kruk <m@m10k.eu>
Date: Wed, 6 Nov 2019 06:51:42 +0000 (+0900)
Subject: Implement process ownership and inheritance
X-Git-Url: https://git.corax.cc/?a=commitdiff_plain;h=e207c7cfe2f7ce9d798d4def191c3a3a426f4542;p=corax

Implement process ownership and inheritance
---

diff --git a/kernel/core/process.c b/kernel/core/process.c
index 58890c3..710fc75 100644
--- a/kernel/core/process.c
+++ b/kernel/core/process.c
@@ -22,6 +22,8 @@ struct process {
 	u32_t          p_privl;
 	pid_t          p_id;
 	pid_t          p_pid;
+	uid_t          p_uid;
+	gid_t          p_gid;
 
 	struct {
 		struct cxmsg *msg;
@@ -161,11 +163,9 @@ int process_create(process_t **dst, pid_t pid, u32_t ppl, void *entry)
 {
 	int ret_val;
 	process_t *proc;
-	pid_t ppid;
 
 	ret_val = -ENOMEM;
 	proc = NULL;
-	ppid = 1;
 
 	/* was a specific pid requested? */
 	if(pid != PID_ANY) {
@@ -190,12 +190,12 @@ int process_create(process_t **dst, pid_t pid, u32_t ppl, void *entry)
 		/* inherit the ppl from the current task, in the case of fork and vfork */
 		ctask = task_get_current();
 		ppl = ctask->t_privl;
-		ppid = ctask->t_pid;
 	}
 
 	proc = kmalloc(sizeof(*proc));
 
 	if(proc) {
+		process_t *cproc;
 		void *pdbr;
 		void *kstack;
 		void *ustack;
@@ -217,11 +217,36 @@ int process_create(process_t **dst, pid_t pid, u32_t ppl, void *entry)
 			goto cleanup;
 		}
 
+		cproc = process_get_current();
+
+		if(cproc) {
+			/* inherit uid and gid from the current process */
+			proc->p_uid = cproc->p_uid;
+			proc->p_gid = cproc->p_gid;
+
+			/* set the ppid */
+			proc->p_pid = cproc->p_id;
+
+			/* also inherit the scheduling settings */
+			proc->p_tasks->t_tslice = cproc->p_tasks->t_tslice;
+			proc->p_tasks->t_rslice = proc->p_tasks->t_tslice;
+		} else {
+			/*
+			 * This only happens when process_create() is called before the
+			 * scheduler is invoked for the first time.
+			 */
+			proc->p_uid = 0;
+			proc->p_gid = 0;
+			proc->p_pid = 0;
+
+			proc->p_tasks->t_tslice = 50;
+			proc->p_tasks->t_rslice = 50;
+		}
+
 		/* set the default signal handlers */
 		memcpy(proc->p_sighandler, _sig_dfl, sizeof(proc->p_sighandler));
 
 		proc->p_privl = ppl;
-		proc->p_pid = ppid;
 
 		if(pid == PID_ANY) {
 			/* no specific pid requested */
@@ -231,8 +256,6 @@ int process_create(process_t **dst, pid_t pid, u32_t ppl, void *entry)
 		}
 
 		proc->p_tasks->t_kstack = kstack;
-		proc->p_tasks->t_tslice = 50;
-		proc->p_tasks->t_rslice = 50;
 		proc->p_tasks->t_proc = proc;
 		proc->p_tasks->t_pid = proc->p_id;