[PATCH] pid: Fix mips irix emulation pid usage

[ebiederm@xmission.com (Eric W. Biederman)]

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
 arch/mips/kernel/irixelf.c |   14 +++++++-------
 arch/mips/kernel/irixsig.c |   16 ++++++++++------
 arch/mips/kernel/sysirix.c |   12 ++++++------
 3 files changed, 23 insertions(+), 19 deletions(-)

diff --git a/arch/mips/kernel/irixelf.c b/arch/mips/kernel/irixelf.c
index 7852c7c..290d8e3 100644
--- a/arch/mips/kernel/irixelf.c
+++ b/arch/mips/kernel/irixelf.c
@@ -591,9 +591,9 @@ static void irix_map_prda_page(void)
 		return;
 
 	pp = (struct prda *) v;
-	pp->prda_sys.t_pid  = current->pid;
+	pp->prda_sys.t_pid  = task_pid_vnr(current);
 	pp->prda_sys.t_prid = read_c0_prid();
-	pp->prda_sys.t_rpid = current->pid;
+	pp->prda_sys.t_rpid = task_pid_vnr(current);
 
 	/* We leave the rest set to zero */
 }
@@ -1170,11 +1170,11 @@ static int irix_core_dump(long signr, struct pt_regs *regs, struct file *file, u
 	prstatus.pr_info.si_signo = prstatus.pr_cursig = signr;
 	prstatus.pr_sigpend = current->pending.signal.sig[0];
 	prstatus.pr_sighold = current->blocked.sig[0];
-	psinfo.pr_pid = prstatus.pr_pid = current->pid;
-	psinfo.pr_ppid = prstatus.pr_ppid = current->parent->pid;
-	psinfo.pr_pgrp = prstatus.pr_pgrp = task_pgrp_nr(current);
-	psinfo.pr_sid = prstatus.pr_sid = task_session_nr(current);
-	if (current->pid == current->tgid) {
+	psinfo.pr_pid = prstatus.pr_pid = task_pid_vnr(current);
+	psinfo.pr_ppid = prstatus.pr_ppid = task_pid_vnr(current->parent);
+	psinfo.pr_pgrp = prstatus.pr_pgrp = task_pgrp_vnr(current);
+	psinfo.pr_sid = prstatus.pr_sid = task_session_vnr(current);
+	if (thread_group_leader(current)) {
 		/*
 		 * This is the record for the group leader.  Add in the
 		 * cumulative times of previous dead threads.  This total
diff --git a/arch/mips/kernel/irixsig.c b/arch/mips/kernel/irixsig.c
index 5b10ac1..0215c80 100644
--- a/arch/mips/kernel/irixsig.c
+++ b/arch/mips/kernel/irixsig.c
@@ -578,10 +578,11 @@ out:
 
 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 
-asmlinkage int irix_waitsys(int type, int pid,
+asmlinkage int irix_waitsys(int type, int upid,
 	struct irix5_siginfo __user *info, int options,
 	struct rusage __user *ru)
 {
+	struct pid *pid = NULL;
 	int flag, retval;
 	DECLARE_WAITQUEUE(wait, current);
 	struct task_struct *tsk;
@@ -604,6 +605,8 @@ asmlinkage int irix_waitsys(int type, int pid,
 	if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
 		return -EINVAL;
 
+	if (type != IRIX_P_ALL)
+		pid = find_get_pid(upid);
 	add_wait_queue(&current->signal->wait_chldexit, &wait);
 repeat:
 	flag = 0;
@@ -612,9 +615,9 @@ repeat:
 	tsk = current;
 	list_for_each(_p, &tsk->children) {
 		p = list_entry(_p, struct task_struct, sibling);
-		if ((type == IRIX_P_PID) && p->pid != pid)
+		if ((type == IRIX_P_PID) && task_pid(p) != pid)
 			continue;
-		if ((type == IRIX_P_PGID) && task_pgrp_nr(p) != pid)
+		if ((type == IRIX_P_PGID) && task_pgrp(p) != pid)
 			continue;
 		if ((p->exit_signal != SIGCHLD))
 			continue;
@@ -639,7 +642,7 @@ repeat:
 
 			retval = __put_user(SIGCHLD, &info->sig);
 			retval |= __put_user(0, &info->code);
-			retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
+			retval |= __put_user(task_pid_vnr(p), &info->stuff.procinfo.pid);
 			retval |= __put_user((p->exit_code >> 8) & 0xff,
 			           &info->stuff.procinfo.procdata.child.status);
 			retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
@@ -657,7 +660,7 @@ repeat:
 				getrusage(p, RUSAGE_BOTH, ru);
 			retval = __put_user(SIGCHLD, &info->sig);
 			retval |= __put_user(1, &info->code);      /* CLD_EXITED */
-			retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
+			retval |= __put_user(task_pid_vnr(p), &info->stuff.procinfo.pid);
 			retval |= __put_user((p->exit_code >> 8) & 0xff,
 			           &info->stuff.procinfo.procdata.child.status);
 			retval |= __put_user(p->utime,
@@ -665,7 +668,7 @@ repeat:
 			retval |= __put_user(p->stime,
 			           &info->stuff.procinfo.procdata.child.stime);
 			if (retval)
-				return retval;
+				goto end_waitsys;
 
 			if (p->real_parent != p->parent) {
 				write_lock_irq(&tasklist_lock);
@@ -698,6 +701,7 @@ repeat:
 end_waitsys:
 	current->state = TASK_RUNNING;
 	remove_wait_queue(&current->signal->wait_chldexit, &wait);
+	put_pid(pid);
 
 	return retval;
 }
diff --git a/arch/mips/kernel/sysirix.c b/arch/mips/kernel/sysirix.c
index 6f5446b..13f0f96 100644
--- a/arch/mips/kernel/sysirix.c
+++ b/arch/mips/kernel/sysirix.c
@@ -582,8 +582,8 @@ out:
 
 asmlinkage int irix_getpid(struct pt_regs *regs)
 {
-	regs->regs[3] = current->real_parent->pid;
-	return current->pid;
+	regs->regs[3] = task_pid_vnr(current->real_parent);
+	return task_pid_vnr(current);
 }
 
 asmlinkage int irix_getuid(struct pt_regs *regs)
@@ -763,11 +763,11 @@ asmlinkage int irix_setpgrp(int flags)
 	printk("[%s:%d] setpgrp(%d) ", current->comm, current->pid, flags);
 #endif
 	if(!flags)
-		error = task_pgrp_nr(current);
+		error = task_pgrp_vnr(current);
 	else
 		error = sys_setsid();
 #ifdef DEBUG_PROCGRPS
-	printk("returning %d\n", task_pgrp_nr(current));
+	printk("returning %d\n", error);
 #endif
 
 	return error;
@@ -1093,10 +1093,10 @@ asmlinkage int irix_BSDsetpgrp(int pid, int pgrp)
 	       pid, pgrp);
 #endif
 	if(!pid)
-		pid = current->pid;
+		pid = task_pid_vnr(current);
 
 	/* Wheee, weird sysv thing... */
-	if ((pgrp == 0) && (pid == current->pid))
+	if ((pgrp == 0) && (pid == task_pid_vnr(current))
 		error = sys_setsid();
 	else
 		error = sys_setpgid(pid, pgrp);
-- 
1.5.3.rc6.17.g1911