[PATCH] add process_session() helper routine
Replace occurences of task->signal->session by a new process_session() helper
routine.
It will be useful for pid namespaces to abstract the session pid number.
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/mips/kernel/irixelf.c b/arch/mips/kernel/irixelf.c
index 1bbefbf..37cad5d 100644
--- a/arch/mips/kernel/irixelf.c
+++ b/arch/mips/kernel/irixelf.c
@@ -1145,7 +1145,7 @@
psinfo.pr_pid = prstatus.pr_pid = current->pid;
psinfo.pr_ppid = prstatus.pr_ppid = current->parent->pid;
psinfo.pr_pgrp = prstatus.pr_pgrp = process_group(current);
- psinfo.pr_sid = prstatus.pr_sid = current->signal->session;
+ psinfo.pr_sid = prstatus.pr_sid = process_session(current);
if (current->pid == current->tgid) {
/*
* This is the record for the group leader. Add in the
diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index 5ed2486..b1cc89c 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -994,7 +994,7 @@
mxser_change_speed(info, NULL);
}
- info->session = current->signal->session;
+ info->session = process_session(current);
info->pgrp = process_group(current);
/*
diff --git a/drivers/char/rocket.c b/drivers/char/rocket.c
index bac8005..4fdf52e 100644
--- a/drivers/char/rocket.c
+++ b/drivers/char/rocket.c
@@ -1017,7 +1017,7 @@
/*
* Info->count is now 1; so it's safe to sleep now.
*/
- info->session = current->signal->session;
+ info->session = process_session(current);
info->pgrp = process_group(current);
if ((info->flags & ROCKET_INITIALIZED) == 0) {
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 8a2d26e..4ebba7c 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1511,7 +1511,7 @@
spin_lock_irq(¤t->sighand->siglock);
current->signal->tty_old_pgrp = 0;
- session = current->signal->session;
+ session = process_session(current);
spin_unlock_irq(¤t->sighand->siglock);
mutex_lock(&tty_mutex);
@@ -2897,7 +2897,7 @@
{
int ret = 0;
if (current->signal->leader &&
- (current->signal->session == tty->session))
+ (process_session(current) == tty->session))
return ret;
mutex_lock(&tty_mutex);
@@ -2979,13 +2979,13 @@
return retval;
if (!current->signal->tty ||
(current->signal->tty != real_tty) ||
- (real_tty->session != current->signal->session))
+ (real_tty->session != process_session(current)))
return -ENOTTY;
if (get_user(pgrp, p))
return -EFAULT;
if (pgrp < 0)
return -EINVAL;
- if (session_of_pgrp(pgrp) != current->signal->session)
+ if (session_of_pgrp(pgrp) != process_session(current))
return -EPERM;
real_tty->pgrp = pgrp;
return 0;
@@ -3338,7 +3338,7 @@
/* Kill the entire session */
do_each_task_pid(session, PIDTYPE_SID, p) {
printk(KERN_NOTICE "SAK: killed process %d"
- " (%s): p->signal->session==tty->session\n",
+ " (%s): process_session(p)==tty->session\n",
p->pid, p->comm);
send_sig(SIGKILL, p, 1);
} while_each_task_pid(session, PIDTYPE_SID, p);
@@ -3348,7 +3348,7 @@
do_each_thread(g, p) {
if (p->signal->tty == tty) {
printk(KERN_NOTICE "SAK: killed process %d"
- " (%s): p->signal->session==tty->session\n",
+ " (%s): process_session(p)==tty->session\n",
p->pid, p->comm);
send_sig(SIGKILL, p, 1);
continue;
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index c6dbb4a..d3adfd3 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1317,7 +1317,7 @@
prstatus->pr_pid = p->pid;
prstatus->pr_ppid = p->parent->pid;
prstatus->pr_pgrp = process_group(p);
- prstatus->pr_sid = p->signal->session;
+ prstatus->pr_sid = process_session(p);
if (thread_group_leader(p)) {
/*
* This is the record for the group leader. Add in the
@@ -1363,7 +1363,7 @@
psinfo->pr_pid = p->pid;
psinfo->pr_ppid = p->parent->pid;
psinfo->pr_pgrp = process_group(p);
- psinfo->pr_sid = p->signal->session;
+ psinfo->pr_sid = process_session(p);
i = p->state ? ffz(~p->state) + 1 : 0;
psinfo->pr_state = i;
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 9f0b7ef..76f06f6 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1322,7 +1322,7 @@
prstatus->pr_pid = p->pid;
prstatus->pr_ppid = p->parent->pid;
prstatus->pr_pgrp = process_group(p);
- prstatus->pr_sid = p->signal->session;
+ prstatus->pr_sid = process_session(p);
if (thread_group_leader(p)) {
/*
* This is the record for the group leader. Add in the
@@ -1371,7 +1371,7 @@
psinfo->pr_pid = p->pid;
psinfo->pr_ppid = p->parent->pid;
psinfo->pr_pgrp = process_group(p);
- psinfo->pr_sid = p->signal->session;
+ psinfo->pr_sid = process_session(p);
i = p->state ? ffz(~p->state) + 1 : 0;
psinfo->pr_state = i;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5e8a0ba..270d864 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1047,6 +1047,11 @@
return tsk->signal->pgrp;
}
+static inline pid_t process_session(struct task_struct *tsk)
+{
+ return tsk->signal->session;
+}
+
static inline struct pid *task_pid(struct task_struct *task)
{
return task->pids[PIDTYPE_PID].pid;
diff --git a/kernel/exit.c b/kernel/exit.c
index fa0495e..8d289bf 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -193,14 +193,14 @@
read_lock(&tasklist_lock);
do_each_task_pid(pgrp, PIDTYPE_PGID, p) {
- if (p->signal->session > 0) {
- sid = p->signal->session;
+ if (process_session(p) > 0) {
+ sid = process_session(p);
goto out;
}
} while_each_task_pid(pgrp, PIDTYPE_PGID, p);
p = find_task_by_pid(pgrp);
if (p)
- sid = p->signal->session;
+ sid = process_session(p);
out:
read_unlock(&tasklist_lock);
@@ -225,8 +225,8 @@
|| p->exit_state
|| is_init(p->real_parent))
continue;
- if (process_group(p->real_parent) != pgrp
- && p->real_parent->signal->session == p->signal->session) {
+ if (process_group(p->real_parent) != pgrp &&
+ process_session(p->real_parent) == process_session(p)) {
ret = 0;
break;
}
@@ -302,7 +302,7 @@
{
struct task_struct *curr = current->group_leader;
- if (curr->signal->session != session) {
+ if (process_session(curr) != session) {
detach_pid(curr, PIDTYPE_SID);
curr->signal->session = session;
attach_pid(curr, PIDTYPE_SID, session);
@@ -647,10 +647,11 @@
* outside, so the child pgrp is now orphaned.
*/
if ((process_group(p) != process_group(father)) &&
- (p->signal->session == father->signal->session)) {
+ (process_session(p) == process_session(father))) {
int pgrp = process_group(p);
- if (will_become_orphaned_pgrp(pgrp, NULL) && has_stopped_jobs(pgrp)) {
+ if (will_become_orphaned_pgrp(pgrp, NULL) &&
+ has_stopped_jobs(pgrp)) {
__kill_pg_info(SIGHUP, SEND_SIG_PRIV, pgrp);
__kill_pg_info(SIGCONT, SEND_SIG_PRIV, pgrp);
}
@@ -784,7 +785,7 @@
t = tsk->real_parent;
if ((process_group(t) != process_group(tsk)) &&
- (t->signal->session == tsk->signal->session) &&
+ (process_session(t) == process_session(tsk)) &&
will_become_orphaned_pgrp(process_group(tsk), tsk) &&
has_stopped_jobs(process_group(tsk))) {
__kill_pg_info(SIGHUP, SEND_SIG_PRIV, process_group(tsk));
diff --git a/kernel/fork.c b/kernel/fork.c
index 5977078..298c4d6 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1259,9 +1259,9 @@
if (thread_group_leader(p)) {
p->signal->tty = current->signal->tty;
p->signal->pgrp = process_group(current);
- p->signal->session = current->signal->session;
+ p->signal->session = process_session(current);
attach_pid(p, PIDTYPE_PGID, process_group(p));
- attach_pid(p, PIDTYPE_SID, p->signal->session);
+ attach_pid(p, PIDTYPE_SID, process_session(p));
list_add_tail_rcu(&p->tasks, &init_task.tasks);
__get_cpu_var(process_counts)++;
diff --git a/kernel/signal.c b/kernel/signal.c
index ec81def..9eac4db 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -583,7 +583,7 @@
error = -EPERM;
if ((info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info)))
&& ((sig != SIGCONT) ||
- (current->signal->session != t->signal->session))
+ (process_session(current) != process_session(t)))
&& (current->euid ^ t->suid) && (current->euid ^ t->uid)
&& (current->uid ^ t->suid) && (current->uid ^ t->uid)
&& !capable(CAP_KILL))
diff --git a/kernel/sys.c b/kernel/sys.c
index 1ac2d1c5..4f9d23a 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1381,7 +1381,7 @@
if (p->real_parent == group_leader) {
err = -EPERM;
- if (p->signal->session != group_leader->signal->session)
+ if (process_session(p) != process_session(group_leader))
goto out;
err = -EACCES;
if (p->did_exec)
@@ -1400,7 +1400,7 @@
struct task_struct *p;
do_each_task_pid(pgid, PIDTYPE_PGID, p) {
- if (p->signal->session == group_leader->signal->session)
+ if (process_session(p) == process_session(group_leader))
goto ok_pgid;
} while_each_task_pid(pgid, PIDTYPE_PGID, p);
goto out;
@@ -1459,7 +1459,7 @@
asmlinkage long sys_getsid(pid_t pid)
{
if (!pid)
- return current->signal->session;
+ return process_session(current);
else {
int retval;
struct task_struct *p;
@@ -1471,7 +1471,7 @@
if (p) {
retval = security_task_getsid(p);
if (!retval)
- retval = p->signal->session;
+ retval = process_session(p);
}
read_unlock(&tasklist_lock);
return retval;