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[PATCH] add process_session() helper routine

Browse source 
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>
This commit is contained in:
Cedric Le Goater 2006-12-08 02:37:54 -08:00 committed by Linus Torvalds
parent ef55d53caa
commit 937949d9ed
11 changed files with 35 additions and 29 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/mips/kernel/irixelf.c
View file

@ -1145,7 +1145,7 @@ static int irix_core_dump(long signr, struct pt_regs * regs, struct file *file)
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

2
drivers/char/mxser.c
View file

@ -994,7 +994,7 @@ static int mxser_open(struct tty_struct *tty, struct file *filp)
mxser_change_speed(info, NULL);
}
info->session = current->signal->session;
info->session = process_session(current);
info->pgrp = process_group(current);
/*

2
drivers/char/rocket.c
View file

@ -1017,7 +1017,7 @@ static int rp_open(struct tty_struct *tty, struct file *filp)
/*
* 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) {

12
drivers/char/tty_io.c
View file

@ -1511,7 +1511,7 @@ void disassociate_ctty(int on_exit)
spin_lock_irq(&current->sighand->siglock);
current->signal->tty_old_pgrp = 0;
session = current->signal->session;
session = process_session(current);
spin_unlock_irq(&current->sighand->siglock);
mutex_lock(&tty_mutex);
@ -2897,7 +2897,7 @@ static int tiocsctty(struct tty_struct *tty, int arg)
{
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 @@ static int tiocspgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t
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 @@ static void __do_SAK(struct work_struct *work)
/* 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 @@ static void __do_SAK(struct work_struct *work)
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;

4
fs/binfmt_elf.c
View file

@ -1317,7 +1317,7 @@ static void fill_prstatus(struct elf_prstatus *prstatus,
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 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
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;

4
fs/binfmt_elf_fdpic.c
View file

@ -1322,7 +1322,7 @@ static void fill_prstatus(struct elf_prstatus *prstatus,
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 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
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;

5
include/linux/sched.h
View file

@ -1047,6 +1047,11 @@ static inline pid_t process_group(struct task_struct *tsk)
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;

19
kernel/exit.c
View file

@ -193,14 +193,14 @@ int session_of_pgrp(int pgrp)
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 @@ static int will_become_orphaned_pgrp(int pgrp, struct task_struct *ignored_task)
|| 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 @@ void __set_special_pids(pid_t session, pid_t pgrp)
{
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 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
* 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 @@ static void exit_notify(struct task_struct *tsk)
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));

4
kernel/fork.c
View file

@ -1259,9 +1259,9 @@ static struct task_struct *copy_process(unsigned long clone_flags,
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)++;

2
kernel/signal.c
View file

@ -583,7 +583,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
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))

8
kernel/sys.c
View file

@ -1381,7 +1381,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
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 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
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_getpgrp(void)
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 @@ asmlinkage long sys_getsid(pid_t pid)
if (p) {
retval = security_task_getsid(p);
if (!retval)
retval = p->signal->session;
retval = process_session(p);
}
read_unlock(&tasklist_lock);
return retval;