summaryrefslogtreecommitdiffstats
path: root/kernel/fork.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c117
1 files changed, 23 insertions, 94 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index b7d169def94..73ad5cda1bc 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -14,7 +14,6 @@
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/unistd.h>
-#include <linux/smp_lock.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/completion.h>
@@ -46,6 +45,7 @@
#include <linux/acct.h>
#include <linux/tsacct_kern.h>
#include <linux/cn_proc.h>
+#include <linux/freezer.h>
#include <linux/delayacct.h>
#include <linux/taskstats_kern.h>
#include <linux/random.h>
@@ -106,7 +106,7 @@ static struct kmem_cache *mm_cachep;
void free_task(struct task_struct *tsk)
{
- free_thread_info(tsk->thread_info);
+ free_thread_info(tsk->stack);
rt_mutex_debug_task_free(tsk);
free_task_struct(tsk);
}
@@ -176,7 +176,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
}
*tsk = *orig;
- tsk->thread_info = ti;
+ tsk->stack = ti;
setup_thread_stack(tsk, orig);
#ifdef CONFIG_CC_STACKPROTECTOR
@@ -876,6 +876,7 @@ static inline int copy_signal(unsigned long clone_flags, struct task_struct * ts
sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
+ sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
sig->sched_time = 0;
INIT_LIST_HEAD(&sig->cpu_timers[0]);
INIT_LIST_HEAD(&sig->cpu_timers[1]);
@@ -956,7 +957,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
unsigned long stack_size,
int __user *parent_tidptr,
int __user *child_tidptr,
- int pid)
+ struct pid *pid)
{
int retval;
struct task_struct *p = NULL;
@@ -1023,7 +1024,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->did_exec = 0;
delayacct_tsk_init(p); /* Must remain after dup_task_struct() */
copy_flags(clone_flags, p);
- p->pid = pid;
+ p->pid = pid_nr(pid);
retval = -EFAULT;
if (clone_flags & CLONE_PARENT_SETTID)
if (put_user(p->pid, parent_tidptr))
@@ -1252,13 +1253,13 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->signal->tty = current->signal->tty;
p->signal->pgrp = process_group(current);
set_signal_session(p->signal, process_session(current));
- attach_pid(p, PIDTYPE_PGID, process_group(p));
- attach_pid(p, PIDTYPE_SID, process_session(p));
+ attach_pid(p, PIDTYPE_PGID, task_pgrp(current));
+ attach_pid(p, PIDTYPE_SID, task_session(current));
list_add_tail_rcu(&p->tasks, &init_task.tasks);
__get_cpu_var(process_counts)++;
}
- attach_pid(p, PIDTYPE_PID, p->pid);
+ attach_pid(p, PIDTYPE_PID, pid);
nr_threads++;
}
@@ -1322,7 +1323,8 @@ struct task_struct * __cpuinit fork_idle(int cpu)
struct task_struct *task;
struct pt_regs regs;
- task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL, NULL, 0);
+ task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL, NULL,
+ &init_struct_pid);
if (!IS_ERR(task))
init_idle(task, cpu);
@@ -1372,7 +1374,7 @@ long do_fork(unsigned long clone_flags,
clone_flags |= CLONE_PTRACE;
}
- p = copy_process(clone_flags, stack_start, regs, stack_size, parent_tidptr, child_tidptr, nr);
+ p = copy_process(clone_flags, stack_start, regs, stack_size, parent_tidptr, child_tidptr, pid);
/*
* Do this prior waking up the new thread - the thread pointer
* might get invalid after that point, if the thread exits quickly.
@@ -1404,7 +1406,9 @@ long do_fork(unsigned long clone_flags,
}
if (clone_flags & CLONE_VFORK) {
+ freezer_do_not_count();
wait_for_completion(&vfork);
+ freezer_count();
if (unlikely (current->ptrace & PT_TRACE_VFORK_DONE)) {
current->ptrace_message = nr;
ptrace_notify ((PTRACE_EVENT_VFORK_DONE << 8) | SIGTRAP);
@@ -1421,12 +1425,13 @@ long do_fork(unsigned long clone_flags,
#define ARCH_MIN_MMSTRUCT_ALIGN 0
#endif
-static void sighand_ctor(void *data, struct kmem_cache *cachep, unsigned long flags)
+static void sighand_ctor(void *data, struct kmem_cache *cachep,
+ unsigned long flags)
{
struct sighand_struct *sighand = data;
- if (flags & SLAB_CTOR_CONSTRUCTOR)
- spin_lock_init(&sighand->siglock);
+ spin_lock_init(&sighand->siglock);
+ INIT_LIST_HEAD(&sighand->signalfd_list);
}
void __init proc_caches_init(void)
@@ -1452,7 +1457,6 @@ void __init proc_caches_init(void)
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
}
-
/*
* Check constraints on flags passed to the unshare system call and
* force unsharing of additional process context as appropriate.
@@ -1516,26 +1520,6 @@ static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp)
}
/*
- * Unshare the mnt_namespace structure if it is being shared
- */
-static int unshare_mnt_namespace(unsigned long unshare_flags,
- struct mnt_namespace **new_nsp, struct fs_struct *new_fs)
-{
- struct mnt_namespace *ns = current->nsproxy->mnt_ns;
-
- if ((unshare_flags & CLONE_NEWNS) && ns) {
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- *new_nsp = dup_mnt_ns(current, new_fs ? new_fs : current->fs);
- if (!*new_nsp)
- return -ENOMEM;
- }
-
- return 0;
-}
-
-/*
* Unsharing of sighand is not supported yet
*/
static int unshare_sighand(unsigned long unshare_flags, struct sighand_struct **new_sighp)
@@ -1593,16 +1577,6 @@ static int unshare_semundo(unsigned long unshare_flags, struct sem_undo_list **n
return 0;
}
-#ifndef CONFIG_IPC_NS
-static inline int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns)
-{
- if (flags & CLONE_NEWIPC)
- return -EINVAL;
-
- return 0;
-}
-#endif
-
/*
* unshare allows a process to 'unshare' part of the process
* context which was originally shared using clone. copy_*
@@ -1615,14 +1589,11 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
{
int err = 0;
struct fs_struct *fs, *new_fs = NULL;
- struct mnt_namespace *ns, *new_ns = NULL;
struct sighand_struct *new_sigh = NULL;
struct mm_struct *mm, *new_mm = NULL, *active_mm = NULL;
struct files_struct *fd, *new_fd = NULL;
struct sem_undo_list *new_ulist = NULL;
struct nsproxy *new_nsproxy = NULL, *old_nsproxy = NULL;
- struct uts_namespace *uts, *new_uts = NULL;
- struct ipc_namespace *ipc, *new_ipc = NULL;
check_unshare_flags(&unshare_flags);
@@ -1637,36 +1608,24 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
goto bad_unshare_out;
if ((err = unshare_fs(unshare_flags, &new_fs)))
goto bad_unshare_cleanup_thread;
- if ((err = unshare_mnt_namespace(unshare_flags, &new_ns, new_fs)))
- goto bad_unshare_cleanup_fs;
if ((err = unshare_sighand(unshare_flags, &new_sigh)))
- goto bad_unshare_cleanup_ns;
+ goto bad_unshare_cleanup_fs;
if ((err = unshare_vm(unshare_flags, &new_mm)))
goto bad_unshare_cleanup_sigh;
if ((err = unshare_fd(unshare_flags, &new_fd)))
goto bad_unshare_cleanup_vm;
if ((err = unshare_semundo(unshare_flags, &new_ulist)))
goto bad_unshare_cleanup_fd;
- if ((err = unshare_utsname(unshare_flags, &new_uts)))
+ if ((err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy,
+ new_fs)))
goto bad_unshare_cleanup_semundo;
- if ((err = unshare_ipcs(unshare_flags, &new_ipc)))
- goto bad_unshare_cleanup_uts;
-
- if (new_ns || new_uts || new_ipc) {
- old_nsproxy = current->nsproxy;
- new_nsproxy = dup_namespaces(old_nsproxy);
- if (!new_nsproxy) {
- err = -ENOMEM;
- goto bad_unshare_cleanup_ipc;
- }
- }
- if (new_fs || new_ns || new_mm || new_fd || new_ulist ||
- new_uts || new_ipc) {
+ if (new_fs || new_mm || new_fd || new_ulist || new_nsproxy) {
task_lock(current);
if (new_nsproxy) {
+ old_nsproxy = current->nsproxy;
current->nsproxy = new_nsproxy;
new_nsproxy = old_nsproxy;
}
@@ -1677,12 +1636,6 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
new_fs = fs;
}
- if (new_ns) {
- ns = current->nsproxy->mnt_ns;
- current->nsproxy->mnt_ns = new_ns;
- new_ns = ns;
- }
-
if (new_mm) {
mm = current->mm;
active_mm = current->active_mm;
@@ -1698,32 +1651,12 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
new_fd = fd;
}
- if (new_uts) {
- uts = current->nsproxy->uts_ns;
- current->nsproxy->uts_ns = new_uts;
- new_uts = uts;
- }
-
- if (new_ipc) {
- ipc = current->nsproxy->ipc_ns;
- current->nsproxy->ipc_ns = new_ipc;
- new_ipc = ipc;
- }
-
task_unlock(current);
}
if (new_nsproxy)
put_nsproxy(new_nsproxy);
-bad_unshare_cleanup_ipc:
- if (new_ipc)
- put_ipc_ns(new_ipc);
-
-bad_unshare_cleanup_uts:
- if (new_uts)
- put_uts_ns(new_uts);
-
bad_unshare_cleanup_semundo:
bad_unshare_cleanup_fd:
if (new_fd)
@@ -1738,10 +1671,6 @@ bad_unshare_cleanup_sigh:
if (atomic_dec_and_test(&new_sigh->count))
kmem_cache_free(sighand_cachep, new_sigh);
-bad_unshare_cleanup_ns:
- if (new_ns)
- put_mnt_ns(new_ns);
-
bad_unshare_cleanup_fs:
if (new_fs)
put_fs_struct(new_fs);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-22 02:54:34 +0000