diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2012-02-22 14:20:07 +0000 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2012-02-22 14:20:18 +0000 |
| commit | 2daa79ec2126f8e710391e9d8e8f0d31d7c91d5f (patch) | |
| tree | ab89c74c09c2986fa01c25ad8e45989a48a18899 /kernel/fork.c | |
| parent | 7dae8c5209147ad06d424928a5f1ec45caa87691 (diff) | |
| parent | 678a0222edc9da43a22145d68647500ee85e6c04 (diff) | |
Merge branch 'lpc32xx/drivers' into next/drivers
* lpc32xx/drivers: (566 commits)
ARM: LPC32xx: ADC support for mach-lpc32xx
Includes an update to Linux 3.3-rc4
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 051f090d40c..b77fd559c78 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -647,6 +647,26 @@ struct mm_struct *get_task_mm(struct task_struct *task) } EXPORT_SYMBOL_GPL(get_task_mm); +struct mm_struct *mm_access(struct task_struct *task, unsigned int mode) +{ + struct mm_struct *mm; + int err; + + err = mutex_lock_killable(&task->signal->cred_guard_mutex); + if (err) + return ERR_PTR(err); + + mm = get_task_mm(task); + if (mm && mm != current->mm && + !ptrace_may_access(task, mode)) { + mmput(mm); + mm = ERR_PTR(-EACCES); + } + mutex_unlock(&task->signal->cred_guard_mutex); + + return mm; +} + /* Please note the differences between mmput and mm_release. * mmput is called whenever we stop holding onto a mm_struct, * error success whatever. @@ -890,7 +910,7 @@ static int copy_io(unsigned long clone_flags, struct task_struct *tsk) return -ENOMEM; new_ioc->ioprio = ioc->ioprio; - put_io_context(new_ioc, NULL); + put_io_context(new_ioc); } #endif return 0; |