diff options
| author |   Arnd Bergmann <arnd@arndb.de> | 2012-02-27 13:40:41 +0000 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2012-02-27 13:40:49 +0000 |
| commit | 96a3eab338c01e172745b1686c51c1be96ce9ead (patch) | |
| tree | 5a53947a192549d9edf63550258e1bddf6f1d794 /kernel/fork.c | |
| parent | Merge branch 'at91-3.4-base+pm_cleanup' of git://github.com/at91linux/linux-at91 into next/cleanup (diff) | |
| parent | ARM: Remove redundant ';' from avic_irq_set_priority() (diff) | |
| download | wireguard-linux-96a3eab338c01e172745b1686c51c1be96ce9ead.tar.xz wireguard-linux-96a3eab338c01e172745b1686c51c1be96ce9ead.zip | |
Merge branch 'imx-cleanup' of git://git.pengutronix.de/git/imx/linux-2.6 into next/cleanup
* 'imx-cleanup' of git://git.pengutronix.de/git/imx/linux-2.6: (247 commits)
ARM: Remove redundant ';' from avic_irq_set_priority()
ARM: mx3: Let mx31 and mx35 share the same CCM header file
ARM: plat-mxc: audmux-v1: Remove unneeded ifdef's
Update to v3.3-rc3
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 051f090d40c1..1b2ef3c23ae4 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. |