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| author |   Arnd Bergmann <arnd@arndb.de> | 2012-02-27 16:23:15 +0000 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2012-02-27 16:23:21 +0000 |
| commit | a173fc693b25216c5c834978f4fafd731fd4ff94 (patch) | |
| tree | f75c2fa106217cc3afd1bde6803ca77fe953bbcf /kernel/fork.c | |
| parent | Merge branch 'mxs/boards' of git://git.linaro.org/people/shawnguo/linux-2.6 into next/boards (diff) | |
| parent | ARM: kirkwood: convert uart0 to devicetree. (diff) | |
| download | wireguard-linux-a173fc693b25216c5c834978f4fafd731fd4ff94.tar.xz wireguard-linux-a173fc693b25216c5c834978f4fafd731fd4ff94.zip | |
Merge branch 'kirkwood/board' into next/boards
* kirkwood/board: (2 commits)
ARM: kirkwood: convert uart0 to devicetree.
ARM: kirkwood: add dreamplug (fdt) support.
Series sent by email from Jason Cooper <jason@lakedaemon.net>
Update to Linux 3.3-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. |