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| author | Arnd Bergmann <arnd@arndb.de> | 2012-02-27 12:58:59 +0000 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2012-02-27 12:59:03 +0000 |
| commit | d0cdd82c6e0944df733b28f5d4cbbe97298587e4 (patch) | |
| tree | 9de205625a4657fedbfae52c65ea017beb7509a8 /kernel/fork.c | |
| parent | 747303a383d59a4d4667152fb68293dd9ff06438 (diff) | |
| parent | 9418ba306688c0b77a8548b3281ba3d130036516 (diff) | |
Merge branch 'imx-fixes' of git://git.pengutronix.de/git/imx/linux-2.6 into next/fixes-non-critical
* 'imx-fixes' of git://git.pengutronix.de/git/imx/linux-2.6: (247 commits)
ARM: mach-imx: mx3: Fix section mismatch in imx3_init_l2x0()
ARM: imx_v4_v5_defconfig: Fix the selection of 32 bit flash support for iMX21ADS board
ARM: mach-pcm038: Fix field name of regulator_consumer_supply struct
Also includes an 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 051f090d40c..1b2ef3c23ae 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. |