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| author | David S. Miller <davem@davemloft.net> | 2012-02-10 23:32:28 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-02-10 23:32:28 -0500 |
| commit | d5ef8a4d87ab21d575ac86366599c9152a28028d (patch) | |
| tree | 8b1be85ad1af7ee6a0e3e36c77ae738c966c1f21 /kernel/fork.c | |
| parent | d9dd966d7fc088a6bed991c2b1e2fba4485e0a31 (diff) | |
| parent | 8df54d622a120058ee8bec38743c9b8f091c8e58 (diff) | |
| download | lwn-d5ef8a4d87ab21d575ac86366599c9152a28028d.tar.gz lwn-d5ef8a4d87ab21d575ac86366599c9152a28028d.zip | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts:
drivers/infiniband/hw/nes/nes_cm.c
Simple whitespace conflict.
Signed-off-by: David S. Miller <davem@davemloft.net>
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. |