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| author |   Grant Likely <grant.likely@secretlab.ca> | 2012-02-27 14:04:40 -0700 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2012-02-27 14:04:40 -0700 |
| commit | 29f141fed01a09050207c4d41fc5811520d81146 (patch) | |
| tree | c55a51dca4a0e4da9fdc2b904eefbde37d2a5b03 /kernel/fork.c | |
| parent | dt: add empty of_find_compatible_node function (diff) | |
| parent | doc: dt: Fix broken reference in gpio-leds documentation (diff) | |
| download | wireguard-linux-29f141fed01a09050207c4d41fc5811520d81146.tar.xz wireguard-linux-29f141fed01a09050207c4d41fc5811520d81146.zip | |
Merge branch 'fixes-for-grant' of git://sources.calxeda.com/kernel/linux into devicetree/merge
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 051f090d40c1..e2cd3e2a5ae8 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -66,6 +66,7 @@ #include <linux/user-return-notifier.h> #include <linux/oom.h> #include <linux/khugepaged.h> +#include <linux/signalfd.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> @@ -647,6 +648,26 @@ 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 +911,7 @@ 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; @@ -915,8 +936,10 @@ static int copy_sighand(unsigned long clone_flags, struct task_struct *tsk) void __cleanup_sighand(struct sighand_struct *sighand) { - if (atomic_dec_and_test(&sighand->count)) + if (atomic_dec_and_test(&sighand->count)) { + signalfd_cleanup(sighand); kmem_cache_free(sighand_cachep, sighand); + } } |