diff options
| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-08-19 18:21:52 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-08-19 18:21:52 -0400 |
| commit | 6a396f67d2442e30150ffb5e1142dbb2f2181d3f (patch) | |
| tree | 2ea4f3ab1d3766204a55ec26600b848ed3a7e8aa /fs/proc/base.c | |
| parent | f884dcaead5f17bf586ac5fe6a3ad07b5203616a (diff) | |
| parent | cccddf4f5580131c9b963900e1d3400655e633cc (diff) | |
| download | linux-6a396f67d2442e30150ffb5e1142dbb2f2181d3f.tar.gz linux-6a396f67d2442e30150ffb5e1142dbb2f2181d3f.tar.xz | |
Merge branch 'nfsv4_xdr_cleanups-for-2.6.32' into nfs-for-2.6.32
Conflicts:
fs/nfs/nfs4xdr.c
Diffstat (limited to 'fs/proc/base.c')
| -rw-r--r-- | fs/proc/base.c | 27 |
1 files changed, 12 insertions, 15 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 3ce5ae9e3d2d..175db258942f 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -234,23 +234,20 @@ static int check_mem_permission(struct task_struct *task) struct mm_struct *mm_for_maps(struct task_struct *task) { - struct mm_struct *mm = get_task_mm(task); - if (!mm) + struct mm_struct *mm; + + if (mutex_lock_killable(&task->cred_guard_mutex)) return NULL; - down_read(&mm->mmap_sem); - task_lock(task); - if (task->mm != mm) - goto out; - if (task->mm != current->mm && - __ptrace_may_access(task, PTRACE_MODE_READ) < 0) - goto out; - task_unlock(task); + + mm = get_task_mm(task); + if (mm && mm != current->mm && + !ptrace_may_access(task, PTRACE_MODE_READ)) { + mmput(mm); + mm = NULL; + } + mutex_unlock(&task->cred_guard_mutex); + return mm; -out: - task_unlock(task); - up_read(&mm->mmap_sem); - mmput(mm); - return NULL; } static int proc_pid_cmdline(struct task_struct *task, char * buffer) |