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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6: mm_for_maps: take ->cred_guard_mutex to fix the race with exec mm_for_maps: shift down_read(mmap_sem) to the caller mm_for_maps: simplify, use ptrace_may_access()
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commit
9bcf73f482
@ -234,23 +234,20 @@ static int check_mem_permission(struct task_struct *task)
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struct mm_struct *mm_for_maps(struct task_struct *task)
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{
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struct mm_struct *mm = get_task_mm(task);
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if (!mm)
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struct mm_struct *mm;
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if (mutex_lock_killable(&task->cred_guard_mutex))
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return NULL;
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down_read(&mm->mmap_sem);
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task_lock(task);
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if (task->mm != mm)
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goto out;
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if (task->mm != current->mm &&
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__ptrace_may_access(task, PTRACE_MODE_READ) < 0)
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goto out;
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task_unlock(task);
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mm = get_task_mm(task);
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if (mm && mm != current->mm &&
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!ptrace_may_access(task, PTRACE_MODE_READ)) {
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mmput(mm);
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mm = NULL;
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}
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mutex_unlock(&task->cred_guard_mutex);
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return mm;
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out:
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task_unlock(task);
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up_read(&mm->mmap_sem);
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mmput(mm);
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return NULL;
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}
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static int proc_pid_cmdline(struct task_struct *task, char * buffer)
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@ -119,6 +119,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
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mm = mm_for_maps(priv->task);
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if (!mm)
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return NULL;
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down_read(&mm->mmap_sem);
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tail_vma = get_gate_vma(priv->task);
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priv->tail_vma = tail_vma;
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@ -189,6 +189,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
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priv->task = NULL;
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return NULL;
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}
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down_read(&mm->mmap_sem);
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/* start from the Nth VMA */
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for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
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