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report errors in /proc/*/*map* sanely

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Al Viro
2011-02-15 22:22:54 -05:00
parent ca6b0bf0e0
commit ec6fd8a435
3 changed files with 13 additions and 11 deletions
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8
fs/proc/base.c
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@ -225,15 +225,17 @@ static int check_mem_permission(struct task_struct *task)
struct mm_struct *mm_for_maps(struct task_struct *task)
{
struct mm_struct *mm;
int err;
if (mutex_lock_killable(&task->signal->cred_guard_mutex))
return NULL;
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, PTRACE_MODE_READ)) {
mmput(mm);
mm = NULL;
mm = ERR_PTR(-EACCES);
}
mutex_unlock(&task->signal->cred_guard_mutex);