• Steven Rostedt's avatar
    enable interrupts in user path of page fault. · e5e3c84b
    Steven Rostedt authored
    
    
    This is a minor fix, but what is currently there is essentially wrong.
    In do_page_fault, if the faulting address from user code happens to be
    in kernel address space (int *p = (int*)-1; p = 0xbed;)  then the
    do_page_fault handler will jump over the local_irq_enable with the
    
      goto bad_area_nosemaphore;
    
    But the first line there sees this is user code and goes through the
    process of sending a signal to send SIGSEGV to the user task. This whole
    time interrupts are disabled and the task can not be preempted by a
    higher priority task.
    
    This patch always enables interrupts in the user path of the
    bad_area_nosemaphore.
    Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    e5e3c84b
fault.c 16.9 KB