• Ingo Molnar's avatar
    x86, mm: fault.c, enable PF_RSVD checks on 32-bit too · 121d5d0a
    Ingo Molnar authored
    Impact: improve page fault handling robustness
    
    The 'PF_RSVD' flag (bit 3) of the page-fault error_code is a
    relatively recent addition to x86 CPUs, so the 32-bit do_fault()
    implementation never had it. This flag gets set when the CPU
    detects nonzero values in any reserved bits of the page directory
    entries.
    
    Extend the existing 64-bit check for PF_RSVD in do_page_fault()
    to 32-bit too. If we detect such a fault then we print a more
    informative oops and the pagetables.
    
    This unifies the code some more, removes an ugly #ifdef and improves
    the 32-bit page fault code robustness a bit. It slightly increases
    the 32-bit kernel text size.
    
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    121d5d0a
fault.c 26.5 KB