• Jeff Dike's avatar
    uml: update address space affected by pud_clear · 8cd8fa55
    Jeff Dike authored
    pud_clear wasn't setting the _PAGE_NEWPAGE bit, fooling tlb_flush into
    thinking that this area of the address space was up-to-date and not unmapping
    whatever was covered by the pud.
    
    This manifested itself as ldconfig on x86_64 complaining about the first
    library it looked at not being a valid ELF file.  A config file is mapped at
    0x4000000, as the only thing mapped under its pud, and unmapped.  The
    unmapping caused a pud_clear, which, due to this bug, didn't actually unmap
    the config file data on the host.  The first library is then mapped at the
    same location, but is not actually mapped on the host because accesses to it
    cause no page faults.  As a result, ldconfig sees the old config file data.
    
    [akpm@linux-foundation.org: coding-style cleanups]
    Signed-off-by: default avatarJeff Dike <jdike@linux.intel.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    8cd8fa55
pgtable-3level.h 3.39 KB