• Ralf Baechle's avatar
    [MIPS] Fix aliasing bug in copy_user_highpage. · b868868a
    Ralf Baechle authored
    Copy_user_highpage was written assuming it was only being called for
    breaking COW pages in which case the source page isn't cached as in
    marked cachable under it kernel virtual address.  If it is called anyway
    the aliasing avoidance strategy implemented by kmap_coherent will fail.
    Avoid the use of kmap_coherent for pages marked dirty and to avoid
    another instance of this sort of bug, place a BUG_ON in kmap_coherent.
    Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
init.c 13 KB