• Eric Paris's avatar
    Security: round mmap hint address above mmap_min_addr · 7cd94146
    Eric Paris authored
    If mmap_min_addr is set and a process attempts to mmap (not fixed) with a
    non-null hint address less than mmap_min_addr the mapping will fail the
    security checks.  Since this is just a hint address this patch will round
    such a hint address above mmap_min_addr.
    
    gcj was found to try to be very frugal with vm usage and give hint addresses
    in the 8k-32k range.  Without this patch all such programs failed and with
    the patch they happily get a higher address.
    
    This patch is wrappad in CONFIG_SECURITY since mmap_min_addr doesn't exist
    without it and there would be no security check possible no matter what.  So
    we should not bother compiling in this rounding if it is just a waste of
    time.
    Signed-off-by: default avatarEric Paris <eparis@redhat.com>
    Signed-off-by: default avatarJames Morris <jmorris@namei.org>
    7cd94146
nommu.c 33.1 KB