• Qiaowei Ren's avatar
    x86, mpx: Add MPX-specific mmap interface · 57319d80
    Qiaowei Ren authored
    We have chosen to perform the allocation of bounds tables in
    kernel (See the patch "on-demand kernel allocation of bounds
    tables") and to mark these VMAs with VM_MPX.
    
    However, there is currently no suitable interface to actually do
    this.  Existing interfaces, like do_mmap_pgoff(), have no way to
    set a modified ->vm_ops or ->vm_flags and don't hold mmap_sem
    long enough to let a caller do it.
    
    This patch wraps mmap_region() and hold mmap_sem long enough to
    make the modifications to the VMA which we need.
    
    Also note the 32/64-bit #ifdef in the header.  We actually need
    to do this at runtime eventually.  But, for now, we don't support
    running 32-bit binaries on 64-bit kernels.  Support for this will
    come in later patches.
    Signed-off-by: default avatarQiaowei Ren <qiaowei.ren@intel.com>
    Signed-off-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
    Cc: linux-mm@kvack.org
    Cc: linux-mips@linux-mips.org
    Cc: Dave Hansen <dave@sr71.net>
    Link: http://lkml.kernel.org/r/20141114151827.CE440F67@viggo.jf.intel.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    57319d80
mpx.c 1.88 KB