On 12/12/2014 11:12 AM, Dave Hansen wrote:
This is 3.20 material. I'm hoping to get some comments early in case folks have some issues with the way it's being done.
Would it make sense to disable MPX for 32-bit binaries on 64-bit kernels for 3.19?
--Andy
-- The MPX hardware structures differ in layout in 32 and 64-bit mode. A 32-bit binary running on a 64-bit kernel needs the 32-bit structures, so we need code which switches between the two modes. The first patch is just a documentation update. The next 5 patches are really just prepwork. The meat is in the last 3. x86: make is_64bit_mm() widely available x86: make __VIRTUAL_MASK safe to use on 32 bit x86, mpx: we do not allocate the bounds directory x86, mpx: remove redundant MPX_BNDCFG_ADDR_MASK x86, mpx: Add temporary variable to reduce masking x86, mpx: new directory entry to addr helper x86, mpx: do 32-bit-only cmpxchg for 32-bit apps x86, mpx: support 32bit binaries on 64bit kernel Documentation/x86/intel_mpx.txt | 12 +++- arch/x86/include/asm/mmu_context.h | 13 +++++ arch/x86/include/asm/mpx.h | 2 arch/x86/include/asm/page_types.h | 8 +++ arch/x86/kernel/uprobes.c | 10 --- arch/x86/mm/mpx.c | 93 ++++++++++++++++++++++++++++++------- 6 files changed, 107 insertions(+), 31 deletions(-)
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