[PATCH 00/17] x86, mpx updates for 4.1 (take 2)

Dave Hansen
2015-03-26T18:33:22Z

Hi x86 maintainers,

It appeared that my attempt to send this earlier this week
failed to reach at least some of the intended recipients.
I updated a few of the patch descriptions and am resending.

There are 4 basic things going on here:
1. Make FPU/xsave code preempt safe and work properly
2. Add trace points to make kernel and app debugging easier
3. Add a boot-time disable for mpx
4. Support 32-bit binaries to run on 64-bit kernels

I've hesitated sending this in the past few weeks as
the FPU code had a lot of churn and affected our
ability to test on current kernels. It seems to have
settled down and appears more stable now.

These are available against 4.0-rc4 in git as well:

git://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-mpx.git mpx-v17

Dave Hansen (17):
x86, fpu: wrap get_xsave_addr() to make it safer
x86, mpx: use new tsk_get_xsave_addr()
x86, mpx: trace #BR exceptions
x86, mpx: trace entry to bounds exception paths
x86, mpx: trace when MPX is zapping pages
x86, mpx: trace attempts to find bounds tables
x86, mpx: trace allocation of new bounds tables
x86, mpx: boot-time disable
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 32-bit binaries on 64-bit kernel
x86, mpx: allow mixed binaries again

Documentation/kernel-parameters.txt | 4 +
arch/x86/include/asm/mmu_context.h | 13 ++
arch/x86/include/asm/mpx.h | 74 +++++-----
arch/x86/include/asm/page_types.h | 8 ++
arch/x86/include/asm/trace/mpx.h | 133 ++++++++++++++++++
arch/x86/include/asm/xsave.h | 1 +
arch/x86/kernel/cpu/common.c | 16 +++
arch/x86/kernel/traps.c | 12 +-
arch/x86/kernel/uprobes.c | 10 +-
arch/x86/kernel/xsave.c | 32 +++++
arch/x86/mm/mpx.c | 270 +++++++++++++++++++++++++++++-------
11 files changed, 469 insertions(+), 104 deletions(-)
create mode 100644 arch/x86/include/asm/trace/mpx.h

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1.9.1