linux.git/tools/testing/selftests/x86, branch v5.5

selftests/x86/single_step_syscall: Check SYSENTER directly

2019-11-26T20:53:34+00:00

We used to test SYSENTER only through the vDSO.  Test it directly
too, just in case.

Signed-off-by: Andy Lutomirski 
Cc: Borislav Petkov 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: Linus Torvalds 
Signed-off-by: Ingo Molnar

Merge branch 'x86-iopl-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2019-11-26T19:12:02+00:00

Pull x86 iopl updates from Ingo Molnar:
 "This implements a nice simplification of the iopl and ioperm code that
  Thomas Gleixner discovered: we can implement the IO privilege features
  of the iopl system call by using the IO permission bitmap in
  permissive mode, while trapping CLI/STI/POPF/PUSHF uses in user-space
  if they change the interrupt flag.

  This implements that feature, with testing facilities and related
  cleanups"

[ "Simplification" may be an over-statement. The main goal is to avoid
  the cli/sti of iopl by effectively implementing the IO port access
  parts of iopl in terms of ioperm.

  This may end up not workign well in case people actually depend on
  cli/sti being available, or if there are mixed uses of iopl and
  ioperm. We will see..       - Linus ]

* 'x86-iopl-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (22 commits)
  x86/ioperm: Fix use of deprecated config option
  x86/entry/32: Clarify register saving in __switch_to_asm()
  selftests/x86/iopl: Extend test to cover IOPL emulation
  x86/ioperm: Extend IOPL config to control ioperm() as well
  x86/iopl: Remove legacy IOPL option
  x86/iopl: Restrict iopl() permission scope
  x86/iopl: Fixup misleading comment
  selftests/x86/ioperm: Extend testing so the shared bitmap is exercised
  x86/ioperm: Share I/O bitmap if identical
  x86/ioperm: Remove bitmap if all permissions dropped
  x86/ioperm: Move TSS bitmap update to exit to user work
  x86/ioperm: Add bitmap sequence number
  x86/ioperm: Move iobitmap data into a struct
  x86/tss: Move I/O bitmap data into a seperate struct
  x86/io: Speedup schedule out of I/O bitmap user
  x86/ioperm: Avoid bitmap allocation if no permissions are set
  x86/ioperm: Simplify first ioperm() invocation logic
  x86/iopl: Cleanup include maze
  x86/tss: Fix and move VMX BUILD_BUG_ON()
  x86/cpu: Unify cpu_init()
  ...

selftests/x86/sigreturn/32: Invalidate DS and ES when abusing the kernel

2019-11-21T20:55:59+00:00

If the kernel accidentally uses DS or ES while the user values are
loaded, it will work fine for sane userspace.  In the interest of
simulating maximally insane userspace, make sigreturn_32 zero out DS
and ES for the nasty parts so that inadvertent use of these segments
will crash.

Signed-off-by: Andy Lutomirski 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: stable@kernel.org

selftests/x86/mov_ss_trap: Fix the SYSENTER test

2019-11-21T20:55:51+00:00

For reasons that I haven't quite fully diagnosed, running
mov_ss_trap_32 on a 32-bit kernel results in an infinite loop in
userspace.  This appears to be because the hacky SYSENTER test
doesn't segfault as desired; instead it corrupts the program state
such that it infinite loops.

Fix it by explicitly clearing EBP before doing SYSENTER.  This will
give a more reliable segfault.

Fixes: 59c2a7226fc5 ("x86/selftests: Add mov_to_ss test")
Signed-off-by: Andy Lutomirski 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: stable@kernel.org

selftests/x86/iopl: Extend test to cover IOPL emulation

2019-11-16T10:24:06+00:00

Add tests that the now emulated iopl() functionality:

    - does not longer allow user space to disable interrupts.

    - does restore a I/O bitmap when IOPL is dropped

Signed-off-by: Thomas Gleixner

selftests/x86/ioperm: Extend testing so the shared bitmap is exercised

2019-11-16T10:24:04+00:00

Add code to the fork path which forces the shared bitmap to be duplicated
and the reference count to be dropped. Verify that the child modifications
did not affect the parent.

Signed-off-by: Thomas Gleixner

Merge branch 'x86-entry-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2019-09-17T02:06:29+00:00

Pull x86 entry updates from Ingo Molnar:
 "This contains x32 and compat syscall improvements, the biggest one of
  which splits x32 syscalls into their own table, which allows new
  syscalls to share the x32 and x86-64 number - which turns the
  512-547 special syscall numbers range into a legacy wart that won't be
  extended going forward"

* 'x86-entry-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/syscalls: Split the x32 syscalls into their own table
  x86/syscalls: Disallow compat entries for all types of 64-bit syscalls
  x86/syscalls: Use the compat versions of rt_sigsuspend() and rt_sigprocmask()
  x86/syscalls: Make __X32_SYSCALL_BIT be unsigned long

Merge branch 'x86/cleanups' into x86/cpu, to pick up dependent changes

2019-09-06T05:30:23+00:00

Signed-off-by: Ingo Molnar

selftests/x86: fix spelling mistake "FAILT" -> "FAIL"

2019-07-23T16:45:15+00:00

There is an spelling mistake in an a test error message. Fix it.

Acked-by: Andy Lutomirski 
Signed-off-by: Colin Ian King 
Signed-off-by: Shuah Khan

x86/mpx: Remove selftests themselves

2019-07-22T09:54:56+00:00

MPX is being removed from the kernel due to a lack of support in the
toolchain going forward (gcc).

Remove the x86 selftests since they have been causing some issues because
of their propensity to do some debug-aiding tracepoint mucking.

Signed-off-by: Dave Hansen 
Signed-off-by: Thomas Gleixner 
Link: https://lkml.kernel.org/r/20190705175320.6542F8AE@viggo.jf.intel.com