From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 5 Jun 2014 14:46:15 +0000 (-0700)
Subject: Merge branch 'x86/espfix' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip... 
X-Git-Tag: Ubuntu-5.0.0-8.9~11397^2~14
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=2071b3e34fd33e496ebd7b90331ac5b3b0ac3b81;p=mirror_ubuntu-disco-kernel.git

Merge branch 'x86/espfix' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next

Pull x86-64 espfix changes from Peter Anvin:
 "This is the espfix64 code, which fixes the IRET information leak as
  well as the associated functionality problem.  With this code applied,
  16-bit stack segments finally work as intended even on a 64-bit
  kernel.

  Consequently, this patchset also removes the runtime option that we
  added as an interim measure.

  To help the people working on Linux kernels for very small systems,
  this patchset also makes these compile-time configurable features"

* 'x86/espfix' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Revert "x86-64, modify_ldt: Make support for 16-bit segments a runtime option"
  x86, espfix: Make it possible to disable 16-bit support
  x86, espfix: Make espfix64 a Kconfig option, fix UML
  x86, espfix: Fix broken header guard
  x86, espfix: Move espfix definitions into a separate header file
  x86-32, espfix: Remove filter for espfix32 due to race
  x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stack
---

2071b3e34fd33e496ebd7b90331ac5b3b0ac3b81
diff --cc arch/x86/kernel/entry_64.S
index be846d2468f7,da0b9bdcc32e..96987987c5de
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@@ -1284,19 -1362,39 +1357,19 @@@ idtentry \sym \do_sym has_error_code=\h
  .endm
  #endif
  
 -	/* error code is on the stack already */
 -.macro paranoiderrorentry sym do_sym
 -ENTRY(\sym)
 -	XCPT_FRAME
 -	ASM_CLAC
 -	PARAVIRT_ADJUST_EXCEPTION_FRAME
 -	subq $ORIG_RAX-R15, %rsp
 -	CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
 -	call save_paranoid
 -	DEFAULT_FRAME 0
 -	TRACE_IRQS_OFF
 -	movq %rsp,%rdi			/* pt_regs pointer */
 -	movq ORIG_RAX(%rsp),%rsi	/* get error code */
 -	movq $-1,ORIG_RAX(%rsp)		/* no syscall to restart */
 -	call \do_sym
 -	jmp paranoid_exit		/* %ebx: no swapgs flag */
 -	CFI_ENDPROC
 -END(\sym)
 -.endm
 -
 -zeroentry divide_error do_divide_error
 -zeroentry overflow do_overflow
 -zeroentry bounds do_bounds
 -zeroentry invalid_op do_invalid_op
 -zeroentry device_not_available do_device_not_available
 -paranoiderrorentry double_fault __do_double_fault
 -zeroentry coprocessor_segment_overrun do_coprocessor_segment_overrun
 -errorentry invalid_TSS do_invalid_TSS
 -errorentry segment_not_present do_segment_not_present
 -zeroentry spurious_interrupt_bug do_spurious_interrupt_bug
 -zeroentry coprocessor_error do_coprocessor_error
 -errorentry alignment_check do_alignment_check
 -zeroentry simd_coprocessor_error do_simd_coprocessor_error
 +idtentry divide_error do_divide_error has_error_code=0
 +idtentry overflow do_overflow has_error_code=0
 +idtentry bounds do_bounds has_error_code=0
 +idtentry invalid_op do_invalid_op has_error_code=0
 +idtentry device_not_available do_device_not_available has_error_code=0
- idtentry double_fault do_double_fault has_error_code=1 paranoid=1
++idtentry double_fault __do_double_fault has_error_code=1 paranoid=1
 +idtentry coprocessor_segment_overrun do_coprocessor_segment_overrun has_error_code=0
 +idtentry invalid_TSS do_invalid_TSS has_error_code=1
 +idtentry segment_not_present do_segment_not_present has_error_code=1
 +idtentry spurious_interrupt_bug do_spurious_interrupt_bug has_error_code=0
 +idtentry coprocessor_error do_coprocessor_error has_error_code=0
 +idtentry alignment_check do_alignment_check has_error_code=1
 +idtentry simd_coprocessor_error do_simd_coprocessor_error has_error_code=0
  
  
  	/* Reload gs selector with exception handling */