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x86-32, smap: Add STAC/CLAC instructions to 32-bit kernel entry
The changes to entry_32.S got missed in checkin:
63bcff2a x86, smap: Add STAC and CLAC instructions to control user space access
The resulting kernel was largely functional but SMAP protection could
have been bypassed.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-9-git-send-email-hpa@linux.intel.com
This commit is contained in:
H. Peter Anvin
parent
5e88353d8b
commit
e59d1b0a24
@ -57,6 +57,7 @@
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#include <asm/cpufeature.h>
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#include <asm/alternative-asm.h>
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#include <asm/asm.h>
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#include <asm/smap.h>
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/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */
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#include <linux/elf-em.h>
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@ -407,7 +408,9 @@ sysenter_past_esp:
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*/
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cmpl $__PAGE_OFFSET-3,%ebp
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jae syscall_fault
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ASM_STAC
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1: movl (%ebp),%ebp
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ASM_CLAC
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movl %ebp,PT_EBP(%esp)
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_ASM_EXTABLE(1b,syscall_fault)
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@ -488,6 +491,7 @@ ENDPROC(ia32_sysenter_target)
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# system call handler stub
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ENTRY(system_call)
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RING0_INT_FRAME # can't unwind into user space anyway
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ASM_CLAC
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pushl_cfi %eax # save orig_eax
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SAVE_ALL
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GET_THREAD_INFO(%ebp)
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@ -670,6 +674,7 @@ END(syscall_exit_work)
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RING0_INT_FRAME # can't unwind into user space anyway
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syscall_fault:
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ASM_CLAC
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GET_THREAD_INFO(%ebp)
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movl $-EFAULT,PT_EAX(%esp)
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jmp resume_userspace
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@ -825,6 +830,7 @@ END(interrupt)
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*/
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.p2align CONFIG_X86_L1_CACHE_SHIFT
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common_interrupt:
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ASM_CLAC
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addl $-0x80,(%esp) /* Adjust vector into the [-256,-1] range */
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SAVE_ALL
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TRACE_IRQS_OFF
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@ -841,6 +847,7 @@ ENDPROC(common_interrupt)
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#define BUILD_INTERRUPT3(name, nr, fn) \
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ENTRY(name) \
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RING0_INT_FRAME; \
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ASM_CLAC; \
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pushl_cfi $~(nr); \
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SAVE_ALL; \
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TRACE_IRQS_OFF \
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@ -857,6 +864,7 @@ ENDPROC(name)
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ENTRY(coprocessor_error)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi $0
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pushl_cfi $do_coprocessor_error
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jmp error_code
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@ -865,6 +873,7 @@ END(coprocessor_error)
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ENTRY(simd_coprocessor_error)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi $0
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#ifdef CONFIG_X86_INVD_BUG
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/* AMD 486 bug: invd from userspace calls exception 19 instead of #GP */
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@ -886,6 +895,7 @@ END(simd_coprocessor_error)
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ENTRY(device_not_available)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi $-1 # mark this as an int
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pushl_cfi $do_device_not_available
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jmp error_code
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@ -906,6 +916,7 @@ END(native_irq_enable_sysexit)
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ENTRY(overflow)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi $0
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pushl_cfi $do_overflow
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jmp error_code
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@ -914,6 +925,7 @@ END(overflow)
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ENTRY(bounds)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi $0
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pushl_cfi $do_bounds
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jmp error_code
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@ -922,6 +934,7 @@ END(bounds)
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ENTRY(invalid_op)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi $0
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pushl_cfi $do_invalid_op
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jmp error_code
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@ -930,6 +943,7 @@ END(invalid_op)
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ENTRY(coprocessor_segment_overrun)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi $0
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pushl_cfi $do_coprocessor_segment_overrun
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jmp error_code
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@ -938,6 +952,7 @@ END(coprocessor_segment_overrun)
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ENTRY(invalid_TSS)
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RING0_EC_FRAME
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ASM_CLAC
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pushl_cfi $do_invalid_TSS
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jmp error_code
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CFI_ENDPROC
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@ -945,6 +960,7 @@ END(invalid_TSS)
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ENTRY(segment_not_present)
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RING0_EC_FRAME
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ASM_CLAC
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pushl_cfi $do_segment_not_present
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jmp error_code
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CFI_ENDPROC
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@ -952,6 +968,7 @@ END(segment_not_present)
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ENTRY(stack_segment)
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RING0_EC_FRAME
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ASM_CLAC
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pushl_cfi $do_stack_segment
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jmp error_code
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CFI_ENDPROC
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@ -959,6 +976,7 @@ END(stack_segment)
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ENTRY(alignment_check)
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RING0_EC_FRAME
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ASM_CLAC
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pushl_cfi $do_alignment_check
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jmp error_code
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CFI_ENDPROC
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@ -966,6 +984,7 @@ END(alignment_check)
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ENTRY(divide_error)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi $0 # no error code
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pushl_cfi $do_divide_error
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jmp error_code
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@ -975,6 +994,7 @@ END(divide_error)
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#ifdef CONFIG_X86_MCE
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ENTRY(machine_check)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi $0
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pushl_cfi machine_check_vector
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jmp error_code
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@ -984,6 +1004,7 @@ END(machine_check)
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ENTRY(spurious_interrupt_bug)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi $0
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pushl_cfi $do_spurious_interrupt_bug
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jmp error_code
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@ -1207,6 +1228,7 @@ return_to_handler:
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ENTRY(page_fault)
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RING0_EC_FRAME
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ASM_CLAC
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pushl_cfi $do_page_fault
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ALIGN
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error_code:
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@ -1279,6 +1301,7 @@ END(page_fault)
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ENTRY(debug)
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RING0_INT_FRAME
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ASM_CLAC
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cmpl $ia32_sysenter_target,(%esp)
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jne debug_stack_correct
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FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn
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@ -1303,6 +1326,7 @@ END(debug)
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*/
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ENTRY(nmi)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi %eax
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movl %ss, %eax
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cmpw $__ESPFIX_SS, %ax
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@ -1373,6 +1397,7 @@ END(nmi)
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ENTRY(int3)
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RING0_INT_FRAME
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ASM_CLAC
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pushl_cfi $-1 # mark this as an int
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SAVE_ALL
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TRACE_IRQS_OFF
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@ -1393,6 +1418,7 @@ END(general_protection)
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#ifdef CONFIG_KVM_GUEST
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ENTRY(async_page_fault)
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RING0_EC_FRAME
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ASM_CLAC
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pushl_cfi $do_async_page_fault
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jmp error_code
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CFI_ENDPROC
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