x86_64: get rid of the use of KPROBE_ENTRY / KPROBE_END
Impact: clean up assembly macros and annotations - with some object impact entry_64.S is the only user of KPROBE_ENTRY / KPROBE_END on x86_64. This patch reorders entry_64.S and explicitly generates a separate section for functions that need the protection. The generated code before and after the patch is equal. Implicitly changing sections in assembly files makes it more difficult to follow why the assembler is doing certain things. For example, .p2align 5 KPROBE_ENTRY(...) was not doing what you would expect. Other section changes (__ex_table, .fixup, .init.rodata) are done explicitly already. Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Acked-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Alexander van Heukelum
Ingo Molnar
parent
3b6c52b5b6
commit
ddeb8f2149
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@ -1002,7 +1002,7 @@ END(\sym)
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.endm
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.macro paranoidzeroentry sym do_sym
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KPROBE_ENTRY(\sym)
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ENTRY(\sym)
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INTR_FRAME
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PARAVIRT_ADJUST_EXCEPTION_FRAME
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pushq $-1 /* ORIG_RAX: no syscall to restart */
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@ -1015,11 +1015,11 @@ KPROBE_ENTRY(\sym)
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call \do_sym
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jmp paranoid_exit /* %ebx: no swapgs flag */
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CFI_ENDPROC
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KPROBE_END(\sym)
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END(\sym)
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.endm
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.macro paranoidzeroentry_ist sym do_sym ist
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KPROBE_ENTRY(\sym)
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ENTRY(\sym)
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INTR_FRAME
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PARAVIRT_ADJUST_EXCEPTION_FRAME
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pushq $-1 /* ORIG_RAX: no syscall to restart */
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@ -1035,15 +1035,11 @@ KPROBE_ENTRY(\sym)
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addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)
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jmp paranoid_exit /* %ebx: no swapgs flag */
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CFI_ENDPROC
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KPROBE_END(\sym)
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END(\sym)
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.endm
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.macro errorentry sym do_sym entry=0
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.if \entry
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KPROBE_ENTRY(\sym)
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.else
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.macro errorentry sym do_sym
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ENTRY(\sym)
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.endif
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XCPT_FRAME
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PARAVIRT_ADJUST_EXCEPTION_FRAME
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subq $15*8,%rsp
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@ -1056,20 +1052,12 @@ ENTRY(\sym)
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call \do_sym
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jmp error_exit /* %ebx: no swapgs flag */
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CFI_ENDPROC
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.if \entry
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KPROBE_END(\sym)
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.else
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END(\sym)
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.endif
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.endm
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/* error code is on the stack already */
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.macro paranoiderrorentry sym do_sym entry=1
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.if \entry
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KPROBE_ENTRY(\sym)
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.else
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.macro paranoiderrorentry sym do_sym
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ENTRY(\sym)
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.endif
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XCPT_FRAME
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PARAVIRT_ADJUST_EXCEPTION_FRAME
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subq $15*8,%rsp
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@ -1083,166 +1071,23 @@ ENTRY(\sym)
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call \do_sym
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jmp paranoid_exit /* %ebx: no swapgs flag */
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CFI_ENDPROC
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.if \entry
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KPROBE_END(\sym)
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.else
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END(\sym)
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.endif
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.endm
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zeroentry divide_error do_divide_error
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paranoidzeroentry_ist debug do_debug DEBUG_STACK
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paranoidzeroentry_ist int3 do_int3 DEBUG_STACK
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zeroentry overflow do_overflow
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zeroentry bounds do_bounds
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zeroentry invalid_op do_invalid_op
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zeroentry device_not_available do_device_not_available
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paranoiderrorentry double_fault do_double_fault 0
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paranoiderrorentry double_fault do_double_fault
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zeroentry coprocessor_segment_overrun do_coprocessor_segment_overrun
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errorentry invalid_TSS do_invalid_TSS
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errorentry segment_not_present do_segment_not_present
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paranoiderrorentry stack_segment do_stack_segment
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errorentry general_protection do_general_protection 1
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errorentry page_fault do_page_fault 1
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zeroentry spurious_interrupt_bug do_spurious_interrupt_bug
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zeroentry coprocessor_error do_coprocessor_error
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errorentry alignment_check do_alignment_check
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#ifdef CONFIG_X86_MCE
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paranoidzeroentry machine_check do_machine_check
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#endif
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zeroentry simd_coprocessor_error do_simd_coprocessor_error
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/*
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* "Paranoid" exit path from exception stack.
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* Paranoid because this is used by NMIs and cannot take
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* any kernel state for granted.
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* We don't do kernel preemption checks here, because only
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* NMI should be common and it does not enable IRQs and
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* cannot get reschedule ticks.
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*
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* "trace" is 0 for the NMI handler only, because irq-tracing
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* is fundamentally NMI-unsafe. (we cannot change the soft and
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* hard flags at once, atomically)
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*/
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/* ebx: no swapgs flag */
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KPROBE_ENTRY(paranoid_exit)
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INTR_FRAME
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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testl %ebx,%ebx /* swapgs needed? */
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jnz paranoid_restore
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testl $3,CS(%rsp)
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jnz paranoid_userspace
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paranoid_swapgs:
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TRACE_IRQS_IRETQ 0
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SWAPGS_UNSAFE_STACK
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paranoid_restore:
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RESTORE_ALL 8
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jmp irq_return
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paranoid_userspace:
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GET_THREAD_INFO(%rcx)
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movl TI_flags(%rcx),%ebx
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andl $_TIF_WORK_MASK,%ebx
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jz paranoid_swapgs
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movq %rsp,%rdi /* &pt_regs */
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call sync_regs
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movq %rax,%rsp /* switch stack for scheduling */
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testl $_TIF_NEED_RESCHED,%ebx
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jnz paranoid_schedule
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movl %ebx,%edx /* arg3: thread flags */
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS(CLBR_NONE)
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xorl %esi,%esi /* arg2: oldset */
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movq %rsp,%rdi /* arg1: &pt_regs */
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call do_notify_resume
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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jmp paranoid_userspace
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paranoid_schedule:
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS(CLBR_ANY)
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call schedule
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DISABLE_INTERRUPTS(CLBR_ANY)
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TRACE_IRQS_OFF
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jmp paranoid_userspace
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CFI_ENDPROC
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KPROBE_END(paranoid_exit)
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/*
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* Exception entry point. This expects an error code/orig_rax on the stack.
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* returns in "no swapgs flag" in %ebx.
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*/
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KPROBE_ENTRY(error_entry)
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XCPT_FRAME
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CFI_ADJUST_CFA_OFFSET 15*8
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/* oldrax contains error code */
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cld
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movq_cfi rdi, RDI+8
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movq_cfi rsi, RSI+8
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movq_cfi rdx, RDX+8
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movq_cfi rcx, RCX+8
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movq_cfi rax, RAX+8
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movq_cfi r8, R8+8
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movq_cfi r9, R9+8
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movq_cfi r10, R10+8
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movq_cfi r11, R11+8
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movq_cfi rbx, RBX+8
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movq_cfi rbp, RBP+8
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movq_cfi r12, R12+8
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movq_cfi r13, R13+8
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movq_cfi r14, R14+8
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movq_cfi r15, R15+8
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xorl %ebx,%ebx
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testl $3,CS+8(%rsp)
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je error_kernelspace
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error_swapgs:
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SWAPGS
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error_sti:
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TRACE_IRQS_OFF
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ret
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CFI_ENDPROC
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/*
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* There are two places in the kernel that can potentially fault with
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* usergs. Handle them here. The exception handlers after iret run with
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* kernel gs again, so don't set the user space flag. B stepping K8s
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* sometimes report an truncated RIP for IRET exceptions returning to
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* compat mode. Check for these here too.
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*/
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error_kernelspace:
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incl %ebx
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leaq irq_return(%rip),%rcx
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cmpq %rcx,RIP+8(%rsp)
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je error_swapgs
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movl %ecx,%ecx /* zero extend */
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cmpq %rcx,RIP+8(%rsp)
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je error_swapgs
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cmpq $gs_change,RIP+8(%rsp)
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je error_swapgs
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jmp error_sti
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KPROBE_END(error_entry)
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/* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */
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KPROBE_ENTRY(error_exit)
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DEFAULT_FRAME
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movl %ebx,%eax
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RESTORE_REST
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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GET_THREAD_INFO(%rcx)
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testl %eax,%eax
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jne retint_kernel
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LOCKDEP_SYS_EXIT_IRQ
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movl TI_flags(%rcx),%edx
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movl $_TIF_WORK_MASK,%edi
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andl %edi,%edx
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jnz retint_careful
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jmp retint_swapgs
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CFI_ENDPROC
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KPROBE_END(error_exit)
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/* Reload gs selector with exception handling */
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/* edi: new selector */
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ENTRY(native_load_gs_index)
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@ -1362,61 +1207,6 @@ ENTRY(kernel_execve)
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CFI_ENDPROC
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END(kernel_execve)
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/* runs on exception stack */
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KPROBE_ENTRY(nmi)
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INTR_FRAME
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PARAVIRT_ADJUST_EXCEPTION_FRAME
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pushq_cfi $-1
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subq $15*8, %rsp
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CFI_ADJUST_CFA_OFFSET 15*8
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call save_paranoid
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DEFAULT_FRAME 0
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/* paranoidentry do_nmi, 0; without TRACE_IRQS_OFF */
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movq %rsp,%rdi
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movq $-1,%rsi
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call do_nmi
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#ifdef CONFIG_TRACE_IRQFLAGS
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/* paranoidexit; without TRACE_IRQS_OFF */
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/* ebx: no swapgs flag */
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DISABLE_INTERRUPTS(CLBR_NONE)
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testl %ebx,%ebx /* swapgs needed? */
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jnz nmi_restore
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testl $3,CS(%rsp)
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jnz nmi_userspace
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nmi_swapgs:
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SWAPGS_UNSAFE_STACK
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nmi_restore:
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RESTORE_ALL 8
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jmp irq_return
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nmi_userspace:
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GET_THREAD_INFO(%rcx)
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movl TI_flags(%rcx),%ebx
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andl $_TIF_WORK_MASK,%ebx
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jz nmi_swapgs
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movq %rsp,%rdi /* &pt_regs */
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call sync_regs
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movq %rax,%rsp /* switch stack for scheduling */
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testl $_TIF_NEED_RESCHED,%ebx
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jnz nmi_schedule
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movl %ebx,%edx /* arg3: thread flags */
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ENABLE_INTERRUPTS(CLBR_NONE)
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xorl %esi,%esi /* arg2: oldset */
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movq %rsp,%rdi /* arg1: &pt_regs */
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call do_notify_resume
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DISABLE_INTERRUPTS(CLBR_NONE)
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jmp nmi_userspace
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nmi_schedule:
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ENABLE_INTERRUPTS(CLBR_ANY)
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call schedule
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DISABLE_INTERRUPTS(CLBR_ANY)
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jmp nmi_userspace
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CFI_ENDPROC
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#else
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jmp paranoid_exit
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CFI_ENDPROC
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#endif
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KPROBE_END(nmi)
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/* Call softirq on interrupt stack. Interrupts are off. */
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ENTRY(call_softirq)
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CFI_STARTPROC
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@ -1437,13 +1227,6 @@ ENTRY(call_softirq)
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CFI_ENDPROC
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END(call_softirq)
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KPROBE_ENTRY(ignore_sysret)
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CFI_STARTPROC
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mov $-ENOSYS,%eax
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sysret
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CFI_ENDPROC
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KPROBE_END(ignore_sysret)
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#ifdef CONFIG_XEN
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zeroentry xen_hypervisor_callback xen_do_hypervisor_callback
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@ -1540,3 +1323,216 @@ ENTRY(xen_failsafe_callback)
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END(xen_failsafe_callback)
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#endif /* CONFIG_XEN */
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/*
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* Some functions should be protected against kprobes
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*/
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.pushsection .kprobes.text, "ax"
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paranoidzeroentry_ist debug do_debug DEBUG_STACK
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paranoidzeroentry_ist int3 do_int3 DEBUG_STACK
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paranoiderrorentry stack_segment do_stack_segment
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errorentry general_protection do_general_protection
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errorentry page_fault do_page_fault
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#ifdef CONFIG_X86_MCE
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paranoidzeroentry machine_check do_machine_check
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#endif
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/*
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* "Paranoid" exit path from exception stack.
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* Paranoid because this is used by NMIs and cannot take
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* any kernel state for granted.
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* We don't do kernel preemption checks here, because only
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* NMI should be common and it does not enable IRQs and
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* cannot get reschedule ticks.
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*
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* "trace" is 0 for the NMI handler only, because irq-tracing
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* is fundamentally NMI-unsafe. (we cannot change the soft and
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* hard flags at once, atomically)
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*/
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/* ebx: no swapgs flag */
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ENTRY(paranoid_exit)
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INTR_FRAME
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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testl %ebx,%ebx /* swapgs needed? */
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jnz paranoid_restore
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testl $3,CS(%rsp)
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jnz paranoid_userspace
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paranoid_swapgs:
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TRACE_IRQS_IRETQ 0
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SWAPGS_UNSAFE_STACK
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paranoid_restore:
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RESTORE_ALL 8
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jmp irq_return
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paranoid_userspace:
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GET_THREAD_INFO(%rcx)
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movl TI_flags(%rcx),%ebx
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andl $_TIF_WORK_MASK,%ebx
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jz paranoid_swapgs
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movq %rsp,%rdi /* &pt_regs */
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call sync_regs
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movq %rax,%rsp /* switch stack for scheduling */
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testl $_TIF_NEED_RESCHED,%ebx
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jnz paranoid_schedule
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movl %ebx,%edx /* arg3: thread flags */
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS(CLBR_NONE)
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xorl %esi,%esi /* arg2: oldset */
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movq %rsp,%rdi /* arg1: &pt_regs */
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call do_notify_resume
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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jmp paranoid_userspace
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paranoid_schedule:
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS(CLBR_ANY)
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call schedule
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DISABLE_INTERRUPTS(CLBR_ANY)
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TRACE_IRQS_OFF
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jmp paranoid_userspace
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CFI_ENDPROC
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END(paranoid_exit)
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/*
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* Exception entry point. This expects an error code/orig_rax on the stack.
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* returns in "no swapgs flag" in %ebx.
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*/
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ENTRY(error_entry)
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XCPT_FRAME
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CFI_ADJUST_CFA_OFFSET 15*8
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/* oldrax contains error code */
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cld
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movq_cfi rdi, RDI+8
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movq_cfi rsi, RSI+8
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movq_cfi rdx, RDX+8
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movq_cfi rcx, RCX+8
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movq_cfi rax, RAX+8
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movq_cfi r8, R8+8
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movq_cfi r9, R9+8
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movq_cfi r10, R10+8
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movq_cfi r11, R11+8
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movq_cfi rbx, RBX+8
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movq_cfi rbp, RBP+8
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movq_cfi r12, R12+8
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movq_cfi r13, R13+8
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movq_cfi r14, R14+8
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movq_cfi r15, R15+8
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xorl %ebx,%ebx
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testl $3,CS+8(%rsp)
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je error_kernelspace
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error_swapgs:
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SWAPGS
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error_sti:
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TRACE_IRQS_OFF
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ret
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CFI_ENDPROC
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/*
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* There are two places in the kernel that can potentially fault with
|
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* usergs. Handle them here. The exception handlers after iret run with
|
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* kernel gs again, so don't set the user space flag. B stepping K8s
|
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* sometimes report an truncated RIP for IRET exceptions returning to
|
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* compat mode. Check for these here too.
|
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*/
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error_kernelspace:
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incl %ebx
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leaq irq_return(%rip),%rcx
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cmpq %rcx,RIP+8(%rsp)
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je error_swapgs
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movl %ecx,%ecx /* zero extend */
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cmpq %rcx,RIP+8(%rsp)
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je error_swapgs
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cmpq $gs_change,RIP+8(%rsp)
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je error_swapgs
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jmp error_sti
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END(error_entry)
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/* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */
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ENTRY(error_exit)
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DEFAULT_FRAME
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movl %ebx,%eax
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RESTORE_REST
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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GET_THREAD_INFO(%rcx)
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testl %eax,%eax
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jne retint_kernel
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LOCKDEP_SYS_EXIT_IRQ
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movl TI_flags(%rcx),%edx
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movl $_TIF_WORK_MASK,%edi
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andl %edi,%edx
|
||||
jnz retint_careful
|
||||
jmp retint_swapgs
|
||||
CFI_ENDPROC
|
||||
END(error_exit)
|
||||
|
||||
|
||||
/* runs on exception stack */
|
||||
ENTRY(nmi)
|
||||
INTR_FRAME
|
||||
PARAVIRT_ADJUST_EXCEPTION_FRAME
|
||||
pushq_cfi $-1
|
||||
subq $15*8, %rsp
|
||||
CFI_ADJUST_CFA_OFFSET 15*8
|
||||
call save_paranoid
|
||||
DEFAULT_FRAME 0
|
||||
/* paranoidentry do_nmi, 0; without TRACE_IRQS_OFF */
|
||||
movq %rsp,%rdi
|
||||
movq $-1,%rsi
|
||||
call do_nmi
|
||||
#ifdef CONFIG_TRACE_IRQFLAGS
|
||||
/* paranoidexit; without TRACE_IRQS_OFF */
|
||||
/* ebx: no swapgs flag */
|
||||
DISABLE_INTERRUPTS(CLBR_NONE)
|
||||
testl %ebx,%ebx /* swapgs needed? */
|
||||
jnz nmi_restore
|
||||
testl $3,CS(%rsp)
|
||||
jnz nmi_userspace
|
||||
nmi_swapgs:
|
||||
SWAPGS_UNSAFE_STACK
|
||||
nmi_restore:
|
||||
RESTORE_ALL 8
|
||||
jmp irq_return
|
||||
nmi_userspace:
|
||||
GET_THREAD_INFO(%rcx)
|
||||
movl TI_flags(%rcx),%ebx
|
||||
andl $_TIF_WORK_MASK,%ebx
|
||||
jz nmi_swapgs
|
||||
movq %rsp,%rdi /* &pt_regs */
|
||||
call sync_regs
|
||||
movq %rax,%rsp /* switch stack for scheduling */
|
||||
testl $_TIF_NEED_RESCHED,%ebx
|
||||
jnz nmi_schedule
|
||||
movl %ebx,%edx /* arg3: thread flags */
|
||||
ENABLE_INTERRUPTS(CLBR_NONE)
|
||||
xorl %esi,%esi /* arg2: oldset */
|
||||
movq %rsp,%rdi /* arg1: &pt_regs */
|
||||
call do_notify_resume
|
||||
DISABLE_INTERRUPTS(CLBR_NONE)
|
||||
jmp nmi_userspace
|
||||
nmi_schedule:
|
||||
ENABLE_INTERRUPTS(CLBR_ANY)
|
||||
call schedule
|
||||
DISABLE_INTERRUPTS(CLBR_ANY)
|
||||
jmp nmi_userspace
|
||||
CFI_ENDPROC
|
||||
#else
|
||||
jmp paranoid_exit
|
||||
CFI_ENDPROC
|
||||
#endif
|
||||
END(nmi)
|
||||
|
||||
ENTRY(ignore_sysret)
|
||||
CFI_STARTPROC
|
||||
mov $-ENOSYS,%eax
|
||||
sysret
|
||||
CFI_ENDPROC
|
||||
END(ignore_sysret)
|
||||
|
||||
/*
|
||||
* End of kprobes section
|
||||
*/
|
||||
.popsection
|
||||
|
|
|
|||
Loading…
Reference in New Issue