x86/uaccess: Remove redundant CLACs in getuser/putuser error paths
The same getuser/putuser error paths are used regardless of whether AC is set. In non-exception failure cases, this results in an unnecessary CLAC. Fixes the following warnings: arch/x86/lib/getuser.o: warning: objtool: .altinstr_replacement+0x18: redundant UACCESS disable arch/x86/lib/putuser.o: warning: objtool: .altinstr_replacement+0x18: redundant UACCESS disable Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/bc14ded2755ae75bd9010c446079e113dbddb74b.1563413318.git.jpoimboe@redhat.com
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@ -115,29 +115,29 @@ ENDPROC(__get_user_8)
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EXPORT_SYMBOL(__get_user_8)
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EXPORT_SYMBOL(__get_user_8)
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bad_get_user_clac:
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ASM_CLAC
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bad_get_user:
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bad_get_user:
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xor %edx,%edx
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xor %edx,%edx
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mov $(-EFAULT),%_ASM_AX
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mov $(-EFAULT),%_ASM_AX
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ASM_CLAC
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ret
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ret
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END(bad_get_user)
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#ifdef CONFIG_X86_32
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#ifdef CONFIG_X86_32
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bad_get_user_8_clac:
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ASM_CLAC
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bad_get_user_8:
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bad_get_user_8:
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xor %edx,%edx
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xor %edx,%edx
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xor %ecx,%ecx
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xor %ecx,%ecx
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mov $(-EFAULT),%_ASM_AX
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mov $(-EFAULT),%_ASM_AX
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ASM_CLAC
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ret
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ret
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END(bad_get_user_8)
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#endif
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#endif
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_ASM_EXTABLE_UA(1b, bad_get_user)
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_ASM_EXTABLE_UA(1b, bad_get_user_clac)
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_ASM_EXTABLE_UA(2b, bad_get_user)
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_ASM_EXTABLE_UA(2b, bad_get_user_clac)
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_ASM_EXTABLE_UA(3b, bad_get_user)
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_ASM_EXTABLE_UA(3b, bad_get_user_clac)
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#ifdef CONFIG_X86_64
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#ifdef CONFIG_X86_64
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_ASM_EXTABLE_UA(4b, bad_get_user)
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_ASM_EXTABLE_UA(4b, bad_get_user_clac)
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#else
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#else
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_ASM_EXTABLE_UA(4b, bad_get_user_8)
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_ASM_EXTABLE_UA(4b, bad_get_user_8_clac)
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_ASM_EXTABLE_UA(5b, bad_get_user_8)
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_ASM_EXTABLE_UA(5b, bad_get_user_8_clac)
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#endif
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#endif
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@ -32,8 +32,6 @@
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*/
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*/
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#define ENTER mov PER_CPU_VAR(current_task), %_ASM_BX
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#define ENTER mov PER_CPU_VAR(current_task), %_ASM_BX
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#define EXIT ASM_CLAC ; \
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ret
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.text
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.text
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ENTRY(__put_user_1)
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ENTRY(__put_user_1)
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@ -43,7 +41,8 @@ ENTRY(__put_user_1)
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ASM_STAC
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ASM_STAC
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1: movb %al,(%_ASM_CX)
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1: movb %al,(%_ASM_CX)
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xor %eax,%eax
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xor %eax,%eax
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EXIT
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ASM_CLAC
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ret
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ENDPROC(__put_user_1)
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ENDPROC(__put_user_1)
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EXPORT_SYMBOL(__put_user_1)
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EXPORT_SYMBOL(__put_user_1)
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@ -56,7 +55,8 @@ ENTRY(__put_user_2)
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ASM_STAC
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ASM_STAC
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2: movw %ax,(%_ASM_CX)
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2: movw %ax,(%_ASM_CX)
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xor %eax,%eax
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xor %eax,%eax
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EXIT
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ASM_CLAC
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ret
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ENDPROC(__put_user_2)
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ENDPROC(__put_user_2)
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EXPORT_SYMBOL(__put_user_2)
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EXPORT_SYMBOL(__put_user_2)
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@ -69,7 +69,8 @@ ENTRY(__put_user_4)
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ASM_STAC
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ASM_STAC
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3: movl %eax,(%_ASM_CX)
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3: movl %eax,(%_ASM_CX)
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xor %eax,%eax
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xor %eax,%eax
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EXIT
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ASM_CLAC
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ret
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ENDPROC(__put_user_4)
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ENDPROC(__put_user_4)
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EXPORT_SYMBOL(__put_user_4)
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EXPORT_SYMBOL(__put_user_4)
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@ -85,19 +86,21 @@ ENTRY(__put_user_8)
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5: movl %edx,4(%_ASM_CX)
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5: movl %edx,4(%_ASM_CX)
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#endif
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#endif
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xor %eax,%eax
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xor %eax,%eax
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EXIT
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ASM_CLAC
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RET
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ENDPROC(__put_user_8)
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ENDPROC(__put_user_8)
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EXPORT_SYMBOL(__put_user_8)
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EXPORT_SYMBOL(__put_user_8)
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bad_put_user_clac:
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ASM_CLAC
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bad_put_user:
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bad_put_user:
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movl $-EFAULT,%eax
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movl $-EFAULT,%eax
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EXIT
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RET
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END(bad_put_user)
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_ASM_EXTABLE_UA(1b, bad_put_user)
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_ASM_EXTABLE_UA(1b, bad_put_user_clac)
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_ASM_EXTABLE_UA(2b, bad_put_user)
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_ASM_EXTABLE_UA(2b, bad_put_user_clac)
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_ASM_EXTABLE_UA(3b, bad_put_user)
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_ASM_EXTABLE_UA(3b, bad_put_user_clac)
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_ASM_EXTABLE_UA(4b, bad_put_user)
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_ASM_EXTABLE_UA(4b, bad_put_user_clac)
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#ifdef CONFIG_X86_32
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#ifdef CONFIG_X86_32
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_ASM_EXTABLE_UA(5b, bad_put_user)
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_ASM_EXTABLE_UA(5b, bad_put_user_clac)
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#endif
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#endif
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