Re: [PATCH 2/2] arm: kprobes: Prohibit kprobes on get_user functions

From: kbuild test robot
Date: Sun Feb 25 2018 - 05:10:08 EST

Hi Masami,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.16-rc2 next-20180223]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Masami-Hiramatsu/arm-kprobes-Prohibit-kprobes-on-do_undefinstr/20180225-151050
config: arm-ixp4xx_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=arm

All errors (new ones prefixed by >>):

arch/arm/lib/getuser.S: Assembler messages:
arch/arm/lib/getuser.S:41: Error: bad instruction `_asm_nokprobe(__get_user_1)'
arch/arm/lib/getuser.S:62: Error: bad instruction `_asm_nokprobe(__get_user_2)'
arch/arm/lib/getuser.S:70: Error: bad instruction `_asm_nokprobe(__get_user_4)'
arch/arm/lib/getuser.S:84: Error: bad instruction `_asm_nokprobe(__get_user_8)'
>> arch/arm/lib/getuser.S:98: Error: bad instruction `_asm_nokprobe(__get_user_32t_8)'
>> arch/arm/lib/getuser.S:106: Error: bad instruction `_asm_nokprobe(__get_user_64t_1)'
>> arch/arm/lib/getuser.S:123: Error: bad instruction `_asm_nokprobe(__get_user_64t_2)'
>> arch/arm/lib/getuser.S:131: Error: bad instruction `_asm_nokprobe(__get_user_64t_4)'
arch/arm/lib/getuser.S:142: Error: bad instruction `_asm_nokprobe(__get_user_bad)'
arch/arm/lib/getuser.S:143: Error: bad instruction `_asm_nokprobe(__get_user_bad8)'

vim +98 arch/arm/lib/getuser.S

34
35 ENTRY(__get_user_1)
36 check_uaccess r0, 1, r1, r2, __get_user_bad
37 1: TUSER(ldrb) r2, [r0]
38 mov r0, #0
39 ret lr
40 ENDPROC(__get_user_1)
> 41 _ASM_NOKPROBE(__get_user_1)
42
43 ENTRY(__get_user_2)
44 check_uaccess r0, 2, r1, r2, __get_user_bad
45 #ifdef CONFIG_CPU_USE_DOMAINS
46 rb .req ip
47 2: ldrbt r2, [r0], #1
48 3: ldrbt rb, [r0], #0
49 #else
50 rb .req r0
51 2: ldrb r2, [r0]
52 3: ldrb rb, [r0, #1]
53 #endif
54 #ifndef __ARMEB__
55 orr r2, r2, rb, lsl #8
56 #else
57 orr r2, rb, r2, lsl #8
58 #endif
59 mov r0, #0
60 ret lr
61 ENDPROC(__get_user_2)
62 _ASM_NOKPROBE(__get_user_2)
63
64 ENTRY(__get_user_4)
65 check_uaccess r0, 4, r1, r2, __get_user_bad
66 4: TUSER(ldr) r2, [r0]
67 mov r0, #0
68 ret lr
69 ENDPROC(__get_user_4)
70 _ASM_NOKPROBE(__get_user_4)
71
72 ENTRY(__get_user_8)
73 check_uaccess r0, 8, r1, r2, __get_user_bad8
74 #ifdef CONFIG_THUMB2_KERNEL
75 5: TUSER(ldr) r2, [r0]
76 6: TUSER(ldr) r3, [r0, #4]
77 #else
78 5: TUSER(ldr) r2, [r0], #4
79 6: TUSER(ldr) r3, [r0]
80 #endif
81 mov r0, #0
82 ret lr
83 ENDPROC(__get_user_8)
84 _ASM_NOKPROBE(__get_user_8)
85
86 #ifdef __ARMEB__
87 ENTRY(__get_user_32t_8)
88 check_uaccess r0, 8, r1, r2, __get_user_bad
89 #ifdef CONFIG_CPU_USE_DOMAINS
90 add r0, r0, #4
91 7: ldrt r2, [r0]
92 #else
93 7: ldr r2, [r0, #4]
94 #endif
95 mov r0, #0
96 ret lr
97 ENDPROC(__get_user_32t_8)
> 98 _ASM_NOKPROBE(__get_user_32t_8)
99
100 ENTRY(__get_user_64t_1)
101 check_uaccess r0, 1, r1, r2, __get_user_bad8
102 8: TUSER(ldrb) r3, [r0]
103 mov r0, #0
104 ret lr
105 ENDPROC(__get_user_64t_1)
> 106 _ASM_NOKPROBE(__get_user_64t_1)
107
108 ENTRY(__get_user_64t_2)
109 check_uaccess r0, 2, r1, r2, __get_user_bad8
110 #ifdef CONFIG_CPU_USE_DOMAINS
111 rb .req ip
112 9: ldrbt r3, [r0], #1
113 10: ldrbt rb, [r0], #0
114 #else
115 rb .req r0
116 9: ldrb r3, [r0]
117 10: ldrb rb, [r0, #1]
118 #endif
119 orr r3, rb, r3, lsl #8
120 mov r0, #0
121 ret lr
122 ENDPROC(__get_user_64t_2)
> 123 _ASM_NOKPROBE(__get_user_64t_2)
124
125 ENTRY(__get_user_64t_4)
126 check_uaccess r0, 4, r1, r2, __get_user_bad8
127 11: TUSER(ldr) r3, [r0]
128 mov r0, #0
129 ret lr
130 ENDPROC(__get_user_64t_4)
> 131 _ASM_NOKPROBE(__get_user_64t_4)
132 #endif
133
134 __get_user_bad8:
135 mov r3, #0
136 __get_user_bad:
137 mov r2, #0
138 mov r0, #-EFAULT
139 ret lr
140 ENDPROC(__get_user_bad)
141 ENDPROC(__get_user_bad8)
142 _ASM_NOKPROBE(__get_user_bad)
143 _ASM_NOKPROBE(__get_user_bad8)
144

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