Messages in this thread | | | Date | Wed, 23 Sep 2020 12:30:08 +0200 | From | Borislav Petkov <> | Subject | Re: invalid opcode in map_vdso |
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On Wed, Sep 23, 2020 at 11:19:40AM +0200, Dmitry Vyukov wrote: > +clang-built-linux > Looks like another one with kernel code overwrite in clang build.
Uuh, that's a nice and refreshing one - the pattern is not zeroes this time
Code: 16 48 89 ef 48 8b 34 24 31 c9 e8 88 7c a7 00 eb 7a 4c 8b 74 24 28 43 80 3c 3e 00 48 8b 5c 24 08 74 08 4c 89 ef e8 4d 77 70 70 <07> 20 05 00 00 49 03 6d 00 48 89 e8 48 c1 e8 03 42 80 3c 38 00 74 All code ======== 0: 16 (bad) 1: 48 89 ef mov %rbp,%rdi 4: 48 8b 34 24 mov (%rsp),%rsi 8: 31 c9 xor %ecx,%ecx a: e8 88 7c a7 00 callq 0xa77c97 f: eb 7a jmp 0x8b 11: 4c 8b 74 24 28 mov 0x28(%rsp),%r14 16: 43 80 3c 3e 00 cmpb $0x0,(%r14,%r15,1) 1b: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx 20: 74 08 je 0x2a 22: 4c 89 ef mov %r13,%rdi 25: e8 4d 77 70 70 callq 0x70707777 2a:* 07 (bad) <-- trapping instruction 2b: 20 05 00 00 49 03 and %al,0x3490000(%rip) # 0x3490031 31: 6d insl (%dx),%es:(%rdi) 32: 00 48 89 add %cl,-0x77(%rax) 35: e8 48 c1 e8 03 callq 0x3e8c182 3a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 3f: 74 .byte 0x74
Code starting with the faulting instruction =========================================== 0: 07 (bad) 1: 20 05 00 00 49 03 and %al,0x3490000(%rip) # 0x3490007 7: 6d insl (%dx),%es:(%rdi) 8: 00 48 89 add %cl,-0x77(%rax) b: e8 48 c1 e8 03 callq 0x3e8c158 10: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 15: 74 .byte 0x74
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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