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[3.12] gh-128605: Add branch protections for x86_64 in asm_trampoline.S (#128606) Apply Intel Control-flow Technology for x86-64 on asm_trampoline.S. Required for mitigation against return-oriented programming (ROP) and Call or Jump Oriented Programming (COP/JOP) attacks. Manual application is required for the assembly files. See also: https://sourceware.org/annobin/annobin.html/Test-cf-protection.html
50 lines
1.2 KiB
ArmAsm
50 lines
1.2 KiB
ArmAsm
.text
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.globl _Py_trampoline_func_start
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# The following assembly is equivalent to:
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# PyObject *
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# trampoline(PyThreadState *ts, _PyInterpreterFrame *f,
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# int throwflag, py_evaluator evaluator)
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# {
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# return evaluator(ts, f, throwflag);
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# }
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_Py_trampoline_func_start:
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#ifdef __x86_64__
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#if defined(__CET__) && (__CET__ & 1)
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endbr64
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#endif
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sub $8, %rsp
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call *%rcx
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add $8, %rsp
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ret
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#endif // __x86_64__
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#if defined(__aarch64__) && defined(__AARCH64EL__) && !defined(__ILP32__)
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// ARM64 little endian, 64bit ABI
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// generate with aarch64-linux-gnu-gcc 12.1
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stp x29, x30, [sp, -16]!
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mov x29, sp
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blr x3
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ldp x29, x30, [sp], 16
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ret
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#endif
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.globl _Py_trampoline_func_end
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_Py_trampoline_func_end:
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.section .note.GNU-stack,"",@progbits
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# Note for indicating the assembly code supports CET
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#if defined(__x86_64__) && defined(__CET__) && (__CET__ & 1)
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.section .note.gnu.property,"a"
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.align 8
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.long 1f - 0f
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.long 4f - 1f
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.long 5
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0:
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.string "GNU"
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1:
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.align 8
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.long 0xc0000002
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.long 3f - 2f
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2:
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.long 0x3
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3:
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.align 8
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4:
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#endif // __x86_64__
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