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36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
#ifndef PTRAUTH_HELPERS_H
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#define PTRAUTH_HELPERS_H
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// Helpers for PAC archs.
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// https://gist.github.com/summertriangle-dev/6b0449ce561f756ac82a4bc3de7af30a
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// If the compiler understands __arm64e__, assume it's paired with an SDK that has
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// ptrauth.h. Otherwise, it'll probably error if we try to include it so don't.
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#if __arm64e__
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#include <ptrauth.h>
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#endif
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wunused-function"
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// Given a pointer to instructions, sign it so you can call it like a normal fptr.
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static void *make_sym_callable(void *ptr) {
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#if __arm64e__
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if (ptr == NULL)
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return NULL;
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ptr = ptrauth_sign_unauthenticated(ptrauth_strip(ptr, ptrauth_key_function_pointer), ptrauth_key_function_pointer, 0);
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#endif
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return ptr;
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}
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// Given a function pointer, strip the PAC so you can read the instructions.
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static void *make_sym_readable(void *ptr) {
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#if __arm64e__
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if (ptr == NULL)
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return NULL;
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ptr = ptrauth_strip(ptr, ptrauth_key_function_pointer);
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#endif
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return ptr;
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}
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#pragma clang diagnostic pop
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#endif |