<p></p>
On Sun, Jan 23, 2022 at 02:49:27AM -0800, Huacai Chen wrote:<br>
> I'm sorry that we still have to export orig_a0, because the current solution cannot let ptrace to modify arg0 and return value at the same time.<br>
<br>
What ptracers usually do is tampering with the syscall number and/or its<br>
arguments on entering syscall and tampering with the return value on<br>
exiting syscall.  Tampering with the return value on entering syscall<br>
is not reliable as it is not supported by all linux architectures.<br>
<br>
That is, I don't see why the change is necessary.<br>


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