Support for PTRACE_GET_SYSCALL_INFO

[ItsShadowCone]

Linux >= 5.3 supports ptrace(PTRACE_GET_SYSCALL_INFO, pid, sizeof(struct ptrace_syscall_info), &info) to obtain more information about a syscall stop. Do note that it apparently only works, if PTRACE_O_TRACESYSGOOD is set beforehand.

Happy to contribute too.

FreeBSD seems to support this too, but I don't have a system to test that on.

[asomers]

Go ahead and submit a PR. CI will check it for FreeBSD, or I can.

[emilengler]

Any updates on this? I could spend some hours (at least for the Linux support) on this, as we need a CPU portable way to achieve syscall interception.

[emilengler]

See #2006