kernel: add syscall dispatcher patching for x64

[5ec1cff]

• Patch syscall dispatcher on x64 to make tracepoint syscall redirection work
• Update documentation of x86_64 support and add translation by copilot

[5ec1cff]

@hmtheboy154 Would you mind testing this?

[hmtheboy154]

@hmtheboy154 Would you mind testing this?

will do. But I haven't setup LKM yet. This can still applied on GKI mode right ?

[5ec1cff]

will do. But I haven't setup LKM yet. This can still applied on GKI mode right ?

Yes

[Copilot]

Pull request overview

This PR introduces an optional x86_64-only mechanism to dynamically patch the hardened syscall dispatcher at runtime, aiming to keep KernelSU’s syscall hook working without requiring a kernel source patch (useful for LKM mode).

Changes:

• Add a new Kconfig option to enable dynamic patching of the x86_64 syscall dispatcher.
• Add a build flag for the option and implement runtime patching/restoration of x64_sys_call (and do_syscall_64 on older kernels).
• Relax an x86_64 init-time CPU feature check when the dynamic patching mode is enabled.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
kernel/Kconfig	Adds a new configuration option for x86_64 syscall-dispatcher patching.
kernel/Kbuild	Adds conditional compile flags for the new option.
kernel/hook/x86_64/syscall_hook.c	Implements patching/restoration logic for the x86_64 syscall dispatcher paths.
kernel/hook/patch_memory.h	Adjusts x86_64 includes used by the patching/hook code.
kernel/core/init.c	Skips the x86_64 INDIRECT_SAFE gate when dispatcher patching is enabled.

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