docs: zh: Introduce tracepoint hook documents (#350)
* docs: Introduce tracepoint hook documents Still working in progress... Only zh-cn. * fix broken link * format * 更新 tracepoint-hook.md * format * 更新 tracepoint-hook.md * docs: zh: fmt Signed-off-by: WenHao2130 <wenhao2130@outlook.com> --------- Signed-off-by: WenHao2130 <wenhao2130@outlook.com> Co-authored-by: WenHao2130 <wenhao2130@outlook.com>
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@@ -21,9 +21,15 @@ SukiSU 可以集成到 GKI 和 non-GKI 内核中，并且已反向移植到 4.14
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<!-- - backslashxx's syscall manual hook: https://github.com/backslashxx/KernelSU/issues/5 (v1.5 version is not available at the moment, if you want to use it, please use v1.4 version, or standard KernelSU hooks)-->
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- 需要 `CONFIG_KSU_MANUAL_HOOK=y`
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- 需要 [`guide/how-to-integrate.md`](guide/how-to-integrate.md)
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- 需要 [`guide/how-to-integrate.md`](how-to-integrate.md)
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- 需要 [https://github.com/~](https://github.com/tiann/KernelSU/blob/main/website/docs/guide/how-to-integrate-for-non-gki.md#manually-modify-the-kernel-source)
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3. **Tracepoint Hook:**
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- 自 SukiSU commit [49b01aad](https://github.com/SukiSU-Ultra/SukiSU-Ultra/commit/49b01aad74bcca6dba5a8a2e053bb54b648eb124) 引入的 hook 方法
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- 需要 `CONFIG_KSU_TRACEPOINT_HOOK=y`
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- 需要 [`guide/tracepoint-hook.md`](tracepoint-hook.md)
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<!-- This part refer to [rsuntk/KernelSU](https://github.com/rsuntk/KernelSU). -->
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如果您能够构建可启动内核，有两种方法可以将 KernelSU 集成到内核源代码中：
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270
docs/zh/guide/tracepoint-hook.md
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270
docs/zh/guide/tracepoint-hook.md
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@@ -0,0 +1,270 @@
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# Tracepoint Hook 集成
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## 介绍
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自 commit [49b01aad](https://github.com/SukiSU-Ultra/SukiSU-Ultra/commit/49b01aad74bcca6dba5a8a2e053bb54b648eb124) 起，SukiSU 引入了 Tracepoint Hook
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该 Hook 理论上相比于 Kprobes Hook，性能开销更小，但次于 Manual Hook / Syscall Hook
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> [!NOTE]
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> 本教程参考了 [backslashxx/KernelSU#5](https://github.com/backslashxx/KernelSU/issues/5) 的 syscall hook v1.4 版本钩子，以及原版 KernelSU 的 [Manual Hook](https://kernelsu.org/guide/how-to-integrate-for-non-gki.html#manually-modify-the-kernel-source)
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## Guide
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### execve 钩子（`exec.c`）
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一般需要修改 `fs/exec.c` 的 `do_execve` 和 `compat_do_execve` 方法
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```patch
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--- a/fs/exec.c
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+++ b/fs/exec.c
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@@ -78,6 +78,10 @@
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#include <trace/hooks/sched.h>
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#endif
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+#include <../drivers/kernelsu/ksu_trace.h>
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+#endif
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+
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EXPORT_TRACEPOINT_SYMBOL_GPL(task_rename);
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static int bprm_creds_from_file(struct linux_binprm *bprm);
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@@ -2037,6 +2041,9 @@ static int do_execve(struct filename *filename,
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{
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struct user_arg_ptr argv = { .ptr.native = __argv };
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struct user_arg_ptr envp = { .ptr.native = __envp };
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+ trace_ksu_trace_execveat_hook((int *)AT_FDCWD, &filename, &argv, &envp, 0);
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+#endif
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return do_execveat_common(AT_FDCWD, filename, argv, envp, 0);
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}
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@@ -2064,6 +2071,9 @@ static int compat_do_execve(struct filename *filename,
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.is_compat = true,
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.ptr.compat = __envp,
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};
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+ trace_ksu_trace_execveat_sucompat_hook((int *)AT_FDCWD, &filename, NULL, NULL, NULL); /* 32-bit su */
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+#endif
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return do_execveat_common(AT_FDCWD, filename, argv, envp, 0);
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}
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```
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### faccessat 钩子 (`open.c`)
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一般需要修改 `/fs/open.c` 的 `do_faccessat` 方法
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```patch
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--- a/fs/open.c
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+++ b/fs/open.c
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@@ -37,6 +37,10 @@
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#include "internal.h"
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#include <trace/hooks/syscall_check.h>
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+#include <../drivers/kernelsu/ksu_trace.h>
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+#endif
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+
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int do_truncate(struct user_namespace *mnt_userns, struct dentry *dentry,
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loff_t length, unsigned int time_attrs, struct file *filp)
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{
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@@ -468,6 +472,9 @@ static long do_faccessat(int dfd, const char __user *filename, int mode, int fla
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SYSCALL_DEFINE3(faccessat, int, dfd, const char __user *, filename, int, mode)
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{
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+ trace_ksu_trace_faccessat_hook(&dfd, &filename, &mode, NULL);
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+#endif
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return do_faccessat(dfd, filename, mode, 0);
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}
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```
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如果没有 `do_faccessat` 方法，可以找 `faccessat` 的 SYSCALL 定义（对于早于 4.17 的内核）
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```patch
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--- a/fs/open.c
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+++ b/fs/open.c
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@@ -31,6 +31,9 @@
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#include <linux/ima.h>
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#include <linux/dnotify.h>
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#include <linux/compat.h>
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+#include <../drivers/kernelsu/ksu_trace.h>
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+#endif
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#include "internal.h"
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@@ -369,6 +372,9 @@ SYSCALL_DEFINE3(faccessat, int, dfd, const char __user *, filename, int, mode)
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int res;
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unsigned int lookup_flags = LOOKUP_FOLLOW;
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+ trace_ksu_trace_faccessat_hook(&dfd, &filename, &mode, NULL);
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+#endif
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if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */
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return -EINVAL;
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```
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### sys_read 钩子 ( `read_write.c` )
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需要修改 `fs/read_write.c` 的 `sys_read` 方法（4.19 及以上）
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```patch
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--- a/fs/read_write.c
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+++ b/fs/read_write.c
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@@ -25,6 +25,10 @@
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+#include <../drivers/kernelsu/ksu_trace.h>
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+#endif
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+
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const struct file_operations generic_ro_fops = {
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.llseek = generic_file_llseek,
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.read_iter = generic_file_read_iter,
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@@ -630,6 +634,9 @@ ssize_t ksys_read(unsigned int fd, char __user *buf, size_t count)
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SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
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{
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+ trace_ksu_trace_sys_read_hook(fd, &buf, &count);
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+#endif
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return ksys_read(fd, buf, count);
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}
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```
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或者是 `read` 的 SYSCALL 定义（4.14 及以下）
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```patch
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--- a/fs/read_write.c
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+++ b/fs/read_write.c
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@@ -25,6 +25,11 @@
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+#include <../drivers/kernelsu/ksu_trace.h>
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+#endif
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+
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+
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const struct file_operations generic_ro_fops = {
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.llseek = generic_file_llseek,
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.read_iter = generic_file_read_iter,
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@@ -575,6 +580,9 @@ SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
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if (f.file) {
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loff_t pos = file_pos_read(f.file);
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+ trace_ksu_trace_sys_read_hook(fd, &buf, &count);
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+#endif
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ret = vfs_read(f.file, buf, count, &pos);
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if (ret >= 0)
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file_pos_write(f.file, pos);
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```
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### fstatat 钩子 ( `stat.c` )
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需要修改 `stat.c` 的 `newfstatat` SYSCALL 定义
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如果需要 32 位支持，还需要修改 `statat64` SYSCALL 定义
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```patch
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--- a/fs/stat.c
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+++ b/fs/stat.c
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@@ -24,6 +24,10 @@
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#include "internal.h"
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#include "mount.h"
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+#include <../drivers/kernelsu/ksu_trace.h>
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+#endif
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+
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/**
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* generic_fillattr - Fill in the basic attributes from the inode struct
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* @mnt_userns: user namespace of the mount the inode was found from
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@@ -408,6 +412,10 @@ SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
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struct kstat stat;
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int error;
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+ trace_ksu_trace_stat_hook(&dfd, &filename, &flag);
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+#endif
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+
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error = vfs_fstatat(dfd, filename, &stat, flag);
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if (error)
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return error;
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@@ -559,6 +567,10 @@ SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
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struct kstat stat;
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int error;
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+ trace_ksu_trace_stat_hook(&dfd, &filename, &flag); /* 32-bit su support */
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+#endif
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+
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error = vfs_fstatat(dfd, filename, &stat, flag);
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if (error)
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return error;
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```
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### input 钩子 (`input.c` ,用于进入KSU系的内置安全模式)
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需要修改 `drivers/input/input.c` 的 `input_event` 方法，而不是 `input_handle_event`
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```patch
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--- a/drivers/input/input.c
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+++ b/drivers/input/input.c
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@@ -26,6 +26,10 @@
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#include "input-compat.h"
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#include "input-poller.h"
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+#include <../../drivers/kernelsu/ksu_trace.h>
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+#endif
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+
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
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MODULE_DESCRIPTION("Input core");
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MODULE_LICENSE("GPL");
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@@ -451,6 +455,10 @@ void input_event(struct input_dev *dev,
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{
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unsigned long flags;
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+ trace_ksu_trace_input_hook(&type, &code, &value);
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+#endif
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+
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if (is_event_supported(type, dev->evbit, EV_MAX)) {
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spin_lock_irqsave(&dev->event_lock, flags);
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```
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### devpts 钩子 (`pty.c`)
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需要修改 `drivers/tty/pty.c` 的 `pts_unix98_lookup` 方法
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```patch
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--- a/drivers/tty/pty.c
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+++ b/drivers/tty/pty.c
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@@ -31,6 +31,10 @@
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#include <linux/compat.h>
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#include "tty.h"
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+#include <../../drivers/kernelsu/ksu_trace.h>
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+#endif
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+
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#undef TTY_DEBUG_HANGUP
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#ifdef TTY_DEBUG_HANGUP
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# define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args)
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@@ -707,6 +711,10 @@ static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
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{
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struct tty_struct *tty;
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+#if defined(CONFIG_KSU) && defined(CONFIG_KSU_TRACEPOINT_HOOK)
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+ trace_ksu_trace_devpts_hook((struct inode *)file->f_path.dentry->d_inode);
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+#endif
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+
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mutex_lock(&devpts_mutex);
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tty = devpts_get_priv(file->f_path.dentry);
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mutex_unlock(&devpts_mutex);
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```
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