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kernel: support x86_64

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weishu
2022-12-12 13:51:09 +07:00
parent 304581cab4
commit 0d8785ec78
2 changed files with 67 additions and 7 deletions
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59
kernel/arch.h Normal file
View File

@@ -0,0 +1,59 @@
#ifndef __KSU_H_ARCH
#define __KSU_H_ARCH
#if defined(__aarch64__)
#define __PT_REGS_CAST(x) ((const struct user_pt_regs *)(x))
#define __PT_PARM1_REG regs[0]
#define __PT_PARM2_REG regs[1]
#define __PT_PARM3_REG regs[2]
#define __PT_PARM4_REG regs[3]
#define __PT_PARM5_REG regs[4]
#define __PT_RET_REG regs[30]
#define __PT_FP_REG regs[29] /* Works only with CONFIG_FRAME_POINTER */
#define __PT_RC_REG regs[0]
#define __PT_SP_REG sp
#define __PT_IP_REG pc
#define PRCTL_SYMBOL "__arm64_sys_prctl"
#elif defined(__x86_64__)
#define __PT_PARM1_REG di
#define __PT_PARM2_REG si
#define __PT_PARM3_REG dx
/* syscall uses r10 for PARM4 */
#define __PT_PARM4_REG r10
// #define __PT_PARM4_REG cx
#define __PT_PARM5_REG r8
#define __PT_RET_REG sp
#define __PT_FP_REG bp
#define __PT_RC_REG ax
#define __PT_SP_REG sp
#define __PT_IP_REG ip
#define PRCTL_SYMBOL "__x64_sys_prctl"
#else
#error "Unsupported arch"
#endif
/* allow some architecutres to override `struct pt_regs` */
#ifndef __PT_REGS_CAST
#define __PT_REGS_CAST(x) (x)
#endif
#define PT_REGS_PARM1(x) (__PT_REGS_CAST(x)->__PT_PARM1_REG)
#define PT_REGS_PARM2(x) (__PT_REGS_CAST(x)->__PT_PARM2_REG)
#define PT_REGS_PARM3(x) (__PT_REGS_CAST(x)->__PT_PARM3_REG)
#define PT_REGS_PARM4(x) (__PT_REGS_CAST(x)->__PT_PARM4_REG)
#define PT_REGS_PARM5(x) (__PT_REGS_CAST(x)->__PT_PARM5_REG)
#define PT_REGS_RET(x) (__PT_REGS_CAST(x)->__PT_RET_REG)
#define PT_REGS_FP(x) (__PT_REGS_CAST(x)->__PT_FP_REG)
#define PT_REGS_RC(x) (__PT_REGS_CAST(x)->__PT_RC_REG)
#define PT_REGS_SP(x) (__PT_REGS_CAST(x)->__PT_SP_REG)
#define PT_REGS_IP(x) (__PT_REGS_CAST(x)->__PT_IP_REG)
#endif

15
kernel/ksu.c
View File

@@ -23,6 +23,7 @@
#include "klog.h" #include "klog.h"
#include "apk_sign.h" #include "apk_sign.h"
#include "allowlist.h" #include "allowlist.h"
#include "arch.h"
#define KERNEL_SU_VERSION 3 #define KERNEL_SU_VERSION 3
@@ -149,12 +150,12 @@ static bool is_allow_su() {
static int handler_pre(struct kprobe *p, struct pt_regs *regs) { static int handler_pre(struct kprobe *p, struct pt_regs *regs) {
struct pt_regs* real_regs = (struct pt_regs*) regs->regs[0]; struct pt_regs* real_regs = (struct pt_regs*) PT_REGS_PARM1(regs);
int option = (int) real_regs->regs[0]; int option = (int) PT_REGS_PARM1(real_regs);
unsigned long arg2 = (unsigned long) real_regs->regs[1]; unsigned long arg2 = (unsigned long) PT_REGS_PARM2(real_regs);
unsigned long arg3 = (unsigned long) real_regs->regs[2]; unsigned long arg3 = (unsigned long) PT_REGS_PARM3(real_regs);
unsigned long arg4 = (unsigned long) real_regs->regs[3]; unsigned long arg4 = (unsigned long) PT_REGS_PARM4(real_regs);
unsigned long arg5 = (unsigned long) real_regs->regs[4]; unsigned long arg5 = (unsigned long) PT_REGS_PARM5(real_regs);
// if success, we modify the arg5 as result! // if success, we modify the arg5 as result!
u32* result = (u32*) arg5; u32* result = (u32*) arg5;
@@ -221,7 +222,7 @@ static int handler_pre(struct kprobe *p, struct pt_regs *regs) {
} }
static struct kprobe kp = { static struct kprobe kp = {
.symbol_name = "__arm64_sys_prctl", .symbol_name = PRCTL_SYMBOL,
.pre_handler = handler_pre, .pre_handler = handler_pre,
}; };