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dlopen.c
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dlopen.c
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/*
*
* @author : rrrfff@foxmail.com
* https://github.com/rrrfff/ndk_dlopen
*
*/
#include "dlopen.h"
#include <stdlib.h>
#include <limits.h>
#include <sys/mman.h>
#include <sys/system_properties.h>
#include <android/log.h>
#define LOG_TAG "ndk_dlopen"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
static volatile int SDK_INT = 0;
static void *quick_on_stack_back;
static union
{
void *generic_stub;
void *(*quick_on_stack_replace)(const void *param1, const void *param2,
const void *fake_trampoline, const void *called);
} STUBS;
void JNIEXPORT ndk_init(JNIEnv *env)
{
if (SDK_INT <= 0) {
char sdk[PROP_VALUE_MAX];
__system_property_get("ro.build.version.sdk", sdk);
SDK_INT = atoi(sdk);
LOGI("SDK_INT = %d", SDK_INT);
if (SDK_INT >= 24) {
static __attribute__((__aligned__(PAGE_SIZE))) uint8_t __insns[PAGE_SIZE];
STUBS.generic_stub = __insns;
mprotect(__insns, sizeof(__insns), PROT_READ | PROT_WRITE | PROT_EXEC);
// we are currently hijacking "FatalError" as a fake system-call trampoline
uintptr_t pv = (uintptr_t)(*env)->FatalError;
uintptr_t pu = (pv | (PAGE_SIZE - 1)) + 1u;
uintptr_t pd = (pv & ~(PAGE_SIZE - 1));
mprotect((void *)pd, pv + 8u >= pu ? PAGE_SIZE * 2u : PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC);
quick_on_stack_back = (void *)pv;
#if defined(__i386__)
/*
DEFINE_FUNCTION art_quick_on_stack_replace
movl 12(REG_VAR(esp)), REG_VAR(eax)
movl (REG_VAR(esp)), REG_VAR(edx)
movl REG_VAR(eax), (REG_VAR(esp))
movl REG_VAR(edx), 12(REG_VAR(esp))
pushl 16(REG_VAR(esp))
ret
END_FUNCTION art_quick_on_stack_replace
*/
memcpy(__insns, "\x8B\x44\x24\x0C\x8B\x14\x24\x89\x04\x24\x89\x54\x24\x0C\xFF\x74\x24\x10\xC3", 19);
/*
DEFINE_FUNCTION art_quick_on_stack_back
push 8(REG_VAR(esp))
ret
END_FUNCTION art_quick_on_stack_back
*/
memcpy(quick_on_stack_back, "\xC3\xFF\x74\x24\x08\xC3", 6);
quick_on_stack_back = (void *)(pv + 1); // inserts `ret` at first
#elif defined(__x86_64__)
// rdi, rsi, rdx, rcx, r8, r9
/*
0x0000000000000000: 52 push rdx
0x0000000000000001: 52 push rdx
0x0000000000000002: FF E1 jmp rcx
*/
memcpy(__insns, "\x52\x52\xFF\xE1", 4);
/*
0x0000000000000000: 5A pop rdx
0x0000000000000000: C3 ret
*/
memcpy(quick_on_stack_back, "\x5A\xC3", 2);
#elif defined(__aarch64__)
// x0~x7
/*
0x0000000000000000: FD 7B BF A9 stp x29, x30, [sp, #-0x10]!
0x0000000000000004: FD 03 00 91 mov x29, sp
0x0000000000000008: FE 03 02 AA mov x30, x2
0x000000000000000C: 60 00 1F D6 br x3
*/
memcpy(__insns, "\xFD\x7B\xBF\xA9\xFD\x03\x00\x91\xFE\x03\x02\xAA\x60\x00\x1F\xD6", 16);
/*
0x0000000000000000: FD 7B C1 A8 ldp x29, x30, [sp], #0x10
0x0000000000000004: C0 03 5F D6 ret
*/
memcpy(quick_on_stack_back, "\xFD\x7B\xC1\xA8\xC0\x03\x5F\xD6", 8);
#elif defined(__arm__)
// r0~r3
/*
0x0000000000000000: 08 E0 2D E5 str lr, [sp, #-8]!
0x0000000000000004: 02 E0 A0 E1 mov lr, r2
0x0000000000000008: 13 FF 2F E1 bx r3
*/
memcpy(__insns, "\x08\xE0\x2D\xE5\x02\xE0\xA0\xE1\x13\xFF\x2F\xE1", 12);
if ((pv & 1u) != 0u) { // Thumb
/*
0x0000000000000000: 0C BC pop {r2, r3}
0x0000000000000002: 10 47 bx r2
*/
memcpy((void *)(pv - 1), "\x0C\xBC\x10\x47", 4);
} else {
/*
0x0000000000000000: 0C 00 BD E8 pop {r2, r3}
0x0000000000000004: 12 FF 2F E1 bx r2
*/
memcpy(quick_on_stack_back, "\x0C\x00\xBD\xE8\x12\xFF\x2F\xE1", 8);
} //if
#else
# error "not supported"
#endif
LOGI("init done! quick_on_stack_replace = %p, quick_on_stack_back = %p",
STUBS.generic_stub, quick_on_stack_back);
} //if
} //if
}
void *JNIEXPORT ndk_dlopen(const char *filename, int flag)
{
if (SDK_INT >= 24) {
#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || defined(__arm__)
return STUBS.quick_on_stack_replace(filename, (void *)flag,
quick_on_stack_back, dlopen);
#else
# error "not supported"
#endif
} //if
return dlopen(filename, flag);
}
int JNIEXPORT ndk_dlclose(void *handle)
{
if (SDK_INT >= 24) {
#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || defined(__arm__)
return (int)STUBS.quick_on_stack_replace(handle, NULL,
quick_on_stack_back, dlclose);
#else
# error "not supported"
#endif
} //if
return dlclose(handle);
}
const char *JNIEXPORT ndk_dlerror(void)
{
if (SDK_INT >= 24) {
#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || defined(__arm__)
return STUBS.quick_on_stack_replace(NULL, NULL,
quick_on_stack_back, dlerror);
#else
# error "not supported"
#endif
} //if
return dlerror();
}
void *JNIEXPORT ndk_dlsym(void *handle, const char *symbol)
{
if (SDK_INT >= 24) {
#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || defined(__arm__)
return STUBS.quick_on_stack_replace(handle, symbol,
quick_on_stack_back, dlsym);
#else
# error "not supported"
#endif
} //if
return dlsym(handle, symbol);
}
int JNIEXPORT ndk_dladdr(const void *ddr, Dl_info *info)
{
if (SDK_INT >= 24) {
#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || defined(__arm__)
return (int)STUBS.quick_on_stack_replace(ddr, info,
quick_on_stack_back, dladdr);
#else
# error "not supported"
#endif
} //if
return dladdr(ddr, info);
}