shadowhook_dlsym找不到，而使用系统的dlsym可以找到

[9c-x]

ShadowHook Version

1.0.10

Android OS Version

13

Android ABIs

arm64-v8a

Device Manufacturers and Models

小米11，Android 13 ，api 33

Describe the Bug

使用下面方式找不到
void *handle = shadowhook_dlopen("libc.so");
void *original = shadowhook_dlsym(handle, "android_dlopen_ext");
而使用下面系统方式能够找到
void *handle = dlopen("libc.so", RTLD_NOW);
void *original = dlsym(handle, "android_dlopen_ext");

[caikelun]

@9c-x

void *handle = shadowhook_dlopen("libdl.so");
void *original = shadowhook_dlsym(handle, "android_dlopen_ext");

[9c-x]

@9c-x

void *handle = shadowhook_dlopen("libdl.so");
void *original = shadowhook_dlsym(handle, "android_dlopen_ext");

请问一下这个libdl.so是如何确定的？具体原因能够解释一下吗，感谢

[caikelun]

@9c-x

void *handle = shadowhook_dlopen("libdl.so");
void *original = shadowhook_dlsym(handle, "android_dlopen_ext");

请问一下这个libdl.so是如何确定的？具体原因能够解释一下吗，感谢

android_dlopen_ext的实现在libdl.so中: https://cs.android.com/android/platform/superproject/main/+/main:bionic/libdl/libdl.cpp;l=135

另外：

llvm-readelf -sW ~/Documents/libdl.so 

Symbol table '.dynsym' contains 28 entries:
   Num:    Value          Size Type    Bind   Vis       Ndx Name
     0: 0000000000000000     0 NOTYPE  LOCAL  DEFAULT   UND 
     1: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_android_get_LD_LIBRARY_PATH
     2: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_dlopen
     3: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_dlerror
     4: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_dlsym
     5: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_dlvsym
     6: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_dladdr
     7: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_dlclose
     8: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_dl_iterate_phdr
     9: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_android_dlopen_ext
    10: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_android_get_application_target_sdk_version
    11: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_android_handle_signal
    12: 0000000000000000     0 FUNC    WEAK   DEFAULT   UND __loader_cfi_fail
    13: 0000000000001060    28 FUNC    WEAK   DEFAULT    10 dlsym@@LIBC
    14: 0000000000001080    28 FUNC    WEAK   DEFAULT    10 dlvsym@@LIBC_N
    15: 00000000000010c0    20 FUNC    WEAK   DEFAULT    10 dlclose@@LIBC
    16: 0000000000001120    20 FUNC    WEAK   DEFAULT    10 android_get_application_target_sdk_version@@LIBC_N
    17: 0000000000001000    20 FUNC    WEAK   DEFAULT    10 android_get_LD_LIBRARY_PATH@@LIBC_PLATFORM
    18: 0000000000001020    28 FUNC    WEAK   DEFAULT    10 dlopen@@LIBC
    19: 0000000000001040    20 FUNC    WEAK   DEFAULT    10 dlerror@@LIBC
    20: 00000000000010e0    20 FUNC    WEAK   DEFAULT    10 dl_iterate_phdr@@LIBC
    21: 00000000000010a0    20 FUNC    WEAK   DEFAULT    10 dladdr@@LIBC
    22: 0000000000001100    28 FUNC    WEAK   DEFAULT    10 android_dlopen_ext@@LIBC
    23: 0000000000001140    24 FUNC    WEAK   DEFAULT    10 android_handle_signal@@LIBC_PLATFORM
    24: 0000000000001160    24 FUNC    GLOBAL DEFAULT    10 __cfi_init@@LIBC_PLATFORM
    25: 0000000000001180    24 FUNC    GLOBAL DEFAULT    10 __cfi_shadow_size@@LIBC_OMR1
    26: 00000000000011a0   108 FUNC    GLOBAL DEFAULT    10 __cfi_slowpath@@LIBC_OMR1
    27: 0000000000001210   100 FUNC    GLOBAL DEFAULT    10 __cfi_slowpath_diag@@LIBC_OMR1

Ndx不为UND(0)表示这是一个导出符号，符号对应的机器码在当前ELF中。