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老师你好,我正在Inlinehook多个so中相同的符号(函数),我使用xdl_iterate_phdr遍历当前加载的so,并进行过滤,在回调函数中,拿到lib_name后,我需要获取handle才能查找符号地址。这里有个问题是,不管我调用xdl_open还是dlopen似乎都会导致crash。因为xdl_open内部也会调用xdl_iterate_phdr来遍历库比较,这导致xdl_iterate_phdr似乎重入了,由于xdl_iterate_phdr最终调用的是安卓的dl_iterate_phdr函数,而这些dl函数内部有mutex锁,会导致死锁,我无法实现我想做的事情。 也许可以通过xdl_open拿handle的方法(在xdl_iterate_phdr的回调函数里做同样的事情):
// found the target ELF if (NULL == ((*self) = calloc(1, sizeof(xdl_t)))) return 1; // return failed if (NULL == ((*self)->pathname = strdup((const char *)info->dlpi_name))) { free(*self); *self = NULL; return 1; // return failed } (*self)->load_bias = info->dlpi_addr; (*self)->dlpi_phdr = info->dlpi_phdr; (*self)->dlpi_phnum = info->dlpi_phnum; (*self)->dynsym_try_load = false; (*self)->symtab_try_load = false; return 1; // return OK
这里可以在自己的回调函数里同样的实现,创建一个xdl_t对象,info信息传给xdl_t对象,把对象地址传给xdl_sym应该也行
或者还有其他方式吗?如果xdl_iterate_phdr也能传递xdl handle到回调函数就好了
The text was updated successfully, but these errors were encountered:
你好,
从性能角度出发,你的需求应该加一个函数:void *xdl_open2(struct dl_phdr_info *info) ,通过 xdl_iterate_phdr 返回的系统 struct dl_phdr_info 类型来创建 xdl handle。逻辑大概就是你写的这些,我觉得应该没啥问题。如果需要这样的 API 我可以加一个,你也可以自己改改先用着。
void *xdl_open2(struct dl_phdr_info *info)
xdl_iterate_phdr
struct dl_phdr_info
如果不考虑性能,也可以把 xdl_iterate_phdr 遍历时获取到的 struct dl_phdr_info 都先在内存中保存下来,等 xdl_iterate_phdr 返回后,再去逐个调用 xdl_open。这样性能肯定比较差。
xdl_open
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老师你好,我正在Inlinehook多个so中相同的符号(函数),我使用xdl_iterate_phdr遍历当前加载的so,并进行过滤,在回调函数中,拿到lib_name后,我需要获取handle才能查找符号地址。这里有个问题是,不管我调用xdl_open还是dlopen似乎都会导致crash。因为xdl_open内部也会调用xdl_iterate_phdr来遍历库比较,这导致xdl_iterate_phdr似乎重入了,由于xdl_iterate_phdr最终调用的是安卓的dl_iterate_phdr函数,而这些dl函数内部有mutex锁,会导致死锁,我无法实现我想做的事情。
也许可以通过xdl_open拿handle的方法(在xdl_iterate_phdr的回调函数里做同样的事情):
这里可以在自己的回调函数里同样的实现,创建一个xdl_t对象,info信息传给xdl_t对象,把对象地址传给xdl_sym应该也行
或者还有其他方式吗?如果xdl_iterate_phdr也能传递xdl handle到回调函数就好了
The text was updated successfully, but these errors were encountered: