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#ifdef __APPLE__
#include "substitute.h"
#include "substitute-internal.h"
#include <mach/mach.h>
#include <sys/param.h>
#include <stdint.h>
#include <stdio.h>
#include <stdbool.h>
kern_return_t mach_vm_read_overwrite(vm_map_t, mach_vm_address_t, mach_vm_size_t, mach_vm_address_t, mach_vm_size_t *);
#define DEFINE_STRUCTS
#define dyld_image_infos_fields(ptr) \
uint32_t version; \
uint32_t infoArrayCount; \
ptr infoArray; \
ptr notification; \
bool processDetachedFromSharedRegion; \
bool libSystemInitialized; \
ptr dyldImageLoadAddress; \
ptr jitInfo; \
ptr dyldVersion; \
ptr errorMessage; \
ptr terminationFlags; \
ptr coreSymbolicationShmPage; \
ptr systemOrderFlag; \
ptr uuidArrayCount; \
ptr uuidArray; \
ptr dyldAllImageInfosAddress; \
ptr initialImageCount; \
ptr errorKind; \
ptr errorClientOfDylibPath; \
ptr errorTargetDylibPath; \
ptr errorSymbol; \
ptr sharedCacheSlide; \
uint8_t sharedCacheUUID[16]; \
ptr reserved[16];
struct dyld_all_image_infos_32 {
dyld_image_infos_fields(uint32_t)
};
struct dyld_all_image_infos_64 {
dyld_image_infos_fields(uint64_t)
};
static int find_libs_in_task(mach_port_t task, uint64_t *dyld_addr_p,
uint64_t *libpthread_p, char **error) {
struct task_dyld_info tdi;
mach_msg_type_number_t cnt = TASK_DYLD_INFO_COUNT;
kern_return_t kr = task_info(task, TASK_DYLD_INFO, (void *) &tdi, &cnt);
if (kr || cnt != TASK_DYLD_INFO_COUNT) {
asprintf(error, "task_info(TASK_DYLD_INFO): kr=%d", kr);
return SUBSTITUTE_ERR_MISC;
}
if (!tdi.all_image_info_addr || !tdi.all_image_info_size ||
tdi.all_image_info_size > 1024 ||
tdi.all_image_info_format > TASK_DYLD_ALL_IMAGE_INFO_64) {
asprintf(error, "TASK_DYLD_INFO obviously malformed");
return SUBSTITUTE_ERR_MISC;
}
char all_image_infos_buf[1024];
cnt = tdi.all_image_info_size;
mach_vm_size_t size = tdi.all_image_info_size;
kr = mach_vm_read_overwrite(task, tdi.all_image_info_addr, tdi.all_image_info_size,
(mach_vm_address_t) all_image_infos_buf, &size);
if (kr || size != tdi.all_image_info_size) {
asprintf(error, "mach_vm_read_overwrite(all_image_info): kr=%d", kr);
return SUBSTITUTE_ERR_MISC;
}
bool is64 = tdi.all_image_info_format = TASK_DYLD_ALL_IMAGE_INFO_64;
const struct dyld_all_image_infos_32 *aii32 = (void *) all_image_infos_buf;
const struct dyld_all_image_infos_64 *aii64 = (void *) all_image_infos_buf;
#define FIELD(f) (is64 ? aii64->f : aii32->f)
if (FIELD(version) < 2) {
/* apparently we're on Leopard or something */
asprintf(error, "dyld_all_image_infos version too low");
return SUBSTITUTE_ERR_MISC;
}
*dyld_addr_p = FIELD(dyldImageLoadAddress);
uint64_t info_array_addr = FIELD(infoArray);
uint32_t info_array_count = FIELD(infoArrayCount);
size_t info_array_elm_size = (is64 ? sizeof(uint64_t) : sizeof(uint32_t)) * 3;
#undef FIELD
if (info_array_count > 2000) {
asprintf(error, "unreasonable number of loaded libraries: %u", info_array_count);
return SUBSTITUTE_ERR_MISC;
}
size_t info_array_size = info_array_count * info_array_elm_size;
void *info_array = malloc(info_array_count * info_array_elm_size);
if (!info_array)
return SUBSTITUTE_ERR_OOM;
kr = mach_vm_read_overwrite(task, info_array_addr, info_array_size,
(mach_vm_address_t) info_array, &size);
if (kr || size != info_array_size) {
asprintf(error, "mach_vm_read_overwrite(info_array): kr=%d", kr);
return SUBSTITUTE_ERR_MISC;
}
/* yay, slow file path reads! */
void *info_array_ptr = info_array;
for (uint32_t i = 0; i < info_array_count; i++) {
uint64_t load_address;
uint64_t file_path;
if (is64) {
uint64_t *e = info_array_ptr;
load_address = e[0];
file_path = e[1];
} else {
uint32_t *e = info_array_ptr;
load_address = e[0];
file_path = e[1];
}
/* mach_vm_read_overwrite won't do partial copies, so... */
char path_buf[MAXPATHLEN+1];
size_t toread = MIN(MAXPATHLEN, -file_path & 0xfff);
path_buf[toread] = '\0';
kr = mach_vm_read_overwrite(task, (mach_vm_address_t) path_buf, toread,
load_address, &size);
if (kr) {
continue;
}
if (strlen(path_buf) == toread && toread < MAXPATHLEN) {
/* get the rest... */
kr = mach_vm_read_overwrite(task, (mach_vm_address_t) path_buf + toread,
MAXPATHLEN - toread, load_address + toread,
&size);
if (kr) {
continue;
}
path_buf[MAXPATHLEN] = '\0';
}
if (!strcmp(path_buf, "/usr/lib/libpthread.dylib")) {
*libpthread_p = load_address;
return 0;
}
info_array_ptr += info_array_elm_size;
}
asprintf(error, "couldn't find libpthread");
return SUBSTITUTE_ERR_MISC;
}
EXPORT
int substitute_dlopen_in_pid(int pid, const char *filename, int options, char **error) {
mach_port_t task;
*error = NULL;
kern_return_t kr = task_for_pid(mach_task_self(), pid, &task);
int ret;
if (kr) {
asprintf(error, "task_for_pid: kr=%d", kr);
return SUBSTITUTE_ERR_TASK_FOR_PID;
}
uint64_t dyld_addr, libpthread_addr;
if ((ret = find_libs_in_task(task, &dyld_addr, &libpthread_addr, error)))
goto fail;
(void) filename;
(void) options;
printf("%p %p\n", (void *) dyld_addr, (void *) libpthread_addr);
ret = 0;
fail:
mach_port_deallocate(mach_task_self(), task);
return ret;
}
#endif /* __APPLE__ */
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