Proteas

void inject_trusts(int pathc, const char *paths[])
{
    printf("[+] injecting into trust cache...\n");
    
    extern uint64_t g_kern_base;
    
    static uint64_t tc = 0;
    if (tc == 0) {
        /* loaded_trust_caches
         iPhone11,2-4-6: 0xFFFFFFF008F702C8

Proteas

//
//  PoC.m
//  IOSABugTrigger
//
//  Created by Linus Henze on 2023-04-08.
//  Copyright © 2023 Pinauten GmbH. Some rights reserved.
//

//
// This is a PoC for CVE-2023-28206, triggering an oob memmove in IosaColorManagerMSR8::getHDRStats_gatedContext

Proteas

data source

• https://github.com/Proteas/kalloc-type/blob/main/iOS-v16.0-20A5283p-iPhone14%2C2-kalloc-type-view.json

type count: 194

    size: 168, name: AFKEndpointInterface_DescriptorBase
    size: 168, name: AGXPerfCtrSampler
    size: 168, name: AVE_DRC
    size: 168, name: AppleAOPAudioAmpManagerDevice
    size: 168, name: AppleAOPAudioButtonOutputDevice
    size: 168, name: AppleAOPAudioDevice

Proteas

iOS-v12.0-16A366-iPhone11,6

instructions about setting pac key

__text:FFFFFFF007A0834C                 LDR             X0, =0xFEEDFACEFEEDFACF ; LDR X0, #348, 0xFFFFFFF007A084A8
__text:FFFFFFF007A08350                 MSR             #0, c2, c1, #2, X0 ; APIBKeyLo_EL1
__text:FFFFFFF007A08354                 MSR             #0, c2, c1, #3, X0 ; APIBKeyHi_EL1
__text:FFFFFFF007A08358                 ADD             X0, X0, #1
__text:FFFFFFF007A0835C                 MSR             #0, c2, c2, #2, X0 ; APDBKeyLo_EL1
__text:FFFFFFF007A08360                 MSR             #0, c2, c2, #3, X0 ; APDBKeyHi_EL1

Proteas

MSC__kernelrpc_mach_vm_allocate_trap
MSC__kernelrpc_mach_vm_purgable_control_trap
MSC__kernelrpc_mach_vm_deallocate_trap
MSC__kernelrpc_mach_vm_protect_trap
MSC__kernelrpc_mach_vm_map_trap
MSC__kernelrpc_mach_port_allocate_trap
MSC__kernelrpc_mach_port_deallocate_trap
MSC__kernelrpc_mach_port_mod_refs_trap
MSC__kernelrpc_mach_port_insert_right_trap
MSC__kernelrpc_mach_port_insert_member_trap

Proteas

kernel

• xnu-8020.140.20.0.4~14

My Conclusion

1. kernel heap hardening: tag, type hash
   • kmem_alloc_guard
   • kmem_apply_security_policy
2. codesign, protecting the members with DA Key
   • csfg_get_*

Proteas

Here's a list of mildly interesting things about the C language that I learned mostly by consuming Clang's ASTs. Although surprises are getting sparser, I might continue to update this document over time.

There are many more mildly interesting features of C++, but the language is literally known for being weird, whereas C is usually considered smaller and simpler, so this is (almost) only about C.

1. Combined type and variable/field declaration, inside a struct scope [https://godbolt.org/g/Rh94Go]

struct foo {
   struct bar {
 int x;

Proteas

/usr/libexec/backboardd
/usr/sbin/mediaserverd
/System/Library/Frameworks/WebKit.framework/XPCServices/com.apple.WebKit.GPU.xpc/com.apple.WebKit.GPU
/System/Library/Frameworks/WebKit.framework/XPCServices/com.apple.WebKit.WebContent.xpc/com.apple.WebKit.WebContent
/System/Library/Frameworks/AssetsLibrary.framework/Support/assetsd
/System/Library/PrivateFrameworks/NanoTimeKitCompanion.framework/nanotimekitcompaniond
/System/Library/PrivateFrameworks/NanoTimeKitCompanion.framework/XPCServices/NTKFaceSnapshotService.xpc/NTKFaceSnapshotService
/System/Library/PrivateFrameworks/IMTranscoding.framework/XPCServices/IMTranscoderAgent.xpc/IMTranscoderAgent
/System/Library/PrivateFrameworks/CoreSuggestions.framework/suggestd
/private/var/staged_system_apps/Maps.app/Maps

Proteas

Following are my steps to build the ARM64 version of xnu-4570.1.46, hope this is helpfull for saving time.
1. Use Xcode 9.0
2. Preparation is same as macOS, and there is a guide: https://0xcc.re/building-xnu-kernel-macosx-sierrra-10-12-x/
3. There is an ARM64 version libfirehose: https://github.com/Proteas/install_firehose_lib
4. Copy and edit the ARM64 config(CFLAGS, LDFLAGS) from darwin-on-arm/xnu to your target project
5. Example CFLAGS: -Darm64 -DARM64 -D__arm64__ -D__ARM64__ -DLP64 -DCONFIG_EMBEDDED -mkernel -DARM64_BOARD_CONFIG_T8011=1
6. Fix compiling stage errors by directly importing the missing headers or editing the code
7. Fix linking stage errors by implementing place holder funcitons for: chudxnu_cpu_alloc, etc 
8. If missing symbol __divti3 in linking stage, get the runtime from llvm.

Proteas

SYS_exit
SYS_read
SYS_write
SYS_open
SYS_close
SYS_unlink
SYS_chmod
SYS_chown
SYS_getfsstat
SYS_getuid