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Extract physmap free region scan

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khanhduytran0
2026-06-17 09:51:52 +07:00
parent 9eb2245d41
commit 2e70c25385
1 changed files with 37 additions and 45 deletions
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src/payload_377bed/entry1_type0x09_iogpu_physmap_engine.inc
+37 -45
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@@ -176,6 +176,41 @@ static inline uint64_t vmcopy_page_info_ref_from_addr(uint64_t addr, uint64_t pa
return (addr - linearBase) >> pageShift;
}
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;
vm_size_t regionSize = 0;
natural_t depth = 1;
natural_t info[19];
mach_msg_type_number_t infoCnt;
while ( 1 )
{
memset(info, 0, sizeof(info));
infoCnt = 19;
depth = 1;
__int64 kr = vm_region_recurse_64(
mach_task_self_,
&regionAddress,
&regionSize,
&depth,
(vm_region_recurse_info_t)info,
&infoCnt);
if ( (uint32_t)kr )
return kr;
if ( depth > 1 )
return 5;
if ( depth == 1 && regionSize >= requiredSize && *(memory_object_size_t *)((char *)&info[2] + 4) == 0 )
{
*baseOut = regionAddress;
*sizeOut = requiredSize;
return 0;
}
regionAddress += regionSize;
regionSize = 0;
}
}
//----- (00000000000068F4) ----------------------------------------------------
void __fastcall deallocate_physmap_pages(__int64 a1)
{
@@ -3373,8 +3408,6 @@ __int64 __fastcall kernel_read_loop_physmap(struct_krwCtx *krwCtx, __int64 a2, u
__int64 v42; // x24
mach_port_t *v43; // x21
unsigned __int64 v44; // x22
vm_address_t v45; // x8
__int64 v47; // x0
unsigned __int64 v48; // x8
unsigned __int64 v49; // x8
__int64 v50; // x23
@@ -3557,16 +3590,7 @@ LABEL_9:
v117 = v12;
free_region_address = 0;
v139 = 0;
LODWORD(v135) = 1;
memset(size, 0, 19 * sizeof(natural_t));
LODWORD(v134) = 19;
v42 = vm_region_recurse_64(
mach_task_self_,
&free_region_address,
&v139,
(natural_t *)&v135,
(vm_region_recurse_info_t)size,
(mach_msg_type_number_t *)&v134);
v42 = physmap_find_free_vm_region(v14 + 2 * vm_page_size, &free_region_address, &v139);
if ( (uint32_t)v42 )
{
LABEL_58:
@@ -3574,40 +3598,8 @@ LABEL_58:
v120 = 0;
goto LABEL_170;
}
while ( 1 )
{
if ( (unsigned int)v135 > 1 )
{
v42 = 5;
goto LABEL_58;
}
if ( (uint32_t)v135 == 1 )
{
v45 = v14 + 2 * vm_page_size;
if ( v139 >= v45 && *(memory_object_size_t *)((char *)&size[1] + 4) == 0 )
break;
}
free_region_address += v139;
v139 = 0;
LODWORD(v135) = 1;
memset(size, 0, 19 * sizeof(natural_t));
LODWORD(v134) = 19;
v47 = vm_region_recurse_64(
mach_task_self_,
&free_region_address,
&v139,
(natural_t *)&v135,
(vm_region_recurse_info_t)size,
(mach_msg_type_number_t *)&v134);
if ( (uint32_t)v47 )
{
v42 = v47;
goto LABEL_58;
}
}
v139 = v14 + 2 * vm_page_size;
*(uint64_t *)(a2 + 13864) = free_region_address;
atomic_store(v45, (unsigned __int64 *)(a2 + 13872));
atomic_store(v139, (unsigned __int64 *)(a2 + 13872));
*v13 = free_region_address;
v13[1] = v139;
TRACE_PHYSMAP("kernel_read_loop_physmap free region base=%llx size=%llx required=%llx\n",