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plugin.cpp
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plugin.cpp
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#include <hexsuite.hpp>
#include <intel.hpp>
// NT constants.
//
static constexpr size_t index_self_ref = 0x1ED;
static constexpr ea_t make_pte_base( size_t level, size_t max_levels )
{
ea_t result = ~0ull << ( max_levels * 9 + 12 );
for ( size_t l = level; l != max_levels; l++ )
result |= index_self_ref << ( 9 * l + 12 );
return result;
}
static constexpr ea_t pfn_list_base_va48 = 0xFFFFFA8000000000;
static constexpr ea_t pfn_list_base_la57 = 0xFFFFDE0000000000;
static tinfo_t convert_dtype( uint32_t dtype )
{
switch ( dtype )
{
case dt_byte: return tinfo_t{ BT_INT8 };
case dt_word: return tinfo_t{ BT_INT16 };
case dt_dword: return tinfo_t{ BT_INT32 };
case dt_qword: return tinfo_t{ BT_INT64 };
case dt_byte16: return tinfo_t{ BT_INT128 };
case dt_float: return tinfo_t{ BT_FLOAT };
case dt_double: return tinfo_t{ BTMT_DOUBLE };
default: return tinfo_t{ BT_VOID };
}
}
// Optimizes out blocks generated due to inlined scheduler hints, hv enlightenments or instrumentations.
//
hex::insn_optimizer global_optimizer = [ ] ( mblock_t* blk, minsn_t* ins, auto )
{
// Skip if it isn't a conditional jump.
//
if ( !is_mcode_jcond( ins->opcode ) )
return 0;
// For each operand and sub-operand:
//
int res = ins->for_all_ops( hex::mop_visitor( [ ] ( mop_t* op, const tinfo_t* type, bool is_target )
{
std::pair<size_t, const char*> force_zero_list[] = {
{ 4, "KiIrqlFlags" },
{ 4, "HvlEnlightenments" },
{ 4, "HvlLongSpinCountMask" },
{ 0x10, "PerfGlobalGroupMask" },
};
// If referencing any of the globals above at any offset [0-8], assume constant zero.
//
for ( int delta = 0; delta <= 0x10; delta++ )
{
auto name = get_name( op->g - delta );
for ( auto& [sz, item] : force_zero_list )
{
if ( delta >= sz )
continue;
if ( name == item )
{
msg( "Ignoring %s\n", item );
op->make_number( 0, op->size );
return 1;
}
}
}
return 0;
} ) );
if ( res )
blk->mark_lists_dirty();
return res;
};
// Optimizes out blocks generated from PTE writing macro handling shadow ranges.
//
hex::insn_optimizer shadow_pte_update_optimizer = [ ] ( mblock_t* blk, minsn_t* ins, auto )
{
// Skip if it isn't a conditional jump.
//
if ( !is_mcode_jcond( ins->opcode ) )
return 0;
// For each operand and sub-operand:
//
int res = ins->for_all_ops( hex::mop_visitor( [ ] ( mop_t* op, const tinfo_t* type, bool is_target )
{
// If call type:
//
if ( op->t == mop_d && op->d->opcode == m_call && op->d->l.t == mop_v )
{
// If checking shadow PTE, assume 0 return.
//
auto callee = get_name( op->d->l.g );
if ( callee == "MiPteHasShadow" || callee == "MiPteInShadowRange" )
{
msg( "Ignoring %s\n", callee.c_str() );
op->make_number( 0, 4 );
return 1;
}
}
return 0;
} ) );
// If we changed anything, declare lists dirty.
//
if ( res )
blk->mark_lists_dirty();
return res;
};
// Optimizes out blocks generated from PTE reading macro handling shadow ranges.
//
hex::insn_optimizer shadow_pte_read_optimizer = [ ] ( mblock_t* blk, minsn_t* ins, auto )
{
// Skip if it isn't a conditional jump.
//
if ( !is_mcode_jcond( ins->opcode ) )
return 0;
// For each operand and sub-operand:
//
int res = ins->for_all_ops( hex::mop_visitor( [ ] ( mop_t* op, const tinfo_t* type, bool is_target )
{
// If and type:
//
if ( op->t == mop_d && op->d->opcode == m_and )
{
auto o1 = &op->d->l;
auto o2 = &op->d->r;
if ( o1->t == mop_n )
std::swap( o1, o2 );
// If Op1 is 0xC00000:
//
if ( o2->t == mop_n && o2->nnn->value == 0xC00000 )
{
// If Op2 is MiFlags:
//
if ( o1->t == mop_v && get_name( o1->g ) == "MiFlags" )
{
// Replace with number.
//
op->make_number( 0, 4 );
return 1;
}
}
}
return 0;
} ) );
// If we changed anything, declare lists dirty.
//
if ( res )
blk->mark_lists_dirty();
return res;
};
// Optimizes out system priority management on IRQL change.
//
hex::block_optimizer scheduler_hint_optimizer = [ ] ( mblock_t* blk )
{
int changes = 0;
for( minsn_t* ins : hex::instructions( blk ) )
{
// Skip if it does not match scheduler hint:
//
if ( ins->opcode != m_call || ins->l.t != mop_v || get_name( ins->l.g ) != "KiRemoveSystemWorkPriorityKick" )
continue;
msg( "Ignoring KiRemoveSystemWorkPriorityKick\n" );
// Clear the call.
//
blk->make_nop( ins );
changes++;
// Find predecessors.
//
for ( mblock_t* pred : hex::predecessors( blk ) )
for ( minsn_t* ins : hex::instructions( pred ) )
if ( ins != pred->tail )
pred->make_nop( ins );
}
return changes;
};
// Lifts int2c as assert failure.
//
hex::microcode_filter nt_assert_lifter = [ ] ( codegen_t& cg )
{
if ( cg.insn.itype != NN_int ||
cg.insn.ops[ 0 ].value != 0x2C )
return false;
auto ci = hex::call_info(
tinfo_t{ BT_VOID },
hex::call_arg( hex::phys_reg( R_cx, 4 ), tinfo_t{ BT_INT32 }, "code" )
);
ci->flags |= FCI_NORET;
cg.mb->insert_into_block(
hex::make_call( cg.insn.ea, hex::helper{ "__assert_fail" }, std::move( ci ) ).release(),
cg.mb->tail
);
return true;
};
// Lifts MOVABS on dynamic relocations to Mm intrinsics.
//
hex::microcode_filter mm_dyn_reloc_lifter = [ ] ( codegen_t& cg )
{
if ( cg.insn.itype == NN_mov &&
cg.insn.ops[ 0 ].type == o_reg &&
cg.insn.ops[ 1 ].type == o_imm )
{
ea_t imm = cg.insn.ops[ 1 ].value;
const char* intrinsic_getter = nullptr;
const char* intrinsic_rtype = nullptr;
size_t intrinsic_offset = 0;
// Handle PFN list:
//
if ( !intrinsic_getter )
{
for ( auto base : { pfn_list_base_va48, pfn_list_base_la57 } )
{
if ( base <= imm && imm <= ( base + 48 ) )
{
intrinsic_getter = "MmGetPfnDb";
intrinsic_rtype = "_MMPFN";
intrinsic_offset = imm - base;
break;
}
}
}
// Handle page tables:
//
if ( !intrinsic_getter )
{
for ( size_t paging_depth : { 4, 5 } )
{
constexpr const char* bnames[] = { "MmGetPml5eBase", "MmGetPml4eBase", "MmGetPdpteBase", "MmGetPdeBase", "MmGetPteBase" };
constexpr const char* lnames[] = { "MmGetPml5eLimit", "MmGetPml4eLimit", "MmGetPdpteLimit", "MmGetPdeLimit", "MmGetPteLimit" };
for ( size_t level = 0; level != paging_depth; level++ )
{
auto pmin = make_pte_base( level, paging_depth );
auto pmax = pmin + ( ( 1ull << ( 12 + 9 * level ) ) - 1 );
if ( !level && imm == ( pmin + 0x7F8 ) )
{
intrinsic_getter = "MmGetPxeUserLimit";
intrinsic_offset = 0;
intrinsic_rtype = "_MMPTE";
break;
}
else if ( !level && imm == ( pmin + ( index_self_ref ) * 8 ) )
{
intrinsic_getter = "MmGetPxeSelfRef";
intrinsic_offset = 0;
intrinsic_rtype = "_MMPTE";
break;
}
else if ( imm == pmax )
{
intrinsic_getter = lnames[ level + ( 5 - paging_depth ) ];
intrinsic_offset = 0;
intrinsic_rtype = "_MMPTE";
break;
}
else if ( pmin <= imm && imm <= pmax )
{
intrinsic_getter = bnames[ level + ( 5 - paging_depth ) ];
intrinsic_offset = imm - pmin;
intrinsic_rtype = "_MMPTE";
break;
}
}
if ( intrinsic_getter )
break;
}
}
// If we did find a match:
//
if ( intrinsic_getter )
{
tinfo_t type = {};
if ( tinfo_t ttype; ttype.get_named_type( get_idati(), intrinsic_rtype ) )
type.create_ptr( ttype );
else
type = tinfo_t{ BTF_UINT64 };
qstring types = {};
type.print( &types );
msg( "Found relocation: %s %s()\n", types.c_str(), intrinsic_getter );
auto call_info = hex::call_info( hex::pure_t{}, type );
auto call = hex::make_call( cg.insn.ea, hex::helper{ intrinsic_getter }, std::move( call_info ) );
auto adj = hex::make_add( cg.insn.ea, { intrinsic_offset, 8 }, std::move( call ), hex::phys_reg( cg.insn.ops[ 0 ].reg, 8 ) );
cg.mb->insert_into_block( adj.release(), cg.mb->tail);
cg.mb->mark_lists_dirty();
return true;
}
}
return false;
};
// Lifts CPUID.
//
hex::microcode_filter cpuid_lifter = [ ] ( codegen_t& cg )
{
if ( cg.insn.itype != NN_cpuid )
return false;
// Emit the cpuid intrinsic with a "magic" return.
//
auto cpuid_ci = hex::call_info(
tinfo_t{ BT_INT64 },
hex::call_arg( hex::phys_reg( R_ax, 4 ), tinfo_t{ BT_INT32 }, "leaf" ),
hex::call_arg( hex::phys_reg( R_cx, 4 ), tinfo_t{ BT_INT32 }, "subleaf" )
);
auto cpuid_call = hex::make_call( cg.insn.ea, hex::helper{ "__cpuid" }, std::move( cpuid_ci ) );
auto cpuid_res = hex::reg( cg.mba->alloc_kreg( 8 ), 8 );
cg.mb->insert_into_block(
hex::make_mov( cg.insn.ea, std::move( cpuid_call ), cpuid_res ).release(),
cg.mb->tail
);
// Create movs to each register.
//
std::pair<mreg_t, const char*> parts[] = {
{ reg2mreg( R_ax ), "EAX" },
{ reg2mreg( R_bx ), "EBX" },
{ reg2mreg( R_cx ), "ECX" },
{ reg2mreg( R_dx ), "EDX" }
};
for ( auto [reg, extr] : parts )
{
auto extract_ci = hex::call_info(
hex::pure_t{},
tinfo_t{ BT_INT32 },
hex::call_arg{ cpuid_res, tinfo_t{ BT_INT64 } }
);
auto extract_call = hex::make_call( cg.insn.ea, hex::helper( extr ), std::move( extract_ci ) );
auto mov_ins = hex::make_mov( cg.insn.ea, std::move( extract_call ), hex::reg( reg, 4 ) );
cg.mb->insert_into_block( mov_ins.release(), cg.mb->tail );
}
cg.mb->mark_lists_dirty();
return true;
};
// Lifts XGETBV.
//
hex::microcode_filter xgetbv_lifter = [ ] ( codegen_t& cg )
{
if ( cg.insn.itype != NN_xgetbv )
return false;
// Emit the XGETBV intrinsic.
//
auto xgetbv_ci = hex::call_info(
tinfo_t{ BT_INT64 },
hex::call_arg( hex::phys_reg( R_cx, 4 ), tinfo_t{ BT_INT32 }, "xcr" )
);
auto xgetbv_call = hex::make_call( cg.insn.ea, hex::helper{ "_xgetbv" }, std::move( xgetbv_ci ) );
auto xgetbv_res = hex::reg( cg.mba->alloc_kreg( 8 ), 8 );
cg.mb->insert_into_block(
hex::make_mov( cg.insn.ea, std::move( xgetbv_call ), xgetbv_res ).release(),
cg.mb->tail
);
// Create movs to each register.
//
cg.mb->insert_into_block( hex::make_low( cg.insn.ea, xgetbv_res, hex::phys_reg( R_ax, 4 ) ).release(), cg.mb->tail );
cg.mb->insert_into_block( hex::make_high( cg.insn.ea, xgetbv_res, hex::phys_reg( R_cx, 4 ) ).release(), cg.mb->tail );
cg.mb->mark_lists_dirty();
return true;
};
// Lifts XSETBV.
//
hex::microcode_filter xsetbv_lifter = [ ] ( codegen_t& cg )
{
if ( cg.insn.itype != NN_xsetbv )
return false;
// Emit the intrinsic.
//
auto xsetbv_ci = hex::call_info(
tinfo_t{ BT_VOID },
hex::call_arg( hex::phys_reg( R_cx, 4 ), tinfo_t{ BT_INT32 }, "xcr" ),
hex::call_arg( { hex::phys_reg( R_ax, 4 ), hex::phys_reg( R_dx, 4 ) }, tinfo_t( BT_INT64 ), "value" )
);
cg.mb->insert_into_block(
hex::make_call( cg.insn.ea, hex::helper{ "_xsetbv" }, std::move( xsetbv_ci ) ).release(),
cg.mb->tail
);
cg.mb->mark_lists_dirty();
return true;
};
// Lifts simple instructions.
//
constexpr std::pair<uint16_t, const char*> simple_instruction_list[] =
{
{ NN_clac, "__clac" },
{ NN_stac, "__stac" },
{ NN_swapgs, "__swapgs" },
{ NN_saveprevssp, "__saveprevssp" },
{ NN_setssbsy, "__setssbsy" },
{ NN_endbr64, "__endbr64" },
{ NN_endbr32, "__endbr32" },
{ NN_incsspq, "__incsspq" },
{ NN_incsspd, "__incsspd" },
{ NN_rstorssp, "__rstorssp" },
{ NN_wrssd, "__wrssd" },
{ NN_wrssq, "__wrssq" },
{ NN_wrussd, "__wrussd" },
{ NN_wrussq, "__wrussq" },
{ NN_clrssbsy, "__clrssbsy" },
{ NN_clflushopt, "_mm_clflushopt" },
{ NN_clwb, "_mm_clwb" },
{ NN_vmclear, "__vmclear" },
{ NN_vmlaunch, "__vmlaunch" },
{ NN_vmptrld, "__vmptrld" },
{ NN_vmptrst, "__vmptrst" },
{ NN_vmwrite, "__vmwrite" },
{ NN_vmxoff, "__vmxoff" },
{ NN_vmxon, "__vmxon" },
{ NN_invept, "_invept" },
{ NN_invvpid, "_invvpid" },
{ NN_invpcid, "_invpcid" },
{ NN_invlpga, "_invlpga" },
{ NN_xsaves, "_xsaves" },
{ NN_xrstors, "_xrstors" },
{ NN_prefetcht0, "_mm_prefetcht0" },
{ NN_prefetcht1, "_mm_prefetcht1" },
{ NN_prefetcht2, "_mm_prefetcht2" },
{ NN_prefetchnta, "_mm_prefetchnta" },
// TODO: vmfunc.
};
hex::microcode_filter simple_instruction_lifter = [ ] ( codegen_t& cg )
{
// Pick the intrinsic.
//
auto it = std::find_if( std::begin( simple_instruction_list ), std::end( simple_instruction_list ), [ & ] ( auto& pair )
{
return cg.insn.itype == pair.first;
} );
if ( it == std::end( simple_instruction_list ) )
return false;
hex::helper helper{ it->second };
// Create the call information.
//
auto ci = hex::call_info( tinfo_t{ BT_VOID } );
for ( auto& ops : cg.insn.ops )
{
if ( ops.type == o_void )
break;
if ( ops.type == o_imm )
{
tinfo_t t = convert_dtype( ops.dtype );
if ( t.is_void() ) return false;
ci->args.push_back( hex::call_arg{ hex::operand{ ops.value, ( int ) t.get_size() }, t } );
}
else if ( ops.type == o_reg )
{
tinfo_t t = convert_dtype( ops.dtype );
if ( t.is_void() ) return false;
ci->args.push_back( hex::call_arg{ hex::phys_reg( ops.reg, t.get_size() ), t } );
}
else
{
tinfo_t t{};
t.create_ptr( tinfo_t{ BT_VOID } );
ci->args.push_back( hex::call_arg{ hex::reg( cg.load_effective_address( &ops - &cg.insn.ops[ 0 ] ), 8 ), t } );
}
}
// Emit the intrinsic.
//
cg.mb->insert_into_block(
hex::make_call( cg.insn.ea, helper, std::move( ci ) ).release(),
cg.mb->tail
);
cg.mb->mark_lists_dirty();
return true;
};
// Lifts RDRAND/RDSEED.
//
hex::microcode_filter rdrand_rdseed_lifter = [ ] ( codegen_t& cg )
{
// Pick the intrinsic.
//
hex::helper helper{};
if ( cg.insn.itype == NN_rdrand )
helper = hex::helper{ "__rdrand" };
else if ( cg.insn.itype == NN_rdseed )
helper = hex::helper{ "__rdseed" };
else
return false;
// Create the call information.
//
tinfo_t t = convert_dtype( cg.insn.ops[ 0 ].dtype );
if ( t.is_void() ) return false;
auto ci = hex::call_info( t );
ci->spoiled.add( mr_cf, 1 );
auto call = hex::make_call( cg.insn.ea, helper, std::move( ci ) );
// Emit the mov of the result.
//
cg.mb->insert_into_block(
hex::make_mov( cg.insn.ea, std::move( call ), hex::phys_reg( cg.insn.ops[ 0 ].reg, t.get_size() ) ).release(),
cg.mb->tail
);
cg.mb->mark_lists_dirty();
return true;
};
// Lifts RDSSP.
//
hex::microcode_filter rdssp_lifter = [ ] ( codegen_t& cg )
{
// Pick the intrinsic.
//
hex::helper helper{};
if ( cg.insn.itype == NN_rdsspd )
helper = hex::helper{ "__rdsspd" };
else if ( cg.insn.itype == NN_rdsspq )
helper = hex::helper{ "__rdsspq" };
else
return false;
// Create the call information.
//
tinfo_t t = convert_dtype( cg.insn.ops[ 0 ].dtype );
if ( t.is_void() ) return false;
auto ci = hex::call_info( t );
auto call = hex::make_call( cg.insn.ea, helper, std::move( ci ) );
// Emit the mov of the result.
//
cg.mb->insert_into_block(
hex::make_mov( cg.insn.ea, std::move( call ), hex::phys_reg( cg.insn.ops[ 0 ].reg, t.get_size() ) ).release(),
cg.mb->tail
);
cg.mb->mark_lists_dirty();
return true;
};
// Lifts VMREAD.
//
hex::microcode_filter vmread_lifter = [ ] ( codegen_t& cg )
{
if ( cg.insn.itype != NN_vmread )
return false;
// Figure out the type used.
//
tinfo_t src_type = convert_dtype( cg.insn.ops[ 1 ].dtype );
if ( src_type.is_void() ) return false;
// Read memory address where relevant.
//
bool is_memory = cg.insn.ops[ 0 ].type != o_reg;
hex::operand mem_addr = {};
if ( is_memory )
mem_addr = hex::reg{ cg.load_effective_address( 0 ), 8 };
// Apply the intrinsic.
//
auto ci = hex::call_info(
hex::pure_t{},
src_type,
hex::call_arg( hex::phys_reg( cg.insn.ops[ 1 ].reg, src_type.get_size() ), src_type, "field" )
);
auto result = hex::make_call( cg.insn.ea, hex::helper{ "__vmread" }, std::move( ci ) );
// Move back the result.
//
if ( !is_memory )
cg.mb->insert_into_block( hex::make_mov( cg.insn.ea, std::move( result ), hex::phys_reg( cg.insn.ops[ 0 ].reg, src_type.get_size() ) ).release(), cg.mb->tail );
else
cg.mb->insert_into_block( hex::make_stx( cg.insn.ea, std::move( result ), hex::phys_reg( R_ds, 2 ), mem_addr ).release(), cg.mb->tail );
cg.mb->mark_lists_dirty();
return true;
};
// Lifts RCL/RCR.
//
hex::microcode_filter rcl_rcr_lifter = [ ] ( codegen_t& cg )
{
if ( cg.insn.itype != NN_rcr && cg.insn.itype != NN_rcl )
return false;
bool is_rcr = cg.insn.itype != NN_rcr;
// Figure out the type used.
//
tinfo_t src_type = convert_dtype( cg.insn.ops[ 0 ].dtype );
if ( src_type.is_void() ) return false;
// Allocate a temporary and mov the input register into it.
//
auto tmp = hex::reg( cg.mba->alloc_kreg( src_type.get_size() ), src_type.get_size() );
bool is_memory = cg.insn.ops[ 0 ].type != o_reg;
hex::operand mem_addr = {};
if ( !is_memory )
{
cg.mb->insert_into_block( hex::make_mov( cg.insn.ea, hex::phys_reg( cg.insn.ops[ 0 ].reg, src_type.get_size() ), tmp ).release(), cg.mb->tail );
}
else
{
mem_addr = hex::reg{ cg.load_effective_address( 0 ), 8 };
cg.mb->insert_into_block( hex::make_ldx( cg.insn.ea, hex::phys_reg( R_ds, 2 ), mem_addr, tmp ).release(), cg.mb->tail );
}
// Apply the intrinsic.
//
hex::call_arg count{ hex::operand{ 1, 1 }, tinfo_t{ BT_INT8 }, "count" };
if ( cg.insn.ops[ 1 ].type == o_reg )
count = { hex::phys_reg( R_cx, 1 ), tinfo_t{ BT_INT8 }, "count" };
auto ci = hex::call_info(
hex::pure_t{},
src_type,
hex::call_arg( tmp, src_type, "value" ),
hex::call_arg( hex::reg{ mr_cf, 1 }, tinfo_t{ BT_INT8 }, "carry" ),
count
);
ci->spoiled.add( mr_cf, 1 );
ci->spoiled.add( mr_of, 1 );
auto result = hex::make_call( cg.insn.ea, hex::helper{ is_rcr ? "__rcr" : "__rcl" }, std::move( ci ) );
// Move back the result.
//
if ( !is_memory )
cg.mb->insert_into_block( hex::make_mov( cg.insn.ea, std::move( result ), hex::phys_reg( cg.insn.ops[ 0 ].reg, src_type.get_size() ) ).release(), cg.mb->tail );
else
cg.mb->insert_into_block( hex::make_stx( cg.insn.ea, std::move( result ), hex::phys_reg( R_ds, 2 ), mem_addr ).release(), cg.mb->tail );
cg.mb->mark_lists_dirty();
return true;
};
// Lifts trap-frame setup.
//
hex::microcode_filter trapframe_lifter = [ ] ( codegen_t& cg )
{
constexpr const char* isr_list[] = {
"KxIsrLinkage", "KiCallUserMode", "KiApcInterrupt", "KiHvInterrupt",
"KiVmbusInterrupt0", "KiVmbusInterrupt1", "KiVmbusInterrupt2", "KiVmbusInterrupt3",
"KiSwInterrupt", "KiDpcInterrupt", "KiIpiInterrupt", "KyStartUserThread",
"KiDivideErrorFault", "KxDebugTrapOrFault", "KiNmiInterruptStart", "KiBreakpointTrap",
"KiOverflowTrap", "KiBoundFault", "KiInvalidOpcodeFault", "KiNpxNotAvailableFault",
"KiDoubleFaultAbort", "KiNpxSegmentOverrunAbort", "KiInvalidTssFault", "KiSegmentNotPresentFault",
"KiStackFault", "KiGeneralProtectionFault", "KiPageFault", "KiFloatingErrorFault",
"KiAlignmentFault", "KiMcheckAbort", "KxMcheckAlternateReturn", "KiXmmException",
"KiVirtualizationException", "KiControlProtectionFault", "KiRaiseSecurityCheckFailure", "KiRaiseAssertion",
"KiDebugServiceTrap", "KiSystemService", "KiSystemCall32", "KiServiceInternal",
"KiSystemCall64", "KiSystemCall32Shadow", "KiSystemCall64Shadow", "HalpBlkDivideErrorFault",
"HalpBlkDebugExceptionTrap", "HalpBlkBreakpointTrap", "HalpBlkOverflowTrap", "HalpBlkBoundRangeExceededFault",
"HalpBlkInvalidOpcodeFault", "HalpBlkDeviceNotAvailableFault", "HalpBlkDoubleFaultAbort", "HalpBlkCoprocessorSegmentOverrunFault",
"HalpBlkInvalidTssFault", "HalpBlkSegmentNotPresentFault", "HalpBlkStackSegmentFault", "HalpBlkGeneralProtectionFault",
"HalpBlkPageFault", "HalpBlkFloatingPointErrorFault", "HalpBlkAlignmentFault", "HalpBlkFloatingPointFault",
"HalpBlkVirtualizationFault", "HalpBlkReservedVector21", "HalpBlkReservedVector22", "HalpBlkReservedVector23",
"HalpBlkReservedVector24", "HalpBlkReservedVector25", "HalpBlkReservedVector26", "HalpBlkReservedVector27",
"HalpBlkReservedVector28", "HalpBlkReservedVector29", "HalpBlkReservedVector30", "HalpBlkReservedVector31",
"HalpBlkStubInterrupt", "HalpBlkSpuriousInterrupt", "HalpBlkIpiInterrupt", "HalpBlkLocalErrorInterrupt",
"HalpBlkMachineCheckAbort", "HalpBlkNmiInterrupt", "HalpBlkUnexpectedInterruptCommon"
};
// Match against LEA RBP, [RSP+0x80].
//
uint8_t expected[] = { 0x48 , 0x8D , 0xAC , 0x24 , 0x80 , 0x00 , 0x00, 0x00 };
uint8_t bytes[ std::size( expected ) ];
get_bytes( bytes, std::size( expected ), cg.insn.ea );
if ( memcmp( bytes, expected, std::size( expected ) ) )
return false;
// Match the name against an ISR.
//
auto name = get_name( cg.mba->entry_ea );
auto it = std::find_if( std::begin( isr_list ), std::end( isr_list ), [ & ] ( const char* n )
{
return name == n;
} );
if ( it == std::end( isr_list ) )
return false;
// Resolve trapframe type.
//
tinfo_t tinfo = {};
if ( !tinfo.get_named_type( hex::local_type_lib(), "_KTRAP_FRAME" ) )
return false;
tinfo_t pinfo = {};
ptr_type_data_t pi{ tinfo_t(), 0 };
pi.parent = tinfo;
pi.obj_type = tinfo;
pi.delta = 0x80;
pi.taptr_bits = 0x80;
pinfo.create_ptr( pi );
msg( "Inserted KeGetTrapFrame.\n" );
auto tf = hex::make_call(
cg.insn.ea,
hex::helper{ "KeGetTrapFrame" },
hex::call_info( hex::pure_t{}, pinfo )
);
cg.mb->insert_into_block( hex::make_mov( cg.insn.ea, std::move( tf ), hex::phys_reg( R_bp, 8 ) ).release(), cg.mb->tail );
cg.mb->mark_lists_dirty();
return true;
};
// Lifts the IRETQ instruction.
//
hex::microcode_filter iretq_lifter = [ ] ( codegen_t& cg )
{
if ( cg.insn.itype != NN_iretq )
return false;
auto load_at = [ & ] ( tinfo_t typ, size_t offset, const char* name )
{
auto ltmp = hex::reg{ cg.mba->alloc_kreg( 8 ), 8 };
auto tmp = hex::reg{ cg.mba->alloc_kreg( typ.get_size() ), ( int ) typ.get_size() };
cg.mb->insert_into_block( hex::make_add( cg.insn.ea, hex::phys_reg( R_sp, 8 ), hex::operand{ offset, 8 }, ltmp ).release(), cg.mb->tail );
cg.mb->insert_into_block( hex::make_ldx( cg.insn.ea, hex::phys_reg( R_ss, 2 ), ltmp, tmp ).release(), cg.mb->tail );
return hex::call_arg( tmp, typ, name );
};
tinfo_t vptr{};
vptr.create_ptr( tinfo_t{ BT_VOID } );
auto ci = hex::call_info(
tinfo_t{ BT_VOID },
load_at( vptr, 0, "ip" ),
load_at( tinfo_t{ BT_INT16 }, 8, "cs" ),
load_at( tinfo_t{ BT_INT32 }, 0x10, "flags" ),
load_at( vptr, 0x18, "sp" ),
load_at( tinfo_t{ BT_INT16 }, 0x20, "ss" )
);
ci->flags |= FCI_NORET;
cg.mb->insert_into_block( hex::make_call( cg.insn.ea, hex::helper( "__iretq" ), std::move( ci ) ).release(), cg.mb->tail );
cg.mb->mark_lists_dirty();
return true;
};
// Lifts the SYSRETQ instruction.
//
hex::microcode_filter sysretq_lifter = [ ] ( codegen_t& cg )
{
// Sysret with REX.W.
//
if ( cg.insn.itype != NN_sysret || get_byte( cg.insn.ea ) != 0x48 )
return false;
tinfo_t vptr{};
vptr.create_ptr( tinfo_t{ BT_VOID } );
auto ci = hex::call_info(
tinfo_t{ BT_VOID },
hex::call_arg( hex::phys_reg( R_cx, 8 ), vptr, "ip" ),
hex::call_arg( hex::phys_reg( R_r11, 4 ), tinfo_t{ BT_INT32 }, "flags" )
);
ci->flags |= FCI_NORET;
cg.mb->insert_into_block( hex::make_call( cg.insn.ea, hex::helper( "__sysretq" ), std::move( ci ) ).release(), cg.mb->tail );
cg.mb->mark_lists_dirty();
return true;
};
// Lifts RSB flushing on ISRs.
//
constexpr uint8_t rsb_pattern[] = {
/*
.text:00000001403A9519 E8 0E 01 00 00 call loc_1403A962C
.text:00000001403A951E
.text:00000001403A951E loc_1403A951E: ; CODE XREF: KiPageFault+16B
.text:00000001403A951E 48 83 C4 08 add rsp, 8
.text:00000001403A9522 E8 0E 01 00 00 call loc_1403A9635
*/
0xE8, 0x0E, 0x01, 0x00, 0x00,
0x48, 0x83, 0xC4, 0x08,
0xE8, 0x0E, 0x01, 0x00, 0x00
};
constexpr uint8_t rsb_replace_with[] = {
// 9 byte nop (call + add rsp) | encodes special constant indicating RSB flush.
0x66, 0x0F, 0x1F, 0x84, 0xDE, 0xAD, 0xC0, 0xFE, 0xFE,
// original final call as jmp with offset changed
0xE9, 0x12, 0x01, 0x00, 0x00
};
hex::microcode_filter isr_rsb_flush_lifter = [ ] ( codegen_t& cg )
{
// Skip if it does not match the RSB replacement.
//
if ( cg.insn.itype != NN_nop )
return false;
uint8_t buffer[ std::size( rsb_replace_with ) ];
get_bytes( buffer, std::size( buffer ), cg.insn.ea );
if ( memcmp( buffer, rsb_replace_with, std::size( rsb_replace_with ) ) )
return false;
// Make a dummy call and insert it into the block.
//
cg.mb->insert_into_block(
hex::make_call( cg.insn.ea, hex::helper{ "__flush_rsb" }, hex::call_info( tinfo_t{ BT_VOID } ) ).release(),
cg.mb->tail
);;
cg.mb->mark_lists_dirty();
return true;
};
// Type fixing:
//
constexpr std::pair<const char*, const char*> parent_types_list[] = {
{ "_KTHREAD", "_ETHREAD" },
{ "_KPROCESS", "_EPROCESS" },
};
static std::vector<std::pair<tinfo_t, tinfo_t>> get_parent_type_pairs()
{
std::vector<std::pair<tinfo_t, tinfo_t>> list = {};
for ( auto& [src, dst] : parent_types_list )
{
tinfo_t srct, dstt{};
if ( !srct.get_named_type( hex::local_type_lib(), src ) ||
!dstt.get_named_type( hex::local_type_lib(), dst ) )
continue;
list.emplace_back( srct, dstt );
}
return list;
}
static tinfo_t type_replace_rec( tinfo_t value, const tinfo_t& src, const tinfo_t& dst ) {
if ( value == src )
return dst;
if ( value.is_ptr() )
{
ptr_type_data_t pi;
value.get_ptr_details( &pi );
if ( pi.obj_type == src || pi.parent == src )
{
if ( pi.obj_type == src )
pi.obj_type = dst;
if ( pi.parent == src )
pi.parent = dst;
value.create_ptr( pi );
return value;
}
}
return value;
}
hex::hexrays_callback type_enforcer = hex::hexrays_callback_for<hxe_maturity>( [ ] ( cfunc_t* cf, ctree_maturity_t mat )
{
if ( mat == CMAT_ZERO )
{
auto replace_list = get_parent_type_pairs();
if ( replace_list.empty() )
return 0;
for ( auto blk : hex::basic_blocks( cf->mba ) )
for ( auto& lvar : blk->mba->vars )
for ( auto& [src, dst] : replace_list )
lvar.set_lvar_type( type_replace_rec( lvar.type(), src, dst) );
}
return 0;
} );
static void fix_udts()
{
// Get the replace list, if there is nothing to do, return.
//
auto replace_list = get_parent_type_pairs();
if ( replace_list.empty() )
return;
// For each named type:
//
std::vector<std::pair<std::string, tinfo_t>> list = {};
for ( const char* type_name_o : hex::named_types() )
{
// Get named type information, if not UDT skip.
//
tinfo_t ti{};
ti.get_named_type( hex::local_type_lib(), type_name_o );
if ( !ti.is_udt() )
continue;
// Save the type name since we'll erase the old one.
//
list.emplace_back( std::string{ type_name_o }, ti );
}
for ( auto& [type_name, ti] : list )
{
// Get UDT details.
//
udt_type_data_t ui;
ti.get_udt_details( &ui );
// For each field:
//
size_t replace_count = 0;
for ( auto& field : ui )
{
// Go through the replace list and invoke it on the field type.
//
auto orig_type = field.type;
for ( auto& [s, d] : replace_list )
{
// Skip in case it's recursive.
//
if ( ti == d )
continue;
field.type = type_replace_rec( field.type, s, d );
}
// If field type is changed, increment replacement count.
//
replace_count += orig_type != field.type;
}
// If type remains unchanged continue.
//
if ( !replace_count )
continue;
msg( "Fixed type '%s'.\n", type_name.c_str() );
// Replace by-ordinal references to the original structure w named references.
//
auto* mtil = ( til_t* ) hex::local_type_lib();
replace_ordinal_typerefs( mtil, &ti );
// Set the new type.
//
tinfo_t nti{};
nti.create_udt( ui, ti.is_union() ? BTF_UNION : BTF_STRUCT );
nti.set_named_type( mtil, type_name.c_str(), NTF_REPLACE );
}
}
// Removes RSB flush gadgets.
//
static void remove_rsb_flush()
{
ea_t iterator = inf_get_min_ea();
while ( true )
{
#if IDP_INTERFACE_VERSION>=900
iterator = bin_search3(
#else
iterator = bin_search2(
#endif
iterator,
inf_get_max_ea(),
rsb_pattern,
nullptr,
std::size( rsb_pattern ),
BIN_SEARCH_FORWARD
);
if ( iterator == BADADDR )
break;
put_bytes( iterator, rsb_replace_with, std::size( rsb_replace_with ) );
iterator += std::size( rsb_replace_with );
}
}
// Creates KUSER_SHARED_DATA segments.
//
static void create_kuser_seg()
{
constexpr auto km = 0xFFFFF78000000000;
constexpr auto um = 0x7FFE0000;
add_segm( 0x1000, km, km + 0x1000, ".kkuser", "DATA" );
add_segm( 0x1000, um, um + 0x1000, ".ukuser", "CONST" );
if ( inf_is_kernel_mode() )
set_name( um, "UKUSER_SHARED_DATA" ), set_name( km, "KUSER_SHARED_DATA" );
else
set_name( um, "KUSER_SHARED_DATA" ), set_name( km, "KKUSER_SHARED_DATA" );
if ( tinfo_t type{}; type.get_named_type( hex::local_type_lib(), "_KUSER_SHARED_DATA" ) )
{
#if IDP_INTERFACE_VERSION>=900
tinfo_t tif;
tif.get_named_type(nullptr, "_KUSER_SHARED_DATA");
if (!tif.present())
{
msg("lack define of _KUSER_SHARED_DATA, strange\n");
}
else
{
create_struct( km, type.get_size(), tif.get_tid(), true);
create_struct( um, type.get_size(), tif.get_tid(), true);
}