Chameleon

Chameleon Commit Details

Date:2010-08-31 01:34:06 (13 years 7 months ago)
Author:Evan Lojewski
Commit:455
Parents: 454
Message:Kernel Patcher update, no longer removed the lapic_interrupt panic, instead configures the lapic correctly. Note: I did not optimize the opcode usage much, if more lapic configuration commands need ot be send, there is 4 bytes currently free and about 12 more can be freed easily
Changes:
M/branches/meklort/i386/modules/KernelPatcher/kernel_patcher.c

File differences

branches/meklort/i386/modules/KernelPatcher/kernel_patcher.c
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␉␊
␉register_kernel_patch(patch_lapic_init, KERNEL_32, CPUID_MODEL_ANY);␊
␊
␉//register_kernel_patch(patch_lapic_configure, KERNEL_32, CPUID_MODEL_ANY);␊
␉register_kernel_patch(patch_lapic_interrupt, KERNEL_32, CPUID_MODEL_ANY);␊
␉register_kernel_patch(patch_lapic_configure, KERNEL_32, CPUID_MODEL_ANY);␊
␉//register_kernel_patch(patch_lapic_interrupt, KERNEL_32, CPUID_MODEL_ANY);␊
␊
␉␊
␉register_kernel_symbol(KERNEL_32, "_panic");␊
␊
void patch_lapic_interrupt(void* kernelData)␊
{␊
␉// NOTE: this is a hack untill I finish patch_lapic_configure␊
␉UInt8* bytes = (UInt8*)kernelData;␊
␉␊
␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_interrupt");␊
␉␉printf("Unable to locate %s\n", "_lapic_interrupt_base");␊
␉␉return;␊
␉}␊
␉lapicInterruptBase = symbol->addr - textAddress; ␊
␊
␉lapicInterruptBase = symbol->addr;␊
␉patchLocation -= (UInt32)kernelData;␊
␉lapicStart -= (UInt32)kernelData;␊
␉lapicInterruptBase -= (UInt32)kernelData;␊
␉printf("\n\n\n\n\n\n\n"); // new lines so I can see things...␊
␉// Looking for the following:␊
␉//movl _lapic_start,%e_x␊
␉//addl $0x00000360,%e_x␊
␉// 8b 15 __ __ __ __ 81 c2 d0 00 00 00 65␊
␉//addl $0x00000320,%e_x␊
␉// 8b 15 __ __ __ __ 81 c2 20 03 00 00␊
␉while( ␊
␉␉ (bytes[patchLocation - 2] != 0x8b) ||␊
␉␉ //bytes[patchLocation -1] != 0x8b) ||␉// Register, we don't care what it is␊
␉␉ //bytes[patchLocation -1] != 0x15) ||␉// Register, we don't care what it is␊
␉␉ ( lapicStart != (UInt32)(␊
␉␉␉␉␉␉␉␉␉(bytes[patchLocation + 0] << 0 | ␊
␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 1] << 8 | ␊
␉␉␉␉␉␉␉␉␉)␊
␉␉␉␉␉␉␉␉ )␊
␉␉ ) || ␊
␉␉ (bytes[patchLocation + 7 ] != 0x00) ||␊
␉␉ (bytes[patchLocation + 4 ] != 0x81) ||␊
␉␉ //(bytes[patchLocation + 5 ] != 0Cx2) ||␉// register␊
␉␉ (bytes[patchLocation + 6 ] != 0x20) ||␊
␉␉ (bytes[patchLocation + 7 ] != 0x03) ||␊
␉␉ (bytes[patchLocation + 8 ] != 0x00) ||␊
␉␉ (bytes[patchLocation + 9 ] != 0x00) ||␊
␉␉ (bytes[patchLocation + 10] != 0x65)␊
␉␉ (bytes[patchLocation + 9] != 0x00)␊
␊
␉␉ )␊
␉{␊
␉␉␊
␉␉printf("0x%X 0x%X 0x%X 0x%X 0x%X, 0x%X\n", bytes[patchLocation - 1], bytes[patchLocation + 0], bytes[patchLocation + 1], bytes[patchLocation + 2], bytes[patchLocation + 3], lapicStart);␊
␉␉//getc();␊
␉␉patchLocation++;␊
␉}␊
␉patchLocation-=2;␊
␉printf("Patch location located at 0x%X\n", patchLocation);␊
␊
␉// NOTE: this is currently hardcoded, change it to be more resilient to changes␊
␉// At a minimum, I should have this do a cheksup first and if not matching, remove the panic instead.␊
␉␊
␉printf("0x%X 0x%X 0x%X 0x%X 0x%X, 0x%X\n", bytes[patchLocation - 0], bytes[patchLocation + 1], bytes[patchLocation + 2], bytes[patchLocation + 3], bytes[patchLocation + 4], lapicStart);␊
␉getc();␊
␉// 8b 15 __ __ __ __ -> movl␉␉ _lapic_start,%edx (NOTE: this should already be here)␊
␉/*␊
␉bytes[patchLocation++] = 0x8B;␊
␉bytes[patchLocation++] = 0x15;␊
␉bytes[patchLocation++] = (lapicStart & 0x000000FF) >> 0;␊
␉bytes[patchLocation++] = (lapicStart & 0x0000FF00) >> 8;␊
␉bytes[patchLocation++] = (lapicStart & 0x00FF0000) >> 16;␊
␉bytes[patchLocation++] = (lapicStart & 0xFF000000) >> 24;␊
␉*/␊
␉patchLocation += 6;␊
␉␊
␉// 81 c2 60 03 00 00 -> addl␉␉ $0x00000320,%edx␊
␉/*␊
␉bytes[patchLocation++] = 0x81;␊
␉bytes[patchLocation++] = 0xC2;␊
␉*/␊
␉patchLocation += 2;␊
␉bytes[patchLocation++] = 0x60;␊
␉/*␊
␉bytes[patchLocation++];// = 0x03;␊
␉bytes[patchLocation++];// = 0x00;␊
␉bytes[patchLocation++];// = 0x00;␊
␉*/␊
␉ patchLocation += 3;␊
␊
␉// TODO: Patch location has been located, verify that the function hasen't changed to and unpachable state␊
␉// c7 02 00 04 00 00 -> movl␉␉ $0x00000400,(%edx)␊
␉bytes[patchLocation++] = 0xC7;␊
␉bytes[patchLocation++] = 0x02;␊
␉bytes[patchLocation++] = 0x00;␊
␉bytes[patchLocation++] = 0x04;␊
␉bytes[patchLocation++] = 0x00;␊
␉bytes[patchLocation++] = 0x00;␊
␉␊
␉// 83 ea 40 -> subl␉␉ $0x40,edx␊
␉bytes[patchLocation++] = 0x83;␊
␉bytes[patchLocation++] = 0xEA;␊
␉bytes[patchLocation++] = 0x40;␊
␊
␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊
␉bytes[patchLocation++] = 0xA1;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊
␊
␉// 83 c0 0e -> addl␉␉ $0x0e,%eax␊
␉bytes[patchLocation++] = 0x83;␊
␉bytes[patchLocation++] = 0xC0;␊
␉bytes[patchLocation++] = 0x0E;␊
␊
␉// 89 02 -> movl␉␉ %eax,(%edx)␊
␉bytes[patchLocation++] = 0x89;␊
␉bytes[patchLocation++] = 0x02;␊
␉␊
␉// backup movl _lapic_interrupt_base,%e_x, so we know what the register is␊
␉// 81c230030000␉␉ addl␉␉ $0x00000330,%edx␊
␉bytes[patchLocation++] = 0x81;␊
␉bytes[patchLocation++] = 0xC2;␊
␉bytes[patchLocation++] = 0x30;␊
␉bytes[patchLocation++] = 0x03;␊
␉bytes[patchLocation++] = 0x00;␊
␉bytes[patchLocation++] = 0x00;␊
␉␊
␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊
␉bytes[patchLocation++] = 0xA1;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊
␉␊
␉// 83 c0 0f -> addl␉␉ $0x0f,%eax␊
␉bytes[patchLocation++] = 0x83;␊
␉bytes[patchLocation++] = 0xC0;␊
␉bytes[patchLocation++] = 0x0F;␊
␉␊
␉// 89 02 -> movl␉␉ %eax,(%edx)␊
␉bytes[patchLocation++] = 0x89;␊
␉bytes[patchLocation++] = 0x02;␊
␉␊
␉// 83 ea 10 -> subl␉␉ $0x10,edx␊
␉bytes[patchLocation++] = 0x83;␊
␉bytes[patchLocation++] = 0xEA;␊
␉bytes[patchLocation++] = 0x10;␊
␊
␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊
␉bytes[patchLocation++] = 0xA1;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊
␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊
␉␊
␉// 83 c0 0c -> addl␉␉ $0x0c,%eax␊
␉bytes[patchLocation++] = 0x83;␊
␉bytes[patchLocation++] = 0xC0;␊
␉bytes[patchLocation++] = 0x0C;␊
␊
␉// 89 02 -> movl␉␉ %eax,(%edx)␊
␉bytes[patchLocation++] = 0x89;␊
␉bytes[patchLocation++] = 0x02;␊
␊
␉// Replace remaining with nops␊
␊
␊
␉bytes[patchLocation++] = 0x90;␊
␉bytes[patchLocation++] = 0x90;␊
␉bytes[patchLocation++] = 0x90;␊
␉bytes[patchLocation++] = 0x90;␊
␉//␉bytes[patchLocation++] = 0x90; // double check the lenght of the patch...␊
␉//␉bytes[patchLocation++] = 0x90;␊
}␊

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