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Code Issues Releases Wiki Activity

GP-1571 ELF: create fake relocation table entry for non-relocation memory modifications (needed for ELF export)

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ghidra1 2021-12-13 14:52:24 -05:00
parent b5927ce849
commit 9076b2429c
5 changed files with 66 additions and 17 deletions
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33
Ghidra/Processors/MIPS/src/main/java/ghidra/app/util/bin/format/elf/extend/MIPS_ElfExtension.java
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@ -454,7 +454,7 @@ public class MIPS_ElfExtension extends ElfExtension {
setTableEntryIfZero(gotBaseAddress, gotIndex, symbolOffset, elfLoadHelper);
}
catch (MemoryAccessException e) {
catch (MemoryAccessException | AddressOverflowException e) {
Msg.error(this, "Failed to update .got table entry", e);
}
catch (NotFoundException e) {
@ -793,7 +793,7 @@ public class MIPS_ElfExtension extends ElfExtension {
catch (NotFoundException e) {
throw new AssertException("unexpected", e);
}
catch (MemoryAccessException e) {
catch (MemoryAccessException | AddressOverflowException e) {
elfLoadHelper.log("Failed to adjust GOT: " + e.getMessage());
}
}
@ -846,37 +846,42 @@ public class MIPS_ElfExtension extends ElfExtension {
catch (NotFoundException e) {
throw new AssertException("unexpected", e);
}
catch (MemoryAccessException e) {
catch (MemoryAccessException | AddressOverflowException e) {
elfLoadHelper.log("Failed to adjust MIPS GOT: " + e.getMessage());
}
}
private Address adjustTableEntryIfNonZero(Address tableBaseAddr, int entryIndex,
long adjustment, ElfLoadHelper elfLoadHelper) throws MemoryAccessException {
// TODO: record artificial relative relocation for reversion/export concerns
long adjustment, ElfLoadHelper elfLoadHelper)
throws MemoryAccessException, AddressOverflowException {
boolean is64Bit = elfLoadHelper.getElfHeader().is64Bit();
Memory memory = elfLoadHelper.getProgram().getMemory();
Address tableEntryAddr;
if (is64Bit) {
tableEntryAddr = tableBaseAddr.add(entryIndex * 8);
long offset = memory.getLong(tableEntryAddr);
if (offset != 0) {
memory.setLong(tableEntryAddr, offset + adjustment);
if (adjustment != 0) {
long offset = memory.getLong(tableEntryAddr);
if (offset != 0) {
elfLoadHelper.addFakeRelocTableEntry(tableEntryAddr, 8);
memory.setLong(tableEntryAddr, offset + adjustment);
}
}
}
else {
tableEntryAddr = tableBaseAddr.add(entryIndex * 4);
int offset = memory.getInt(tableEntryAddr);
if (offset != 0) {
memory.setInt(tableEntryAddr, (int) (offset + adjustment));
if (adjustment != 0) {
int offset = memory.getInt(tableEntryAddr);
if (offset != 0) {
elfLoadHelper.addFakeRelocTableEntry(tableEntryAddr, 4);
memory.setInt(tableEntryAddr, (int) (offset + adjustment));
}
}
}
return tableEntryAddr;
}
private Address setTableEntryIfZero(Address tableBaseAddr, int entryIndex, long value,
ElfLoadHelper elfLoadHelper) throws MemoryAccessException {
// TODO: record artificial relative relocation for reversion/export concerns
ElfLoadHelper elfLoadHelper) throws MemoryAccessException, AddressOverflowException {
boolean is64Bit = elfLoadHelper.getElfHeader().is64Bit();
Memory memory = elfLoadHelper.getProgram().getMemory();
Address tableEntryAddr;
@ -884,6 +889,7 @@ public class MIPS_ElfExtension extends ElfExtension {
tableEntryAddr = tableBaseAddr.add(entryIndex * 8);
long offset = memory.getLong(tableEntryAddr);
if (offset == 0) {
elfLoadHelper.addFakeRelocTableEntry(tableEntryAddr, 8);
memory.setLong(tableEntryAddr, value);
}
}
@ -891,6 +897,7 @@ public class MIPS_ElfExtension extends ElfExtension {
tableEntryAddr = tableBaseAddr.add(entryIndex * 4);
int offset = memory.getInt(tableEntryAddr);
if (offset == 0) {
elfLoadHelper.addFakeRelocTableEntry(tableEntryAddr, 4);
memory.setInt(tableEntryAddr, (int) value);
}
}