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Code Issues Releases Wiki Activity

GP-2586 Exceptions for injection error conditions

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This commit is contained in:
caheckman 2022-09-28 17:19:55 -04:00
parent dc927fc7be
commit e996440c77
9 changed files with 240 additions and 206 deletions
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16
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/InjectPayload.java
View file

@ -20,8 +20,10 @@ import java.io.IOException;
import ghidra.app.plugin.processors.sleigh.PcodeEmit;
import ghidra.app.plugin.processors.sleigh.SleighLanguage;
import ghidra.program.model.listing.Program;
import ghidra.program.model.mem.MemoryAccessException;
import ghidra.program.model.pcode.Encoder;
import ghidra.program.model.pcode.PcodeOp;
import ghidra.util.exception.NotFoundException;
import ghidra.xml.XmlParseException;
import ghidra.xml.XmlPullParser;
@ -122,8 +124,13 @@ public interface InjectPayload {
* Given a context, send the p-code payload to the emitter
* @param context is the context for injection
* @param emit is the object accumulating the final p-code
* @throws MemoryAccessException for problems establishing the injection context
* @throws IOException for problems while emitting the injection p-code
* @throws UnknownInstructionException if there is no underlying instruction being injected
* @throws NotFoundException if an expected aspect of the injection is not present in context
*/
public void inject(InjectContext context, PcodeEmit emit);
public void inject(InjectContext context, PcodeEmit emit) throws MemoryAccessException,
IOException, UnknownInstructionException, NotFoundException;
/**
* A convenience function wrapping the inject method, to produce the final set
@ -131,8 +138,13 @@ public interface InjectPayload {
* @param program is the Program for which injection is happening
* @param con is the context for injection
* @return the array of PcodeOps
* @throws MemoryAccessException for problems establishing the injection context
* @throws IOException for problems while emitting the injection p-code
* @throws UnknownInstructionException if there is no underlying instruction being injected
* @throws NotFoundException if an expected aspect of the injection is not present in context
*/
public PcodeOp[] getPcode(Program program, InjectContext con);
public PcodeOp[] getPcode(Program program, InjectContext con) throws MemoryAccessException,
IOException, UnknownInstructionException, NotFoundException;
/**
* @return true if the injected p-code falls thru

47
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/InjectPayloadSleigh.java
View file

@ -27,7 +27,9 @@ import ghidra.app.plugin.processors.sleigh.template.*;
import ghidra.program.model.address.Address;
import ghidra.program.model.address.AddressFactory;
import ghidra.program.model.listing.Program;
import ghidra.program.model.mem.MemoryAccessException;
import ghidra.program.model.pcode.*;
import ghidra.util.exception.NotFoundException;
import ghidra.util.xml.SpecXmlUtils;
import ghidra.xml.*;
@ -163,22 +165,19 @@ public class InjectPayloadSleigh implements InjectPayload {
}
@Override
public void inject(InjectContext context, PcodeEmit emit) {
public void inject(InjectContext context, PcodeEmit emit) throws UnknownInstructionException,
MemoryAccessException, IOException, NotFoundException {
ParserWalker walker = emit.getWalker();
try {
walker.snippetState();
setupParameters(context, walker);
emit.build(pcodeTemplate, -1);
}
catch (Exception e) { // Should not be happening in a CallFixup
e.printStackTrace();
return;
}
walker.snippetState();
setupParameters(context, walker);
emit.build(pcodeTemplate, -1);
emit.resolveRelatives();
}
@Override
public PcodeOp[] getPcode(Program program, InjectContext con) {
public PcodeOp[] getPcode(Program program, InjectContext con)
throws UnknownInstructionException, MemoryAccessException, IOException,
NotFoundException {
SleighParserContext protoContext =
new SleighParserContext(con.baseAddr, con.nextAddr, con.refAddr, con.callAddr);
ParserWalker walker = new ParserWalker(protoContext);
@ -333,29 +332,36 @@ public class InjectPayloadSleigh implements InjectPayload {
/**
* Verify that the storage locations passed -con- match the restrictions for this payload
* @param con is InjectContext containing parameter storage locations
* @throws NotFoundException for expected aspects of the context that are not present
*/
private void checkParameterRestrictions(InjectContext con, Address addr) {
private void checkParameterRestrictions(InjectContext con, Address addr)
throws NotFoundException {
int insize = (con.inputlist == null) ? 0 : con.inputlist.size();
if (inputlist.length != insize) {
throw new SleighException(
"Input parameters do not match injection specification: " + source);
throw new NotFoundException(
"Input parameters do not match specification " + name + " in\n" + source);
}
for (int i = 0; i < inputlist.length; ++i) {
int sz = inputlist[i].getSize();
if (sz != 0 && sz != con.inputlist.get(i).getSize()) {
throw new SleighException(
"Input parameter size does not match injection specification: " + source);
throw new NotFoundException(
"Input parameter size does not match specification " + name + " in\n" + source);
}
}
int outsize = (con.output == null) ? 0 : con.output.size();
if (output.length != outsize) {
throw new SleighException("Output does not match injection specification: " + source);
if (outsize == 0) {
throw new NotFoundException(
"Output expected by specification " + name + " in\n" + source);
}
throw new NotFoundException(
"Output not expected by specification " + name + " in\n" + source);
}
for (int i = 0; i < output.length; ++i) {
int sz = output[i].getSize();
if (sz != 0 && sz != con.output.get(i).getSize()) {
throw new SleighException(
"Output size does not match injection specification: " + source);
throw new NotFoundException(
"Output size does not match specification " + name + " in\n" + source);
}
}
}
@ -365,9 +371,10 @@ public class InjectPayloadSleigh implements InjectPayload {
* @param con is the InjectContext containing storage locations
* @param walker is the sleigh parser state object
* @throws UnknownInstructionException if there are too many parameters for the parser
* @throws NotFoundException for expected aspects of the context that are not present
*/
private void setupParameters(InjectContext con, ParserWalker walker)
throws UnknownInstructionException {
throws UnknownInstructionException, NotFoundException {
checkParameterRestrictions(con, walker.getAddr());
for (int i = 0; i < inputlist.length; ++i) {
walker.allocateOperand();