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Subject[v2, 3/4] Demonstrating unit testing via simple-harness
Date
Simple-harness.c uses inline asm support to generate asm and then has the
emulator emulate this code. This may be useful as a form of testing for
the emulator.

CR: https://code.amazon.com/reviews/CR-8591638
---
tools/fuzz/x86ie/Makefile | 7 ++++--
tools/fuzz/x86ie/simple-harness.c | 42 +++++++++++++++++++++++++++++++
2 files changed, 47 insertions(+), 2 deletions(-)
create mode 100644 tools/fuzz/x86ie/simple-harness.c

diff --git a/tools/fuzz/x86ie/Makefile b/tools/fuzz/x86ie/Makefile
index d45fe6d266b9..e79d275e1040 100644
--- a/tools/fuzz/x86ie/Makefile
+++ b/tools/fuzz/x86ie/Makefile
@@ -44,8 +44,11 @@ LOCAL_OBJS := emulator_ops.o stubs.o
afl-harness: afl-harness.o $(LOCAL_OBJS) $(KERNEL_OBJS)
@$(CC) -v $(KBUILD_CFLAGS) $(LOCAL_OBJS) $(KERNEL_OBJS) $< $(INCLUDES) -Istubs.h -o $@ -no-pie

-all: afl-harness
+simple-harness: simple-harness.o $(LOCAL_OBJS) $(KERNEL_OBJS)
+ @$(CC) -v $(KBUILD_CFLAGS) $(LOCAL_OBJS) $(KERNEL_OBJS) $< $(INCLUDES) -Istubs.h -o $@ -no-pie
+
+all: afl-harness simple-harness

.PHONY: clean
clean:
- $(RM) -r *.o afl-harness
+ $(RM) -r *.o afl-harness simple-harness
diff --git a/tools/fuzz/x86ie/simple-harness.c b/tools/fuzz/x86ie/simple-harness.c
new file mode 100644
index 000000000000..f21fdafe1dd1
--- /dev/null
+++ b/tools/fuzz/x86ie/simple-harness.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include "emulator_ops.h"
+#include <asm/kvm_emulate.h>
+
+extern void foo(void)
+{
+ asm volatile("__start:"
+ ".byte 0x32, 0x05, 0x00, 0x00, 0x00, 0x00;" // xor eax,DWORD PTR [rip+0x0]
+ ".byte 0x90;"
+ //".byte 0x0f, 0x7f, 0xde;" // movq mm6,mm3
+ ".byte 0x0f, 0x6f, 0xde;" // same instruction...
+ ".byte 0x90;"
+ "__end:");
+}
+
+int main(int argc, char **argv)
+{
+ extern unsigned char __start;
+ extern unsigned char __end;
+ struct state *state = create_emulator();
+ int rc;
+
+ /* Ensures the emulator is in a valid state. */
+ initialize_emulator(state);
+
+ /* Provide the emulator with instructions to emulate. */
+ state->data = &__start;
+ state->data_available = &__end - &__start;
+
+ /* rip addressed instruction */
+ rc = emulate_until_complete(state);
+
+ /* Free the emulator. */
+ free_emulator(state);
+
+ return 0;
+}
--
2.17.1



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Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Ralf Herbrich
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
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