From: Wei Liu <wei.liu2@citrix.com>
Date: Wed, 25 Jan 2017 15:35:54 +0000 (+0000)
Subject: fuzz/x86emul: print out minimal input size
X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~2848
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=c6a43412d7ce6f57c2997105f635f4c6a38d9de0;p=xen.git

fuzz/x86emul: print out minimal input size

... so that users can know how big the initial input should be.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---

diff --git a/tools/fuzz/x86_instruction_emulator/afl-x86-insn-emulator-fuzzer.c b/tools/fuzz/x86_instruction_emulator/afl-x86-insn-emulator-fuzzer.c
index 494c23ba2e..16edbd6bab 100644
--- a/tools/fuzz/x86_instruction_emulator/afl-x86-insn-emulator-fuzzer.c
+++ b/tools/fuzz/x86_instruction_emulator/afl-x86-insn-emulator-fuzzer.c
@@ -2,8 +2,10 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 extern int LLVMFuzzerTestOneInput(const uint8_t *data_p, size_t size);
+extern unsigned int fuzz_minimal_input_size(void);
 
 #define INPUT_SIZE  4096
 static uint8_t input[INPUT_SIZE];
@@ -21,6 +23,12 @@ int main(int argc, char **argv)
         exit(-1);
     }
 
+    if ( !strcmp(argv[1], "--min-input-size") )
+    {
+        printf("%u\n", fuzz_minimal_input_size());
+        exit(0);
+    }
+
     fp = fopen(argv[1], "rb");
     if ( fp == NULL )
     {
diff --git a/tools/fuzz/x86_instruction_emulator/x86-insn-emulator-fuzzer.c b/tools/fuzz/x86_instruction_emulator/x86-insn-emulator-fuzzer.c
index 22d2d87e9c..3b6d33aa25 100644
--- a/tools/fuzz/x86_instruction_emulator/x86-insn-emulator-fuzzer.c
+++ b/tools/fuzz/x86_instruction_emulator/x86-insn-emulator-fuzzer.c
@@ -708,6 +708,11 @@ int LLVMFuzzerTestOneInput(const uint8_t *data_p, size_t size)
     return 0;
 }
 
+unsigned int fuzz_minimal_input_size(void)
+{
+    return DATA_OFFSET + 1;
+}
+
 /*
  * Local variables:
  * mode: C