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Message-Id: <E1cyI60-0001sg-Cd@xenbits.xenproject.org>
Date: Wed, 12 Apr 2017 13:14:04 +0000
Subject: [Xen-changelog] [xen master] tools/insn-fuzz: Avoid making use of
	static data
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commit b163e550df2127b2bd1fbce682bed87e8d18d0dc
Author:     Andrew Cooper <andrew.cooper3@citrix.com>
AuthorDate: Mon Mar 20 18:33:59 2017 +0000
Commit:     Andrew Cooper <andrew.cooper3@citrix.com>
CommitDate: Thu Apr 6 18:42:49 2017 +0100

    tools/insn-fuzz: Avoid making use of static data
   =20
    AFL has a measure of stability, where it passes the same corpus into th=
e
    fuzzing harness and observes whether the execution path changes from be=
fore.
    Any instability in the fuzzing harness reduces its effectiveness, as an
    observed crash may not reliably be caused by the original corpus.
   =20
    In preparation to fix a stability bug, introduce struct fuzz_state, all=
ocated
    on the stack and passed around via struct x86_emulate_ctxt's data param=
eter.
    Propagate ctxt into the helpers such as maybe_fail(), so the state can =
be
    retrieved.
   =20
    Move the previously-static data_{index,num} into struct fuzz_state.
   =20
    Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
    Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
 tools/fuzz/x86_instruction_emulator/fuzz-emul.c | 181 +++++++++++++++-----=
----
 1 file changed, 116 insertions(+), 65 deletions(-)

diff --git a/tools/fuzz/x86_instruction_emulator/fuzz-emul.c b/tools/fuzz/x=
86_instruction_emulator/fuzz-emul.c
index 64b7fb2..db0719e 100644
--- a/tools/fuzz/x86_instruction_emulator/fuzz-emul.c
+++ b/tools/fuzz/x86_instruction_emulator/fuzz-emul.c
@@ -21,7 +21,9 @@
=20
 #define SEG_NUM x86_seg_none
=20
-struct input_struct {
+/* Layout of data expected as fuzzing input. */
+struct fuzz_corpus
+{
     unsigned long cr[5];
     uint64_t msr[MSR_INDEX_MAX];
     struct cpu_user_regs regs;
@@ -29,19 +31,36 @@ struct input_struct {
     unsigned long options;
     unsigned char data[4096];
 } input;
-#define DATA_OFFSET offsetof(struct input_struct, data)
-static unsigned int data_index;
-static unsigned int data_num;
+#define DATA_OFFSET offsetof(struct fuzz_corpus, data)
+
+/*
+ * Internal state of the fuzzing harness.  Calculated initially from the i=
nput
+ * corpus, and later mutates by the emulation callbacks.
+ */
+struct fuzz_state
+{
+    /* Fuzzer's input data. */
+    struct fuzz_corpus *corpus;
+
+    /* Real amount of data backing corpus->data[]. */
+    size_t data_num;
+
+    /* Amount of corpus->data[] consumed thus far. */
+    size_t data_index;
+};
=20
 /*
  * Randomly return success or failure when processing data.  If
  * `exception` is false, this function turns _EXCEPTION to _OKAY.
  */
-static int maybe_fail(const char *why, bool exception)
+static int maybe_fail(struct x86_emulate_ctxt *ctxt,
+                      const char *why, bool exception)
 {
+    struct fuzz_state *s =3D ctxt->data;
+    const struct fuzz_corpus *c =3D s->corpus;
     int rc;
=20
-    if ( data_index >=3D data_num )
+    if ( s->data_index >=3D s->data_num )
         rc =3D X86EMUL_EXCEPTION;
     else
     {
@@ -50,13 +69,13 @@ static int maybe_fail(const char *why, bool exception)
          * 25% unhandlable
          * 25% exception
          */
-        if ( input.data[data_index] > 0xc0 )
+        if ( c->data[s->data_index] > 0xc0 )
             rc =3D X86EMUL_EXCEPTION;
-        else if ( input.data[data_index] > 0x80 )
+        else if ( c->data[s->data_index] > 0x80 )
             rc =3D X86EMUL_UNHANDLEABLE;
         else
             rc =3D X86EMUL_OKAY;
-        data_index++;
+        s->data_index++;
     }
=20
  =20
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