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[Qemu-devel] [PATCH V4 2/3] fuzz: Add fuzzing functions for L1/L2 table
From: |
Maria Kustova |
Subject: |
[Qemu-devel] [PATCH V4 2/3] fuzz: Add fuzzing functions for L1/L2 table entries |
Date: |
Mon, 11 Aug 2014 15:01:09 +0400 |
Signed-off-by: Maria Kustova <address@hidden>
---
tests/image-fuzzer/qcow2/fuzz.py | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/tests/image-fuzzer/qcow2/fuzz.py b/tests/image-fuzzer/qcow2/fuzz.py
index a53c84f..57527f9 100644
--- a/tests/image-fuzzer/qcow2/fuzz.py
+++ b/tests/image-fuzzer/qcow2/fuzz.py
@@ -325,3 +325,31 @@ def feature_name(current):
truncate_string(STRING_V, 46) # Fuzz padding (field length = 46)
]
return selector(current, constraints, string_validator)
+
+
+def l1_entry(current):
+ """Fuzz an entry of the L1 table."""
+ constraints = UINT64_V
+ # Reserved bits are ignored
+ # Added a possibility when only flags are fuzzed
+ offset = 0x7fffffffffffffff & random.choice([selector(current,
+ constraints),
+ current])
+ is_cow = random.randint(0, 1)
+ return offset + (is_cow << UINT64_M)
+
+
+def l2_entry(current):
+ """Fuzz an entry of an L2 table."""
+ constraints = UINT64_V
+ # Reserved bits are ignored
+ # Add a possibility when only flags are fuzzed
+ offset = 0x3ffffffffffffffe & random.choice([selector(current,
+ constraints),
+ current])
+ is_compressed = random.randint(0, 1)
+ is_cow = random.randint(0, 1)
+ is_zero = random.randint(0, 1)
+ value = offset + (is_cow << UINT64_M) + \
+ (is_compressed << UINT64_M - 1) + is_zero
+ return value
--
1.9.3