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[PATCH 05/12] fuzz: Declare DMA Read callback function
From: |
Alexander Bulekov |
Subject: |
[PATCH 05/12] fuzz: Declare DMA Read callback function |
Date: |
Wed, 22 Jul 2020 23:39:26 -0400 |
This patch declares the fuzz_dma_read_cb function and uses the
preprocessor and linker(weak symbols) to handle these cases:
When we build softmmu/all with --enable-fuzzing, there should be no
strong symbol defined for fuzz_dma_read_cb, and we link against a weak
stub function.
When we build softmmu/fuzz with --enable-fuzzing, we link agains the
strong symbol in general_fuzz.c
When we build softmmu/all without --enable-fuzzing, fuzz_dma_read_cb is
an empty, inlined function. As long as we don't call any other functions
when building the arguments, there should be no overhead.
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
---
include/exec/memory.h | 15 +++++++++++++++
softmmu/memory.c | 13 +++++++++++++
2 files changed, 28 insertions(+)
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 307e527835..2ec3b597f1 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -47,6 +47,21 @@
OBJECT_GET_CLASS(IOMMUMemoryRegionClass, (obj), \
TYPE_IOMMU_MEMORY_REGION)
+#ifdef CONFIG_FUZZ
+void fuzz_dma_read_cb(size_t addr,
+ size_t len,
+ MemoryRegion *mr,
+ bool is_write);
+#else
+static inline void fuzz_dma_read_cb(size_t addr,
+ size_t len,
+ MemoryRegion *mr,
+ bool is_write)
+{
+ /* Do Nothing */
+}
+#endif
+
extern bool global_dirty_log;
typedef struct MemoryRegionOps MemoryRegionOps;
diff --git a/softmmu/memory.c b/softmmu/memory.c
index af25987518..b0c2cf2535 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -3223,6 +3223,19 @@ void memory_region_init_rom_device(MemoryRegion *mr,
vmstate_register_ram(mr, owner_dev);
}
+/*
+ * Support softmmu builds with CONFIG_FUZZ using a weak symbol and a stub for
+ * the fuzz_dma_read_cb callback
+ */
+#ifdef CONFIG_FUZZ
+void __attribute__((weak)) fuzz_dma_read_cb(size_t addr,
+ size_t len,
+ MemoryRegion *mr,
+ bool is_write)
+{
+}
+#endif
+
static const TypeInfo memory_region_info = {
.parent = TYPE_OBJECT,
.name = TYPE_MEMORY_REGION,
--
2.27.0
- [PATCH 00/12] Add a General Virtual Device Fuzzer, Alexander Bulekov, 2020/07/22
- [PATCH 01/12] fuzz: Change the way we write qtest log to stderr, Alexander Bulekov, 2020/07/22
- [PATCH 02/12] fuzz: Add general virtual-device fuzzer, Alexander Bulekov, 2020/07/22
- [PATCH 03/12] fuzz: Add PCI features to the general fuzzer, Alexander Bulekov, 2020/07/22
- [PATCH 04/12] fuzz: Add DMA support to the generic-fuzzer, Alexander Bulekov, 2020/07/22
- [PATCH 05/12] fuzz: Declare DMA Read callback function,
Alexander Bulekov <=
- [PATCH 06/12] fuzz: Add fuzzer callbacks to DMA-read functions, Alexander Bulekov, 2020/07/22
- [PATCH 07/12] scripts/oss-fuzz: Add wrapper program for generic fuzzer, Alexander Bulekov, 2020/07/22
- [PATCH 08/12] scripts/oss-fuzz: Add general-fuzzer build script, Alexander Bulekov, 2020/07/22
- [PATCH 09/12] scripts/oss-fuzz: Add general-fuzzer configs for oss-fuzz, Alexander Bulekov, 2020/07/22
- [PATCH 10/12] scripts/oss-fuzz: build the general-fuzzer configs, Alexander Bulekov, 2020/07/22
- [PATCH 11/12] scripts/oss-fuzz: Add script to reorder a general-fuzzer trace, Alexander Bulekov, 2020/07/22
- [PATCH 12/12] scripts/oss-fuzz: Add crash trace minimization script, Alexander Bulekov, 2020/07/22