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/*
* Copyright 2021 Google LLC
* SPDX-License-Identifier: MIT
*/
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include "util/macros.h"
#include "virglrenderer.h"
#include "virglrenderer_hw.h"
int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
struct fuzz_renderer {
bool initialized;
};
static void
fuzz_atexit_callback(void)
{
virgl_renderer_cleanup(NULL);
}
static void
fuzz_debug_callback(UNUSED const char *fmt, UNUSED va_list ap)
{
/* no logging */
}
static void
fuzz_write_context_fence(UNUSED void *cookie,
UNUSED uint32_t ctx_id,
UNUSED uint32_t ring_idx,
UNUSED uint64_t fence_id)
{
}
static struct virgl_renderer_callbacks callbacks = {
.version = 3,
.write_context_fence = fuzz_write_context_fence,
};
static struct fuzz_renderer *
fuzz_renderer_get(void)
{
static struct fuzz_renderer renderer;
if (renderer.initialized)
return &renderer;
int flags = VIRGL_RENDERER_NO_VIRGL | VIRGL_RENDERER_DRM |
VIRGL_RENDERER_ASYNC_FENCE_CB;
int ret =
virgl_renderer_init(NULL, flags, &callbacks);
if (ret)
abort();
virgl_set_debug_callback(fuzz_debug_callback);
atexit(fuzz_atexit_callback);
renderer.initialized = true;
return &renderer;
}
static uint32_t
fuzz_context_create(UNUSED struct fuzz_renderer *renderer)
{
const uint32_t ctx_id = 1;
const char name[] = "virgl_drm_fuzzer";
int ret = virgl_renderer_context_create_with_flags(ctx_id, VIRGL_RENDERER_CAPSET_DRM,
sizeof(name), name);
if (ret)
abort();
return ctx_id;
}
static void
fuzz_context_destroy(UNUSED struct fuzz_renderer *renderer, uint32_t ctx_id)
{
virgl_renderer_context_destroy(ctx_id);
}
static void
fuzz_context_submit(UNUSED struct fuzz_renderer *renderer,
uint32_t ctx_id,
const uint8_t *data,
size_t size)
{
/* We'll not be able to hit some codepaths without shmem buffer setup..
* but we'd also like to hit any potential errors that could come from
* malicious input before shmem is setup. So run the same input twice,
* once before and once after shmem setup.
*/
virgl_renderer_submit_cmd((void *)data, ctx_id, size / 4);
virgl_renderer_resource_create_blob(&(struct virgl_renderer_resource_create_blob_args){
.res_handle = 1,
.ctx_id = ctx_id,
.size = 0x1000,
});
virgl_renderer_submit_cmd((void *)data, ctx_id, size / 4);
}
int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
struct fuzz_renderer *renderer = fuzz_renderer_get();
const uint32_t ctx_id = fuzz_context_create(renderer);
fuzz_context_submit(renderer, ctx_id, data, size);
fuzz_context_destroy(renderer, ctx_id);
return 0;
}
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