On Sat, Feb 17, 2024, 18:49 Michael Niedermayer <mich...@niedermayer.cc>
wrote:
> Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
> ---
> Makefile | 3 +
> tools/Makefile | 3 +
> tools/target_sws_fuzzer.c | 168 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 174 insertions(+)
> create mode 100644 tools/target_sws_fuzzer.c
>
> diff --git a/Makefile b/Makefile
> index dbc930270b3..b309dbc4db9 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -64,6 +64,9 @@ tools/target_dem_fuzzer$(EXESUF):
> tools/target_dem_fuzzer.o $(FF_DEP_LIBS)
> tools/target_io_dem_fuzzer$(EXESUF): tools/target_io_dem_fuzzer.o
> $(FF_DEP_LIBS)
> $(LD) $(LDFLAGS) $(LDEXEFLAGS) $(LD_O) $^ $(ELIBS) $(FF_EXTRALIBS)
> $(LIBFUZZER_PATH)
>
> +tools/target_sws_fuzzer$(EXESUF): tools/target_sws_fuzzer.o $(FF_DEP_LIBS)
> + $(LD) $(LDFLAGS) $(LDEXEFLAGS) $(LD_O) $^ $(ELIBS) $(FF_EXTRALIBS)
> $(LIBFUZZER_PATH)
> +
>
> tools/enum_options$(EXESUF): ELIBS = $(FF_EXTRALIBS)
> tools/enum_options$(EXESUF): $(FF_DEP_LIBS)
> diff --git a/tools/Makefile b/tools/Makefile
> index dee6a416688..72e8e709a8d 100644
> --- a/tools/Makefile
> +++ b/tools/Makefile
> @@ -17,6 +17,9 @@ tools/target_dem_fuzzer.o: tools/target_dem_fuzzer.c
> tools/target_io_dem_fuzzer.o: tools/target_dem_fuzzer.c
> $(COMPILE_C) -DIO_FLAT=0
>
> +tools/target_sws_fuzzer.o: tools/target_sws_fuzzer.c
> + $(COMPILE_C)
> +
> tools/enc_recon_frame_test$(EXESUF): tools/decode_simple.o
> tools/venc_data_dump$(EXESUF): tools/decode_simple.o
> tools/scale_slice_test$(EXESUF): tools/decode_simple.o
> diff --git a/tools/target_sws_fuzzer.c b/tools/target_sws_fuzzer.c
> new file mode 100644
> index 00000000000..babb6e81629
> --- /dev/null
> +++ b/tools/target_sws_fuzzer.c
> @@ -0,0 +1,168 @@
> +/*
> + * Copyright (c) 2024 Michael Niedermayer <michael-ffm...@niedermayer.cc>
> + *
> + * This file is part of FFmpeg.
> + *
> + * FFmpeg is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * FFmpeg is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with FFmpeg; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
> 02110-1301 USA
> + */
> +
> +#include "config.h"
> +#include "libavutil/avassert.h"
> +#include "libavutil/avstring.h"
> +#include "libavutil/cpu.h"
> +#include "libavutil/imgutils.h"
> +#include "libavutil/intreadwrite.h"
> +#include "libavutil/opt.h"
> +
> +#include "libavcodec/bytestream.h"
> +
> +#include "libswscale/swscale.h"
> +
> +
> +int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
> +
> +static void error(const char *err)
> +{
> + fprintf(stderr, "%s", err);
> + exit(1);
> +}
> +
> +static int alloc_plane(uint8_t *data[AV_VIDEO_MAX_PLANES], int
> stride[AV_VIDEO_MAX_PLANES], int w, int h, int format, int *hshift, int
> *vshift)
> +{
> + int ret = av_image_fill_linesizes(stride, format, w);
> + if (ret < 0)
> + return -1;
> +
> + av_pix_fmt_get_chroma_sub_sample(format, hshift, vshift);
> +
> + for(int p=0; p<AV_VIDEO_MAX_PLANES; p++) {
> + if (stride[p]) {
> + stride[p] = FFALIGN(stride[p], 32);
> + int ph = AV_CEIL_RSHIFT(h, (p == 1 || p == 2) ? *vshift : 0);
> + av_log(0,0, "P:%d St %d ph %d\n", p, stride[p], ph);
> + data[p] = av_mallocz(stride[p] * ph + 32);
> + if (!data[p])
> + return -1;
> + }
> + }
> + if (format == AV_PIX_FMT_PAL8) {
> + data[1] = av_mallocz(256*4);
> + if (!data[1])
> + return -1;
> + }
> + return 0;
> +}
> +
> +static void free_plane(uint8_t *data[AV_VIDEO_MAX_PLANES])
> +{
> + for(int p=0; p<AV_VIDEO_MAX_PLANES; p++)
> + av_freep(&data[p]);
> +}
> +
> +int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
> + int srcW= 48, srcH = 48;
> + int dstW= 48, dstH = 48;
> + int srcHShift, srcVShift;
> + int dstHShift, dstVShift;
> + unsigned flags = 1;
> + int srcStride[AV_VIDEO_MAX_PLANES] = {0};
> + int dstStride[AV_VIDEO_MAX_PLANES] = {0};
> + int ret;
> + const uint8_t *end = data + size;
> + enum AVPixelFormat srcFormat = AV_PIX_FMT_YUV420P;
> + enum AVPixelFormat dstFormat = AV_PIX_FMT_YUV420P;
> + uint8_t *src[4] = { 0 };
> + uint8_t *dst[4] = { 0 };
> + struct SwsContext *sws = NULL;
> + const AVPixFmtDescriptor *desc_src, *desc_dst;
> +
> + if (size > 128) {
> + GetByteContext gbc;
> + int64_t flags64;
> +
> + size -= 128;
> + bytestream2_init(&gbc, data + size, 128);
> + srcW = bytestream2_get_le32(&gbc) % 256;
> + srcH = bytestream2_get_le32(&gbc) % 256;
> + dstW = bytestream2_get_le32(&gbc) % 256;
> + dstH = bytestream2_get_le32(&gbc) % 256;
> + flags = bytestream2_get_le32(&gbc);
> +
> + srcFormat = bytestream2_get_le32(&gbc) % AV_PIX_FMT_NB;
> + dstFormat = bytestream2_get_le32(&gbc) % AV_PIX_FMT_NB;
> +
> + flags64 = bytestream2_get_le64(&gbc);
> + if (flags64 & 0x10)
> + av_force_cpu_flags(0);
> +
> + if (av_image_check_size(srcW, srcH, srcFormat, NULL))
> + srcW = srcH = 123;
> + if (av_image_check_size(dstW, dstH, dstFormat, NULL))
> + dstW = dstH = 123;
> + //TODO alphablend
> + }
> +
> + desc_src = av_pix_fmt_desc_get(srcFormat);
> + desc_dst = av_pix_fmt_desc_get(dstFormat);
> +
> + ret = alloc_plane(src, srcStride, srcW, srcH, srcFormat, &srcHShift,
> &srcVShift);
> + if (ret < 0)
> + goto end;
> +
> + ret = alloc_plane(dst, dstStride, dstW, dstH, dstFormat, &dstHShift,
> &dstVShift);
> + if (ret < 0)
> + goto end;
> +
> +
> + for(int p=0; p<AV_VIDEO_MAX_PLANES; p++) {
> + int psize = srcStride[p] * AV_CEIL_RSHIFT(srcH, (p == 1 || p ==
> 2) ? srcVShift : 0);
> + if (psize > size)
> + psize = size;
> + if (psize) {
> + memcpy(src[p], data, psize);
> + data += psize;
> + size -= psize;
> + }
> + }
> +
> + sws = sws_alloc_context();
> + if (!sws)
> + error("Failed sws allocation");
> +
> + av_opt_set_int(sws, "sws_flags", flags, 0);
> + av_opt_set_int(sws, "srcw", srcW, 0);
> + av_opt_set_int(sws, "srch", srcH, 0);
> + av_opt_set_int(sws, "dstw", dstW, 0);
> + av_opt_set_int(sws, "dsth", dstH, 0);
> + av_opt_set_int(sws, "src_format", srcFormat, 0);
> + av_opt_set_int(sws, "dst_format", dstFormat, 0);
> + av_opt_set(sws, "alphablend", "none", 0);
> +
> + ret = sws_init_context(sws, NULL, NULL);
> + if (ret < 0)
> + goto end;
> +
> + fprintf(stderr, "%d x %d %s -> %d x %d %s\n", srcW, srcH,
> desc_src->name, dstW, dstH, desc_dst->name);
> + //TODO Slices
> + sws_scale(sws, (const uint8_t * const*)src, srcStride, 0, srcH, dst,
> dstStride);
> +
> +end:
> + sws_freeContext(sws);
> +
> + free_plane(src);
> + free_plane(dst);
> +
> + return 0;
> +}
> --
> 2.17.1
>
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>
I don't see anything intrinsically wrong with this other than:
- is this compiler-backend specific? Does it work without LLVM?
- would it ever be useful to redirect the output of error() to another fd?
In which case maybe a convenience method that defaults to stderr would be
appropriate?
-- Sean McGovern
>
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