From d0405298b24db0e2a6b2abfdc8c7e5ebbe49d1a0 Mon Sep 17 00:00:00 2001 From: Hrutvik Kanabar Date: Tue, 25 Oct 2022 10:13:51 +0000 Subject: prog, pkg/compiler: add `BufferCompressed` buffer type & `compressed_image` builtin Create the `BufferCompressed` kind of `BufferType`, which will be used to represent compressed data. Create the corresponding `compressed_image` syzlang builtin, which is backed by `BufferCompressed`. For now, no syscalls use this feature - this will be introduced in future commits. We have to be careful to decompress the data before mutating, and re-compress before storing. We make sure that any deserialised `BufferCompressed` data is valid too. `BufferCompressed` arguments are mutated using a generic heatmap. In future, we could add variants of `BufferCompressed` or populate the `BufferType` sub-kind, using it to choose different kinds of heatmap for different uncompressed data formats. Various operations on compressed data must be forbidden, so we check for `BufferCompressed` in key places. We also have to ensure `compressed_image` can only be used in syscalls that are marked `no_{generate,minimize}`. Therefore, we add a generic compiler check which allows type descriptions to require attributes on the syscalls which use them. --- prog/rand.go | 2 ++ 1 file changed, 2 insertions(+) (limited to 'prog/rand.go') diff --git a/prog/rand.go b/prog/rand.go index 8337e7af4..c91ffeee4 100644 --- a/prog/rand.go +++ b/prog/rand.go @@ -768,6 +768,8 @@ func (a *BufferType) generate(r *randGen, s *state, dir Dir) (arg Arg, calls []* return MakeOutDataArg(a, dir, uint64(r.Intn(100))), nil } return MakeDataArg(a, dir, r.generateText(a.Text)), nil + case BufferCompressed: + panic(fmt.Sprintf("can't generate compressed type %v", a)) default: panic("unknown buffer kind") } -- cgit mrf-deployment