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/prio.go | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'prog/prio.go') diff --git a/prog/prio.go b/prog/prio.go index d0013b75d..535999c1a 100644 --- a/prog/prio.go +++ b/prog/prio.go @@ -96,7 +96,7 @@ func (target *Target) calcResourceUsage() map[string]map[int]weights { } case *BufferType: switch a.Kind { - case BufferBlobRand, BufferBlobRange, BufferText: + case BufferBlobRand, BufferBlobRange, BufferText, BufferCompressed: case BufferString, BufferGlob: if a.SubKind != "" { noteUsage(uses, c, 2, ctx.Dir, fmt.Sprintf("str-%v", a.SubKind)) -- cgit mrf-deployment