diff options
| author | Hrutvik Kanabar <hrutvik@google.com> | 2022-10-25 10:13:51 +0000 |
|---|---|---|
| committer | Aleksandr Nogikh <wp32pw@gmail.com> | 2022-11-21 11:06:14 +0100 |
| commit | d0405298b24db0e2a6b2abfdc8c7e5ebbe49d1a0 (patch) | |
| tree | c022669ce377e0c09376d60b45a01584c67c0989 /prog/analysis.go | |
| parent | 7954d07c228dd9ce63b7ebd13239b4d1f2c35233 (diff) | |
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.
Diffstat (limited to 'prog/analysis.go')
| -rw-r--r-- | prog/analysis.go | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/prog/analysis.go b/prog/analysis.go index 04f0b270a..b4a30dbe8 100644 --- a/prog/analysis.go +++ b/prog/analysis.go @@ -76,7 +76,8 @@ func (s *state) analyzeImpl(c *Call, resources bool) { } case *BufferType: a := arg.(*DataArg) - if a.Dir() != DirOut && len(a.Data()) != 0 { + if a.Dir() != DirOut && len(a.Data()) != 0 && + (typ.Kind == BufferString || typ.Kind == BufferFilename) { val := string(a.Data()) // Remove trailing zero padding. for len(val) >= 2 && val[len(val)-1] == 0 && val[len(val)-2] == 0 { |