diff options
| author | Michael Pratt <mpratt@google.com> | 2021-07-30 13:39:18 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2021-07-30 13:42:15 -0700 |
| commit | 62ea5c0a2212b9827f093551fc3da166facb9f0b (patch) | |
| tree | e26283ab57a11a34202cc731da4270c53c418951 /pkg/procid/procid_amd64.s | |
| parent | 095b0d8348531b96f1b40885c00d6cd7f07ecf80 (diff) | |
checklinkname: rudimentary type-checking of linkname directives
This CL introduces a 'checklinkname' analyzer, which provides rudimentary
type-checking that verifies that function signatures on the local and remote
sides of //go:linkname directives match expected values.
If the Go standard library changes the definitions of any of these function,
checklinkname will flag the change as a finding, providing an error informing
the gVisor team to adapt to the upstream changes. This allows us to eliminate
the majority of gVisor's forward-looking negative build tags, as we can catch
mismatches in testing [1].
The remaining forward-looking negative build tags are covering shared struct
definitions, which I hope to add to checklinkname in a future CL.
[1] Of course, semantics/requirements can change without the signature
changing, so we still must be careful, but this covers the common case.
PiperOrigin-RevId: 387873847
Diffstat (limited to 'pkg/procid/procid_amd64.s')
| -rw-r--r-- | pkg/procid/procid_amd64.s | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/pkg/procid/procid_amd64.s b/pkg/procid/procid_amd64.s index b5bbfff90..74a8de42c 100644 --- a/pkg/procid/procid_amd64.s +++ b/pkg/procid/procid_amd64.s @@ -15,6 +15,10 @@ //go:build amd64 && go1.8 && !go1.18 && go1.1 // +build amd64,go1.8,!go1.18,go1.1 +// //go:linkname directives type-checked by checklinkname. Any other +// non-linkname assumptions outside the Go 1 compatibility guarantee should +// have an accompanied vet check or version guard build tag. + #include "textflag.h" TEXT ·Current(SB),NOSPLIT,$0-8 |