vm/gvisor: add gvisor presubmit test

Download the latest gvisor release and run the syz-manager smoke-test
suite.

Signed-off-by: Andrei Vagin <avagin@google.com>

4 files changed, 70 insertions, 0 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 48bd1078b..17b38a401 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -186,3 +186,23 @@ jobs:
         run: |
           cd gopath/src/github.com/google/syzkaller
           .github/workflows/run.sh make presubmit_old
+  gvisor:
+    runs-on: ubuntu-latest
+    container:
+      image: gcr.io/syzkaller/syzbot:latest
+      options: --privileged
+    env:
+      GOPATH: /__w/syzkaller/syzkaller/gopath
+      CI: true
+      TERM: dumb
+      GITHUB_ACTIONS: true
+    steps:
+      - name: checkout
+        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
+        with:
+          path: gopath/src/github.com/google/syzkaller
+      - name: run
+        run: |
+          cd gopath/src/github.com/google/syzkaller
+          make
+          .github/workflows/run.sh bash -xe tools/gvisor-smoke-test.sh
diff --git a/Makefile b/Makefile
index 51f53a032..7d6295913 100644
--- a/Makefile
+++ b/Makefile
@@ -382,6 +382,9 @@ presubmit_old: descriptions
 	TARGETARCH=mips64le TARGETVMARCH=mips64le $(MAKE) target
 	TARGETARCH=s390x TARGETVMARCH=s390x $(MAKE) target
 
+presubmit_gvisor: host target
+	./tools/gvisor-smoke-test.sh
+
 test: descriptions
 	$(GO) test -short -coverprofile=.coverage.txt ./...
 
diff --git a/pkg/vminfo/linux.go b/pkg/vminfo/linux.go
index 030b9a038..d6b83ef2f 100644
--- a/pkg/vminfo/linux.go
+++ b/pkg/vminfo/linux.go
@@ -34,6 +34,7 @@ func (linux) checkFiles() []string {
 		"/proc/version",
 		"/proc/filesystems",
 		"/sys/kernel/security/lsm",
+		"/proc/sentry-meminfo",
 	}
 }
 
@@ -45,6 +46,11 @@ func (linux) machineInfos() []machineInfoFunc {
 }
 
 func (linux) parseModules(files filesystem) ([]*cover.KernelModule, error) {
+	_, err := files.ReadFile("/proc/sentry-meminfo")
+	if err == nil {
+		// This is gVisor.
+		return nil, nil
+	}
 	var modules []*cover.KernelModule
 	re := regexp.MustCompile(`(\w+) ([0-9]+) .*(0[x|X][a-fA-F0-9]+)[^\n]*`)
 	modulesText, _ := files.ReadFile("/proc/modules")
diff --git a/tools/gvisor-smoke-test.sh b/tools/gvisor-smoke-test.sh
new file mode 100755
index 000000000..fdc75f64a
--- /dev/null
+++ b/tools/gvisor-smoke-test.sh
@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# Copyright 2024 syzkaller project authors. All rights reserved.
+# Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+set -xe -o pipefail
+
+workdir="$(mktemp -d /tmp/syzkaller-gvisor-test.XXXXXX)"
+
+cleanup() {
+  sudo -E rm -rf "$workdir"
+}
+
+trap cleanup EXIT
+
+syzdir="$(pwd)"
+cat > "$workdir/config" <<EOF
+{
+        "name": "gvisor",
+        "target": "linux/amd64",
+        "http": ":54321",
+        "workdir": "/$workdir/workdir/",
+        "image": "$workdir/kernel/vmlinux",
+        "kernel_obj": "$workdir/kernel/",
+        "syzkaller": "$syzdir",
+        "cover": false,
+        "procs": 1,
+        "type": "gvisor",
+        "vm": {
+                "count": 1,
+                "runsc_args": "--ignore-cgroups --network none"
+        }
+}
+EOF
+
+arch="$(uname -m)"
+url="https://storage.googleapis.com/gvisor/releases/release/latest/${arch}"
+mkdir "$workdir/kernel"
+curl --output "$workdir/kernel/vmlinux" "${url}/runsc"
+chmod a+rx "$workdir/kernel/vmlinux"
+
+sudo -E ./bin/syz-manager -config "$workdir/config" --mode smoke-test