fix(redhat): save contentSets for OS packages in fs/vm modes (aquasecurity#8820)

Author: DmitriyLewen

docs/docs/advanced/container/unpacked-filesystem.md

@@ -113,4 +113,4 @@ Total: 20 (UNKNOWN: 0, LOW: 2, MEDIUM: 10, HIGH: 8, CRITICAL: 0)
 +--------------+------------------+----------+-------------------+---------------+---------------------------------------+
 ```
 
-</details>
+</details>

docs/docs/coverage/os/rhel.md

@@ -22,6 +22,13 @@ Trivy detects packages that have been installed through package managers such as
 ## Vulnerability
 Red Hat offers its own security advisories, and these are utilized when scanning Red Hat Enterprise Linux (RHEL) for vulnerabilities.
 
+### Content manifests
+Red Hat’s security advisories use CPEs to identify product sets. For example, even packages installed in the same container image can have different CPEs. 
+For this reason, Red Hat’s container images include stored content manifests, which we convert to CPEs, and perform vulnerability scanning.
+
+Since this system ties each content manifest to its packages on a per-layer basis, 
+if layers get merged (for instance, by using `docker run` or `docker export`) we can no longer determine the correct CPE, which may lead to false detection.
+
 ### Data Source
 See [here](../../scanner/vulnerability.md#data-sources).
 
@@ -82,3 +89,5 @@ Trivy identifies licenses by examining the metadata of RPM packages.
 [NVD]: https://nvd.nist.gov/vuln/detail/CVE-2023-0464
 
 [vulnerability statuses]: ../../configuration/filtering.md#by-status
+
+[content-set-default]: https://github.com/aquasecurity/trivy/blob/c80310d7690d8aeb7d3d77416c18c0c8b9aebe17/pkg/detector/ospkg/redhat/redhat.go#L25-L42

docs/docs/target/rootfs.md

@@ -14,6 +14,9 @@ $ trivy rootfs /path/to/rootfs
     You should use `trivy fs` to scan your local projects in CI/CD.
     See [here](../scanner/vulnerability.md) for the differences.
 
+!!! note
+    Scanning vulnerabilities for `Red Hat` has a limitation, see the [Red Hat](../coverage/os/rhel.md#content-manifests) page for details.
+
 ## Performance Optimization
 
 By default, Trivy traverses all files from the specified root directory to find target files for scanning.

docs/docs/target/vm.md

@@ -150,6 +150,9 @@ See [here](../scanner/vulnerability.md) for the detail.
 $ trivy vm [YOUR_VM_IMAGE]
 ```
 
+!!! note
+    Scanning `Red Hat` has a limitation, see the [Red Hat](../coverage/os/rhel.md#content-manifests) page for details.
+
 ### Misconfigurations
 It is supported, but it is not useful in most cases.
 As mentioned [here](../scanner/misconfiguration/index.md), Trivy mainly supports Infrastructure as Code (IaC) files for misconfigurations.

pkg/fanal/artifact/local/fs.go

@@ -207,6 +207,9 @@ func (a Artifact) Inspect(ctx context.Context) (artifact.Reference, error) {
 		Secrets:           result.Secrets,
 		Licenses:          result.Licenses,
 		CustomResources:   result.CustomResources,
+
+		// For Red Hat
+		BuildInfo: result.BuildInfo,
 	}
 
 	if err = a.handlerManager.PostHandle(ctx, result, &blobInfo); err != nil {

pkg/fanal/artifact/vm/vm.go

@@ -157,6 +157,9 @@ func (a *Storage) Analyze(ctx context.Context, r *io.SectionReader) (types.BlobI
 		Secrets:         result.Secrets,
 		Licenses:        result.Licenses,
 		CustomResources: result.CustomResources,
+
+		// For Red Hat
+		BuildInfo: result.BuildInfo,
 	}
 
 	if err = a.handlerManager.PostHandle(ctx, result, &blobInfo); err != nil {