fix(pkg): fixed mainline kernel URLs.

Moreover, properly enforce KBUILD_MODPOST_WARN in vanilla template.

Signed-off-by: Federico Di Pierro <nierro92@gmail.com>

Author: FedeDP

pkg/driverbuilder/builder/templates/vanilla.sh

@@ -36,6 +36,8 @@ make KCONFIG_CONFIG=/tmp/kernel.config oldconfig
 make KCONFIG_CONFIG=/tmp/kernel.config prepare
 make KCONFIG_CONFIG=/tmp/kernel.config modules_prepare
 
+export KBUILD_MODPOST_WARN=1
+
 {{ if .BuildModule }}
 # Build the kernel module
 cd {{ .DriverBuildDir }}
@@ -51,4 +53,4 @@ modinfo {{ .ModuleFullPath }}
 cd {{ .DriverBuildDir }}/bpf
 make KERNELDIR=/tmp/kernel
 ls -l probe.o
-{{ end }}
+{{ end }}

pkg/driverbuilder/builder/vanilla.go

@@ -54,7 +54,7 @@ func fetchVanillaKernelURLFromKernelVersion(kv kernelrelease.KernelRelease) stri
 	// and thus much quicker to download. Let's keep tar.xz for non RC!
 	// Numbers: 110M (tar.gz) vs 75M (tar.xz)
 	if isRC(kv) {
-		return fmt.Sprintf("https://git.kernel.org/torvalds/t/linux-%s%s.tar.gz", kv.Fullversion, kv.FullExtraversion)
+		return fmt.Sprintf("https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/snapshot/linux-%s%s.tar.gz", kv.Fullversion, kv.FullExtraversion)
 	}
 	return fmt.Sprintf("https://cdn.kernel.org/pub/linux/kernel/v%d.x/linux-%s.tar.xz", kv.Major, kv.Fullversion)
 }