elf: don't set BPF_F_MMAPABLE on .kconfig

We don't need to set the MMAPABLE flag on .kconfig section since the library never mmaps it. This allows using .kconfig on kernel >=5.2 instead of >=5.5. Signed-off-by: Lorenz Bauer <[email protected]>
cilium · Sep 11, 2023 · 0d9b9fb · 0d9b9fb
1 parent 01ebd4c
commit 0d9b9fb
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Showing 2 changed files with 3 additions and 2 deletions.
diff --git a/elf_reader.go b/elf_reader.go
@@ -1142,7 +1142,7 @@ func (ec *elfCode) loadKconfigSection() error {
 		KeySize:    uint32(4),
 		ValueSize:  ds.Size,
 		MaxEntries: 1,
-		Flags:      unix.BPF_F_RDONLY_PROG | unix.BPF_F_MMAPABLE,
+		Flags:      unix.BPF_F_RDONLY_PROG,
 		Freeze:     true,
 		Key:        &btf.Int{Size: 4},
 		Value:      ds,

diff --git a/elf_reader_test.go b/elf_reader_test.go
@@ -586,8 +586,9 @@ func TestKconfigKernelVersion(t *testing.T) {
 			Main *Program `ebpf:"kernel_version"`
 		}
 
+		testutils.SkipOnOldKernel(t, "5.2", "readonly maps")
+
 		err = spec.LoadAndAssign(&obj, nil)
-		testutils.SkipIfNotSupported(t, err)
 		if err != nil {
 			t.Fatal(err)
 		}