pkg/ldd: filter dependencies without a filesystem path

In some cases the interpreter returns dependencies without
a filesystem path, e.g.:

linux-vdso.so.1 => (0x00007ffe4972d000)

Those dependencies should be skipt.

Signed-off-by: Florian Gläßer <florian.glaesser@code-intelligence.com>

pkg/ldd/ldd_unix.go

@@ -80,6 +80,13 @@ func parseinterp(input string) ([]string, error) {
 		if f[0] == f[2] {
 			continue
 		}
+		// If the third part is a memory address
+		// instead of a file system path,
+		// the entry should be skipped. For example:
+		// linux-vdso.so.1 => (0x00007ffe4972d000),
+		if f[1] == "=>" && string(f[2][0]) == "(" {
+			continue
+		}
 		names = append(names, f[2])
 	}
 	return names, nil

pkg/ldd/ldd_unix_test.go

@@ -34,6 +34,11 @@ var (
 	/lib64/ld-linux-x86-64.so.2 => /usr/lib64/ld-linux-x86-64.so.2`,
 			output: []string{"/usr/lib/libc.so.6", "/usr/lib64/ld-linux-x86-64.so.2"},
 		},
+		{
+			name:   "entry with memory address",
+			input:  `linux-vdso.so.1 => (0x00007ffe4972d000)`,
+			output: []string{},
+		},
 	}
 )