pmbootstrap kconfig check: add apparmor check (MR 2133)

SECURITY_APPARMOR_BOOTPARAM_VALUE was required to enable it by default
until 5.1 where the option was removed.

Related: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=0102fb83f90050b86ce37aec810ea17bb4448e0c
Related: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/security/Kconfig?id=fe91c4725aeed35023ba4f7a1e1adfebb6878c23#n285

pmb/config/__init__.py

@@ -332,6 +332,26 @@ necessary_kconfig_options_anbox = {
     }
 }
 
+# Necessary apparmor kernel config options (mandatory access control)
+# LSM: the value that "config LSM" sets in security/Kconfig, if
+# DEFAULT_SECURITY_APPARMOR is set (and other DEFAULT_SECURITY_* are unset).
+necessary_kconfig_options_apparmor = {
+    ">=0.0.0": {  # all versions
+        "all": {  # all arches
+            "AUDIT": True,
+            "DEFAULT_SECURITY_APPARMOR": True,
+            "LSM": "landlock,lockdown,yama,loadpin,safesetid,integrity,"
+                   "apparmor,selinux,smack,tomoyo,bpf",
+            "SECURITY_APPARMOR": True,
+        },
+    },
+    "<5.1": {
+        "all": {
+            "SECURITY_APPARMOR_BOOTPARAM_VALUE": True,
+        },
+    },
+}
+
 # Necessary nftables kernel config options
 necessary_kconfig_options_nftables = {
     ">=3.13.0": {  # nftables support introduced here

pmb/helpers/frontend.py

@@ -403,6 +403,7 @@ def kconfig(args):
             if not pmb.parse.kconfig.check(
                     args, package,
                     force_anbox_check=args.anbox,
+                    force_apparmor_check=args.apparmor,
                     force_nftables_check=args.nftables,
                     force_containers_check=args.containers,
                     force_zram_check=args.zram,

pmb/parse/arguments.py

@@ -434,6 +434,8 @@ def arguments_kconfig(subparser):
                        " directly instead of a config in a package")
     check.add_argument("--anbox", action="store_true", help="check"
                        " options needed for anbox too")
+    check.add_argument("--apparmor", action="store_true", help="check"
+                       " options needed for apparmor too")
     check.add_argument("--nftables", action="store_true", help="check"
                        " options needed for nftables too")
     check.add_argument("--containers", action="store_true",

pmb/parse/kconfig.py

@@ -86,6 +86,7 @@ def check_option(component, details, config, config_path_pretty, option,
 
 def check_config(config_path, config_path_pretty, config_arch, pkgver,
                  anbox=False,
+                 apparmor=False,
                  nftables=False,
                  containers=False,
                  zram=False,
@@ -97,6 +98,8 @@ def check_config(config_path, config_path_pretty, config_arch, pkgver,
     components = {"postmarketOS": pmb.config.necessary_kconfig_options}
     if anbox:
         components["anbox"] = pmb.config.necessary_kconfig_options_anbox
+    if apparmor:
+        components["apparmor"] = pmb.config.necessary_kconfig_options_apparmor
     if nftables:
         components["nftables"] = pmb.config.necessary_kconfig_options_nftables
     if containers:
@@ -148,6 +151,7 @@ def check_config_options_set(config, config_path_pretty, config_arch, options,
 
 def check(args, pkgname,
           force_anbox_check=False,
+          force_apparmor_check=False,
           force_nftables_check=False,
           force_containers_check=False,
           force_zram_check=False,
@@ -172,6 +176,8 @@ def check(args, pkgname,
     pkgver = apkbuild["pkgver"]
     check_anbox = force_anbox_check or (
         "pmb:kconfigcheck-anbox" in apkbuild["options"])
+    check_apparmor = force_apparmor_check or (
+        "pmb:kconfigcheck-apparmor" in apkbuild["options"])
     check_nftables = force_nftables_check or (
         "pmb:kconfigcheck-nftables" in apkbuild["options"])
     check_containers = force_containers_check or (
@@ -186,6 +192,7 @@ def check(args, pkgname,
         ret &= check_config(config_path, config_path_pretty, config_arch,
                             pkgver,
                             anbox=check_anbox,
+                            apparmor=check_apparmor,
                             nftables=check_nftables,
                             containers=check_containers,
                             zram=check_zram,