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authorJohn Johansen <john.johansen@canonical.com>2014-10-24 20:16:14 +0400
committerJohn Johansen <john.johansen@canonical.com>2016-07-12 18:43:10 +0300
commit6059f71f1e94486a51cef90e872add11fa7b5775 (patch)
treeab2c3f7e887584e678843347030f35aab7828074 /security
parentbd35db8b8ca6e27fc17a9057ef78e1ddfc0de351 (diff)
downloadlinux-6059f71f1e94486a51cef90e872add11fa7b5775.tar.xz
apparmor: add parameter to control whether policy hashing is used
Signed-off-by: John Johansen <john.johansen@canonical.com> Acked-by: Tyler Hicks <tyhicks@canonical.com> Acked-by: Seth Arnold <seth.arnold@canonical.com>
Diffstat (limited to 'security')
-rw-r--r--security/apparmor/Kconfig21
-rw-r--r--security/apparmor/include/apparmor.h1
-rw-r--r--security/apparmor/lsm.c4
-rw-r--r--security/apparmor/policy_unpack.c5
4 files changed, 25 insertions, 6 deletions
diff --git a/security/apparmor/Kconfig b/security/apparmor/Kconfig
index 232469baa94f..be5e9414a295 100644
--- a/security/apparmor/Kconfig
+++ b/security/apparmor/Kconfig
@@ -31,13 +31,26 @@ config SECURITY_APPARMOR_BOOTPARAM_VALUE
If you are unsure how to answer this question, answer 1.
config SECURITY_APPARMOR_HASH
- bool "SHA1 hash of loaded profiles"
+ bool "Enable introspection of sha1 hashes for loaded profiles"
depends on SECURITY_APPARMOR
select CRYPTO
select CRYPTO_SHA1
default y
help
- This option selects whether sha1 hashing is done against loaded
- profiles and exported for inspection to user space via the apparmor
- filesystem.
+ This option selects whether introspection of loaded policy
+ is available to userspace via the apparmor filesystem.
+
+config SECURITY_APPARMOR_HASH_DEFAULT
+ bool "Enable policy hash introspection by default"
+ depends on SECURITY_APPARMOR_HASH
+ default y
+
+ help
+ This option selects whether sha1 hashing of loaded policy
+ is enabled by default. The generation of sha1 hashes for
+ loaded policy provide system administrators a quick way
+ to verify that policy in the kernel matches what is expected,
+ however it can slow down policy load on some devices. In
+ these cases policy hashing can be disabled by default and
+ enabled only if needed.
diff --git a/security/apparmor/include/apparmor.h b/security/apparmor/include/apparmor.h
index e4ea62663866..5d721e990876 100644
--- a/security/apparmor/include/apparmor.h
+++ b/security/apparmor/include/apparmor.h
@@ -37,6 +37,7 @@
extern enum audit_mode aa_g_audit;
extern bool aa_g_audit_header;
extern bool aa_g_debug;
+extern bool aa_g_hash_policy;
extern bool aa_g_lock_policy;
extern bool aa_g_logsyscall;
extern bool aa_g_paranoid_load;
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 2660fbcf94d1..656b97c2e1ea 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -669,6 +669,10 @@ enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
module_param_call(mode, param_set_mode, param_get_mode,
&aa_g_profile_mode, S_IRUSR | S_IWUSR);
+/* whether policy verification hashing is enabled */
+bool aa_g_hash_policy = CONFIG_SECURITY_APPARMOR_HASH_DEFAULT;
+module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
+
/* Debug mode */
bool aa_g_debug;
module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
index a689f10930b5..a55fb2f170c9 100644
--- a/security/apparmor/policy_unpack.c
+++ b/security/apparmor/policy_unpack.c
@@ -775,8 +775,9 @@ int aa_unpack(void *udata, size_t size, struct list_head *lh, const char **ns)
if (error)
goto fail_profile;
- error = aa_calc_profile_hash(profile, e.version, start,
- e.pos - start);
+ if (aa_g_hash_policy)
+ error = aa_calc_profile_hash(profile, e.version, start,
+ e.pos - start);
if (error)
goto fail_profile;