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| author | John Johansen <john.johansen@canonical.com> | 2014-10-24 09:16:14 -0700 |
|---|---|---|
| committer | John Johansen <john.johansen@canonical.com> | 2016-07-12 08:43:10 -0700 |
| commit | 6059f71f1e94486a51cef90e872add11fa7b5775 (patch) | |
| tree | ab2c3f7e887584e678843347030f35aab7828074 /security/apparmor | |
| parent | bd35db8b8ca6e27fc17a9057ef78e1ddfc0de351 (diff) | |
| download | lwn-6059f71f1e94486a51cef90e872add11fa7b5775.tar.gz lwn-6059f71f1e94486a51cef90e872add11fa7b5775.zip | |
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/apparmor')
| -rw-r--r-- | security/apparmor/Kconfig | 21 | ||||
| -rw-r--r-- | security/apparmor/include/apparmor.h | 1 | ||||
| -rw-r--r-- | security/apparmor/lsm.c | 4 | ||||
| -rw-r--r-- | security/apparmor/policy_unpack.c | 5 |
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; |