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[173.164.112.133]) by smtp.gmail.com with ESMTPSA id l16-v6sm27663155pfj.179.2018.10.01.17.55.10 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 01 Oct 2018 17:55:13 -0700 (PDT) From: Kees Cook To: James Morris Cc: Kees Cook , Casey Schaufler , John Johansen , Tetsuo Handa , Paul Moore , Stephen Smalley , "Schaufler, Casey" , LSM , Jonathan Corbet , linux-doc@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH security-next v4 05/32] LSM: Convert from initcall to struct lsm_info Date: Mon, 1 Oct 2018 17:54:38 -0700 Message-Id: <20181002005505.6112-6-keescook@chromium.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181002005505.6112-1-keescook@chromium.org> References: <20181002005505.6112-1-keescook@chromium.org> Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP In preparation for doing more interesting LSM init probing, this converts the existing initcall system into an explicit call into a function pointer from a section-collected struct lsm_info array. Signed-off-by: Kees Cook Reviewed-by: Casey Schaufler Reviewed-by: James Morris Reviewed-by: John Johansen --- include/linux/init.h | 2 -- include/linux/lsm_hooks.h | 12 ++++++++++++ include/linux/module.h | 1 - security/integrity/iint.c | 1 + security/security.c | 14 +++++--------- 5 files changed, 18 insertions(+), 12 deletions(-) diff --git a/include/linux/init.h b/include/linux/init.h index 77636539e77c..9c2aba1dbabf 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -133,7 +133,6 @@ static inline initcall_t initcall_from_entry(initcall_entry_t *entry) #endif extern initcall_entry_t __con_initcall_start[], __con_initcall_end[]; -extern initcall_entry_t __start_lsm_info[], __end_lsm_info[]; /* Used for contructor calls. */ typedef void (*ctor_fn_t)(void); @@ -236,7 +235,6 @@ extern bool initcall_debug; static exitcall_t __exitcall_##fn __exit_call = fn #define console_initcall(fn) ___define_initcall(fn,, .con_initcall) -#define security_initcall(fn) ___define_initcall(fn,, .lsm_info) struct obs_kernel_param { const char *str; diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index 97a020c616ad..d13059feca09 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -2039,6 +2039,18 @@ extern char *lsm_names; extern void security_add_hooks(struct security_hook_list *hooks, int count, char *lsm); +struct lsm_info { + int (*init)(void); /* Required. */ +}; + +extern struct lsm_info __start_lsm_info[], __end_lsm_info[]; + +#define security_initcall(lsm) \ + static struct lsm_info __lsm_##lsm \ + __used __section(.lsm_info.init) \ + __aligned(sizeof(unsigned long)) \ + = { .init = lsm, } + #ifdef CONFIG_SECURITY_SELINUX_DISABLE /* * Assuring the safety of deleting a security module is up to diff --git a/include/linux/module.h b/include/linux/module.h index f807f15bebbe..264979283756 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -123,7 +123,6 @@ extern void cleanup_module(void); #define late_initcall_sync(fn) module_init(fn) #define console_initcall(fn) module_init(fn) -#define security_initcall(fn) module_init(fn) /* Each module must use one module_init(). */ #define module_init(initfn) \ diff --git a/security/integrity/iint.c b/security/integrity/iint.c index 5a6810041e5c..70d21b566955 100644 --- a/security/integrity/iint.c +++ b/security/integrity/iint.c @@ -22,6 +22,7 @@ #include #include #include +#include #include "integrity.h" static struct rb_root integrity_iint_tree = RB_ROOT; diff --git a/security/security.c b/security/security.c index 41a5da2c7faf..e74f46fba591 100644 --- a/security/security.c +++ b/security/security.c @@ -43,16 +43,12 @@ char *lsm_names; static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] = CONFIG_DEFAULT_SECURITY; -static void __init do_security_initcalls(void) +static void __init major_lsm_init(void) { - initcall_t call; - initcall_entry_t *ce; + struct lsm_info *lsm; - ce = __start_lsm_info; - while (ce < __end_lsm_info) { - call = initcall_from_entry(ce); - call(); - ce++; + for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) { + lsm->init(); } } @@ -82,7 +78,7 @@ int __init security_init(void) /* * Load all the remaining security modules. */ - do_security_initcalls(); + major_lsm_init(); return 0; }