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authorCasey Schaufler <casey@schaufler-ca.com>2015-05-03 01:11:42 +0300
committerJames Morris <james.l.morris@oracle.com>2015-05-12 08:00:41 +0300
commitb1d9e6b0646d0e5ee5d9050bd236b6c65d66faef (patch)
treebefe73902cf0797dabb704cf6688b3fe335fc19e /include/linux/security.h
parente20b043a6902ecb61c2c84355c3bae5149f391db (diff)
downloadlinux-b1d9e6b0646d0e5ee5d9050bd236b6c65d66faef.tar.xz
LSM: Switch to lists of hooks
Instead of using a vector of security operations with explicit, special case stacking of the capability and yama hooks use lists of hooks with capability and yama hooks included as appropriate. The security_operations structure is no longer required. Instead, there is a union of the function pointers that allows all the hooks lists to use a common mechanism for list management while retaining typing. Each module supplies an array describing the hooks it provides instead of a sparsely populated security_operations structure. The description includes the element that gets put on the hook list, avoiding the issues surrounding individual element allocation. The method for registering security modules is changed to reflect the information available. The method for removing a module, currently only used by SELinux, has also changed. It should be generic now, however if there are potential race conditions based on ordering of hook removal that needs to be addressed by the calling module. The security hooks are called from the lists and the first failure is returned. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Acked-by: John Johansen <john.johansen@canonical.com> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Paul Moore <paul@paul-moore.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'include/linux/security.h')
-rw-r--r--include/linux/security.h46
1 files changed, 4 insertions, 42 deletions
diff --git a/include/linux/security.h b/include/linux/security.h
index a2a100e7ac6e..8c8175d41b4c 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/string.h>
+#include <linux/mm.h>
struct linux_binprm;
struct cred;
@@ -54,9 +55,6 @@ struct xattr;
struct xfrm_sec_ctx;
struct mm_struct;
-/* Maximum number of letters for an LSM name string */
-#define SECURITY_NAME_MAX 10
-
/* If capable should audit the security request */
#define SECURITY_CAP_NOAUDIT 0
#define SECURITY_CAP_AUDIT 1
@@ -69,10 +67,7 @@ struct audit_krule;
struct user_namespace;
struct timezone;
-/*
- * These functions are in security/capability.c and are used
- * as the default capabilities functions
- */
+/* These functions are in security/commoncap.c */
extern int cap_capable(const struct cred *cred, struct user_namespace *ns,
int cap, int audit);
extern int cap_settime(const struct timespec *ts, const struct timezone *tz);
@@ -114,8 +109,6 @@ struct xfrm_state;
struct xfrm_user_sec_ctx;
struct seq_file;
-extern int cap_netlink_send(struct sock *sk, struct sk_buff *skb);
-
#ifdef CONFIG_MMU
extern unsigned long mmap_min_addr;
extern unsigned long dac_mmap_min_addr;
@@ -472,7 +465,7 @@ static inline int security_settime(const struct timespec *ts,
static inline int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
{
- return cap_vm_enough_memory(mm, pages);
+ return __vm_enough_memory(mm, pages, cap_vm_enough_memory(mm, pages));
}
static inline int security_bprm_set_creds(struct linux_binprm *bprm)
@@ -1075,7 +1068,7 @@ static inline int security_setprocattr(struct task_struct *p, char *name, void *
static inline int security_netlink_send(struct sock *sk, struct sk_buff *skb)
{
- return cap_netlink_send(sk, skb);
+ return 0;
}
static inline int security_ismaclabel(const char *name)
@@ -1643,36 +1636,5 @@ static inline void free_secdata(void *secdata)
{ }
#endif /* CONFIG_SECURITY */
-#ifdef CONFIG_SECURITY_YAMA
-extern int yama_ptrace_access_check(struct task_struct *child,
- unsigned int mode);
-extern int yama_ptrace_traceme(struct task_struct *parent);
-extern void yama_task_free(struct task_struct *task);
-extern int yama_task_prctl(int option, unsigned long arg2, unsigned long arg3,
- unsigned long arg4, unsigned long arg5);
-#else
-static inline int yama_ptrace_access_check(struct task_struct *child,
- unsigned int mode)
-{
- return 0;
-}
-
-static inline int yama_ptrace_traceme(struct task_struct *parent)
-{
- return 0;
-}
-
-static inline void yama_task_free(struct task_struct *task)
-{
-}
-
-static inline int yama_task_prctl(int option, unsigned long arg2,
- unsigned long arg3, unsigned long arg4,
- unsigned long arg5)
-{
- return -ENOSYS;
-}
-#endif /* CONFIG_SECURITY_YAMA */
-
#endif /* ! __LINUX_SECURITY_H */