2 files changed, 73 insertions, 4 deletions

diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 3c9b616c834a..5c93d6c5d591 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -332,6 +332,7 @@ header-y += scc.h
 header-y += sched.h
 header-y += screen_info.h
 header-y += sdla.h
+header-y += seccomp.h
 header-y += securebits.h
 header-y += selinux_netlink.h
 header-y += sem.h
diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h
index d61f27fcaa97..86bb68fc7683 100644
--- a/include/linux/seccomp.h
+++ b/include/linux/seccomp.h
@@ -1,14 +1,67 @@
 #ifndef _LINUX_SECCOMP_H
 #define _LINUX_SECCOMP_H
 
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+
+/* Valid values for seccomp.mode and prctl(PR_SET_SECCOMP, <mode>) */
+#define SECCOMP_MODE_DISABLED   0 /* seccomp is not in use. */
+#define SECCOMP_MODE_STRICT     1 /* uses hard-coded filter. */
+#define SECCOMP_MODE_FILTER     2 /* uses user-supplied filter. */
+
+/*
+ * All BPF programs must return a 32-bit value.
+ * The bottom 16-bits are reserved for future use.
+ * The upper 16-bits are ordered from least permissive values to most.
+ *
+ * The ordering ensures that a min_t() over composed return values always
+ * selects the least permissive choice.
+ */
+#define SECCOMP_RET_KILL        0x00000000U /* kill the task immediately */
+#define SECCOMP_RET_ALLOW       0x7fff0000U /* allow */
+
+/* Masks for the return value sections. */
+#define SECCOMP_RET_ACTION      0x7fff0000U
+#define SECCOMP_RET_DATA        0x0000ffffU
+
+/**
+ * struct seccomp_data - the format the BPF program executes over.
+ * @nr: the system call number
+ * @arch: indicates system call convention as an AUDIT_ARCH_* value
+ *        as defined in <linux/audit.h>.
+ * @instruction_pointer: at the time of the system call.
+ * @args: up to 6 system call arguments always stored as 64-bit values
+ *        regardless of the architecture.
+ */
+struct seccomp_data {
+        int nr;
+        __u32 arch;
+        __u64 instruction_pointer;
+        __u64 args[6];
+};
 
+#ifdef __KERNEL__
 #ifdef CONFIG_SECCOMP
 
 #include <linux/thread_info.h>
 #include <asm/seccomp.h>
 
+struct seccomp_filter;
+/**
+ * struct seccomp - the state of a seccomp'ed process
+ *
+ * @mode:  indicates one of the valid values above for controlled
+ *         system calls available to a process.
+ * @filter: The metadata and ruleset for determining what system calls
+ *          are allowed for a task.
+ *
+ *          @filter must only be accessed from the context of current as there
+ *          is no locking.
+ */
 struct seccomp {
         int mode;
+        struct seccomp_filter *filter;
 };
 
 extern void __secure_computing(int);
@@ -19,7 +72,7 @@ static inline void secure_computing(int this_syscall)
 }
 
 extern long prctl_get_seccomp(void);
-extern long prctl_set_seccomp(unsigned long);
+extern long prctl_set_seccomp(unsigned long, char __user *);
 
 static inline int seccomp_mode(struct seccomp *s)
 {
@@ -31,15 +84,16 @@ static inline int seccomp_mode(struct seccomp *s)
 #include <linux/errno.h>
 
 struct seccomp { };
+struct seccomp_filter { };
 
-#define secure_computing(x) do { } while (0)
+#define secure_computing(x) 0
 
 static inline long prctl_get_seccomp(void)
 {
         return -EINVAL;
 }
 
-static inline long prctl_set_seccomp(unsigned long arg2)
+static inline long prctl_set_seccomp(unsigned long arg2, char __user *arg3)
 {
         return -EINVAL;
 }
@@ -48,7 +102,21 @@ static inline int seccomp_mode(struct seccomp *s)
 {
         return 0;
 }
-
 #endif /* CONFIG_SECCOMP */
 
+#ifdef CONFIG_SECCOMP_FILTER
+extern void put_seccomp_filter(struct task_struct *tsk);
+extern void get_seccomp_filter(struct task_struct *tsk);
+extern u32 seccomp_bpf_load(int off);
+#else  /* CONFIG_SECCOMP_FILTER */
+static inline void put_seccomp_filter(struct task_struct *tsk)
+{
+        return;
+}
+static inline void get_seccomp_filter(struct task_struct *tsk)
+{
+        return;
+}
+#endif /* CONFIG_SECCOMP_FILTER */
+#endif /* __KERNEL__ */
 #endif /* _LINUX_SECCOMP_H */