Merge tag 'stable/for-linus-3.6-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel...

[firefly-linux-kernel-4.4.55.git] / include / linux / seccomp.h

diff --git a/include/linux/seccomp.h b/include/linux/seccomp.h
index cc7a4e9cc7ad143bf8c0f9f71c818939462bcf7d..84f6320da50f0a9fe03f30154b9137f9b42dfc74 100644 (file)
--- a/include/linux/seccomp.h
+++ b/include/linux/seccomp.h
@@ -1,25 +1,90 @@
 #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 for optional return data.
+ * 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_TRAP       0x00030000U /* disallow and force a SIGSYS */
+#define SECCOMP_RET_ERRNO      0x00050000U /* returns an errno */
+#define SECCOMP_RET_TRACE      0x7ff00000U /* pass to a tracer or disallow */
+#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>
 
-typedef struct { int mode; } seccomp_t;
-
-extern void __secure_computing(int);
-static inline void secure_computing(int this_syscall)
+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 int __secure_computing(int);
+static inline int secure_computing(int this_syscall)
 {
        if (unlikely(test_thread_flag(TIF_SECCOMP)))
-               __secure_computing(this_syscall);
+               return  __secure_computing(this_syscall);
+       return 0;
+}
+
+/* A wrapper for architectures supporting only SECCOMP_MODE_STRICT. */
+static inline void secure_computing_strict(int this_syscall)
+{
+       BUG_ON(secure_computing(this_syscall) != 0);
 }
 
 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(seccomp_t *s)
+static inline int seccomp_mode(struct seccomp *s)
 {
        return s->mode;
 }
@@ -28,25 +93,41 @@ static inline int seccomp_mode(seccomp_t *s)
 
 #include <linux/errno.h>
 
-typedef struct { } seccomp_t;
+struct seccomp { };
+struct seccomp_filter { };
 
-#define secure_computing(x) do { } while (0)
+static inline int secure_computing(int this_syscall) { return 0; }
+static inline void secure_computing_strict(int this_syscall) { return; }
 
 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;
 }
 
-static inline int seccomp_mode(seccomp_t *s)
+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 */