Bundle libseccomp 2.3.1

[linux-seccomp.git] / libseccomp / src / system.h

diff --git a/libseccomp/src/system.h b/libseccomp/src/system.h
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+/**
+ * Seccomp System Interfaces
+ *
+ * Copyright (c) 2012 Red Hat <pmoore@redhat.com>
+ * Author: Paul Moore <paul@paul-moore.com>
+ */
+
+/*
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, see <http://www.gnu.org/licenses>.
+ */
+
+#ifndef _SYSTEM_H
+#define _SYSTEM_H
+
+#include <linux/filter.h>
+#include <sys/prctl.h>
+
+#include "configure.h"
+
+/* NOTE: this was taken from the Linux Kernel sources */
+#define MAX_ERRNO              4095
+
+struct db_filter_col;
+
+#ifdef HAVE_LINUX_SECCOMP_H
+
+/* system header file */
+#include <linux/seccomp.h>
+
+#else
+
+/* NOTE: the definitions below were taken from the Linux Kernel sources */
+#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];
+};
+
+#endif /* HAVE_LINUX_SECCOMP_H */
+
+/* rename some of the socket filter types to make more sense */
+typedef struct sock_filter bpf_instr_raw;
+
+/* no new privs defintions */
+#ifndef PR_SET_NO_NEW_PRIVS
+#define PR_SET_NO_NEW_PRIVS            38
+#endif
+
+#ifndef PR_GET_NO_NEW_PRIVS
+#define PR_GET_NO_NEW_PRIVS            39
+#endif
+
+/* operations for the seccomp() syscall */
+#ifndef SECCOMP_SET_MODE_STRICT
+#define SECCOMP_SET_MODE_STRICT                0
+#endif
+#ifndef SECCOMP_SET_MODE_FILTER
+#define SECCOMP_SET_MODE_FILTER                1
+#endif
+
+/* flags for the seccomp() syscall */
+#ifndef SECCOMP_FILTER_FLAG_TSYNC
+#define SECCOMP_FILTER_FLAG_TSYNC      1
+#endif
+
+int sys_chk_seccomp_syscall(void);
+int sys_chk_seccomp_flag(int flag);
+
+int sys_filter_load(const struct db_filter_col *col);
+
+#endif