projects / linux-seccomp.git / blame
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|---|---|---|
| 8befd5cc MG |
1 | /** |
| 2 | * Seccomp System Interfaces | |
| 3 | * | |
| 4 | * Copyright (c) 2012 Red Hat <pmoore@redhat.com> | |
| 5 | * Author: Paul Moore <paul@paul-moore.com> | |
| 6 | */ | |
| 7 | ||
| 8 | /* | |
| 9 | * This library is free software; you can redistribute it and/or modify it | |
| 10 | * under the terms of version 2.1 of the GNU Lesser General Public License as | |
| 11 | * published by the Free Software Foundation. | |
| 12 | * | |
| 13 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
| 14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
| 16 | * for more details. | |
| 17 | * | |
| 18 | * You should have received a copy of the GNU Lesser General Public License | |
| 19 | * along with this library; if not, see <http://www.gnu.org/licenses>. | |
| 20 | */ | |
| 21 | ||
| 22 | #ifndef _SYSTEM_H | |
| 23 | #define _SYSTEM_H | |
| 24 | ||
| 25 | #include <linux/filter.h> | |
| 26 | #include <sys/prctl.h> | |
| 27 | ||
| 28 | #include "configure.h" | |
| 29 | ||
| 30 | /* NOTE: this was taken from the Linux Kernel sources */ | |
| 31 | #define MAX_ERRNO 4095 | |
| 32 | ||
| 33 | struct db_filter_col; | |
| 34 | ||
| 35 | #ifdef HAVE_LINUX_SECCOMP_H | |
| 36 | ||
| 37 | /* system header file */ | |
| 38 | #include <linux/seccomp.h> | |
| 39 | ||
| 40 | #else | |
| 41 | ||
| 42 | /* NOTE: the definitions below were taken from the Linux Kernel sources */ | |
| 43 | #include <linux/types.h> | |
| 44 | ||
| 45 | /* Valid values for seccomp.mode and prctl(PR_SET_SECCOMP, <mode>) */ | |
| 46 | #define SECCOMP_MODE_DISABLED 0 /* seccomp is not in use. */ | |
| 47 | #define SECCOMP_MODE_STRICT 1 /* uses hard-coded filter. */ | |
| 48 | #define SECCOMP_MODE_FILTER 2 /* uses user-supplied filter. */ | |
| 49 | ||
| 50 | /* | |
| 51 | * All BPF programs must return a 32-bit value. | |
| 52 | * The bottom 16-bits are for optional return data. | |
| 53 | * The upper 16-bits are ordered from least permissive values to most. | |
| 54 | * | |
| 55 | * The ordering ensures that a min_t() over composed return values always | |
| 56 | * selects the least permissive choice. | |
| 57 | */ | |
| 58 | #define SECCOMP_RET_KILL 0x00000000U /* kill the task immediately */ | |
| 59 | #define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */ | |
| 60 | #define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */ | |
| 61 | #define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */ | |
| 62 | #define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */ | |
| 63 | ||
| 64 | /* Masks for the return value sections. */ | |
| 65 | #define SECCOMP_RET_ACTION 0x7fff0000U | |
| 66 | #define SECCOMP_RET_DATA 0x0000ffffU | |
| 67 | ||
| 68 | /** | |
| 69 | * struct seccomp_data - the format the BPF program executes over. | |
| 70 | * @nr: the system call number | |
| 71 | * @arch: indicates system call convention as an AUDIT_ARCH_* value | |
| 72 | * as defined in <linux/audit.h>. | |
| 73 | * @instruction_pointer: at the time of the system call. | |
| 74 | * @args: up to 6 system call arguments always stored as 64-bit values | |
| 75 | * regardless of the architecture. | |
| 76 | */ | |
| 77 | struct seccomp_data { | |
| 78 | int nr; | |
| 79 | __u32 arch; | |
| 80 | __u64 instruction_pointer; | |
| 81 | __u64 args[6]; | |
| 82 | }; | |
| 83 | ||
| 84 | #endif /* HAVE_LINUX_SECCOMP_H */ | |
| 85 | ||
| 86 | /* rename some of the socket filter types to make more sense */ | |
| 87 | typedef struct sock_filter bpf_instr_raw; | |
| 88 | ||
| 89 | /* no new privs defintions */ | |
| 90 | #ifndef PR_SET_NO_NEW_PRIVS | |
| 91 | #define PR_SET_NO_NEW_PRIVS 38 | |
| 92 | #endif | |
| 93 | ||
| 94 | #ifndef PR_GET_NO_NEW_PRIVS | |
| 95 | #define PR_GET_NO_NEW_PRIVS 39 | |
| 96 | #endif | |
| 97 | ||
| 98 | /* operations for the seccomp() syscall */ | |
| 99 | #ifndef SECCOMP_SET_MODE_STRICT | |
| 100 | #define SECCOMP_SET_MODE_STRICT 0 | |
| 101 | #endif | |
| 102 | #ifndef SECCOMP_SET_MODE_FILTER | |
| 103 | #define SECCOMP_SET_MODE_FILTER 1 | |
| 104 | #endif | |
| 105 | ||
| 106 | /* flags for the seccomp() syscall */ | |
| 107 | #ifndef SECCOMP_FILTER_FLAG_TSYNC | |
| 108 | #define SECCOMP_FILTER_FLAG_TSYNC 1 | |
| 109 | #endif | |
| 110 | ||
| 111 | int sys_chk_seccomp_syscall(void); | |
| 112 | int sys_chk_seccomp_flag(int flag); | |
| 113 | ||
| 114 | int sys_filter_load(const struct db_filter_col *col); | |
| 115 | ||
| 116 | #endif |