| 1 | /** |
| 2 | * Enhanced Seccomp Architecture/Machine Specific Code |
| 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 _ARCH_H |
| 23 | #define _ARCH_H |
| 24 | |
| 25 | #include <inttypes.h> |
| 26 | #include <stddef.h> |
| 27 | #include <stdbool.h> |
| 28 | |
| 29 | #include <seccomp.h> |
| 30 | |
| 31 | #include "system.h" |
| 32 | |
| 33 | struct db_filter; |
| 34 | struct db_api_arg; |
| 35 | struct db_api_rule_list; |
| 36 | |
| 37 | struct arch_def { |
| 38 | /* arch definition */ |
| 39 | uint32_t token; |
| 40 | uint32_t token_bpf; |
| 41 | enum { |
| 42 | ARCH_SIZE_UNSPEC = 0, |
| 43 | ARCH_SIZE_32 = 32, |
| 44 | ARCH_SIZE_64 = 64, |
| 45 | } size; |
| 46 | enum { |
| 47 | ARCH_ENDIAN_UNSPEC = 0, |
| 48 | ARCH_ENDIAN_LITTLE, |
| 49 | ARCH_ENDIAN_BIG, |
| 50 | } endian; |
| 51 | |
| 52 | /* arch specific functions */ |
| 53 | int (*syscall_resolve_name)(const char *name); |
| 54 | const char *(*syscall_resolve_num)(int num); |
| 55 | int (*syscall_rewrite)(int *syscall); |
| 56 | int (*rule_add)(struct db_filter_col *col, struct db_filter *db, |
| 57 | bool strict, struct db_api_rule_list *rule); |
| 58 | }; |
| 59 | |
| 60 | /* arch_def for the current architecture */ |
| 61 | extern const struct arch_def *arch_def_native; |
| 62 | |
| 63 | /* NOTE: Syscall mappings can be found by running the following commands |
| 64 | * on the specific architecture's include file: |
| 65 | * # gcc -E -dM <file> | grep '__NR_' |
| 66 | * where <file> in many cases is /usr/include/asm/unistd.h, however, |
| 67 | * depending on the architecture you may need to use a different header. |
| 68 | * Further, you can automatically format this list for use as a struct |
| 69 | * initializer with the following command: |
| 70 | * # gcc -E -dM <file> | grep '__NR_' | \ |
| 71 | * sed -e 's/#define[ \t]\+__NR_//' | sort | \ |
| 72 | * sed -e 's/\([^ \t]\+\)\([ \t]\+\)\([0-9]\+\)/\t{ \"\1\", \3 },/' |
| 73 | * Finally, when creating a table/array of this structure, the final |
| 74 | * sentinel entry should be "{ NULL, __NR_SCMP_ERROR }"; see the existing |
| 75 | * tables as an example. |
| 76 | */ |
| 77 | struct arch_syscall_def { |
| 78 | const char *name; |
| 79 | unsigned int num; |
| 80 | }; |
| 81 | |
| 82 | #define DATUM_MAX ((scmp_datum_t)-1) |
| 83 | #define D64_LO(x) ((uint32_t)((uint64_t)(x) & 0x00000000ffffffff)) |
| 84 | #define D64_HI(x) ((uint32_t)((uint64_t)(x) >> 32)) |
| 85 | |
| 86 | #define ARG_COUNT_MAX 6 |
| 87 | |
| 88 | int arch_valid(uint32_t arch); |
| 89 | |
| 90 | const struct arch_def *arch_def_lookup(uint32_t token); |
| 91 | const struct arch_def *arch_def_lookup_name(const char *arch_name); |
| 92 | |
| 93 | int arch_arg_count_max(const struct arch_def *arch); |
| 94 | |
| 95 | int arch_arg_offset_lo(const struct arch_def *arch, unsigned int arg); |
| 96 | int arch_arg_offset_hi(const struct arch_def *arch, unsigned int arg); |
| 97 | int arch_arg_offset(const struct arch_def *arch, unsigned int arg); |
| 98 | |
| 99 | int arch_syscall_resolve_name(const struct arch_def *arch, const char *name); |
| 100 | const char *arch_syscall_resolve_num(const struct arch_def *arch, int num); |
| 101 | |
| 102 | int arch_syscall_translate(const struct arch_def *arch, int *syscall); |
| 103 | int arch_syscall_rewrite(const struct arch_def *arch, int *syscall); |
| 104 | |
| 105 | int arch_filter_rule_add(struct db_filter_col *col, struct db_filter *db, |
| 106 | bool strict, uint32_t action, int syscall, |
| 107 | unsigned int chain_len, struct db_api_arg *chain); |
| 108 | |
| 109 | #endif |