2a65bd94e4
SECCOMP_MEMORY_DENY_WRITE_EXECUTE_BROKEN was conflating two separate things: 1. whether shmat/shmdt/shmget can be filtered (if ipc multiplexer is used, they can not) 2. whether we know this for the current architecture For i386, shmat is implemented as ipc, so seccomp filter is "broken" for shmat, but not for mmap, and SECCOMP_MEMORY_DENY_WRITE_EXECUTE_BROKEN cannot be used to cover both cases. The define was only used for tests — not in the implementation in seccomp-util.c. So let's get rid of SECCOMP_MEMORY_DENY_WRITE_EXECUTE_BROKEN and encode the right condition directly in tests.
102 lines
3.6 KiB
C
102 lines
3.6 KiB
C
#pragma once
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <seccomp.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "set.h"
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const char* seccomp_arch_to_string(uint32_t c);
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int seccomp_arch_from_string(const char *n, uint32_t *ret);
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int seccomp_init_for_arch(scmp_filter_ctx *ret, uint32_t arch, uint32_t default_action);
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bool is_seccomp_available(void);
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typedef struct SyscallFilterSet {
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const char *name;
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const char *help;
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const char *value;
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} SyscallFilterSet;
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enum {
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/* Please leave DEFAULT first, but sort the rest alphabetically */
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SYSCALL_FILTER_SET_DEFAULT,
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SYSCALL_FILTER_SET_BASIC_IO,
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SYSCALL_FILTER_SET_CLOCK,
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SYSCALL_FILTER_SET_CPU_EMULATION,
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SYSCALL_FILTER_SET_DEBUG,
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SYSCALL_FILTER_SET_FILE_SYSTEM,
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SYSCALL_FILTER_SET_IO_EVENT,
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SYSCALL_FILTER_SET_IPC,
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SYSCALL_FILTER_SET_KEYRING,
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SYSCALL_FILTER_SET_MODULE,
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SYSCALL_FILTER_SET_MOUNT,
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SYSCALL_FILTER_SET_NETWORK_IO,
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SYSCALL_FILTER_SET_OBSOLETE,
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SYSCALL_FILTER_SET_PRIVILEGED,
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SYSCALL_FILTER_SET_PROCESS,
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SYSCALL_FILTER_SET_RAW_IO,
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SYSCALL_FILTER_SET_REBOOT,
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SYSCALL_FILTER_SET_RESOURCES,
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SYSCALL_FILTER_SET_SWAP,
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_SYSCALL_FILTER_SET_MAX
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};
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extern const SyscallFilterSet syscall_filter_sets[];
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const SyscallFilterSet *syscall_filter_set_find(const char *name);
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int seccomp_load_syscall_filter_set(uint32_t default_action, const SyscallFilterSet *set, uint32_t action);
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int seccomp_load_syscall_filter_set_raw(uint32_t default_action, Set* set, uint32_t action);
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int seccomp_restrict_archs(Set *archs);
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int seccomp_restrict_namespaces(unsigned long retain);
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int seccomp_protect_sysctl(void);
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int seccomp_restrict_address_families(Set *address_families, bool whitelist);
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int seccomp_restrict_realtime(void);
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int seccomp_memory_deny_write_execute(void);
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#if defined(__i386__) || defined(__s390x__) || defined(__s390__) || defined(__powerpc64__) || defined(__powerpc__) || defined (__mips__)
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/* On these archs, socket() is implemented via the socketcall() syscall multiplexer, and we can't restrict it hence via
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* seccomp */
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#define SECCOMP_RESTRICT_ADDRESS_FAMILIES_BROKEN 1
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#else
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#define SECCOMP_RESTRICT_ADDRESS_FAMILIES_BROKEN 0
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#endif
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/* we don't know the right order of the clone() parameters except for these archs, for now */
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#if defined(__x86_64__) || defined(__i386__) || defined(__s390x__) || defined(__s390__) || defined(__powerpc64__) || defined(__mips__)
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#define SECCOMP_RESTRICT_NAMESPACES_BROKEN 0
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#else
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#define SECCOMP_RESTRICT_NAMESPACES_BROKEN 1
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#endif
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extern const uint32_t seccomp_local_archs[];
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#define SECCOMP_FOREACH_LOCAL_ARCH(arch) \
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for (unsigned _i = ({ (arch) = seccomp_local_archs[0]; 0; }); \
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seccomp_local_archs[_i] != (uint32_t) -1; \
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(arch) = seccomp_local_archs[++_i])
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DEFINE_TRIVIAL_CLEANUP_FUNC(scmp_filter_ctx, seccomp_release);
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