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syscall.c
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syscall.c
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/*
* Copyright (C) 2014-2021 Firejail Authors
*
* This file is part of firejail project
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define _GNU_SOURCE
#include "../include/syscall.h"
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <sys/syscall.h>
#include "../include/common.h"
#include "../include/seccomp.h"
#define SYSCALL_ERROR INT_MAX
#define ERRNO_KILL -2
typedef struct {
const char * const name;
int nr;
} SyscallEntry;
typedef struct {
const char * const name;
const char * const list;
} SyscallGroupList;
typedef struct {
const char *slist;
char *prelist, *postlist;
bool found;
int syscall;
} SyscallCheckList;
// Native syscalls (64 bit versions for 64 bit arch etc)
static const SyscallEntry syslist[] = {
#if defined(__x86_64__)
// code generated using
// awk '/__NR_/ { print "{ \"" gensub("__NR_", "", "g", $2) "\", " $3 " },"; }' < /usr/include/x86_64-linux-gnu/asm/unistd_64.h
#include "../include/syscall_x86_64.h"
#elif defined(__i386__)
// awk '/__NR_/ { print "{ \"" gensub("__NR_", "", "g", $2) "\", " $3 " },"; }' < /usr/include/x86_64-linux-gnu/asm/unistd_32.h
#include "../include/syscall_i386.h"
#elif defined(__arm__)
#include "../include/syscall_armeabi.h"
#else
#warning "Please submit a syscall table for your architecture"
#endif
};
// 32 bit syscalls for 64 bit arch
static const SyscallEntry syslist32[] = {
#if defined(__x86_64__)
#include "../include/syscall_i386.h"
// TODO for other 64 bit archs
#elif defined(__i386__) || defined(__arm__) || defined(__powerpc__)
// no secondary arch for 32 bit archs
#endif
};
static const SyscallGroupList sysgroups[] = {
{ .name = "@aio", .list =
#ifdef SYS_io_cancel
"io_cancel,"
#endif
#ifdef SYS_io_destroy
"io_destroy,"
#endif
#ifdef SYS_io_getevents
"io_getevents,"
#endif
#ifdef SYS_io_pgetevents
"io_pgetevents,"
#endif
#ifdef SYS_io_setup
"io_setup,"
#endif
#ifdef SYS_io_submit
"io_submit"
#endif
},
{ .name = "@basic-io", .list =
#ifdef SYS__llseek
"_llseek,"
#endif
#ifdef SYS_close
"close,"
#endif
#ifdef SYS_dup
"dup,"
#endif
#ifdef SYS_dup2
"dup2,"
#endif
#ifdef SYS_dup3
"dup3,"
#endif
#ifdef SYS_lseek
"lseek,"
#endif
#ifdef SYS_pread64
"pread64,"
#endif
#ifdef SYS_preadv
"preadv,"
#endif
#ifdef SYS_preadv2
"preadv2,"
#endif
#ifdef SYS_pwrite64
"pwrite64,"
#endif
#ifdef SYS_pwritev
"pwritev,"
#endif
#ifdef SYS_pwritev2
"pwritev2,"
#endif
#ifdef SYS_read
"read,"
#endif
#ifdef SYS_readv
"readv,"
#endif
#ifdef SYS_write
"write,"
#endif
#ifdef SYS_writev
"writev"
#endif
},
{ .name = "@chown", .list =
#ifdef SYS_chown
"chown,"
#endif
#ifdef SYS_chown32
"chown32,"
#endif
#ifdef SYS_fchown
"fchown,"
#endif
#ifdef SYS_fchown32
"fchown32,"
#endif
#ifdef SYS_fchownat
"fchownat,"
#endif
#ifdef SYS_lchown
"lchown,"
#endif
#ifdef SYS_lchown32
"lchown32"
#endif
},
{ .name = "@clock", .list =
#ifdef SYS_adjtimex
"adjtimex,"
#endif
#ifdef SYS_clock_adjtime
"clock_adjtime,"
#endif
#ifdef SYS_clock_settime
"clock_settime,"
#endif
#ifdef SYS_settimeofday
"settimeofday,"
#endif
#ifdef SYS_stime
"stime"
#endif
},
{ .name = "@cpu-emulation", .list =
#ifdef SYS_modify_ldt
"modify_ldt,"
#endif
#ifdef SYS_subpage_prot
"subpage_prot,"
#endif
#ifdef SYS_switch_endian
"switch_endian,"
#endif
#ifdef SYS_vm86
"vm86,"
#endif
#ifdef SYS_vm86old
"vm86old"
#endif
#if !defined(SYS_modify_ldt) && !defined(SYS_subpage_prot) && !defined(SYS_switch_endian) && !defined(SYS_vm86) && !defined(SYS_vm86old)
"__dummy_syscall__" // workaround for arm64, s390x and sparc64 which don't have any of above defined and empty syscall lists are not allowed
#endif
},
{ .name = "@debug", .list =
#ifdef SYS_lookup_dcookie
"lookup_dcookie,"
#endif
#ifdef SYS_perf_event_open
"perf_event_open,"
#endif
#ifdef SYS_process_vm_writev
"process_vm_writev,"
#endif
#ifdef SYS_rtas
"rtas,"
#endif
#ifdef SYS_s390_runtime_instr
"s390_runtime_instr,"
#endif
#ifdef SYS_sys_debug_setcontext
"sys_debug_setcontext,"
#endif
},
{ .name = "@default", .list =
"@clock,"
"@cpu-emulation,"
"@debug,"
"@module,"
"@mount,"
"@obsolete,"
"@raw-io,"
"@reboot,"
"@swap,"
#ifdef SYS_open_by_handle_at
"open_by_handle_at,"
#endif
#ifdef SYS_name_to_handle_at
"name_to_handle_at,"
#endif
#ifdef SYS_ioprio_set
"ioprio_set,"
#endif
#ifdef SYS_ni_syscall
"ni_syscall,"
#endif
#ifdef SYS_syslog
"syslog,"
#endif
#ifdef SYS_fanotify_init
"fanotify_init,"
#endif
#ifdef SYS_kcmp
"kcmp,"
#endif
#ifdef SYS_add_key
"add_key,"
#endif
#ifdef SYS_request_key
"request_key,"
#endif
#ifdef SYS_mbind
"mbind,"
#endif
#ifdef SYS_migrate_pages
"migrate_pages,"
#endif
#ifdef SYS_move_pages
"move_pages,"
#endif
#ifdef SYS_keyctl
"keyctl,"
#endif
#ifdef SYS_io_setup
"io_setup,"
#endif
#ifdef SYS_io_destroy
"io_destroy,"
#endif
#ifdef SYS_io_getevents
"io_getevents,"
#endif
#ifdef SYS_io_submit
"io_submit,"
#endif
#ifdef SYS_io_cancel
"io_cancel,"
#endif
#ifdef SYS_remap_file_pages
"remap_file_pages,"
#endif
#ifdef SYS_set_mempolicy
"set_mempolicy"
#endif
#ifdef SYS_vmsplice
"vmsplice,"
#endif
#ifdef SYS_userfaultfd
"userfaultfd,"
#endif
#ifdef SYS_acct
"acct,"
#endif
#ifdef SYS_bpf
"bpf,"
#endif
#ifdef SYS_nfsservctl
"nfsservctl,"
#endif
#ifdef SYS_setdomainname
"setdomainname,"
#endif
#ifdef SYS_sethostname
"sethostname,"
#endif
#ifdef SYS_vhangup
"vhangup"
#endif
//#ifdef SYS_mincore // 0.9.57 - problem fixed in Linux kernel 5.0; on 4.x it will break kodi, mpv, totem
// "mincore"
//#endif
},
{ .name = "@default-nodebuggers", .list =
"@default,"
#ifdef SYS_ptrace
"ptrace,"
#endif
#ifdef SYS_personality
"personality,"
#endif
#ifdef SYS_process_vm_readv
"process_vm_readv"
#endif
},
{ .name = "@default-keep", .list =
"execveat," // commonly used by fexecve
"execve,"
"prctl"
},
{ .name = "@file-system", .list =
#ifdef SYS_access
"access,"
#endif
#ifdef SYS_chdir
"chdir,"
#endif
#ifdef SYS_chmod
"chmod,"
#endif
#ifdef SYS_close
"close,"
#endif
#ifdef SYS_creat
"creat,"
#endif
#ifdef SYS_faccessat
"faccessat,"
#endif
#ifdef SYS_faccessat2
"faccessat2,"
#endif
#ifdef SYS_fallocate
"fallocate,"
#endif
#ifdef SYS_fchdir
"fchdir,"
#endif
#ifdef SYS_fchmod
"fchmod,"
#endif
#ifdef SYS_fchmodat
"fchmodat,"
#endif
#ifdef SYS_fcntl
"fcntl,"
#endif
#ifdef SYS_fcntl64
"fcntl64,"
#endif
#ifdef SYS_fgetxattr
"fgetxattr,"
#endif
#ifdef SYS_flistxattr
"flistxattr,"
#endif
#ifdef SYS_fremovexattr
"fremovexattr,"
#endif
#ifdef SYS_fsetxattr
"fsetxattr,"
#endif
#ifdef SYS_fstat
"fstat,"
#endif
#ifdef SYS_fstat64
"fstat64,"
#endif
#ifdef SYS_fstatat64
"fstatat64,"
#endif
#ifdef SYS_fstatfs
"fstatfs,"
#endif
#ifdef SYS_fstatfs64
"fstatfs64,"
#endif
#ifdef SYS_ftruncate
"ftruncate,"
#endif
#ifdef SYS_ftruncate64
"ftruncate64,"
#endif
#ifdef SYS_futimesat
"futimesat,"
#endif
#ifdef SYS_getcwd
"getcwd,"
#endif
#ifdef SYS_getdents
"getdents,"
#endif
#ifdef SYS_getdents64
"getdents64,"
#endif
#ifdef SYS_getxattr
"getxattr,"
#endif
#ifdef SYS_inotify_add_watch
"inotify_add_watch,"
#endif
#ifdef SYS_inotify_init
"inotify_init,"
#endif
#ifdef SYS_inotify_init1
"inotify_init1,"
#endif
#ifdef SYS_inotify_rm_watch
"inotify_rm_watch,"
#endif
#ifdef SYS_lgetxattr
"lgetxattr,"
#endif
#ifdef SYS_link
"link,"
#endif
#ifdef SYS_linkat
"linkat,"
#endif
#ifdef SYS_listxattr
"listxattr,"
#endif
#ifdef SYS_llistxattr
"llistxattr,"
#endif
#ifdef SYS_lremovexattr
"lremovexattr,"
#endif
#ifdef SYS_lsetxattr
"lsetxattr,"
#endif
#ifdef SYS_lstat
"lstat,"
#endif
#ifdef SYS_lstat64
"lstat64,"
#endif
#ifdef SYS_mkdir
"mkdir,"
#endif
#ifdef SYS_mkdirat
"mkdirat,"
#endif
#ifdef SYS_mknod
"mknod,"
#endif
#ifdef SYS_mknodat
"mknodat,"
#endif
#ifdef SYS_mmap
"mmap,"
#endif
#ifdef SYS_mmap2
"mmap2,"
#endif
#ifdef SYS_munmap
"munmap,"
#endif
#ifdef SYS_newfstatat
"newfstatat,"
#endif
#ifdef SYS_oldfstat
"oldfstat,"
#endif
#ifdef SYS_oldlstat
"oldlstat,"
#endif
#ifdef SYS_oldstat
"oldstat,"
#endif
#ifdef SYS_open
"open,"
#endif
#ifdef SYS_openat
"openat,"
#endif
#ifdef SYS_readlink
"readlink,"
#endif
#ifdef SYS_readlinkat
"readlinkat,"
#endif
#ifdef SYS_removexattr
"removexattr,"
#endif
#ifdef SYS_rename
"rename,"
#endif
#ifdef SYS_renameat
"renameat,"
#endif
#ifdef SYS_renameat2
"renameat2,"
#endif
#ifdef SYS_rmdir
"rmdir,"
#endif
#ifdef SYS_setxattr
"setxattr,"
#endif
#ifdef SYS_stat
"stat,"
#endif
#ifdef SYS_stat64
"stat64,"
#endif
#ifdef SYS_statfs
"statfs,"
#endif
#ifdef SYS_statfs64
"statfs64,"
#endif
#ifdef SYS_statx
"statx,"
#endif
#ifdef SYS_symlink
"symlink,"
#endif
#ifdef SYS_symlinkat
"symlinkat,"
#endif
#ifdef SYS_truncate
"truncate,"
#endif
#ifdef SYS_truncate64
"truncate64,"
#endif
#ifdef SYS_unlink
"unlink,"
#endif
#ifdef SYS_unlinkat
"unlinkat,"
#endif
#ifdef SYS_utime
"utime,"
#endif
#ifdef SYS_utimensat
"utimensat,"
#endif
#ifdef SYS_utimes
"utimes"
#endif
},
{ .name = "@io-event", .list =
#ifdef SYS__newselect
"_newselect,"
#endif
#ifdef SYS_epoll_create
"epoll_create,"
#endif
#ifdef SYS_epoll_create1
"epoll_create1,"
#endif
#ifdef SYS_epoll_ctl
"epoll_ctl,"
#endif
#ifdef SYS_epoll_ctl_old
"epoll_ctl_old,"
#endif
#ifdef SYS_epoll_pwait
"epoll_pwait,"
#endif
#ifdef SYS_epoll_wait
"epoll_wait,"
#endif
#ifdef SYS_epoll_wait_old
"epoll_wait_old,"
#endif
#ifdef SYS_eventfd
"eventfd,"
#endif
#ifdef SYS_eventfd2
"eventfd2,"
#endif
#ifdef SYS_poll
"poll,"
#endif
#ifdef SYS_ppoll
"ppoll,"
#endif
#ifdef SYS_pselect6
"pselect6,"
#endif
#ifdef SYS_select
"select"
#endif
},
{ .name = "@ipc", .list =
#ifdef SYS_ipc
"ipc,"
#endif
#ifdef SYS_memfd_create
"memfd_create,"
#endif
#ifdef SYS_mq_getsetattr
"mq_getsetattr,"
#endif
#ifdef SYS_mq_notify
"mq_notify,"
#endif
#ifdef SYS_mq_open
"mq_open,"
#endif
#ifdef SYS_mq_timedreceive
"mq_timedreceive,"
#endif
#ifdef SYS_mq_timedsend
"mq_timedsend,"
#endif
#ifdef SYS_mq_unlink
"mq_unlink,"
#endif
#ifdef SYS_msgctl
"msgctl,"
#endif
#ifdef SYS_msgget
"msgget,"
#endif
#ifdef SYS_msgrcv
"msgrcv,"
#endif
#ifdef SYS_msgsnd
"msgsnd,"
#endif
#ifdef SYS_pipe
"pipe,"
#endif
#ifdef SYS_pipe2
"pipe2,"
#endif
#ifdef SYS_process_vm_readv
"process_vm_readv,"
#endif
#ifdef SYS_process_vm_writev
"process_vm_writev,"
#endif
#ifdef SYS_semctl
"semctl,"
#endif
#ifdef SYS_semget
"semget,"
#endif
#ifdef SYS_semop
"semop,"
#endif
#ifdef SYS_semtimedop
"semtimedop,"
#endif
#ifdef SYS_shmat
"shmat,"
#endif
#ifdef SYS_shmctl
"shmctl,"
#endif
#ifdef SYS_shmdt
"shmdt,"
#endif
#ifdef SYS_shmget
"shmget"
#endif
},
{ .name = "@keyring", .list =
#ifdef SYS_add_key
"add_key,"
#endif
#ifdef SYS_keyctl
"keyctl,"
#endif
#ifdef SYS_request_key
"request_key"
#endif
},
{ .name = "@memlock", .list =
#ifdef SYS_mlock
"mlock,"
#endif
#ifdef SYS_mlock2
"mlock2,"
#endif
#ifdef SYS_mlockall
"mlockall,"
#endif
#ifdef SYS_munlock
"munlock,"
#endif
#ifdef SYS_munlockall
"munlockall"
#endif
},
{ .name = "@module", .list =
#ifdef SYS_delete_module
"delete_module,"
#endif
#ifdef SYS_finit_module
"finit_module,"
#endif
#ifdef SYS_init_module
"init_module"
#endif
},
{ .name = "@mount", .list =
#ifdef SYS_chroot
"chroot,"
#endif
#ifdef SYS_mount
"mount,"
#endif
#ifdef SYS_pivot_root
"pivot_root,"
#endif
#ifdef SYS_umount
"umount,"
#endif
#ifdef SYS_umount2
"umount2"
#endif
},
{ .name = "@network-io", .list =
#ifdef SYS_accept
"accept,"
#endif
#ifdef SYS_accept4
"accept4,"
#endif
#ifdef SYS_bind
"bind,"
#endif
#ifdef SYS_connect
"connect,"
#endif
#ifdef SYS_getpeername
"getpeername,"
#endif
#ifdef SYS_getsockname
"getsockname,"
#endif
#ifdef SYS_getsockopt
"getsockopt,"
#endif
#ifdef SYS_listen
"listen,"
#endif
#ifdef SYS_recv
"recv,"
#endif
#ifdef SYS_recvfrom
"recvfrom,"
#endif
#ifdef SYS_recvmmsg
"recvmmsg,"
#endif
#ifdef SYS_recvmsg
"recvmsg,"
#endif
#ifdef SYS_send
"send,"
#endif
#ifdef SYS_sendmmsg
"sendmmsg,"
#endif
#ifdef SYS_sendmsg
"sendmsg,"
#endif
#ifdef SYS_sendto
"sendto,"
#endif
#ifdef SYS_setsockopt
"setsockopt,"
#endif
#ifdef SYS_shutdown
"shutdown,"
#endif
#ifdef SYS_socket
"socket,"
#endif
#ifdef SYS_socketcall
"socketcall,"
#endif
#ifdef SYS_socketpair
"socketpair"
#endif
},
{ .name = "@obsolete", .list =
#ifdef SYS__sysctl
"_sysctl,"
#endif
#ifdef SYS_afs_syscall
"afs_syscall,"
#endif
#ifdef SYS_bdflush
"bdflush,"
#endif
#ifdef SYS_break
"break,"
#endif
#ifdef SYS_create_module
"create_module,"
#endif
#ifdef SYS_ftime
"ftime,"
#endif
#ifdef SYS_get_kernel_syms
"get_kernel_syms,"
#endif
#ifdef SYS_getpmsg
"getpmsg,"
#endif
#ifdef SYS_gtty
"gtty,"
#endif
#ifdef SYS_idle
"idle,"
#endif
#ifdef SYS_lock
"lock,"
#endif
#ifdef SYS_mpx
"mpx,"
#endif
#ifdef SYS_prof
"prof,"
#endif
#ifdef SYS_profil
"profil,"
#endif
#ifdef SYS_putpmsg
"putpmsg,"
#endif
#ifdef SYS_query_module
"query_module,"
#endif
#ifdef SYS_security
"security,"
#endif
#ifdef SYS_sgetmask
"sgetmask,"
#endif
#ifdef SYS_ssetmask
"ssetmask,"
#endif
#ifdef SYS_stty
"stty,"
#endif
#ifdef SYS_sysfs
"sysfs,"
#endif
#ifdef SYS_tuxcall
"tuxcall,"
#endif
#ifdef SYS_ulimit
"ulimit,"
#endif
#ifdef SYS_uselib
"uselib,"
#endif
#ifdef SYS_ustat
"ustat,"
#endif
#ifdef SYS_vserver
"vserver"
#endif
#if !defined(SYS__sysctl) && !defined(SYS_afs_syscall) && !defined(SYS_bdflush) && !defined(SYS_break) && !defined(SYS_create_module) && !defined(SYS_ftime) && !defined(SYS_get_kernel_syms) && !defined(SYS_getpmsg) && !defined(SYS_gtty) && !defined(SYS_lock) && !defined(SYS_mpx) && !defined(SYS_prof) && !defined(SYS_profil) && !defined(SYS_putpmsg) && !defined(SYS_query_module) && !defined(SYS_security) && !defined(SYS_sgetmask) && !defined(SYS_ssetmask) && !defined(SYS_stty) && !defined(SYS_sysfs) && !defined(SYS_tuxcall) && !defined(SYS_ulimit) && !defined(SYS_uselib) && !defined(SYS_ustat) && !defined(SYS_vserver)
"__dummy_syscall__" // workaround for arm64 which doesn't have any of above defined and empty syscall lists are not allowed
#endif
},
{ .name = "@privileged", .list =
"@chown,"
"@clock,"
"@module,"
"@raw-io,"
"@reboot,"
"@swap,"
#ifdef SYS__sysctl
"_sysctl,"
#endif
#ifdef SYS_acct
"acct,"
#endif
#ifdef SYS_bpf
"bpf,"
#endif
#ifdef SYS_capset
"capset,"
#endif
#ifdef SYS_chroot
"chroot,"
#endif
#ifdef SYS_fanotify_init
"fanotify_init,"
#endif
#ifdef SYS_mount
"mount,"
#endif
#ifdef SYS_nfsservctl
"nfsservctl,"
#endif
#ifdef SYS_open_by_handle_at
"open_by_handle_at,"
#endif
#ifdef SYS_pivot_root
"pivot_root,"
#endif
#ifdef SYS_quotactl
"quotactl,"
#endif
#ifdef SYS_setdomainname
"setdomainname,"
#endif
#ifdef SYS_setfsuid
"setfsuid,"
#endif
#ifdef SYS_setfsuid32
"setfsuid32,"
#endif
#ifdef SYS_setgroups
"setgroups,"
#endif
#ifdef SYS_setgroups32
"setgroups32,"
#endif
#ifdef SYS_sethostname
"sethostname,"
#endif
#ifdef SYS_setresuid
"setresuid,"
#endif
#ifdef SYS_setresuid32
"setresuid32,"
#endif
#ifdef SYS_setreuid
"setreuid,"
#endif
#ifdef SYS_setreuid32
"setreuid32,"
#endif
#ifdef SYS_setuid
"setuid,"
#endif
#ifdef SYS_setuid32
"setuid32,"
#endif
#ifdef SYS_umount2
"umount2,"
#endif
#ifdef SYS_vhangup
"vhangup"
#endif
},
{ .name = "@process", .list =
#ifdef SYS_arch_prctl
"arch_prctl,"
#endif
#ifdef SYS_capget
"capget,"
#endif
#ifdef SYS_clone
"clone,"
#endif
#ifdef SYS_execveat
"execveat,"
#endif
#ifdef SYS_fork
"fork,"
#endif
#ifdef SYS_getrusage
"getrusage,"
#endif
#ifdef SYS_kill