List of syscall masks by call number

Here we give the list of Linux syscalls and the sysmask masks acting on them, up to call number 269. Syscalls with higher numbers are masked by the mask "new".

Please note that many library functions are based on system calls. For example, fopen() uses open, printf() uses write, ftell() uses lseek, malloc() uses brk. The masking of a syscall will break EVERY library function that depends on it.

Number	Name	Hard masks	Partial masks
0	restart_syscall	new
1	exit	---
2	fork	fork
3	read	---
4	write	---
5	open	open	ropen, wopen, dev, procfs, creat
6	close	---
7	waitpid	fork
8	creat	open	ropen, wopen, creat
9	link	link
10	unlink	erase
11	execve	execve	exec, suid
12	chdir	chdir
13	time	harmless
14	mknod	mount
15	chmod	chmod
16	lchown16	rootmisc
18	stat	obsolete, dread
19	lseek	fnoharm
20	getpid	harmless
21	mount	mount
22	oldumount	mount
23	setuid16	---	suid
24	getuid16	harmless
25	stime	sysadm
26	ptrace	misc
27	alarm	signal
28	fstat	dread, obsolete
29	pause	harmless
30	utime	chmod
33	access	dread
34	nice	rlim
36	sync	fnoharm
37	kill	kill
38	rename	link
39	mkdir	dir
40	rmdir	dir, erase
41	dup	fmisc
42	pipe	fmisc
43	times	harmless
45	brk	brk
46	setgid16	---	suid
47	getgid16	harmless
48	signal	signal
49	geteuid16	harmless
50	getegid16	harmless
51	acct	sysadm
52	umount	mount
54	ioctl	ioctl
55	fcntl	open, fmisc
57	setpgid	spid
59	olduname	obsolete
60	umask	chmod
61	chroot	chroot
62	ustat	fs
63	dup2	fmisc
64	getppid	harmless
65	getpgrp	harmless
66	setsid	spid
67	sigaction	signal
68	sgetmask	signal
69	ssetmask	signal
70	setreuid16	---	suid
71	setregid16	---	suid
72	sigsuspend	signal
73	sigpending	signal
74	sethostname	sysadm
75	setrlimit	rlim
76	old_getrlimit	rlim
77	getrusage	rlim
78	gettimeofday	harmless
79	settimeofday	sysadm
80	getgroups16	harmless
81	setgroups16	---	suid
82	old_select	poll
83	symlink	link
84	lstat	obsolete, dread
85	readlink	dread
86	uselib	obsolete
87	swapon	mount
88	reboot	rootmisc
89	old_readdir	obsolete
90	old_mmap	mmap
91	munmap	mmap
92	truncate	erase
93	ftruncate	fmisc
94	fchmod	chmod
95	fchown16	rootmisc
96	getpriority	rlim
97	setpriority	rlim
99	statfs	fs
100	fstatfs	fs
101	ioperm	rootmisc, nonstd
102	socketcall	socketcall	sockopen, socknet, sockop
103	syslog	rootmisc
104	setitimer	rlim
105	getitimer	rlim
106	newstat	dread
107	newlstat	dread
108	newfstat	dread
109	uname	obsolete
110	iopl	rootmisc, nonstd
111	vhangup	rootmisc, nonstd
113	vm86old	obsolete
114	wait4	fork
115	swapoff	mount
116	sysinfo	nonstd
117	ipc	ipc
118	fsync	fnoharm
119	sigreturn	signal
120	clone	fork
121	setdomainname	sysadm, nonstd
122	newuname	harmless
123	modify_ldt	ldt
124	adjtimex	sysadm, nonstd
125	mprotect	misc, mmap
126	sigprocmask	signal
127	create_module	sysadm, nonstd
128	init_module	sysadm, nonstd
129	delete_module	sysadm, nonstd
130	get_kernel_syms	sysadm, nonstd
131	quotactl	sysadm
132	getpgid	spid
133	fchdir	chdir
134	bdflush	nonstd, rootmisc
135	sysfs	fs
136	personality	nonstd
138	setfsuid16	nonstd	suid
139	setfsgid16	nonstd	suid
140	llseek	fnoharm
141	getdents	dread
142	select	poll
143	flock	fmisc
144	msync	mmap, fnoharm
145	readv	harmless
146	writev	harmless
147	getsid	spid
148	fdatasync	fnoharm
149	sysctl	sysadm, nonstd
150	mlock	rootmisc
151	munlock	rootmisc
152	mlockall	rootmisc
153	munlockall	rootmisc
154	sched_setparam	rootmisc
155	sched_getparam	rootmisc
156	sched_setscheduler	rootmisc
157	sched_getscheduler	rootmisc
158	yield	rlim
159	sched_get_priority_max	rlim
160	sched_get_priority_min	rlim
161	sched_rr_get_interval	rootmisc
162	nanosleep	harmless
163	mremap	mmap, nonstd
164	setresuid16	nonstd
165	getresuid16	nonstd
166	vm86	nonstd
167	query_module	sysadm, nonstd
168	poll	poll
169	nfsservctl	sysadm, nonstd
170	setresgid16	nonstd
171	getresgid16	nonstd
172	prctl	nonstd, kill
173	rt_sigreturn	signal
174	rt_sigaction	signal
175	rt_sigprocmask	signal
176	rt_sigpending	signal
177	rt_sigtimedwait	signal
178	rt_sigqueueinfo	signal
179	rt_sigsuspend	signal
180	pread64	harmless
181	pwrite64	harmless
182	chown16	rootmisc
183	getcwd	dread
184	capget	sysmask
185	capset	sysmask
186	sigaltstack	signal, nonstd
187	sendfile	nonstd
190	vfork	fork
191	getrlimit	rlim
192	mmap2	mmap
193	truncate64	erase
194	ftruncate64	fmisc
195	stat64	dread
196	lstat64	dread
197	fstat64	dread
198	lchown	rootmisc
199	getuid	harmless
200	getgid	harmless
201	geteuid	harmless
202	getegid	harmless
203	setreuid	---	suid
204	setregid	---	suid
205	getgroups	harmless
206	setgroups	---	suid
207	fchown	rootmisc
208	setresuid	nonstd
209	getresuid	nonstd
210	setresgid	nonstd
211	getresgid	nonstd
212	chown	rootmisc
213	setuid	---	suid
214	setgid	---	suid
215	setfsuid	nonstd	suid
216	setfsgid	nonstd	suid
217	pivot_root	rootmisc, nonstd
218	mincore	rootmisc, nonstd
219	madvise	rootmisc, nonstd
220	getdents64	dread
221	fcntl64	open, fmisc
224	gettid	harmless
225	readahead	nonstd
226	setxattr	chmod
227	lsetxattr	chmod
228	fsetxattr	chmod
229	getxattr	dread
230	lgetxattr	dread
231	fgetxattr	dread
232	listxattr	dread
233	llistxattr	dread
234	flistxattr	dread
235	removexattr	chmod
236	lremovexattr	chmod
237	fremovexattr	chmod
238	tkill	kill, nonstd
239	sendfile64	nonstd
240	futex	nonstd
241	sched_setaffinity	nonstd, rootmisc
242	sched_getaffinity	nonstd, rootmisc
243	set_thread_area	nonstd, misc
244	get_thread_area	nonstd, misc
245	io_setup	nonstd, rt
246	io_destroy	nonstd, rt
247	io_getevents	nonstd, rt
248	io_submit	nonstd, rt
249	io_cancel	nonstd, rt
250	fadvise64	nonstd
252	exit_group	---
253	lookup_dcookie	nonstd, dread
254	epoll_create	nonstd, poll
255	epoll_ctl	nonstd, poll
256	epoll_wait	nonstd, poll
257	remap_file_pages	nonstd, mmap
258	set_tid_address	nonstd
259	timer_create	nonstd, rt
260	timer_settime	nonstd, rt
261	timer_gettime	nonstd, rt
262	timer_getoverrun	nonstd, rt
263	timer_delete	nonstd, rt
264	clock_settime	nonstd, rt
265	clock_gettime	nonstd, rt
266	clock_getres	nonstd, rt
267	clock_nanosleep	nonstd, rt
268	statfs64	nonstd, fs
269	fstatfs64	nonstd, fs