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3eb39f4793
linux/arch/x86/entry/syscalls/syscall_32.tbl
Christian Brauner 3eb39f4793
signal: add pidfd_send_signal() syscall 
The kill() syscall operates on process identifiers (pid). After a process
has exited its pid can be reused by another process. If a caller sends a
signal to a reused pid it will end up signaling the wrong process. This
issue has often surfaced and there has been a push to address this problem [1].

This patch uses file descriptors (fd) from proc/<pid> as stable handles on
struct pid. Even if a pid is recycled the handle will not change. The fd
can be used to send signals to the process it refers to.
Thus, the new syscall pidfd_send_signal() is introduced to solve this
problem. Instead of pids it operates on process fds (pidfd).

/* prototype and argument /*
long pidfd_send_signal(int pidfd, int sig, siginfo_t *info, unsigned int flags);

/* syscall number 424 */
The syscall number was chosen to be 424 to align with Arnd's rework in his
y2038 to minimize merge conflicts (cf. [25]).

In addition to the pidfd and signal argument it takes an additional
siginfo_t and flags argument. If the siginfo_t argument is NULL then
pidfd_send_signal() is equivalent to kill(<positive-pid>, <signal>). If it
is not NULL pidfd_send_signal() is equivalent to rt_sigqueueinfo().
The flags argument is added to allow for future extensions of this syscall.
It currently needs to be passed as 0. Failing to do so will cause EINVAL.

/* pidfd_send_signal() replaces multiple pid-based syscalls */
The pidfd_send_signal() syscall currently takes on the job of
rt_sigqueueinfo(2) and parts of the functionality of kill(2), Namely, when a
positive pid is passed to kill(2). It will however be possible to also
replace tgkill(2) and rt_tgsigqueueinfo(2) if this syscall is extended.

/* sending signals to threads (tid) and process groups (pgid) */
Specifically, the pidfd_send_signal() syscall does currently not operate on
process groups or threads. This is left for future extensions.
In order to extend the syscall to allow sending signal to threads and
process groups appropriately named flags (e.g. PIDFD_TYPE_PGID, and
PIDFD_TYPE_TID) should be added. This implies that the flags argument will
determine what is signaled and not the file descriptor itself. Put in other
words, grouping in this api is a property of the flags argument not a
property of the file descriptor (cf. [13]). Clarification for this has been
requested by Eric (cf. [19]).
When appropriate extensions through the flags argument are added then
pidfd_send_signal() can additionally replace the part of kill(2) which
operates on process groups as well as the tgkill(2) and
rt_tgsigqueueinfo(2) syscalls.
How such an extension could be implemented has been very roughly sketched
in [14], [15], and [16]. However, this should not be taken as a commitment
to a particular implementation. There might be better ways to do it.
Right now this is intentionally left out to keep this patchset as simple as
possible (cf. [4]).

/* naming */
The syscall had various names throughout iterations of this patchset:
- procfd_signal()
- procfd_send_signal()
- taskfd_send_signal()
In the last round of reviews it was pointed out that given that if the
flags argument decides the scope of the signal instead of different types
of fds it might make sense to either settle for "procfd_" or "pidfd_" as
prefix. The community was willing to accept either (cf. [17] and [18]).
Given that one developer expressed strong preference for the "pidfd_"
prefix (cf. [13]) and with other developers less opinionated about the name
we should settle for "pidfd_" to avoid further bikeshedding.

The  "_send_signal" suffix was chosen to reflect the fact that the syscall
takes on the job of multiple syscalls. It is therefore intentional that the
name is not reminiscent of neither kill(2) nor rt_sigqueueinfo(2). Not the
fomer because it might imply that pidfd_send_signal() is a replacement for
kill(2), and not the latter because it is a hassle to remember the correct
spelling - especially for non-native speakers - and because it is not
descriptive enough of what the syscall actually does. The name
"pidfd_send_signal" makes it very clear that its job is to send signals.

/* zombies */
Zombies can be signaled just as any other process. No special error will be
reported since a zombie state is an unreliable state (cf. [3]). However,
this can be added as an extension through the @flags argument if the need
ever arises.

/* cross-namespace signals */
The patch currently enforces that the signaler and signalee either are in
the same pid namespace or that the signaler's pid namespace is an ancestor
of the signalee's pid namespace. This is done for the sake of simplicity
and because it is unclear to what values certain members of struct
siginfo_t would need to be set to (cf. [5], [6]).

/* compat syscalls */
It became clear that we would like to avoid adding compat syscalls
(cf. [7]).  The compat syscall handling is now done in kernel/signal.c
itself by adding __copy_siginfo_from_user_generic() which lets us avoid
compat syscalls (cf. [8]). It should be noted that the addition of
__copy_siginfo_from_user_any() is caused by a bug in the original
implementation of rt_sigqueueinfo(2) (cf. 12).
With upcoming rework for syscall handling things might improve
significantly (cf. [11]) and __copy_siginfo_from_user_any() will not gain
any additional callers.

/* testing */
This patch was tested on x64 and x86.

/* userspace usage */
An asciinema recording for the basic functionality can be found under [9].
With this patch a process can be killed via:

 #define _GNU_SOURCE
 #include <errno.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/syscall.h>
 #include <sys/types.h>
 #include <unistd.h>

 static inline int do_pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
                                         unsigned int flags)
 {
 #ifdef __NR_pidfd_send_signal
         return syscall(__NR_pidfd_send_signal, pidfd, sig, info, flags);
 #else
         return -ENOSYS;
 #endif
 }

 int main(int argc, char *argv[])
 {
         int fd, ret, saved_errno, sig;

         if (argc < 3)
                 exit(EXIT_FAILURE);

         fd = open(argv[1], O_DIRECTORY | O_CLOEXEC);
         if (fd < 0) {
                 printf("%s - Failed to open \"%s\"\n", strerror(errno), argv[1]);
                 exit(EXIT_FAILURE);
         }

         sig = atoi(argv[2]);

         printf("Sending signal %d to process %s\n", sig, argv[1]);
         ret = do_pidfd_send_signal(fd, sig, NULL, 0);

         saved_errno = errno;
         close(fd);
         errno = saved_errno;

         if (ret < 0) {
                 printf("%s - Failed to send signal %d to process %s\n",
                        strerror(errno), sig, argv[1]);
                 exit(EXIT_FAILURE);
         }

         exit(EXIT_SUCCESS);
 }

/* Q&A
 * Given that it seems the same questions get asked again by people who are
 * late to the party it makes sense to add a Q&A section to the commit
 * message so it's hopefully easier to avoid duplicate threads.
 *
 * For the sake of progress please consider these arguments settled unless
 * there is a new point that desperately needs to be addressed. Please make
 * sure to check the links to the threads in this commit message whether
 * this has not already been covered.
 */
Q-01: (Florian Weimer [20], Andrew Morton [21])
      What happens when the target process has exited?
A-01: Sending the signal will fail with ESRCH (cf. [22]).

Q-02:  (Andrew Morton [21])
       Is the task_struct pinned by the fd?
A-02:  No. A reference to struct pid is kept. struct pid - as far as I
       understand - was created exactly for the reason to not require to
       pin struct task_struct (cf. [22]).

Q-03: (Andrew Morton [21])
      Does the entire procfs directory remain visible? Just one entry
      within it?
A-03: The same thing that happens right now when you hold a file descriptor
      to /proc/<pid> open (cf. [22]).

Q-04: (Andrew Morton [21])
      Does the pid remain reserved?
A-04: No. This patchset guarantees a stable handle not that pids are not
      recycled (cf. [22]).

Q-05: (Andrew Morton [21])
      Do attempts to signal that fd return errors?
A-05: See {Q,A}-01.

Q-06: (Andrew Morton [22])
      Is there a cleaner way of obtaining the fd? Another syscall perhaps.
A-06: Userspace can already trivially retrieve file descriptors from procfs
      so this is something that we will need to support anyway. Hence,
      there's no immediate need to add another syscalls just to make
      pidfd_send_signal() not dependent on the presence of procfs. However,
      adding a syscalls to get such file descriptors is planned for a
      future patchset (cf. [22]).

Q-07: (Andrew Morton [21] and others)
      This fd-for-a-process sounds like a handy thing and people may well
      think up other uses for it in the future, probably unrelated to
      signals. Are the code and the interface designed to permit such
      future applications?
A-07: Yes (cf. [22]).

Q-08: (Andrew Morton [21] and others)
      Now I think about it, why a new syscall? This thing is looking
      rather like an ioctl?
A-08: This has been extensively discussed. It was agreed that a syscall is
      preferred for a variety or reasons. Here are just a few taken from
      prior threads. Syscalls are safer than ioctl()s especially when
      signaling to fds. Processes are a core kernel concept so a syscall
      seems more appropriate. The layout of the syscall with its four
      arguments would require the addition of a custom struct for the
      ioctl() thereby causing at least the same amount or even more
      complexity for userspace than a simple syscall. The new syscall will
      replace multiple other pid-based syscalls (see description above).
      The file-descriptors-for-processes concept introduced with this
      syscall will be extended with other syscalls in the future. See also
      [22], [23] and various other threads already linked in here.

Q-09: (Florian Weimer [24])
      What happens if you use the new interface with an O_PATH descriptor?
A-09:
      pidfds opened as O_PATH fds cannot be used to send signals to a
      process (cf. [2]). Signaling processes through pidfds is the
      equivalent of writing to a file. Thus, this is not an operation that
      operates "purely at the file descriptor level" as required by the
      open(2) manpage. See also [4].

/* References */
[1]:  https://lore.kernel.org/lkml/20181029221037.87724-1-dancol@google.com/
[2]:  https://lore.kernel.org/lkml/874lbtjvtd.fsf@oldenburg2.str.redhat.com/
[3]:  https://lore.kernel.org/lkml/20181204132604.aspfupwjgjx6fhva@brauner.io/
[4]:  https://lore.kernel.org/lkml/20181203180224.fkvw4kajtbvru2ku@brauner.io/
[5]:  https://lore.kernel.org/lkml/20181121213946.GA10795@mail.hallyn.com/
[6]:  https://lore.kernel.org/lkml/20181120103111.etlqp7zop34v6nv4@brauner.io/
[7]:  https://lore.kernel.org/lkml/36323361-90BD-41AF-AB5B-EE0D7BA02C21@amacapital.net/
[8]:  https://lore.kernel.org/lkml/87tvjxp8pc.fsf@xmission.com/
[9]:  https://asciinema.org/a/IQjuCHew6bnq1cr78yuMv16cy
[11]: https://lore.kernel.org/lkml/F53D6D38-3521-4C20-9034-5AF447DF62FF@amacapital.net/
[12]: https://lore.kernel.org/lkml/87zhtjn8ck.fsf@xmission.com/
[13]: https://lore.kernel.org/lkml/871s6u9z6u.fsf@xmission.com/
[14]: https://lore.kernel.org/lkml/20181206231742.xxi4ghn24z4h2qki@brauner.io/
[15]: https://lore.kernel.org/lkml/20181207003124.GA11160@mail.hallyn.com/
[16]: https://lore.kernel.org/lkml/20181207015423.4miorx43l3qhppfz@brauner.io/
[17]: https://lore.kernel.org/lkml/CAGXu5jL8PciZAXvOvCeCU3wKUEB_dU-O3q0tDw4uB_ojMvDEew@mail.gmail.com/
[18]: https://lore.kernel.org/lkml/20181206222746.GB9224@mail.hallyn.com/
[19]: https://lore.kernel.org/lkml/20181208054059.19813-1-christian@brauner.io/
[20]: https://lore.kernel.org/lkml/8736rebl9s.fsf@oldenburg.str.redhat.com/
[21]: https://lore.kernel.org/lkml/20181228152012.dbf0508c2508138efc5f2bbe@linux-foundation.org/
[22]: https://lore.kernel.org/lkml/20181228233725.722tdfgijxcssg76@brauner.io/
[23]: https://lwn.net/Articles/773459/
[24]: https://lore.kernel.org/lkml/8736rebl9s.fsf@oldenburg.str.redhat.com/
[25]: https://lore.kernel.org/lkml/CAK8P3a0ej9NcJM8wXNPbcGUyOUZYX+VLoDFdbenW3s3114oQZw@mail.gmail.com/

Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Jann Horn <jannh@google.com>
Cc: Andy Lutomirsky <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Christian Brauner <christian@brauner.io>
Reviewed-by: Tycho Andersen <tycho@tycho.ws>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: David Howells <dhowells@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Serge Hallyn <serge@hallyn.com>
Acked-by: Aleksa Sarai <cyphar@cyphar.com>
2019-03-05 17:03:53 +01:00

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#
# 32-bit system call numbers and entry vectors
#
# The format is:
# <number> <abi> <name> <entry point> <compat entry point>
#
# The __ia32_sys and __ia32_compat_sys stubs are created on-the-fly for
# sys_*() system calls and compat_sys_*() compat system calls if
# IA32_EMULATION is defined, and expect struct pt_regs *regs as their only
# parameter.
#
# The abi is always "i386" for this file.
#
0 i386 restart_syscall sys_restart_syscall __ia32_sys_restart_syscall
1 i386 exit sys_exit __ia32_sys_exit
2 i386 fork sys_fork __ia32_sys_fork
3 i386 read sys_read __ia32_sys_read
4 i386 write sys_write __ia32_sys_write
5 i386 open sys_open __ia32_compat_sys_open
6 i386 close sys_close __ia32_sys_close
7 i386 waitpid sys_waitpid __ia32_sys_waitpid
8 i386 creat sys_creat __ia32_sys_creat
9 i386 link sys_link __ia32_sys_link
10 i386 unlink sys_unlink __ia32_sys_unlink
11 i386 execve sys_execve __ia32_compat_sys_execve
12 i386 chdir sys_chdir __ia32_sys_chdir
13 i386 time sys_time __ia32_compat_sys_time
14 i386 mknod sys_mknod __ia32_sys_mknod
15 i386 chmod sys_chmod __ia32_sys_chmod
16 i386 lchown sys_lchown16 __ia32_sys_lchown16
17 i386 break
18 i386 oldstat sys_stat __ia32_sys_stat
19 i386 lseek sys_lseek __ia32_compat_sys_lseek
20 i386 getpid sys_getpid __ia32_sys_getpid
21 i386 mount sys_mount __ia32_compat_sys_mount
22 i386 umount sys_oldumount __ia32_sys_oldumount
23 i386 setuid sys_setuid16 __ia32_sys_setuid16
24 i386 getuid sys_getuid16 __ia32_sys_getuid16
25 i386 stime sys_stime __ia32_compat_sys_stime
26 i386 ptrace sys_ptrace __ia32_compat_sys_ptrace
27 i386 alarm sys_alarm __ia32_sys_alarm
28 i386 oldfstat sys_fstat __ia32_sys_fstat
29 i386 pause sys_pause __ia32_sys_pause
30 i386 utime sys_utime __ia32_compat_sys_utime
31 i386 stty
32 i386 gtty
33 i386 access sys_access __ia32_sys_access
34 i386 nice sys_nice __ia32_sys_nice
35 i386 ftime
36 i386 sync sys_sync __ia32_sys_sync
37 i386 kill sys_kill __ia32_sys_kill
38 i386 rename sys_rename __ia32_sys_rename
39 i386 mkdir sys_mkdir __ia32_sys_mkdir
40 i386 rmdir sys_rmdir __ia32_sys_rmdir
41 i386 dup sys_dup __ia32_sys_dup
42 i386 pipe sys_pipe __ia32_sys_pipe
43 i386 times sys_times __ia32_compat_sys_times
44 i386 prof
45 i386 brk sys_brk __ia32_sys_brk
46 i386 setgid sys_setgid16 __ia32_sys_setgid16
47 i386 getgid sys_getgid16 __ia32_sys_getgid16
48 i386 signal sys_signal __ia32_sys_signal
49 i386 geteuid sys_geteuid16 __ia32_sys_geteuid16
50 i386 getegid sys_getegid16 __ia32_sys_getegid16
51 i386 acct sys_acct __ia32_sys_acct
52 i386 umount2 sys_umount __ia32_sys_umount
53 i386 lock
54 i386 ioctl sys_ioctl __ia32_compat_sys_ioctl
55 i386 fcntl sys_fcntl __ia32_compat_sys_fcntl64
56 i386 mpx
57 i386 setpgid sys_setpgid __ia32_sys_setpgid
58 i386 ulimit
59 i386 oldolduname sys_olduname __ia32_sys_olduname
60 i386 umask sys_umask __ia32_sys_umask
61 i386 chroot sys_chroot __ia32_sys_chroot
62 i386 ustat sys_ustat __ia32_compat_sys_ustat
63 i386 dup2 sys_dup2 __ia32_sys_dup2
64 i386 getppid sys_getppid __ia32_sys_getppid
65 i386 getpgrp sys_getpgrp __ia32_sys_getpgrp
66 i386 setsid sys_setsid __ia32_sys_setsid
67 i386 sigaction sys_sigaction __ia32_compat_sys_sigaction
68 i386 sgetmask sys_sgetmask __ia32_sys_sgetmask
69 i386 ssetmask sys_ssetmask __ia32_sys_ssetmask
70 i386 setreuid sys_setreuid16 __ia32_sys_setreuid16
71 i386 setregid sys_setregid16 __ia32_sys_setregid16
72 i386 sigsuspend sys_sigsuspend __ia32_sys_sigsuspend
73 i386 sigpending sys_sigpending __ia32_compat_sys_sigpending
74 i386 sethostname sys_sethostname __ia32_sys_sethostname
75 i386 setrlimit sys_setrlimit __ia32_compat_sys_setrlimit
76 i386 getrlimit sys_old_getrlimit __ia32_compat_sys_old_getrlimit
77 i386 getrusage sys_getrusage __ia32_compat_sys_getrusage
78 i386 gettimeofday sys_gettimeofday __ia32_compat_sys_gettimeofday
79 i386 settimeofday sys_settimeofday __ia32_compat_sys_settimeofday
80 i386 getgroups sys_getgroups16 __ia32_sys_getgroups16
81 i386 setgroups sys_setgroups16 __ia32_sys_setgroups16
82 i386 select sys_old_select __ia32_compat_sys_old_select
83 i386 symlink sys_symlink __ia32_sys_symlink
84 i386 oldlstat sys_lstat __ia32_sys_lstat
85 i386 readlink sys_readlink __ia32_sys_readlink
86 i386 uselib sys_uselib __ia32_sys_uselib
87 i386 swapon sys_swapon __ia32_sys_swapon
88 i386 reboot sys_reboot __ia32_sys_reboot
89 i386 readdir sys_old_readdir __ia32_compat_sys_old_readdir
90 i386 mmap sys_old_mmap __ia32_compat_sys_x86_mmap
91 i386 munmap sys_munmap __ia32_sys_munmap
92 i386 truncate sys_truncate __ia32_compat_sys_truncate
93 i386 ftruncate sys_ftruncate __ia32_compat_sys_ftruncate
94 i386 fchmod sys_fchmod __ia32_sys_fchmod
95 i386 fchown sys_fchown16 __ia32_sys_fchown16
96 i386 getpriority sys_getpriority __ia32_sys_getpriority
97 i386 setpriority sys_setpriority __ia32_sys_setpriority
98 i386 profil
99 i386 statfs sys_statfs __ia32_compat_sys_statfs
100 i386 fstatfs sys_fstatfs __ia32_compat_sys_fstatfs
101 i386 ioperm sys_ioperm __ia32_sys_ioperm
102 i386 socketcall sys_socketcall __ia32_compat_sys_socketcall
103 i386 syslog sys_syslog __ia32_sys_syslog
104 i386 setitimer sys_setitimer __ia32_compat_sys_setitimer
105 i386 getitimer sys_getitimer __ia32_compat_sys_getitimer
106 i386 stat sys_newstat __ia32_compat_sys_newstat
107 i386 lstat sys_newlstat __ia32_compat_sys_newlstat
108 i386 fstat sys_newfstat __ia32_compat_sys_newfstat
109 i386 olduname sys_uname __ia32_sys_uname
110 i386 iopl sys_iopl __ia32_sys_iopl
111 i386 vhangup sys_vhangup __ia32_sys_vhangup
112 i386 idle
113 i386 vm86old sys_vm86old sys_ni_syscall
114 i386 wait4 sys_wait4 __ia32_compat_sys_wait4
115 i386 swapoff sys_swapoff __ia32_sys_swapoff
116 i386 sysinfo sys_sysinfo __ia32_compat_sys_sysinfo
117 i386 ipc sys_ipc __ia32_compat_sys_ipc
118 i386 fsync sys_fsync __ia32_sys_fsync
119 i386 sigreturn sys_sigreturn sys32_sigreturn
120 i386 clone sys_clone __ia32_compat_sys_x86_clone
121 i386 setdomainname sys_setdomainname __ia32_sys_setdomainname
122 i386 uname sys_newuname __ia32_sys_newuname
123 i386 modify_ldt sys_modify_ldt __ia32_sys_modify_ldt
124 i386 adjtimex sys_adjtimex __ia32_compat_sys_adjtimex
125 i386 mprotect sys_mprotect __ia32_sys_mprotect
126 i386 sigprocmask sys_sigprocmask __ia32_compat_sys_sigprocmask
127 i386 create_module
128 i386 init_module sys_init_module __ia32_sys_init_module
129 i386 delete_module sys_delete_module __ia32_sys_delete_module
130 i386 get_kernel_syms
131 i386 quotactl sys_quotactl __ia32_compat_sys_quotactl32
132 i386 getpgid sys_getpgid __ia32_sys_getpgid
133 i386 fchdir sys_fchdir __ia32_sys_fchdir
134 i386 bdflush sys_bdflush __ia32_sys_bdflush
135 i386 sysfs sys_sysfs __ia32_sys_sysfs
136 i386 personality sys_personality __ia32_sys_personality
137 i386 afs_syscall
138 i386 setfsuid sys_setfsuid16 __ia32_sys_setfsuid16
139 i386 setfsgid sys_setfsgid16 __ia32_sys_setfsgid16
140 i386 _llseek sys_llseek __ia32_sys_llseek
141 i386 getdents sys_getdents __ia32_compat_sys_getdents
142 i386 _newselect sys_select __ia32_compat_sys_select
143 i386 flock sys_flock __ia32_sys_flock
144 i386 msync sys_msync __ia32_sys_msync
145 i386 readv sys_readv __ia32_compat_sys_readv
146 i386 writev sys_writev __ia32_compat_sys_writev
147 i386 getsid sys_getsid __ia32_sys_getsid
148 i386 fdatasync sys_fdatasync __ia32_sys_fdatasync
149 i386 _sysctl sys_sysctl __ia32_compat_sys_sysctl
150 i386 mlock sys_mlock __ia32_sys_mlock
151 i386 munlock sys_munlock __ia32_sys_munlock
152 i386 mlockall sys_mlockall __ia32_sys_mlockall
153 i386 munlockall sys_munlockall __ia32_sys_munlockall
154 i386 sched_setparam sys_sched_setparam __ia32_sys_sched_setparam
155 i386 sched_getparam sys_sched_getparam __ia32_sys_sched_getparam
156 i386 sched_setscheduler sys_sched_setscheduler __ia32_sys_sched_setscheduler
157 i386 sched_getscheduler sys_sched_getscheduler __ia32_sys_sched_getscheduler
158 i386 sched_yield sys_sched_yield __ia32_sys_sched_yield
159 i386 sched_get_priority_max sys_sched_get_priority_max __ia32_sys_sched_get_priority_max
160 i386 sched_get_priority_min sys_sched_get_priority_min __ia32_sys_sched_get_priority_min
161 i386 sched_rr_get_interval sys_sched_rr_get_interval __ia32_compat_sys_sched_rr_get_interval
162 i386 nanosleep sys_nanosleep __ia32_compat_sys_nanosleep
163 i386 mremap sys_mremap __ia32_sys_mremap
164 i386 setresuid sys_setresuid16 __ia32_sys_setresuid16
165 i386 getresuid sys_getresuid16 __ia32_sys_getresuid16
166 i386 vm86 sys_vm86 sys_ni_syscall
167 i386 query_module
168 i386 poll sys_poll __ia32_sys_poll
169 i386 nfsservctl
170 i386 setresgid sys_setresgid16 __ia32_sys_setresgid16
171 i386 getresgid sys_getresgid16 __ia32_sys_getresgid16
172 i386 prctl sys_prctl __ia32_sys_prctl
173 i386 rt_sigreturn sys_rt_sigreturn sys32_rt_sigreturn
174 i386 rt_sigaction sys_rt_sigaction __ia32_compat_sys_rt_sigaction
175 i386 rt_sigprocmask sys_rt_sigprocmask __ia32_sys_rt_sigprocmask
176 i386 rt_sigpending sys_rt_sigpending __ia32_compat_sys_rt_sigpending
177 i386 rt_sigtimedwait sys_rt_sigtimedwait __ia32_compat_sys_rt_sigtimedwait
178 i386 rt_sigqueueinfo sys_rt_sigqueueinfo __ia32_compat_sys_rt_sigqueueinfo
179 i386 rt_sigsuspend sys_rt_sigsuspend __ia32_sys_rt_sigsuspend
180 i386 pread64 sys_pread64 __ia32_compat_sys_x86_pread
181 i386 pwrite64 sys_pwrite64 __ia32_compat_sys_x86_pwrite
182 i386 chown sys_chown16 __ia32_sys_chown16
183 i386 getcwd sys_getcwd __ia32_sys_getcwd
184 i386 capget sys_capget __ia32_sys_capget
185 i386 capset sys_capset __ia32_sys_capset
186 i386 sigaltstack sys_sigaltstack __ia32_compat_sys_sigaltstack
187 i386 sendfile sys_sendfile __ia32_compat_sys_sendfile
188 i386 getpmsg
189 i386 putpmsg
190 i386 vfork sys_vfork __ia32_sys_vfork
191 i386 ugetrlimit sys_getrlimit __ia32_compat_sys_getrlimit
192 i386 mmap2 sys_mmap_pgoff __ia32_sys_mmap_pgoff
193 i386 truncate64 sys_truncate64 __ia32_compat_sys_x86_truncate64
194 i386 ftruncate64 sys_ftruncate64 __ia32_compat_sys_x86_ftruncate64
195 i386 stat64 sys_stat64 __ia32_compat_sys_x86_stat64
196 i386 lstat64 sys_lstat64 __ia32_compat_sys_x86_lstat64
197 i386 fstat64 sys_fstat64 __ia32_compat_sys_x86_fstat64
198 i386 lchown32 sys_lchown __ia32_sys_lchown
199 i386 getuid32 sys_getuid __ia32_sys_getuid
200 i386 getgid32 sys_getgid __ia32_sys_getgid
201 i386 geteuid32 sys_geteuid __ia32_sys_geteuid
202 i386 getegid32 sys_getegid __ia32_sys_getegid
203 i386 setreuid32 sys_setreuid __ia32_sys_setreuid
204 i386 setregid32 sys_setregid __ia32_sys_setregid
205 i386 getgroups32 sys_getgroups __ia32_sys_getgroups
206 i386 setgroups32 sys_setgroups __ia32_sys_setgroups
207 i386 fchown32 sys_fchown __ia32_sys_fchown
208 i386 setresuid32 sys_setresuid __ia32_sys_setresuid
209 i386 getresuid32 sys_getresuid __ia32_sys_getresuid
210 i386 setresgid32 sys_setresgid __ia32_sys_setresgid
211 i386 getresgid32 sys_getresgid __ia32_sys_getresgid
212 i386 chown32 sys_chown __ia32_sys_chown
213 i386 setuid32 sys_setuid __ia32_sys_setuid
214 i386 setgid32 sys_setgid __ia32_sys_setgid
215 i386 setfsuid32 sys_setfsuid __ia32_sys_setfsuid
216 i386 setfsgid32 sys_setfsgid __ia32_sys_setfsgid
217 i386 pivot_root sys_pivot_root __ia32_sys_pivot_root
218 i386 mincore sys_mincore __ia32_sys_mincore
219 i386 madvise sys_madvise __ia32_sys_madvise
220 i386 getdents64 sys_getdents64 __ia32_sys_getdents64
221 i386 fcntl64 sys_fcntl64 __ia32_compat_sys_fcntl64
# 222 is unused
# 223 is unused
224 i386 gettid sys_gettid __ia32_sys_gettid
225 i386 readahead sys_readahead __ia32_compat_sys_x86_readahead
226 i386 setxattr sys_setxattr __ia32_sys_setxattr
227 i386 lsetxattr sys_lsetxattr __ia32_sys_lsetxattr
228 i386 fsetxattr sys_fsetxattr __ia32_sys_fsetxattr
229 i386 getxattr sys_getxattr __ia32_sys_getxattr
230 i386 lgetxattr sys_lgetxattr __ia32_sys_lgetxattr
231 i386 fgetxattr sys_fgetxattr __ia32_sys_fgetxattr
232 i386 listxattr sys_listxattr __ia32_sys_listxattr
233 i386 llistxattr sys_llistxattr __ia32_sys_llistxattr
234 i386 flistxattr sys_flistxattr __ia32_sys_flistxattr
235 i386 removexattr sys_removexattr __ia32_sys_removexattr
236 i386 lremovexattr sys_lremovexattr __ia32_sys_lremovexattr
237 i386 fremovexattr sys_fremovexattr __ia32_sys_fremovexattr
238 i386 tkill sys_tkill __ia32_sys_tkill
239 i386 sendfile64 sys_sendfile64 __ia32_sys_sendfile64
240 i386 futex sys_futex __ia32_compat_sys_futex
241 i386 sched_setaffinity sys_sched_setaffinity __ia32_compat_sys_sched_setaffinity
242 i386 sched_getaffinity sys_sched_getaffinity __ia32_compat_sys_sched_getaffinity
243 i386 set_thread_area sys_set_thread_area __ia32_sys_set_thread_area
244 i386 get_thread_area sys_get_thread_area __ia32_sys_get_thread_area
245 i386 io_setup sys_io_setup __ia32_compat_sys_io_setup
246 i386 io_destroy sys_io_destroy __ia32_sys_io_destroy
247 i386 io_getevents sys_io_getevents __ia32_compat_sys_io_getevents
248 i386 io_submit sys_io_submit __ia32_compat_sys_io_submit
249 i386 io_cancel sys_io_cancel __ia32_sys_io_cancel
250 i386 fadvise64 sys_fadvise64 __ia32_compat_sys_x86_fadvise64
# 251 is available for reuse (was briefly sys_set_zone_reclaim)
252 i386 exit_group sys_exit_group __ia32_sys_exit_group
253 i386 lookup_dcookie sys_lookup_dcookie __ia32_compat_sys_lookup_dcookie
254 i386 epoll_create sys_epoll_create __ia32_sys_epoll_create
255 i386 epoll_ctl sys_epoll_ctl __ia32_sys_epoll_ctl
256 i386 epoll_wait sys_epoll_wait __ia32_sys_epoll_wait
257 i386 remap_file_pages sys_remap_file_pages __ia32_sys_remap_file_pages
258 i386 set_tid_address sys_set_tid_address __ia32_sys_set_tid_address
259 i386 timer_create sys_timer_create __ia32_compat_sys_timer_create
260 i386 timer_settime sys_timer_settime __ia32_compat_sys_timer_settime
261 i386 timer_gettime sys_timer_gettime __ia32_compat_sys_timer_gettime
262 i386 timer_getoverrun sys_timer_getoverrun __ia32_sys_timer_getoverrun
263 i386 timer_delete sys_timer_delete __ia32_sys_timer_delete
264 i386 clock_settime sys_clock_settime __ia32_compat_sys_clock_settime
265 i386 clock_gettime sys_clock_gettime __ia32_compat_sys_clock_gettime
266 i386 clock_getres sys_clock_getres __ia32_compat_sys_clock_getres
267 i386 clock_nanosleep sys_clock_nanosleep __ia32_compat_sys_clock_nanosleep
268 i386 statfs64 sys_statfs64 __ia32_compat_sys_statfs64
269 i386 fstatfs64 sys_fstatfs64 __ia32_compat_sys_fstatfs64
270 i386 tgkill sys_tgkill __ia32_sys_tgkill
271 i386 utimes sys_utimes __ia32_compat_sys_utimes
272 i386 fadvise64_64 sys_fadvise64_64 __ia32_compat_sys_x86_fadvise64_64
273 i386 vserver
274 i386 mbind sys_mbind __ia32_sys_mbind
275 i386 get_mempolicy sys_get_mempolicy __ia32_compat_sys_get_mempolicy
276 i386 set_mempolicy sys_set_mempolicy __ia32_sys_set_mempolicy
277 i386 mq_open sys_mq_open __ia32_compat_sys_mq_open
278 i386 mq_unlink sys_mq_unlink __ia32_sys_mq_unlink
279 i386 mq_timedsend sys_mq_timedsend __ia32_compat_sys_mq_timedsend
280 i386 mq_timedreceive sys_mq_timedreceive __ia32_compat_sys_mq_timedreceive
281 i386 mq_notify sys_mq_notify __ia32_compat_sys_mq_notify
282 i386 mq_getsetattr sys_mq_getsetattr __ia32_compat_sys_mq_getsetattr
283 i386 kexec_load sys_kexec_load __ia32_compat_sys_kexec_load
284 i386 waitid sys_waitid __ia32_compat_sys_waitid
# 285 sys_setaltroot
286 i386 add_key sys_add_key __ia32_sys_add_key
287 i386 request_key sys_request_key __ia32_sys_request_key
288 i386 keyctl sys_keyctl __ia32_compat_sys_keyctl
289 i386 ioprio_set sys_ioprio_set __ia32_sys_ioprio_set
290 i386 ioprio_get sys_ioprio_get __ia32_sys_ioprio_get
291 i386 inotify_init sys_inotify_init __ia32_sys_inotify_init
292 i386 inotify_add_watch sys_inotify_add_watch __ia32_sys_inotify_add_watch
293 i386 inotify_rm_watch sys_inotify_rm_watch __ia32_sys_inotify_rm_watch
294 i386 migrate_pages sys_migrate_pages __ia32_sys_migrate_pages
295 i386 openat sys_openat __ia32_compat_sys_openat
296 i386 mkdirat sys_mkdirat __ia32_sys_mkdirat
297 i386 mknodat sys_mknodat __ia32_sys_mknodat
298 i386 fchownat sys_fchownat __ia32_sys_fchownat
299 i386 futimesat sys_futimesat __ia32_compat_sys_futimesat
300 i386 fstatat64 sys_fstatat64 __ia32_compat_sys_x86_fstatat
301 i386 unlinkat sys_unlinkat __ia32_sys_unlinkat
302 i386 renameat sys_renameat __ia32_sys_renameat
303 i386 linkat sys_linkat __ia32_sys_linkat
304 i386 symlinkat sys_symlinkat __ia32_sys_symlinkat
305 i386 readlinkat sys_readlinkat __ia32_sys_readlinkat
306 i386 fchmodat sys_fchmodat __ia32_sys_fchmodat
307 i386 faccessat sys_faccessat __ia32_sys_faccessat
308 i386 pselect6 sys_pselect6 __ia32_compat_sys_pselect6
309 i386 ppoll sys_ppoll __ia32_compat_sys_ppoll
310 i386 unshare sys_unshare __ia32_sys_unshare
311 i386 set_robust_list sys_set_robust_list __ia32_compat_sys_set_robust_list
312 i386 get_robust_list sys_get_robust_list __ia32_compat_sys_get_robust_list
313 i386 splice sys_splice __ia32_sys_splice
314 i386 sync_file_range sys_sync_file_range __ia32_compat_sys_x86_sync_file_range
315 i386 tee sys_tee __ia32_sys_tee
316 i386 vmsplice sys_vmsplice __ia32_compat_sys_vmsplice
317 i386 move_pages sys_move_pages __ia32_compat_sys_move_pages
318 i386 getcpu sys_getcpu __ia32_sys_getcpu
319 i386 epoll_pwait sys_epoll_pwait __ia32_sys_epoll_pwait
320 i386 utimensat sys_utimensat __ia32_compat_sys_utimensat
321 i386 signalfd sys_signalfd __ia32_compat_sys_signalfd
322 i386 timerfd_create sys_timerfd_create __ia32_sys_timerfd_create
323 i386 eventfd sys_eventfd __ia32_sys_eventfd
324 i386 fallocate sys_fallocate __ia32_compat_sys_x86_fallocate
325 i386 timerfd_settime sys_timerfd_settime __ia32_compat_sys_timerfd_settime
326 i386 timerfd_gettime sys_timerfd_gettime __ia32_compat_sys_timerfd_gettime
327 i386 signalfd4 sys_signalfd4 __ia32_compat_sys_signalfd4
328 i386 eventfd2 sys_eventfd2 __ia32_sys_eventfd2
329 i386 epoll_create1 sys_epoll_create1 __ia32_sys_epoll_create1
330 i386 dup3 sys_dup3 __ia32_sys_dup3
331 i386 pipe2 sys_pipe2 __ia32_sys_pipe2
332 i386 inotify_init1 sys_inotify_init1 __ia32_sys_inotify_init1
333 i386 preadv sys_preadv __ia32_compat_sys_preadv
334 i386 pwritev sys_pwritev __ia32_compat_sys_pwritev
335 i386 rt_tgsigqueueinfo sys_rt_tgsigqueueinfo __ia32_compat_sys_rt_tgsigqueueinfo
336 i386 perf_event_open sys_perf_event_open __ia32_sys_perf_event_open
337 i386 recvmmsg sys_recvmmsg __ia32_compat_sys_recvmmsg
338 i386 fanotify_init sys_fanotify_init __ia32_sys_fanotify_init
339 i386 fanotify_mark sys_fanotify_mark __ia32_compat_sys_fanotify_mark
340 i386 prlimit64 sys_prlimit64 __ia32_sys_prlimit64
341 i386 name_to_handle_at sys_name_to_handle_at __ia32_sys_name_to_handle_at
342 i386 open_by_handle_at sys_open_by_handle_at __ia32_compat_sys_open_by_handle_at
343 i386 clock_adjtime sys_clock_adjtime __ia32_compat_sys_clock_adjtime
344 i386 syncfs sys_syncfs __ia32_sys_syncfs
345 i386 sendmmsg sys_sendmmsg __ia32_compat_sys_sendmmsg
346 i386 setns sys_setns __ia32_sys_setns
347 i386 process_vm_readv sys_process_vm_readv __ia32_compat_sys_process_vm_readv
348 i386 process_vm_writev sys_process_vm_writev __ia32_compat_sys_process_vm_writev
349 i386 kcmp sys_kcmp __ia32_sys_kcmp
350 i386 finit_module sys_finit_module __ia32_sys_finit_module
351 i386 sched_setattr sys_sched_setattr __ia32_sys_sched_setattr
352 i386 sched_getattr sys_sched_getattr __ia32_sys_sched_getattr
353 i386 renameat2 sys_renameat2 __ia32_sys_renameat2
354 i386 seccomp sys_seccomp __ia32_sys_seccomp
355 i386 getrandom sys_getrandom __ia32_sys_getrandom
356 i386 memfd_create sys_memfd_create __ia32_sys_memfd_create
357 i386 bpf sys_bpf __ia32_sys_bpf
358 i386 execveat sys_execveat __ia32_compat_sys_execveat
359 i386 socket sys_socket __ia32_sys_socket
360 i386 socketpair sys_socketpair __ia32_sys_socketpair
361 i386 bind sys_bind __ia32_sys_bind
362 i386 connect sys_connect __ia32_sys_connect
363 i386 listen sys_listen __ia32_sys_listen
364 i386 accept4 sys_accept4 __ia32_sys_accept4
365 i386 getsockopt sys_getsockopt __ia32_compat_sys_getsockopt
366 i386 setsockopt sys_setsockopt __ia32_compat_sys_setsockopt
367 i386 getsockname sys_getsockname __ia32_sys_getsockname
368 i386 getpeername sys_getpeername __ia32_sys_getpeername
369 i386 sendto sys_sendto __ia32_sys_sendto
370 i386 sendmsg sys_sendmsg __ia32_compat_sys_sendmsg
371 i386 recvfrom sys_recvfrom __ia32_compat_sys_recvfrom
372 i386 recvmsg sys_recvmsg __ia32_compat_sys_recvmsg
373 i386 shutdown sys_shutdown __ia32_sys_shutdown
374 i386 userfaultfd sys_userfaultfd __ia32_sys_userfaultfd
375 i386 membarrier sys_membarrier __ia32_sys_membarrier
376 i386 mlock2 sys_mlock2 __ia32_sys_mlock2
377 i386 copy_file_range sys_copy_file_range __ia32_sys_copy_file_range
378 i386 preadv2 sys_preadv2 __ia32_compat_sys_preadv2
379 i386 pwritev2 sys_pwritev2 __ia32_compat_sys_pwritev2
380 i386 pkey_mprotect sys_pkey_mprotect __ia32_sys_pkey_mprotect
381 i386 pkey_alloc sys_pkey_alloc __ia32_sys_pkey_alloc
382 i386 pkey_free sys_pkey_free __ia32_sys_pkey_free
383 i386 statx sys_statx __ia32_sys_statx
384 i386 arch_prctl sys_arch_prctl __ia32_compat_sys_arch_prctl
385 i386 io_pgetevents sys_io_pgetevents __ia32_compat_sys_io_pgetevents
386 i386 rseq sys_rseq __ia32_sys_rseq
424 i386 pidfd_send_signal sys_pidfd_send_signal __ia32_sys_pidfd_send_signal
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