glibc/sysdeps/unix/sysv/linux
H.J. Lu 5d844e1b72 i386: Enable CET support in ucontext functions
1. getcontext and swapcontext are updated to save the caller's shadow
stack pointer and return address.
2. setcontext and swapcontext are updated to restore shadow stack and
jump to new context directly.
3. makecontext is updated to allocate a new shadow stack and set the
caller's return address to the helper code, L(exitcode).
4. Since we no longer save and restore EAX, ECX and EDX in getcontext,
setcontext and swapcontext, we can use them as scratch register slots
to enable CET in ucontext functions.

Since makecontext allocates a new shadow stack when making a new
context and kernel allocates a new shadow stack for clone/fork/vfork
syscalls, we track the current shadow stack base.  In setcontext and
swapcontext, if the target shadow stack base is the same as the current
shadow stack base, we unwind the shadow stack.  Otherwise it is a stack
switch and we look for a restore token.

We enable shadow stack at run-time only if program and all used shared
objects, including dlopened ones, are shadow stack enabled, which means
that they must be compiled with GCC 8 or above and glibc 2.28 or above.
We need to save and restore shadow stack only if shadow stack is enabled.
When caller of getcontext, setcontext, swapcontext and makecontext is
compiled with smaller ucontext_t, shadow stack won't be enabled at
run-time.  We check if shadow stack is enabled before accessing the
extended field in ucontext_t.

Tested on i386 CET/non-CET machines.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2020-02-14 15:15:25 -08:00
..
aarch64 Update syscall lists for Linux 5.5. 2020-02-07 13:54:58 +00:00
alpha Use gcc -finput-charset=ascii for check-installed-headers. 2020-02-13 17:32:00 +01:00
arm linux: Enable vDSO clock_gettime64 for arm 2020-01-03 11:22:07 -03:00
bits Use gcc -finput-charset=ascii for check-installed-headers. 2020-02-13 17:32:00 +01:00
csky Linux: Add tables with system call numbers 2020-01-02 10:18:10 +01:00
generic y2038: Define __suseconds64_t type to be used with struct __timeval64 2020-02-07 17:55:07 +01:00
hppa Linux: Use system call tables during build 2020-01-02 10:18:23 +01:00
i386 i386: Enable CET support in ucontext functions 2020-02-14 15:15:25 -08:00
ia64 Linux: Remove pread/pread64, pwrite/pwrite64 kludges from <sysdep.h> 2020-01-02 10:18:37 +01:00
include Linux: Use system call tables during build 2020-01-02 10:18:23 +01:00
m68k Linux: Add tables with system call numbers 2020-01-02 10:18:10 +01:00
microblaze Linux: Add tables with system call numbers 2020-01-02 10:18:10 +01:00
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profil-counter.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
profil.c
pselect.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pt-raise.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pthread_getaffinity.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pthread_getcpuclockid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pthread_getname.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pthread_kill.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pthread_setaffinity.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pthread_setname.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pthread_sigqueue.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pthread-pids.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ptrace.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ptsname.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pwrite64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pwrite.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pwritev2.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pwritev64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pwritev64v2.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
pwritev.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
raise.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
read_nocancel.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
read.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
readahead.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
readdir64_r.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
readdir64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
readdir_r.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
readdir.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
readonly-area.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
readv.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
reboot.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
recv.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
recvfrom.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
recvmmsg.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
recvmsg.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
remove.c
rename.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
renameat2.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
renameat.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sa_len.c
safe-fatal.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
scandir64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sched_getaffinity.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sched_getcpu.c linux: Fix vDSO macros build with time64 interfaces 2020-01-03 10:02:05 -03:00
sched_rr_gi.c y2038: linux: Provide __sched_rr_get_interval64 implementation 2020-02-02 11:23:50 +01:00
sched_setaffinity.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
segfault.c
select.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
semctl.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
semget.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
semop.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
semtimedop.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
send.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sendmmsg.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sendmsg.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sendto.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setegid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
seteuid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setgid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setgroups.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sethostid.c
setipv4sourcefilter.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setregid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setresgid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setresuid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setreuid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setrlimit64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setrlimit.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setsockopt.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setsourcefilter.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
settimeofday.c y2038: linux: Provide __settimeofday64 implementation 2020-02-07 17:55:08 +01:00
settimezone.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
setuid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
shlib-versions
shm-directory.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
shmat.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
shmctl.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
shmdt.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
shmget.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
shutdown.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigaction.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
siglist.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
signal.c
signalfd.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigpending.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigprocmask.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigqueue.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigreturn.c
sigset-cvt-mask.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigsetops.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigstack.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigsuspend.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigtimedwait.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigwait.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sigwaitinfo.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
single-thread.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sizes.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
socket.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
socketcall.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
socketpair.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
spawni.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
speed.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
splice.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
statfs64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
statvfs64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
statvfs.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
statx_cp.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
statx_cp.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
statx.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sync_file_range.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
syscall-names.list Update syscall lists for Linux 5.5. 2020-02-07 13:54:58 +00:00
syscalls.list y2038: linux: Provide __sched_rr_get_interval64 implementation 2020-02-02 11:23:50 +01:00
sysconf.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sysctl.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sysctl.mk
sysdep-cancel.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
sysdep-vdso.h elf: Move vDSO setup to rtld (BZ#24967) 2020-01-03 11:22:07 -03:00
sysdep.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
syslog.c
tcdrain.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tcflow.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tcflush.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tcgetattr.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tcgetpgrp.c
tcsendbrk.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tcsetattr.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tcsetpgrp.c
tee.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
termio.h
test-errno-linux.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
time-clockid.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
time.c elf: Move vDSO setup to rtld (BZ#24967) 2020-01-03 11:22:07 -03:00
timer_create.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
timer_delete.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
timer_getoverr.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
timer_gettime.c rt: avoid PLT setup in timer_[sg]ettime 2020-02-03 12:16:09 +01:00
timer_routines.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
timer_settime.c rt: avoid PLT setup in timer_[sg]ettime 2020-02-03 12:16:09 +01:00
timerfd_gettime.c y2038: linux: Provide __timerfd_gettime64 implementation 2020-02-02 11:23:23 +01:00
timerfd_settime.c y2038: linux: Provide __timerfd_settime64 implementation 2020-02-02 11:23:23 +01:00
times.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
timespec_get.c y2038: linux: Provide __timespec_get64 implementation 2020-02-05 00:10:16 +01:00
truncate64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
truncate.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-affinity-pid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-affinity-static.c Enable VDSO on x86_64 statically linked programs [BZ #19767] 2018-11-23 16:50:29 -08:00
tst-affinity.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-align-clone.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-clone2.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-clone3.c tst-clone3: Use __NR_futex_time64 if we don't have __NR_futex 2020-02-14 14:40:34 -08:00
tst-clone.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-fallocate64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-fallocate-common.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-fallocate.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-fanotify.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-getdents64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-getpid1.c
tst-gettid-kill.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-gettid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-glibcsyscalls.py Linux: Add tables with system call numbers 2020-01-02 10:18:10 +01:00
tst-memfd_create.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-mlock2.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-mman-consts.py Update kernel version to 5.5 in tst-mman-consts.py. 2020-02-07 13:55:29 +00:00
tst-o_path-locks.c Linux: Add io/tst-o_path-locks test 2020-02-09 11:51:08 +01:00
tst-ofdlocks-compat.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-ofdlocks.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-personality.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-pkey.c Fix tst-pkey.c pkey_alloc return checks and manual 2020-01-17 09:05:03 -03:00
tst-quota.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-readdir64-compat.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-rlimit-infinity.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-setgetname.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-sigcontext-get_pc.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-signal-numbers.py Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-skeleton-affinity.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-skeleton-thread-affinity.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-socket-consts.py Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-sync_file_range.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-syscall-list.sh Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-sysconf-iov_max-uapi.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-sysconf-iov_max.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-tgkill.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-thread-affinity-pthread2.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-thread-affinity-pthread.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-thread-affinity-sched.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
tst-ttyname.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ttyname_r.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ttyname.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ttyname.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ualarm.c
umount2.S
umount.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
unlockpt.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
update-syscall-lists.py Linux: Add tables with system call numbers 2020-01-02 10:18:10 +01:00
updwtmp.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
ustat.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
utimensat.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
utimes.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
utmp_file.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
Versions Add nocancel version of pread64() 2019-10-18 15:55:33 -04:00
versionsort64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
vfork.c
vmsplice.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
wait4.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
waitid.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
write_nocancel.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
write.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
writev.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
xmknod.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
xmknodat.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
xstat64.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
xstat.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
xstatconv.c Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
xstatconv.h Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00