wataash/wsl-glibc-2.31-hack.sh

## wsl-glibc-2.31-hack.sh
# MIT License
#
# Copyright (c) 2020 Wataru Ashihara
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

# https://qiita.com/mmns/items/eaf42dd3345a2285ff9e
# https://twitter.com/wata_ash/status/1255130650723487746
# 筆者はWindowsを持っていなくてUbuntuでしか試していない。
# 高確率で環境破壊するので自己責任でお願いします。

# ------------------------------------------------------------------------------
# 環境の確認

cat /etc/lsb-release  # DISTRIB_DESCRIPTION="Ubuntu 20.04"
# md5sum が異なったら終了して下さい。（そしてできれば教えて下さい）
md5sum /usr/lib/x86_64-linux-gnu/libc-2.31.so  # 10fdeb77eea525914332769e9cd912ae

# ------------------------------------------------------------------------------
# バグの確認

echo > a.c '
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main(int argc, char *argv[]) {
  const struct timespec ts = {.tv_sec = 1};
  printf("sleep 1\n");
  if (nanosleep(&ts, NULL) == -1) {
    perror("nanosleep");
    exit(EXIT_FAILURE);
  }
  printf("done\n");
}'

cc a.c
./a.out
# 通常のUbuntuなら1秒スリープするが、
# WSLだと nanosleep: Invalid argument と出力してすぐ終了すると思われる

# ------------------------------------------------------------------------------
# HACK

cp -v /usr/lib/x86_64-linux-gnu/libc-2.31.so ./libc-2.31.so.work.0.realtime.orig
cp -v /usr/lib/x86_64-linux-gnu/libc-2.31.so ./libc-2.31.so.work.1.monotonic
cp -v /usr/lib/x86_64-linux-gnu/libc-2.31.so ./libc-2.31.so.work.7.boottime

echo -en '\xbf\x01\x00\x00\x00' | dd seek=918244 bs=1 count=5 of=./libc-2.31.so.work.1.monotonic
dd skip=918249 seek=918249 bs=1 if=./libc-2.31.so.work.0.realtime.orig of=./libc-2.31.so.work.1.monotonic

echo -en '\xbf\x07\x00\x00\x00' | dd seek=918244 bs=1 count=5 of=./libc-2.31.so.work.7.boottime
dd skip=918249 seek=918249 bs=1 if=./libc-2.31.so.work.0.realtime.orig of=./libc-2.31.so.work.7.boottime

# ------------------------------------------------------------------------------
# 確認

ls -l ./libc*  # 全て 2029224 バイト
md5sum ./libc-2.31.so.work.0.realtime.orig  # 10fdeb77eea525914332769e9cd912ae
md5sum ./libc-2.31.so.work.1.monotonic      # a3de8ddf981b31db75c2e14fb9a330c8
md5sum ./libc-2.31.so.work.7.boottime       # cc62215f49f8f229f8294c005ef5ec51

# objdump --disassemble=clock_nanosleep ./libc-2.31.so.work.0.original
# objdump --disassemble=clock_nanosleep ./libc-2.31.so.work.1.monotonic
# objdump --disassemble=clock_nanosleep ./libc-2.31.so.work.7.boottime

# ------------------------------------------------------------------------------
# Install・ためす (キケン)

# 直接cpしないこと！！死にます（コメント参照）
cp -v ./libc-2.31.so.work.1.monotonic tmp && sudo mv -v tmp /usr/lib/x86_64-linux-gnu/libc-2.31.so
./a.out  # 1秒sleepすればOK

cp -v ./libc-2.31.so.work.7.boottime  tmp && sudo mv -v tmp /usr/lib/x86_64-linux-gnu/libc-2.31.so
./a.out  # 1秒sleepすればOK

# ------------------------------------------------------------------------------
# もどす場合
cp -v ./libc-2.31.so.work.0.orig      tmp && sudo mv -v tmp /usr/lib/x86_64-linux-gnu/libc-2.31.so
./a.out  # EINVAL
	# MIT License
	#
	# Copyright (c) 2020 Wataru Ashihara
	#
	# Permission is hereby granted, free of charge, to any person obtaining a copy
	# of this software and associated documentation files (the "Software"), to deal
	# in the Software without restriction, including without limitation the rights
	# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	# copies of the Software, and to permit persons to whom the Software is
	# furnished to do so, subject to the following conditions:
	#
	# The above copyright notice and this permission notice shall be included in all
	# copies or substantial portions of the Software.
	#
	# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	# SOFTWARE.

	# https://qiita.com/mmns/items/eaf42dd3345a2285ff9e
	# https://twitter.com/wata_ash/status/1255130650723487746
	# 筆者はWindowsを持っていなくてUbuntuでしか試していない。
	# 高確率で環境破壊するので自己責任でお願いします。

	# ------------------------------------------------------------------------------
	# 環境の確認

	cat /etc/lsb-release # DISTRIB_DESCRIPTION="Ubuntu 20.04"
	# md5sum が異なったら終了して下さい。（そしてできれば教えて下さい）
	md5sum /usr/lib/x86_64-linux-gnu/libc-2.31.so # 10fdeb77eea525914332769e9cd912ae

	# ------------------------------------------------------------------------------
	# バグの確認

	echo > a.c '
	#include <errno.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <time.h>
	int main(int argc, char *argv[]) {
	const struct timespec ts = {.tv_sec = 1};
	printf("sleep 1\n");
	if (nanosleep(&ts, NULL) == -1) {
	perror("nanosleep");
	exit(EXIT_FAILURE);
	}
	printf("done\n");
	}'

	cc a.c
	./a.out
	# 通常のUbuntuなら1秒スリープするが、
	# WSLだと nanosleep: Invalid argument と出力してすぐ終了すると思われる

	# ------------------------------------------------------------------------------
	# HACK

	cp -v /usr/lib/x86_64-linux-gnu/libc-2.31.so ./libc-2.31.so.work.0.realtime.orig
	cp -v /usr/lib/x86_64-linux-gnu/libc-2.31.so ./libc-2.31.so.work.1.monotonic
	cp -v /usr/lib/x86_64-linux-gnu/libc-2.31.so ./libc-2.31.so.work.7.boottime

	echo -en '\xbf\x01\x00\x00\x00' \| dd seek=918244 bs=1 count=5 of=./libc-2.31.so.work.1.monotonic
	dd skip=918249 seek=918249 bs=1 if=./libc-2.31.so.work.0.realtime.orig of=./libc-2.31.so.work.1.monotonic

	echo -en '\xbf\x07\x00\x00\x00' \| dd seek=918244 bs=1 count=5 of=./libc-2.31.so.work.7.boottime
	dd skip=918249 seek=918249 bs=1 if=./libc-2.31.so.work.0.realtime.orig of=./libc-2.31.so.work.7.boottime

	# ------------------------------------------------------------------------------
	# 確認

	ls -l ./libc* # 全て 2029224 バイト
	md5sum ./libc-2.31.so.work.0.realtime.orig # 10fdeb77eea525914332769e9cd912ae
	md5sum ./libc-2.31.so.work.1.monotonic # a3de8ddf981b31db75c2e14fb9a330c8
	md5sum ./libc-2.31.so.work.7.boottime # cc62215f49f8f229f8294c005ef5ec51

	# objdump --disassemble=clock_nanosleep ./libc-2.31.so.work.0.original
	# objdump --disassemble=clock_nanosleep ./libc-2.31.so.work.1.monotonic
	# objdump --disassemble=clock_nanosleep ./libc-2.31.so.work.7.boottime

	# ------------------------------------------------------------------------------
	# Install・ためす (キケン)

	# 直接cpしないこと！！死にます（コメント参照）
	cp -v ./libc-2.31.so.work.1.monotonic tmp && sudo mv -v tmp /usr/lib/x86_64-linux-gnu/libc-2.31.so
	./a.out # 1秒sleepすればOK

	cp -v ./libc-2.31.so.work.7.boottime tmp && sudo mv -v tmp /usr/lib/x86_64-linux-gnu/libc-2.31.so
	./a.out # 1秒sleepすればOK

	# ------------------------------------------------------------------------------
	# もどす場合
	cp -v ./libc-2.31.so.work.0.orig tmp && sudo mv -v tmp /usr/lib/x86_64-linux-gnu/libc-2.31.so
	./a.out # EINVAL