Yangyu Chen cyyself

We can trust the use of _dl_lookup_symbol_x during elf_machine_runtime_setup in SHARED is safe

Prove

These discussions are based on recent glibc commit a4c414796a.

I know it's hard to prove _dl_lookup_symbol_x being called at elf_machine_runtime_setup without l_relocated == 1 when we have #ifdef SHARED is safe. But if we trust another place it is being called is safe, and there is no change for the requested data structure between these 2 times , then it's natural to trust we call it here is safe.

We can prove this by debugging lib/ld-linux-riscv64-lp64d.so.1 in gdb. First, compile glibc commit a4c414796a with && l->l_relocated removed in sysdeps/riscv/dl-machines.h.

Error log:

➜  ~ systemctl --user status xdg-desktop-portal
● xdg-desktop-portal.service - Portal service
     Loaded: loaded (/usr/lib/systemd/user/xdg-desktop-portal.service; static)
     Active: activating (start) since Tue 2024-11-26 12:41:59 CST; 1min 5s ago

	from pych9329 import HIDController, SerialTransport, CH9329
	import time

	PASSWORD = "123456"

	def xiaomi_devmode(controller):
	# assume it's already in settings
	# press arrow down 3x to enter my device menu
	for i in range(3):
	controller.press("down")

	#!/bin/bash
	set -e

	SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
	KERNEL="${SCRIPT_DIR}/linux/arch/x86/boot/bzImage"
	ROOTFS="${SCRIPT_DIR}/debian-root"
	QMP_SOCK="${SCRIPT_DIR}/.qemu-qmp.sock"

	# Host topology: AMD EPYC 7V73X
	# 1 socket, 8 CCDs (dies), 8 cores/CCD, 2 threads/core = 128 vCPUs

	#!/usr/bin/env python3

	class DTSGen:
	def __init__(self,
	compatible: str = "xiangshan,nemu-board",
	model: str = "XiangShan",
	isa_extensions: list = ["i", "m", "a", "f", "d", "c"],
	mmu_type="riscv,sv39",
	timebase_freq: int = 10000000, # 10 MHz
	nr_harts: int = 1,

	// C++ includes used for precompiling -- C++ --

	// Copyright (C) 2003-2023 Free Software Foundation, Inc.
	//
	// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
	// any later version.

	#!/usr/bin/env python3

	PREFIX = "2001:470:19:a65:"
	SUFFIX = "/64"
	LEN = 14

	print("brctl addbr pathgen")
	print("ip link set pathgen up")
	print("ip addr add %sffff:ffff:ffff:ffff%s dev pathgen" % (PREFIX, SUFFIX))

	#!/usr/bin/env sh
	# Check if multiple IPv6 addresses are assigned to the usb0 interface
	# If so, we have deprecated addresses and need to restart the interface.
	if [ $(cat /proc/net/if_inet6 \| grep usb0 \| wc -l) -gt 2 ]; then
	ifdown wwan6
	ifup wwan6
	fi

	#!/usr/bin/env sh

	wg_filter="wg0 wg1" # EDITME

	current_time=$(date +%s)
	wg show all dump \| awk '{if ($5 != "off") print $1,$6}' \| while read -r each_dump; do
	interface=$(echo $each_dump \| cut -d' ' -f1)
	last_handshake=$(echo $each_dump \| cut -d' ' -f2)
	if echo $wg_filter \| grep -q $interface; then
	if [ $((current_time - last_handshake)) -gt 240 ]; then

	# ip-full kmod-veth iptables-nft ip6tables-mod-nat ip6tables-nft
	ip6tables -t nat -A POSTROUTING -s fd05::1/64 -j MASQUERADE
	ip link add 5g_lan type veth peer 5g_lan_peer
	ip netns add 5g_lan
	ip link set dev 5g_lan_peer netns 5g_lan
	ip netns exec 5g_lan sh <<EOF
	sysctl -w net.ipv4.conf.all.forwarding=1
	sysctl -w net.ipv6.conf.all.forwarding=1
	ip link set dev lo up
	ip link set dev 5g_lan_peer up

Yangyu Chen cyyself

Prove

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Error log: