Estou fazendo um projeto de depuração para um curso de segurança de computadores, mas descubro que os endereços de memória para determinadas variáveis que estou tentando examinar mudam entre as execuções. Falei com o instrutor e ele sugeriu que desativássemos o ASLR da minha sessão para manter os endereços de memória estáticos para o processo de análise.
Estou executando uma instância do Debian hospedada no Cloud9.
Para conseguir isso, eu uso o comando:
echo 0 | tee /proc/sys/kernel/randomize_va_space
Eu corro este comando na raiz. Quando faço isso, o sistema operacional recupera o erro:
tee: /proc/sys/kernel/randomize_va_space: Read-only file system
Eu entendo ser um comportamento perfeitamente normal, mas não ideal para o que estou tentando fazer.
Como faço para desativar o sinalizador somente leitura no sistema? Eu entendo que mount pode fornecer uma solução, então o seguinte é um dump da saída de mount na minha VM.
none on / type aufs (rw,relatime,si=18e455316acd065c,dio,dirperm1)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev type tmpfs (rw,nosuid,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=666)
sysfs on /sys type sysfs (ro,nosuid,nodev,noexec,relatime)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,relatime,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (ro,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/cpuset type cgroup (ro,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/memory type cgroup (ro,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/blkio type cgroup (ro,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/freezer type cgroup (ro,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (ro,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (ro,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/pids type cgroup (ro,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/perf_event type cgroup (ro,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/devices type cgroup (ro,nosuid,nodev,noexec,relatime,devices)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
/dev/mapper/volg1-lvdata on /mnt type ext4 (ro,relatime,data=ordered)
/dev/mapper/volg1-lvdata on /nix type ext4 (ro,relatime,data=ordered)
/dev/mapper/volg1-lvdata on /mnt/shared type ext4 (ro,relatime,data=ordered)
/dev/mapper/volg1-lvdata on /etc/resolv.conf type ext4 (rw,relatime,data=ordered)
/dev/mapper/volg1-lvdata on /etc/hostname type ext4 (rw,relatime,data=ordered)
/dev/mapper/volg1-lvdata on /etc/hosts type ext4 (rw,relatime,data=ordered)
shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=65536k)
/dev/mapper/volg1-lvdata on /root/.ssh/authorized_keys type ext4 (ro,relatime,data=ordered)
/dev/mapper/volg1-lvdata on /home/ubuntu/.ssh/authorized_keys type ext4 (ro,relatime,data=ordered)
devpts on /dev/console type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
proc on /proc/asound type proc (ro,nosuid,nodev,noexec,relatime)
proc on /proc/bus type proc (ro,nosuid,nodev,noexec,relatime)
proc on /proc/fs type proc (ro,nosuid,nodev,noexec,relatime)
proc on /proc/irq type proc (ro,nosuid,nodev,noexec,relatime)
proc on /proc/sys type proc (ro,nosuid,nodev,noexec,relatime)
proc on /proc/sysrq-trigger type proc (ro,nosuid,nodev,noexec,relatime)
tmpfs on /proc/kcore type tmpfs (rw,nosuid,mode=755)
tmpfs on /proc/timer_list type tmpfs (rw,nosuid,mode=755)
tmpfs on /proc/timer_stats type tmpfs (rw,nosuid,mode=755)
tmpfs on /proc/sched_debug type tmpfs (rw,nosuid,mode=755)
tmpfs on /sys/firmware type tmpfs (ro,relatime)