From b3c84ac50cce7f7f9a045a1b8a43adc77408bf6e Mon Sep 17 00:00:00 2001 From: Tad Date: Sun, 18 Dec 2016 09:51:27 -0500 Subject: [PATCH] Misc hardening Change-Id: I19525796263febdcf616fcf82eb5bb714a236a0d --- init/init.cpp | 6 +++--- rootdir/init.rc | 16 ++++++++++++++++ 2 files changed, 19 insertions(+), 3 deletions(-) diff --git a/init/init.cpp b/init/init.cpp index 9992b47..fa82d3b 100755 --- a/init/init.cpp +++ b/init/init.cpp @@ -573,10 +573,10 @@ int main(int argc, char** argv) { mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755"); mkdir("/dev/pts", 0755); mkdir("/dev/socket", 0755); - mount("devpts", "/dev/pts", "devpts", 0, NULL); + mount("devpts", "/dev/pts", "devpts", MS_NOSUID|MS_NOEXEC, NULL); #define MAKE_STR(x) __STRING(x) - mount("proc", "/proc", "proc", 0, "hidepid=2,gid=" MAKE_STR(AID_READPROC)); - mount("sysfs", "/sys", "sysfs", 0, NULL); + mount("proc", "/proc", "proc", MS_NOSUID|MS_NODEV|MS_NOEXEC, "hidepid=2,gid=" MAKE_STR(AID_READPROC)); + mount("sysfs", "/sys", "sysfs", MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL); } // We must have some place other than / to create the device nodes for diff --git a/rootdir/init.rc b/rootdir/init.rc index cd97776..38e68d1 100644 --- a/rootdir/init.rc +++ b/rootdir/init.rc @@ -122,6 +122,7 @@ on init write /proc/sys/kernel/sched_child_runs_first 0 write /proc/sys/kernel/randomize_va_space 2 + write /proc/sys/kernel/dmesg_restrict 1 write /proc/sys/kernel/kptr_restrict 2 write /proc/sys/vm/mmap_min_addr 32768 write /proc/sys/net/ipv4/ping_group_range "0 2147483647" @@ -140,6 +141,21 @@ on init write /proc/sys/net/ipv4/conf/all/accept_redirects 0 write /proc/sys/net/ipv6/conf/all/accept_redirects 0 + # IPv4 hardening + # + # reverse path filtering is done with netfilter for consistency with IPv6 + write /proc/sys/net/ipv4/tcp_rfc1337 1 + write /proc/sys/net/ipv4/conf/all/accept_source_route 0 + write /proc/sys/net/ipv4/conf/default/accept_source_route 0 + write /proc/sys/net/ipv4/conf/default/accept_redirects 0 + write /proc/sys/net/ipv4/conf/all/send_redirects 0 + write /proc/sys/net/ipv4/conf/default/send_redirects 0 + + # IPv6 hardening + write /proc/sys/net/ipv6/conf/default/accept_redirects 0 + write /proc/sys/net/ipv6/conf/all/use_tempaddr 2 + write /proc/sys/net/ipv6/conf/default/use_tempaddr 2 + # Create cgroup mount points for process groups mkdir /dev/cpuctl mount cgroup none /dev/cpuctl cpu -- 2.9.3