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https://github.com/Divested-Mobile/DivestOS-Build.git
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58 lines
2.5 KiB
Diff
58 lines
2.5 KiB
Diff
From 29240bc6aa37804757682d100fcf7484c8fb1122 Mon Sep 17 00:00:00 2001
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From: Daniel Micay <danielmicay@gmail.com>
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Date: Mon, 12 Feb 2018 03:29:58 -0500
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Subject: [PATCH] Harden
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Change-Id: Idd2da6d9989ec554ce5b0841781d323fdcd9eb87
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---
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init/first_stage_init.cpp | 6 +++---
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rootdir/init.rc | 9 +++++++++
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2 files changed, 12 insertions(+), 3 deletions(-)
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diff --git a/init/first_stage_init.cpp b/init/first_stage_init.cpp
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index 2b899408a..84c2735c2 100644
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--- a/init/first_stage_init.cpp
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+++ b/init/first_stage_init.cpp
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@@ -120,15 +120,15 @@ int FirstStageMain(int argc, char** argv) {
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CHECKCALL(mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755"));
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CHECKCALL(mkdir("/dev/pts", 0755));
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CHECKCALL(mkdir("/dev/socket", 0755));
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- CHECKCALL(mount("devpts", "/dev/pts", "devpts", 0, NULL));
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+ CHECKCALL(mount("devpts", "/dev/pts", "devpts", MS_NOSUID|MS_NOEXEC, NULL));
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#define MAKE_STR(x) __STRING(x)
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- CHECKCALL(mount("proc", "/proc", "proc", 0, "hidepid=2,gid=" MAKE_STR(AID_READPROC)));
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+ CHECKCALL(mount("proc", "/proc", "proc", MS_NOSUID|MS_NODEV|MS_NOEXEC, "hidepid=2,gid=" MAKE_STR(AID_READPROC)));
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#undef MAKE_STR
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// Don't expose the raw commandline to unprivileged processes.
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CHECKCALL(chmod("/proc/cmdline", 0440));
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gid_t groups[] = {AID_READPROC};
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CHECKCALL(setgroups(arraysize(groups), groups));
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- CHECKCALL(mount("sysfs", "/sys", "sysfs", 0, NULL));
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+ CHECKCALL(mount("sysfs", "/sys", "sysfs", MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL));
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CHECKCALL(mount("selinuxfs", "/sys/fs/selinux", "selinuxfs", 0, NULL));
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CHECKCALL(mknod("/dev/kmsg", S_IFCHR | 0600, makedev(1, 11)));
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--- a/rootdir/init.rc
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+++ b/rootdir/init.rc
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@@ -140,6 +140,17 @@ on init
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write /proc/sys/kernel/sched_wakeup_granularity_ns 2000000
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write /proc/sys/kernel/sched_child_runs_first 0
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+ write /proc/sys/kernel/dmesg_restrict 1
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+ write /proc/sys/fs/protected_hardlinks 1
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+ write /proc/sys/fs/protected_symlinks 1
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+ write /proc/sys/fs/protected_fifos 1
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+ write /proc/sys/fs/protected_regular 1
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+ write /proc/sys/net/ipv6/conf/all/use_tempaddr 2
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+ write /proc/sys/net/ipv6/conf/all/max_addresses 128
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+ write /proc/sys/net/ipv6/conf/all/temp_prefered_lft 21600
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+ write /proc/sys/net/ipv6/conf/default/use_tempaddr 2
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+ write /proc/sys/net/ipv6/conf/default/max_addresses 128
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+ write /proc/sys/net/ipv6/conf/default/temp_prefered_lft 21600
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write /proc/sys/kernel/randomize_va_space 2
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write /proc/sys/vm/mmap_min_addr 32768
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write /proc/sys/net/ipv4/ping_group_range "0 2147483647"
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--
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2.26.0
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