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https://github.com/Divested-Mobile/DivestOS-Build.git
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49 lines
2.0 KiB
Diff
49 lines
2.0 KiB
Diff
From 2e95e6719f4eebd292c691d2b4d4f5697477b191 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 mounts
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Change-Id: Idd2da6d9989ec554ce5b0841781d323fdcd9eb87
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---
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init/init.cpp | 6 +++---
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rootdir/init.rc | 1 +
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2 files changed, 4 insertions(+), 3 deletions(-)
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diff --git a/init/init.cpp b/init/init.cpp
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index 35fc442d0..b65686f93 100644
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--- a/init/init.cpp
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+++ b/init/init.cpp
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@@ -1019,14 +1019,14 @@ int main(int argc, char** argv) {
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mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755");
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mkdir("/dev/pts", 0755);
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mkdir("/dev/socket", 0755);
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- mount("devpts", "/dev/pts", "devpts", 0, NULL);
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+ mount("devpts", "/dev/pts", "devpts", MS_NOSUID|MS_NOEXEC, NULL);
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#define MAKE_STR(x) __STRING(x)
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- mount("proc", "/proc", "proc", 0, "hidepid=2,gid=" MAKE_STR(AID_READPROC));
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+ mount("proc", "/proc", "proc", MS_NOSUID|MS_NODEV|MS_NOEXEC, "hidepid=2,gid=" MAKE_STR(AID_READPROC));
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// Don't expose the raw commandline to unprivileged processes.
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chmod("/proc/cmdline", 0440);
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gid_t groups[] = { AID_READPROC };
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setgroups(arraysize(groups), groups);
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- mount("sysfs", "/sys", "sysfs", 0, NULL);
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+ mount("sysfs", "/sys", "sysfs", MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL);
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mount("selinuxfs", "/sys/fs/selinux", "selinuxfs", 0, NULL);
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mknod("/dev/kmsg", S_IFCHR | 0600, makedev(1, 11));
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mknod("/dev/random", S_IFCHR | 0666, makedev(1, 8));
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diff --git a/rootdir/init.rc b/rootdir/init.rc
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index eca160771..8e2f5a124 100644
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--- a/rootdir/init.rc
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+++ b/rootdir/init.rc
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@@ -124,6 +124,7 @@ 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/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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2.16.1
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