This commits adds a basic infrastructure to support Address Space
Randomization (ASR). In a nutshell, using the already imported ASR
LLVM pass, multiple versions can be generated for the same system
service, each with a randomized, different address space layout.
Combined with the magic instrumentation for state transfer, a system
service can be live updated into another ASR-randomized version at
runtime, thus providing live rerandomization.
Since MINIX3 is not yet capable of running LLVM linker passes, the
ASR-randomized service binaries have to be pregenerated during
crosscompilation. These pregenerated binaries can then be cycled
through at runtime. This patch provides the basic proof-of-concept
infrastructure for both these parts.
In order to support pregeneration, the clientctl host script has
been extended with a "buildasr" command. It is to be used after
building the entire system with bitcode and magic support, and will
produce a given number of ASR-randomized versions of all system
services. These services are placed in /usr/service/asr in the
image that is generated as final step by the "buildasr" command.
In order to support runtime updating, a new update_asr(8) command
has been added to MINIX3. This command attempts to live-update the
running system services into their next ASR-randomized versions.
For now, this command is not run automatically, and thus must be
invoked manually.
Technical notes:
- For various reasons, magic instrumentation is x86-only for now,
and ASR functionality is therefore to be used on x86 only as well.
- The ASR-randomized binaries are placed in numbered subdirectories
so as not to have to change their actual program names, which are
assumed to be static in various places (system.conf, procfs).
- The root partition is typically too small to contain all the
produced binaries, which is why we introduce /usr/service. There
is a symlink from /service/asr to /usr/service/asr for no other
reason than to let userland continue to assume that all services
are reachable through /service.
- The ASR count field (r_asr_count/ASRcount) maintained by RS is not
used within RS in any way; it is only passed through procfs to
userland in order to allow update_asr(8) to keep track of which
version is currently loaded without having to maintain own state.
- Ideally, pre-instrumentation linking of a service would remove all
its randomized versions. Currently, the user is assumed not to
perform ASR instrumentation and then recompile system services
without performing ASR instrumentation again, as the randomized
binaries included in the image would then be stale. This aspect
has to be improved later.
- Various other issues are flagged in the comments of the various
parts of this patch.
Change-Id: I093ad57f31c18305591f64b2d491272288aa0937
Make disk image size sufficient for LLVM bitcode build with symbols.
Edited by David van Moolenbroek to do this only when -b is given.
Change-Id: I3bde164756c477b4af5ed9435ca03da3b186cf7e
- Fix a bug in clientctl which tried to test for kvm. This simply
remove this faulty test as the kvm command has been deprecated by the
QEMU project for a couple of years now.
- Specify by default 256M of RAM as this is the minimal amount required
for the whole-OS live update test to succeed.
- Update the default command printed out at the end of the x86_hdimage
script to be more generic, less focused on one use-case.
Change-Id: Ic555d50a3a1471f7d35cc7fd369f2292add6ac39
This patch adds support for Unix98 pseudo terminals, that is,
posix_openpt(3), grantpt(3), unlockpt(3), /dev/ptmx, and /dev/pts/.
The latter is implemented with a new pseudo file system, PTYFS.
In effect, this patch adds secure support for unprivileged pseudo
terminal allocation, allowing programs such as tmux(1) to be used by
non-root users as well. Test77 has been extended with new tests, and
no longer needs to run as root.
The new functionality is optional. To revert to the old behavior,
remove the "ptyfs" entry from /etc/fstab.
Technical nodes:
o The reason for not implementing the NetBSD /dev/ptm approach is that
implementing the corresponding ioctl (TIOCPTMGET) would require
adding a number of extremely hairy exceptions to VFS, including the
PTY driver having to create new file descriptors for its own device
nodes.
o PTYFS is required for Unix98 PTYs in order to avoid that the PTY
driver has to be aware of old-style PTY naming schemes and even has
to call chmod(2) on a disk-backed file system. PTY cannot be its
own PTYFS since a character driver may currently not also be a file
system. However, PTYFS may be subsumed into a DEVFS in the future.
o The Unix98 PTY behavior differs somewhat from NetBSD's, in that
slave nodes are created on ptyfs only upon the first call to
grantpt(3). This approach obviates the need to revoke access as
part of the grantpt(3) call.
o Shutting down PTY may leave slave nodes on PTYFS, but once PTY is
restarted, these leftover slave nodes will be removed before they
create a security risk. Unmounting PTYFS will make existing PTY
slaves permanently unavailable, and absence of PTYFS will block
allocation of new Unix98 PTYs until PTYFS is (re)mounted.
Change-Id: I822b43ba32707c8815fd0f7d5bb7a438f51421c1
This allows to both override the default package repository and
preinstalled packages list from the command line or the environment.
Also use everywhere PACKAGEURL.
Change-Id: I3434ff53be769f8d0f890bb5fb44521a0017e123
This allows the URL used to clone our specific version of u-boot to be
specified in the environment, instead of being hard-coded.
This new flexibility will be required by the new Continuous Integration
infrastructure, whose test nodes are in a network without direct
internet access.
Change-Id: I7440b5bba6786f979623b4509111e4e99c6558f6
. bitcode fixes
. switch to compiler-rt instead of netbsd libc functions
or libgcc for support functions for both x86 and arm
. minor build fixes
. allow build with llvm without crossbuilding llvm itself
. can now build minix/arm using llvm and eabi - without C++
support for now (hence crossbuilding llvm itself is turned off
for minix/arm)
Change-Id: If5c44ef766f5b4fc4394d4586ecc289927a0d6eb
- Fixed missing variable interpolation because of single quotes
- Replaced /bin/sh in gen_uEnv.txt.sh with /usr/bin/env bash as the default
echo doesn't support '-n'
- Fixed some whitespace errors
- A succesful build requires for now to skip the gold linker on OSX.
Change-Id: Id09bf52f45252026e3a58b74e8448ea24a0dab12
. let you specify IMG as a block device directly. this minimizes
i/o (only write used parts of the filesystem) and so turnaround
time - while still allowing the big default FS size.
Change-Id: Ib738499464e0d350a474a706f688d3f10806207d
. source release.functions with explicit path
. make xargs touch not fail (due to too long invocations
and spaces in paths)
Change-Id: I448b96cebd641bf2c7b86ecbb3d1f1cb568e4f70
- Removed an "export CPPFLAGS=${FLAG}" which prevented proper settings
from the environment to be passed to the build step.
- Re-arranged variable settings at the top, so that we don't need
to evaluate the argument to vfat mkfs command anymore in
arm_sdimage.sh
- "Merged" both script for easier comparison in the future.
Change-Id: Id59f902e4eaeb7f268d5051789462f14421a114a
As we have switched to a local git repository containing the NetBSD
reference, at specific points in time, the following scripts are not
anymore useful.
Change-Id: Iec0606a640a73e6ce80ecc5d9ac438daab9f2a1f
. we need libc++ in the base system
. big packages & sources don't fit on the cd any more
. the fetch scripts have to be triggered for some tools
Change-Id: Ife53c64fda0ed65b96fa8d6a0b0fee2c6a14d6d7
Allows instrumentation of Minix components using LLVM passes from
"llvm-apps" repository
In addition, the change does the following:
1. Move releasetools/generate_gold_plugin.sh to minix/llvm
2. Move external/bsd/llvm/passes to minix/llvm/passes
3. libLTO.so, LLVMgold.so and WeakAliasModuleOverride.so files
now get installed in minix/llvm/bin
This patch is a ugly, but a this moment I have no better alternatives to
offer.
- Add a script to compile the llvm sources through the standard
makefiles instead of the bsd build system. The produced gold plugin
is then copied into the source tree and used from there by the BSD
Makefiles.
Change-Id: I7fd7ad80be8efcedf27a047b872930ed602d7874
Rreleasetools/arm_sdimage.sh uses a ".settings" file to allow to override
the defaults settings found in arm_sdimage. This change allows to use an
alternate file for this purpose. We figured out more programs (like eclipse)
use a ".settings" file.
One can tweak the settings files to use by settings the SETTINGS_MINIX
variable
SETTING_MINIX=.settings_minix
Change-Id: I57f5ca64d2ac27c9e015ab24b864b9a5f14c42fb
http://gerrit.minix3.org/#/c/2687/
Check if the .settings entry is a file and not a directory. Eclipse
as we found out also likes creating .settings directories.
Change-Id: I3cbcaa7aa9e5dfb3d51c6c71df7fd72079fe213e
tests many complex system/process memory interaction cases.
has to run as root so it can flush the FS cache; needed to
force FS cache misses for unmapped pages.
See the comment in test74.c for a full description of what the tested
cases are.
also re-enable filemap on arm
The syntax of the stat(1) command varies between Linux and FreeBSD.
This prevented `x86_hdimage.sh -i` from succeeding on FreeBSD 10.0.
The fix is to use the NetBSD stat from the tooldir for all systems.
Change-Id: I121e5fd36b0d4a944ba0109cf58095ab7d150847
