Commit Graph

8 Commits

Author SHA1 Message Date
Peter Müller
883e29630c Kernel: Disable support for RPC dprintk debugging
This is solely needed for debugging of NFS issues. Due to the attack
surface it introduces, grsecurity recommends to disable it; as we do not
have a strict necessity for this feature, it is best to follow that
recommendation for security reasons.

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
2022-06-13 15:39:23 +00:00
Peter Müller
9b28e9d02b Kernel: Enable YAMA support
See https://www.kernel.org/doc/html/latest/admin-guide/LSM/Yama.html for
the upstream rationale. Enabling YAMA gives us the benefit of additional
hardening options available, without any obvious downsides.

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
2022-06-13 15:39:08 +00:00
Peter Müller
250f6efc38 kernel: Do not enforce "integrity" mode of LSM
LSM was found to render firmware flashing unusable, and patching out LSM
functionality for all features needed (such as /dev/io, direct memory
access and probably raw PCI access for older cards), this would
effectively render much of LSM's functionality useless as well.

For the time being, we do ship LSM, but do not enforce any protection
mode. Users hence can run it in "integrity" or even "confidentiality"
mode by custom commands; hopefully, we will be able to revert this
change at a future point.

Acked-by: Arne Fitzenreiter <arne.fitzenreiter@ipfire.org>
Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
2022-04-21 19:30:42 +00:00
Peter Müller
8e1a464d12 Kernel: Enable LSM support and set security level to "integrity"
Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
2022-04-06 20:04:04 +00:00
Peter Müller
4f4422cc1c Kernel: Do not automatically load TTY line disciplines, only if necessary
Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
2022-04-04 19:59:39 +00:00
Peter Müller
bf2d8cb8a0 Kernel: Disable support for tracing block I/O actions
This is not needed on IPFire systems, and grsecurity recommends to turn
this off.

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
2022-04-04 19:59:15 +00:00
Peter Müller
26ca63592d Kernel: Set CONFIG_ARCH_MMAP_RND_BITS to 32 bits
This follows a recommendation by ClipOS, making ASLR bypassing attempts
harder.

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
2022-04-04 19:59:08 +00:00
Michael Tremer
5c1a1094ed kernel: Add a basic configuration for riscv64
This kernel configuration is a copy of our kernel configuration for
x86_64 on which I ran "make olddefconfig" which will set any unknown
values to their defaults.

This exists so that we have some kernel (which I did not try to boot) to
complete the build process.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
2022-02-22 19:41:39 +00:00