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Update README.md

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Raja Grewal 2022-07-13 22:25:53 +10:00
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@ -40,6 +40,8 @@ arbitrary code execution in kernel mode.
* The bits of entropy used for mmap ASLR are increased, therefore improving
its effectiveness.
* Randomises the addresses for mmap base, heap, stack, and VDSO pages.
* Prevents unintentional writes to attacker-controlled files.
* Prevents common symlink and hardlink TOCTOU races.
@ -54,19 +56,13 @@ prevents writing potentially sensitive contents of memory to disk.
### Boot parameters
Boot parameters are configured via the `/etc/modprobe.d/30_security-misc.conf`
configuration file.
Boot parameters are outlined in configuration files located in the
`etc/default/grub.d/` directory.
* Slab merging is disabled which significantly increases the difficulty of
heap exploitation by preventing overwriting objects from merged caches and
by making it harder to influence slab cache layout.
* Sanity checks are enabled which add various checks to prevent corruption
in certain slab operations.
* Redzoning is enabled which adds extra areas around slabs that detect when
a slab is overwritten past its real size which can help detect overflows.
* Memory zeroing at allocation and free time is enabled to mitigate some
use-after-free vulnerabilities and erase sensitive information in memory.
@ -83,10 +79,15 @@ are a potential target for ROP.
* The kernel panics on oopses to thwart certain kernel exploits.
* Enables randomisation of the kernel stack offset on syscall entries.
* All mitigations for known CPU vulnerabilities are enabled and SMT is
disabled.
* IOMMU is enabled to prevent DMA attacks.
* IOMMU is enabled to prevent DMA attacks along with strict enforcement of IOMMU
TLB invalidation so devices will never be able to access stale data contents.
* Distrust the 'randomly' generated CPU and bootloader seeds.
### Blacklisted kernel modules