Slab freelist randomization
Webb3 apr. 2024 · The random > selection is based on the location of code that calls `kmalloc ()`, which > means it is static at runtime (rather than dynamically determined at > each time of allocation, which could be bypassed by repeatedly spraying > in brute force). In this way, the vulnerable object and memory allocated Webb> Provide an optional config (CONFIG_FREELIST_RANDOM) to randomize the > SLAB freelist. It may be useful to describe _how_ it randomizes it (i.e. a high-level description …
Slab freelist randomization
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Webb18 maj 2016 · This is RFC v1 for the SLUB Freelist randomization. ***Background: This proposal follows the previous SLAB Freelist patch submitted to next. It resuses parts of previous implementation and keep a similar approach. The kernel heap allocators are using a sequential freelist making their allocation predictable. WebbCONFIG_SLAB_FREELIST_RANDOM - Kernel-Config - BoxMatrix. If you like BoxMatrix then please contribute Supportdata, Supportdata2, Firmware and/or Hardware ( get in touch ). …
Webb25 apr. 2016 · SLAB freelist. The list is randomized during initialization of a new set of pages. The order on different freelist sizes is pre-computed at boot for performance. … WebbThe list is randomized during initialization of a new set >>> of pages. The order on different freelist sizes is pre-computed at boot >>> for performance. Each kmem_cache has its own randomized freelist except >>> early on boot where global lists are used.
Webb23 feb. 2024 · Enabling ARCH_HAS_ELF_RANDOMIZE, which will make repeat exploits much more difficult by randomizing certain memory locations. While these will add CPU overhead to some degree: Enabling DEBUG_VIRTUAL will enable some sanity checking in virt_to_page translation at the cost of CPU cycles. Webb15 feb. 2024 · 既存のスラブアロケータ実装であるSLAB、SLUBではfree list randomizationという機構を導入し、ヒープオーバーフローを防いでいます。 free list …
Webb21 aug. 2016 · This article discusses freelist randomization options that I added recently in the Linux kernel (v4.8). The option is available for the SLUB (default) and SLAB kernel heaps. This feature can be enabled using CONFIG_SLAB_FREELIST_RANDOM, it is disabled by default. The commits on Linus’ tree upstream: SLAB Freelist randomization …
rollen redispatch 2.0Webb> + Randomizes the freelist order used on creating new SLABs. This > + security feature reduces the predictability of the kernel slab > + allocator against heap overflows. Against … rollen und featuresWebb25 apr. 2016 · The list is randomized during initialization of a new set > of pages. The order on different freelist sizes is pre-computed at boot > for performance. Each kmem_cache … rollena walker obituary atlanta gaWebb11 aug. 2024 · SLAB_FREELIST_HARDENED obfuscates the freelist pointers for slab, making it hard for attackers to hijack the allocation. Although the security guarantee of freelist hardening provided in the upstream kernel was weaker for some time, exploitation that wants to overwrite freelist pointers requires some knowledge about the runtime … rollenbiografie tempelritter aus nathanWebbMake sense. I think it is still valuable to randomize earlier pages. I will adapt the code, test and send patch v4. Thanks for the quick feedback, Thomas On Mon, Apr 25, 2016 at 5:40 PM, Joonsoo Kim wrote: > On Mon, Apr 25, 2016 at 01:39:23PM -0700, Thomas Garnier wrote: >> Provides an optional config … rollenbiografie nathanWebb25 apr. 2016 · The list is randomized during initialization of a new set of pages. The order on different freelist sizes is pre-computed at boot for performance. Each kmem_cache … rollenbiografie recha nathan weiseWebb25 maj 2016 · It was > previous implemented for the SLAB allocator. Both use the same > configuration option (CONFIG_SLAB_FREELIST_RANDOM). > > The list is randomized during initialization of a new set of pages. The > order on different freelist sizes is pre-computed at boot for > performance. Each kmem_cache has its own randomized freelist. rollenbiographie barblin andorra