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Slab freelist randomization

WebbCONFIG_SLAB_FREELIST_RANDOM - SLAB freelist randomization - BoxMatrix FRITZ!Box Research Wiki. If you like BoxMatrix then please contribute Supportdata, Supportdata2, Firmware and/or Hardware (get in touch). My [email protected] is not reachable by me since september. 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.

kernel-hardening - Re: [RFC v2 2/2] mm: SLUB 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 Webbinteresting in 1994, but not with contemporary CPUs. So all the slab allocator does today is just adding an unnecessary layer of complexity over the page allocator. Thus, with this patch, all three slab allocators are removed, and only a layer that passes everything to the page allocator remains in the slab.h and mm/slab_common.c files. scripting tips for shifting realities https://combustiondesignsinc.com

スラブアロケータのfree list randomizationの実装について - Qiita

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 … WebbOn Tue, 26 Apr 2016 09:21:10 -0700 Thomas Garnier wrote: > Provides an optional config (CONFIG_FREELIST_RANDOM) to randomize the > 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. WebbSigned-off-by: GONG, Ruiqi --- v0: The current implementation only randomize slab caches for KMALLOC_NORMAL allocation. Besides the patch itself, we would also like to know the opinion of the community about whether or not it's necessary to extend this randomization to all KMALLOC_*, and if so, if implementing a three- … scripting therapy

CONFIG_SLAB_FREELIST_RANDOM - Kernel-Config - BoxMatrix

Category:CONFIG_SHUFFLE_PAGE_ALLOCATOR: Page allocator randomization …

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Slab freelist randomization

Re: [PATCH v2] mm: SLAB freelist randomization

Webb5 apr. 2024 · to create multiple copies of generic slab caches that will never be merged, and random one of them will be used at allocation. 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 WebbCONFIG_SLAB_FREELIST_RANDOM - freelist order randomized during initialization of a new slab (new set of pages for that region) 83 85 93. Linux 4.11. …

Slab freelist randomization

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Webb18 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 … Webb25 apr. 2016 · mm: SLAB freelist randomization Provides an optional config (CONFIG_FREELIST_RANDOM) to randomize the SLAB freelist. The list is randomized …

Webb26 aug. 2015 · • July 2016 (v4.7) –Slab freelist randomization added • October 2016 (v4.8) –weakened form of PAX_USERCOPY and GCC plugin support added • Plugin support added by Emese Revfy as part of CII funding • December 2016 (v4.9) –VMAP_STACK merged • Weakened form of GRKERNSEC_KSTACKOVERFLOW, caused DoS or device malfunction … Webb> + Randomizes the freelist order used on creating new SLABs. This > + security feature reduces the predictability of the kernel slab > + allocator against heap overflows. Against …

Webb20 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. This … Webb30 nov. 2024 · Another slab cache can be used to flush the randomized quarantine, so eventually the vulnerable object returns into the allocator freelist in its cache, and …

Webballocations to compliment SLAB_FREELIST_RANDOM, but the default granularity of shuffling on the "MAX_ORDER - 1" i.e, 10th order of pages is selected based on cache utilization benefits on x86. While the randomization improves cache utilization it may negatively impact workloads on platforms without a cache. For

Webb11 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 … scripting the life you wantWebb25 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. scripting tips robloxWebbCONFIG_SLAB_FREELIST_RANDOM - Kernel-Config - BoxMatrix. If you like BoxMatrix then please contribute Supportdata, Supportdata2, Firmware and/or Hardware ( get in touch ). … scripting tmuxWebbThe 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. scripting tips for shiftingWebbSome slab implementations have more+ sanity-checking than others. This option is most effective with+ CONFIG_SLUB.++config SHUFFLE_PAGE_ALLOCATOR+ bool "Page … scripting tipsWebb6 apr. 2016 · mm: SLAB freelist randomization Provide an optional config (CONFIG_FREELIST_RANDOM) to randomize the SLAB freelist. This security feature … paytm legal headscripting today