site stats

Slab freelist randomization

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 … WebbImplements Freelist randomization for the SLUB allocator. 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.

grsecurity - How AUTOSLAB Changes the Memory Unsafety Game

Webb9 feb. 2024 · SLAB_FREELIST_RANDOM - Enables or disables the randomization of the kernel's heap, potentially making it easier to exploit kernel heap overflows. [Security recommendation: SLAB_FREELIST_RANDOM=y] SLAB_FREELIST_HARDENED - Protects the kernel slab's metadata, potentially making it harder to execute various slab / heap … Webb25 apr. 2016 · mm: SLAB freelist randomization Provides an optional config (CONFIG_FREELIST_RANDOM) to randomize the SLAB freelist. The list is randomized … pipe joiner https://mellittler.com

Linux-Kernel Archive: Re: [RFC v1] mm: SLAB freelist randomization

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. … 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. 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 of what needed changing). > > > This security feature reduces the predictability of > > the kernel slab allocator against heap overflows. > pipe jointing machine

kernel-hardening - [RFC v1 2/2] mm: SLUB Freelist randomization

Category:[PATCH] Fix SLAB freelist randomization duplicate entries

Tags:Slab freelist randomization

Slab freelist randomization

[kernel-hardening] [RFC v2 0/2] mm: SLUB Freelist randomization

Webb10 mars 2024 · slub 是针对内核的小内存分配，和用户态堆一开始会brk分一大块内存，然后再慢慢切割一样. 伙伴系统给内存，然后slub分配器把内存切割成特定大小的块，后续 … 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

Slab freelist randomization

Did you know?

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 … 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 …

Webb30 dec. 2024 · Страница-жертва (страница, с которой взят объект-жертва) обычно будет находиться в slab ЦП из этапа 4, но если на этапе 4 slab ЦП был заполнен полностью, страница-жертва тоже может быть новым, только что … 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

Webb在slab中，struct kmem_cache是管理每种缓存的数据结构。. linux为了实现kmem_cache的实例也由slab管理，对kmem_cache进行了巧妙的初始化，而不是简单的静态声明kmem_cache缓存。. 我们先来看一下slub缓存 … WebbCONFIG_SLAB_FREELIST_RANDOM - Kernel-Config - BoxMatrix. If you like BoxMatrix then please contribute Supportdata, Supportdata2, Firmware and/or Hardware ( get in touch ). …

WebbLKML Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH] mm: SLAB freelist randomization @ 2016-04-15 17:25 Thomas Garnier 2016-04-15 22:00 ` Andrew Morton 0 siblings, 1 reply; 8+ messages in thread From: Thomas Garnier @ 2016-04-15 17:25 UTC (permalink / raw) To: Christoph Lameter, Pekka Enberg, David Rientjes, …

Webb19 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 security … pipe joint sealantWebbCONFIG_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. atk 700 dirt bikeWebb20 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 … pipe joining machineWebb15 apr. 2016 · mm: SLAB freelist randomization Provide 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. pipe joint leak repairWebb18 nov. 2024 · SLAB freelist randomization – 随机化创建新页面时使用的空闲列表顺序。 此安全功能降低了内核slab分配器对堆溢出的可预测性。 Harden slab freelist metadata … atk acpi utilityWebb20 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 security feature reduces the predictability of the > >> kernel SLAB allocator against heap overflows rendering attacks much less > >> stable. > > > > I'm not familiar on security but it doesn't … atk 853aWebbTo: Thomas Garnier ; Subject: Re: [RFC v1] mm: SLAB freelist randomization; From: Kees Cook ; Date: Wed, 6 Apr 2016 14:45:30 -0700; Cc: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim … atk 70185