2024 Randomize slab freelist

Randomize slab freelist

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Webb16 dec. 2024 · These four types of random sampling techniques will allow you to do just that. 1. Simple Random Sampling. Simple random sampling requires the use of randomly generated numbers to choose a sample. More specifically, it initially requires a sampling … WebbMake 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 …

[PATCH] mm: SLAB freelist randomization

WebbIn addition to using reciprocal_scale rather than %, use the initialize-while-shuffling form of Fisher-Yates. Rather than swapping list[i] and list[rand] immediately after initializing list[i] = i, copy list[i] = list[rand] and then initialize list[rand] = i. WebbSymbol: CONFIG_SLAB_FREELIST_RANDOM Help: Randomizes the freelist order used on creating new pages. This security feature reduces the predictability of the kernel slab allocator against heap overflows. Type: boolean Choice: excluded [ ] Reason: You can safely exclude this option as it's related to CONFIG_SLAB. the village claremont restaurants

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Webbslab_test 1 run on boot. Difference only seen on the 2048 size test being the worse case scenario covered by freelist randomization. New slab pages are constantly being created on the 10000 allocations. Variance should be mainly due to getting new pages every few … Webb30 nov. 2024 · The heap quarantine PUT operation you see in this output happens during kernel memory freeing. The heap quarantine REDUCE operation happens during kernel memory allocation, if the quarantine size limit is exceeded. The kernel objects released … WebbMessage ID: [email protected] (mailing list archive)State: New: Headers: show the village cinema meridian idaho showtimes

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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, … Webb21 dec. 2024 · This speculative execution can +then be used to read data in memory and cause side effects, such as displacing +data in a data cache. The side effect can then later be measured by the +malicious software, and used to determine the memory values read speculatively. + +Spectre attacks allow tricking other software to disclose +values in … the village clarksburg mdWebb29 juni 2024 · Checks the hardening options in the Linux kernel config. optional arguments: -h, –help show this help message and exit. –version show program’s version number and exit. -p {X86_64,X86_32,ARM64,ARM}, –print {X86_64,X86_32,ARM64,ARM} print hardening preferences for selected architecture. the village classified

"WebbIn slab subsystem, If we use __GFP_DIRECT_RECLAIM, it will cause to enable interrupt when allocating new slab page. GFP_NOWAIT is to prevent that situation. Anyway, I audit the code and kmem_cache_init_late() could use __GFP_DIRECT_RECLAIM because it is … " - Randomize slab freelist

Randomize slab freelist

Linux-Kernel Archive: Re: [PATCH v2] mm: SLAB freelist …

WebbThis option is most effective with - CONFIG_SLUB. - -config SHUFFLE_PAGE_ALLOCATOR - bool "Page allocator randomization" - default SLAB_FREELIST_RANDOM && ACPI_NUMA - help - Randomization of the page allocator improves the average - utilization of a direct-mapped memory-side-cache. WebbWhen a high random number is used, the freelist will contain duplicate entries. It will result in different allocations sharing the same chunk. It will result in odd behaviours and crashes. It should be uncommon but it depends on the machines. We saw it happening more …

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Webb7 feb. 2024 · Setting CONFIG_SLAB causes the kernel to not use the traditional default SLUB allocator (which preserves the freelist linked list metadata on the kernel heap); instead it uses the older SLAB allocator … WebbThis commit reorganizes the previous SLAB freelist randomization to prepare for the SLUB implementation. It moves functions that will be shared to slab_common. It also move the definition of freelist_idx_t in the slab_def header so a similar type can be used for all …

Webb19 aug. 2024 · - Randomizes the freelist order used on creating new pages. This - security feature reduces the predictability of the kernel slab - allocator against heap overflows. - -config SLAB_FREELIST_HARDENED - bool "Harden slab freelist metadata" - depends on … Webbmerging at runtime, "slab_nomerge" can be passed on the kernel: command line. config SLAB_FREELIST_RANDOM: bool "Randomize slab freelist" depends on SLAB (SLUB && !SLUB_TINY) help: Randomizes the freelist order used on creating new pages. This: security feature reduces the predictability of the kernel slab: allocator against heap …

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. This security feature reduces the predictability of the kernel SLAB allocator against heap overflows rendering attacks … Webb15 feb. 2024 · ここでは、SLABのfree list randomizationについて書いていきます。SLUBの実装ではSLAB側で定義した関数が呼ばれていたりするので、まずはこっちからっていう感じですね。 mm: SLAB freelist randomization では、ここのgit差分をもとに見ていきま …

WebbWe list mitigations added in all Linux versions. kernel.randomize_va_space. Address Space Layout Randomization (ASLR). virtual syscalls (vsyscall) replaced by virtual Dynamic Shared Object (vDSO) (ineffective until 2024) kernel.mmap_min_addr. NULL page …

Webb25 apr. 2016 · 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. Each kmem_cache … the village clinic bishops cleeveWebb10 mars 2024 · slab 其实就类似一个fastbin, 所有的分配都会在 kmem_cache_cpu 结构体的 freelist 上找。. 刚开始什么都没有，伙伴系统会根据 kmem_cache 的配置信息给出一块内存，分配好后类似 freelist … the village claremontWebb13 feb. 2024 · Hi, While running disksnoop.py on own built 4.16-rc1+ (the base distro is fedora 27), I got this error, tried to add debug=6 to debug, but it doesn't seem to point out where opcode 00 comes from, a... the village cliffsWebb2 apr. 2024 · To summarize the. > advantages: >. > - Less code to maintain: over 13k lines are removed by this patch, and. > more could be removed if I wast^Wspent more time on this, and later as. > users are transitioned from the legacy layer. This no longer needs a. … the village classesWebb18 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 – 许多内核堆攻击试图针对slab缓存元数据和其他基础设施。 the village clinicWebbslab_test 1 run on boot. Difference only seen on the 2048 size test being the worse case scenario covered by freelist randomization. New slab pages are constantly being created on the 10000 allocations. Variance should be mainly due to getting new pages every few … the village clinic blackthornWebb10 maj 2024 · To: Andrew Morton ; Subject: [PATCH v2 2/6] mm: Kconfig: move swap and slab config options to the MM section; From: Johannes Weiner ; Date: Tue, 10 May 2024 11:28:43 -0400; Cc: Michal Hocko , Roman Gushchin , Shakeel Butt … the village cliffs dallas