Slab freelist randomization
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. 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 …
Slab freelist randomization
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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- … 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 …
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 … WebbSL*B freelist randomization was submitted by Thomas Garnier. For more detail, plz read his write-up. SLAB freelist randomization merged in v4.7 and SLUB freelist randomization merged in v4.8. PaX/Grsecurity added …
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. > 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 …
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 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 …
WebbTo: 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 … fun warm places to liveWebb3 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 fun warm up drills for netballWebb19 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 … github identityserver duendesoftwareWebb12 mars 2024 · 然后在每次申请新的slab 的时候，会调用 shuffle_freelist 函数，根据 random_seq 来把 freelist 链表的顺序打乱，这样内存申请的object 后，下一个可以申请 … fun warm up questions for adultsWebb20 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 … fun warm places to travelWebb25 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. fun warm up games year 1Webb18 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. fun warm up drills for kids baseball