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a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1718888913; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=0rJovHGmssGPw0RKMhyX09OgLWhw/Ce/UFsR3Y5KGD4=; b=Jc+vu0x9mzR2O9rn9v9FzoXKwuH30ek9Az09Yd26XR24I/ncOmB4mgkStrHmsPgD0Dz8Ox o3efBBYF7y/SqHDQ== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id C50251369F; Thu, 20 Jun 2024 13:08:32 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 5k+/L9ApdGbNQwAAD6G6ig (envelope-from ); Thu, 20 Jun 2024 13:08:32 +0000 Message-ID: <7f122473-3d36-401d-8df4-02d981949f00@suse.cz> Date: Thu, 20 Jun 2024 15:08:32 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 2/6] mm/slab: Plumb kmem_buckets into __do_kmalloc_node() Content-Language: en-US To: Kees Cook Cc: "GONG, Ruiqi" , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , jvoisin , Andrew Morton , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Xiu Jianfeng , Suren Baghdasaryan , Kent Overstreet , Jann Horn , Matteo Rizzo , Thomas Graf , Herbert Xu , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-hardening@vger.kernel.org, netdev@vger.kernel.org References: <20240619192131.do.115-kees@kernel.org> <20240619193357.1333772-2-kees@kernel.org> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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Since this will provide > a mitigation for a very common case of exploits, enable it by default. No longer "enable it by default". > > To be able to choose which buckets to allocate from, make the buckets > available to the internal kmalloc interfaces by adding them as the > first argument, rather than depending on the buckets being chosen from second argument now > the fixed set of global buckets. Where the bucket is not available, > pass NULL, which means "use the default system kmalloc bucket set" > (the prior existing behavior), as implemented in kmalloc_slab(). > > To avoid adding the extra argument when !CONFIG_SLAB_BUCKETS, only the > top-level macros and static inlines use the buckets argument (where > they are stripped out and compiled out respectively). The actual extern > functions can then been built without the argument, and the internals > fall back to the global kmalloc buckets unconditionally. Also describes the previous implementation and not the new one? > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -273,6 +273,22 @@ config SLAB_FREELIST_HARDENED > sacrifices to harden the kernel slab allocator against common > freelist exploit methods. > > +config SLAB_BUCKETS > + bool "Support allocation from separate kmalloc buckets" > + depends on !SLUB_TINY > + help > + Kernel heap attacks frequently depend on being able to create > + specifically-sized allocations with user-controlled contents > + that will be allocated into the same kmalloc bucket as a > + target object. To avoid sharing these allocation buckets, > + provide an explicitly separated set of buckets to be used for > + user-controlled allocations. This may very slightly increase > + memory fragmentation, though in practice it's only a handful > + of extra pages since the bulk of user-controlled allocations > + are relatively long-lived. > + > + If unsure, say Y. I was wondering why I don't see the buckets in slabinfo and turns out it was SLAB_MERGE_DEFAULT. It would probably make sense for SLAB_MERGE_DEFAULT to depends on !SLAB_BUCKETS now as the merging defeats the purpose, wdyt?