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Tue, 4 Jun 2024 12:30:32 +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 OocIBegIX2auaAAAD6G6ig (envelope-from ); Tue, 04 Jun 2024 12:30:32 +0000 Message-ID: <801d4833-6a29-4134-8ed6-5006d157af88@suse.cz> Date: Tue, 4 Jun 2024 14:30:31 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 2/6] mm/slab: Plumb kmem_buckets into __do_kmalloc_node() Content-Language: en-US To: Kees Cook Cc: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , jvoisin , Andrew Morton , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org, linux-hardening@vger.kernel.org, "GONG, Ruiqi" , Xiu Jianfeng , Suren Baghdasaryan , Kent Overstreet , Jann Horn , Matteo Rizzo , Thomas Graf , Herbert Xu , linux-kernel@vger.kernel.org, netdev@vger.kernel.org References: <20240531191304.it.853-kees@kernel.org> <20240531191458.987345-2-kees@kernel.org> <8c0c4af3-4782-4dbc-b413-e2f3b79c0246@suse.cz> <202406031539.3A465006@keescook> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Flag: NO X-Spam-Score: -3.00 X-Rspamd-Action: no action X-Rspamd-Queue-Id: 40CA521A2D X-Spam-Level: X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.00 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; XM_UA_NO_VERSION(0.01)[]; MX_GOOD(-0.01)[]; MIME_TRACE(0.00)[0:+]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FUZZY_BLOCKED(0.00)[rspamd.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCPT_COUNT_TWELVE(0.00)[21]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; ARC_NA(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; FREEMAIL_CC(0.00)[linux.com,kernel.org,google.com,lge.com,dustri.org,linux-foundation.org,linux.dev,gmail.com,kvack.org,vger.kernel.org,huaweicloud.com,huawei.com,suug.ch,gondor.apana.org.au]; RCVD_COUNT_TWO(0.00)[2]; MID_RHS_MATCH_FROM(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_VIA_SMTP_AUTH(0.00)[]; TAGGED_RCPT(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.cz:+]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns] On 6/4/24 12:44 AM, Kees Cook wrote: > On Mon, Jun 03, 2024 at 07:06:15PM +0200, Vlastimil Babka wrote: >> On 5/31/24 9:14 PM, Kees Cook wrote: >> > Introduce CONFIG_SLAB_BUCKETS which provides the infrastructure to >> > support separated kmalloc buckets (in the follow kmem_buckets_create() >> > patches and future codetag-based separation). Since this will provide >> > a mitigation for a very common case of exploits, enable it by default. >> >> Are you sure? I thought there was a policy that nobody is special enough >> to have stuff enabled by default. Is it worth risking Linus shouting? :) > > I think it's important to have this enabled given how common the > exploitation methodology is and how cheap this solution is. Regardless, > if you want it "default n", I can change it. Yeah, I'd just recommend it in the help, noting it has a bit of memory overhead. Defaults are not that important anyway IMHO, either it's distro doing the config, and individually security conscious people should know what they are doing. > > This looks really nice, thank you! This is well aligned with the codetag > followup, which also needs to have "size" be very easy to find (to the > macros can check for compile-time-constant or not). > > I will go work from your branch... Great! > Thanks! > > -Kees >