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Fri, 18 Oct 2024 09:51:49 +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 qTMCKrUvEmdHYgAAD6G6ig (envelope-from ); Fri, 18 Oct 2024 09:51:49 +0000 Message-ID: Date: Fri, 18 Oct 2024 11:51:49 +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 v3 0/3] mm/slub: Improve data handling of krealloc() when orig_size is enabled Content-Language: en-US To: Feng Tang , Andrew Morton , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Andrey Konovalov , Marco Elver , Alexander Potapenko , Dmitry Vyukov , Danilo Krummrich , Narasimhan.V@amd.com Cc: linux-mm@kvack.org, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org References: <20241016154152.1376492-1-feng.tang@intel.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Score: -2.80 X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; FREEMAIL_TO(0.00)[intel.com,linux-foundation.org,linux.com,kernel.org,google.com,lge.com,linux.dev,gmail.com,amd.com]; TAGGED_RCPT(0.00)[]; MIME_TRACE(0.00)[0:+]; RCPT_COUNT_TWELVE(0.00)[17]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.cz:mid] X-Spam-Flag: NO X-Spam-Level: On 10/16/24 17:41, Feng Tang wrote: > Danilo Krummrich's patch [1] raised one problem about krealloc() that > its caller doesn't pass the old request size, say the object is 64 > bytes kmalloc one, but caller originally only requested 48 bytes. Then > when krealloc() shrinks or grows in the same object, or allocate a new > bigger object, it lacks this 'original size' information to do accurate > data preserving or zeroing (when __GFP_ZERO is set). > > Thus with slub debug redzone and object tracking enabled, parts of the > object after krealloc() might contain redzone data instead of zeroes, > which is violating the __GFP_ZERO guarantees. Good thing is in this > case, kmalloc caches do have this 'orig_size' feature, which could be > used to improve the situation here. > > To make the 'orig_size' accurate, we adjust some kasan/slub meta data > handling. Also add a slub kunit test case for krealloc(). > > Many thanks to syzbot and V, Narasimhan for detecting issues of the > v2 patches. > > This is again linux-slab tree's 'for-6.13/fixes' branch Thanks, added there. Vlastimil > [1]. https://lore.kernel.org/lkml/20240812223707.32049-1-dakr@kernel.org/ > > Thanks, > Feng > > Changelog: > > Since v2: > * Fix NULL pointer issue related to big kmalloc object which has > no associated slab (V, Narasimhan, syzbot) > * Fix issue related handling for kfence allocated object (syzbot, > Marco Elver) > * drop the 0001 and 0003 patch whch have been merged to slab tree > > Since v1: > * Drop the patch changing generic kunit code from this patchset, > and will send it separately. > * Separate the krealloc moving form slab_common.c to slub.c to a > new patch for better review (Danilo/Vlastimil) > * Improve commit log and comments (Vlastimil/Danilo) > * Rework the kunit test case to remove its dependency over > slub_debug (which is incomplete in v1) (Vlastimil) > * Add ack and review tag from developers. > > > > Feng Tang (3): > mm/slub: Consider kfence case for get_orig_size() > mm/slub: Improve redzone check and zeroing for krealloc() > mm/slub, kunit: Add testcase for krealloc redzone and zeroing > > lib/slub_kunit.c | 42 +++++++++++++++++++++++ > mm/slub.c | 87 +++++++++++++++++++++++++++++++++++------------- > 2 files changed, 105 insertions(+), 24 deletions(-) >