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Thu, 22 Feb 2024 20:48:12 -0800 (PST) Received: from google.com ([2401:fa00:8f:203:b194:4f71:568a:eeb0]) by smtp.gmail.com with ESMTPSA id z16-20020a62d110000000b006e38ea2e058sm11219684pfg.164.2024.02.22.20.48.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Feb 2024 20:48:12 -0800 (PST) Date: Fri, 23 Feb 2024 13:48:08 +0900 From: Sergey Senozhatsky To: Yosry Ahmed Cc: Tetsuo Handa , Johannes Weiner , Nhat Pham , Minchan Kim , Sergey Senozhatsky , linux-mm Subject: Re: [mm/page_alloc or mm/vmscan or mm/zswap] use-after-free in obj_malloc() Message-ID: <20240223044808.GK11472@google.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 5455A40005 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: w4849gpmuwhn8s39efmrzm8dk1411xbq X-HE-Tag: 1708663693-976947 X-HE-Meta: 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 hx/mB7Hz eYUtQ1bNkbBz3p3U7Sqb+hmx8iXEMVHEUyIsjb5/IGj09/Y6tSuxVoC4HmQVWvMQuUsAm/cS589oTfm0hjxu4+q1SAnS0KeSGIdlboe7roWZAMj7Vc94LfWrjRw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On (24/02/22 18:27), Yosry Ahmed wrote: > I also don't see any recent changes in mm/zsmalloc.c that modify this > code, so maybe it wasn't introduce in 6.7. I will defer to Minchan and > Sergey, I don't think zswap is an active actor in this bug report. Yeah. [1] are the only recent zsmalloc patches I can recall, and those patches touch zsmalloc locking (zspages migration/compaction). https://lore.kernel.org/lkml/20240219-b4-szmalloc-migrate-v1-0-34cd49c6545b@bytedance.com/