From patchwork Tue Oct 24 13:46:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suren Baghdasaryan X-Patchwork-Id: 13434546 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EBC8C2B744 for ; Tue, 24 Oct 2023 13:47:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ogBFPLi8" Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E97D310F5 for ; Tue, 24 Oct 2023 06:47:04 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-d9cb4de3bf0so5405248276.0 for ; Tue, 24 Oct 2023 06:47:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1698155224; x=1698760024; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=YHgfLVMScT5H/FxRnxJh+3xP9v/l17ghYQJMJklbWxc=; b=ogBFPLi8fvrnXU6vKCvucgyBHD5/3evNz0uRdyIFs1oqcaBX8qH5RZIeDsGH5V53QY JLd7XMnbQQW4W6PcPFwunDg79vf1GF+pP0ZszfguoLxlNiM6dNl9bhmgYu9aYHXqe5MG y16phkyjP8bmXcYvLbVM7YJLoOIG6SS4BfVuqAGapmdfBrGOrgcKjgu7u44cD8cOm9kE qpUSR4ZpYt1oFZNTpSldByfENNAof0Yda8pAhuvtUGtgQiJ0Lwc5DkLRBOPLUEGZpma7 qyjusp0eIOv43YbpV2B02o5Bmw7aBZdYPAM0vGYC3iHwM7a+tawV6Rat4RnOz5U+04yt JClQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698155224; x=1698760024; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=YHgfLVMScT5H/FxRnxJh+3xP9v/l17ghYQJMJklbWxc=; b=uyx2t63eDrk32ppxriPgJP6v2/KoDwkMXpDKmOOmJhjObFPWlbxbucccxHPBiuSLU4 dSEuZqqASgcqd4c8s5ia9Nxar9wu5j7nxd2d4QwhbefLfynLw+o+IWeBYgK4hrzqf5Cc ovEfDLDlyIQdApSXpEVARuneiib5r9UqhAgjHhoaIirVuFRPybbzIq4SASDdqLrgoVFD IvDlxiVF0zslS+R/v9697MB3x9x6ITmiRXc/UXsMjyaunZd/b4RnVXgXgc3rz5ZTDmHB YYjcO/eUonnjb0rk31mVKCKIo5QDSdZzrkvERVlVj4ZkMmEdqXe5CdeZfCzZJMOD/zXd vCdw== X-Gm-Message-State: AOJu0Yz1fdLLkZ2WESfA+SzVJ7hGvTWkPzYGDKrjkqajz8g5MN1o0kfI zsPFzFRuQKToGQbooFmwlesxHx5+J74= X-Google-Smtp-Source: AGHT+IHeBKvEZxCc8z4s40S7ha5hgPZX8U0NGngnhsFR9kbksVyPLDfdSNwpUqF/X+vAqjdciG/7nvEnCYM= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:201:45ba:3318:d7a5:336a]) (user=surenb job=sendgmr) by 2002:a25:297:0:b0:d9a:4c45:cfd0 with SMTP id 145-20020a250297000000b00d9a4c45cfd0mr213074ybc.2.1698155223878; Tue, 24 Oct 2023 06:47:03 -0700 (PDT) Date: Tue, 24 Oct 2023 06:46:07 -0700 In-Reply-To: <20231024134637.3120277-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20231024134637.3120277-1-surenb@google.com> X-Mailer: git-send-email 2.42.0.758.gaed0368e0e-goog Message-ID: <20231024134637.3120277-11-surenb@google.com> Subject: [PATCH v2 10/39] mm: prevent slabobj_ext allocations for slabobj_ext and kmem_cache objects From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: kent.overstreet@linux.dev, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, corbet@lwn.net, void@manifault.com, peterz@infradead.org, juri.lelli@redhat.com, ldufour@linux.ibm.com, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, peterx@redhat.com, david@redhat.com, axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, dennis@kernel.org, tj@kernel.org, muchun.song@linux.dev, rppt@kernel.org, paulmck@kernel.org, pasha.tatashin@soleen.com, yosryahmed@google.com, yuzhao@google.com, dhowells@redhat.com, hughd@google.com, andreyknvl@gmail.com, keescook@chromium.org, ndesaulniers@google.com, vvvvvv@google.com, gregkh@linuxfoundation.org, ebiggers@google.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, cl@linux.com, penberg@kernel.org, iamjoonsoo.kim@lge.com, 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, shakeelb@google.com, songmuchun@bytedance.com, jbaron@akamai.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, surenb@google.com, kernel-team@android.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, kasan-dev@googlegroups.com, cgroups@vger.kernel.org Use __GFP_NO_OBJ_EXT to prevent recursions when allocating slabobj_ext objects. Also prevent slabobj_ext allocations for kmem_cache objects. Signed-off-by: Suren Baghdasaryan --- mm/slab.h | 6 ++++++ mm/slab_common.c | 2 ++ 2 files changed, 8 insertions(+) diff --git a/mm/slab.h b/mm/slab.h index 5a47125469f1..187acc593397 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -489,6 +489,12 @@ prepare_slab_obj_exts_hook(struct kmem_cache *s, gfp_t flags, void *p) if (!need_slab_obj_ext()) return NULL; + if (s->flags & SLAB_NO_OBJ_EXT) + return NULL; + + if (flags & __GFP_NO_OBJ_EXT) + return NULL; + slab = virt_to_slab(p); if (!slab_obj_exts(slab) && WARN(alloc_slab_obj_exts(slab, s, flags, false), diff --git a/mm/slab_common.c b/mm/slab_common.c index 2b42a9d2c11c..446f406d2703 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -222,6 +222,8 @@ int alloc_slab_obj_exts(struct slab *slab, struct kmem_cache *s, void *vec; gfp &= ~OBJCGS_CLEAR_MASK; + /* Prevent recursive extension vector allocation */ + gfp |= __GFP_NO_OBJ_EXT; vec = kcalloc_node(objects, sizeof(struct slabobj_ext), gfp, slab_nid(slab)); if (!vec)