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AJvYcCWA8THvhBZOnuIZISRYxgTgz8ZFX3kXkpI6n2D/Es/H8+6iKNqM5hQkhFfxP8MRJzxNtq9egycM7cjk+9zApOgXLQHTjonQNYJoeGUx X-Gm-Message-State: AOJu0YyCjJBOVlPL8VeeAlcf00LqKNi+Tj8ahh0Fi/2poGdESFcbhd2p sG8PtYcjN2eyoQzdf6mqIrnHCmezGFSr3SNLuZ4/3yd2jDI3jYbcqRo47tu3gixUA4/BXGyAewW WkQ== X-Google-Smtp-Source: AGHT+IFDzjF2cGPjf9byIT/iUDxPrFM8RUYETPrPWdKRGwVNA8HPcuChMwLVorzqu+gtL/yYLkx2m1ZVYB4= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:201:b848:2b3f:be49:9cbc]) (user=surenb job=sendgmr) by 2002:a05:690c:fd0:b0:602:cd1a:6708 with SMTP id dg16-20020a05690c0fd000b00602cd1a6708mr1449899ywb.0.1707773989875; Mon, 12 Feb 2024 13:39:49 -0800 (PST) Date: Mon, 12 Feb 2024 13:38:54 -0800 In-Reply-To: <20240212213922.783301-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240212213922.783301-1-surenb@google.com> X-Mailer: git-send-email 2.43.0.687.g38aa6559b0-goog Message-ID: <20240212213922.783301-9-surenb@google.com> Subject: [PATCH v3 08/35] 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, 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 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Kees Cook --- 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 436a126486b5..f4ff635091e4 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -589,6 +589,12 @@ prepare_slab_obj_exts_hook(struct kmem_cache *s, gfp_t= flags, void *p) if (!need_slab_obj_ext()) return NULL; =20 + if (s->flags & SLAB_NO_OBJ_EXT) + return NULL; + + if (flags & __GFP_NO_OBJ_EXT) + return NULL; + slab =3D 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 6bfa1810da5e..83fec2dd2e2d 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -218,6 +218,8 @@ int alloc_slab_obj_exts(struct slab *slab, struct kmem_= cache *s, void *vec; =20 gfp &=3D ~OBJCGS_CLEAR_MASK; + /* Prevent recursive extension vector allocation */ + gfp |=3D __GFP_NO_OBJ_EXT; vec =3D kcalloc_node(objects, sizeof(struct slabobj_ext), gfp, slab_nid(slab)); if (!vec) --=20 2.43.0.687.g38aa6559b0-goog