linux-kernel - [PATCH v2 10/39] mm: prevent slabobj_ext allocations for slabobj_ext and kmem

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20231024134637.3120277-11-surenb@google.com>
Date:   Tue, 24 Oct 2023 06:46:07 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     akpm@...ux-foundation.org
Cc:     kent.overstreet@...ux.dev, mhocko@...e.com, vbabka@...e.cz,
        hannes@...xchg.org, roman.gushchin@...ux.dev, mgorman@...e.de,
        dave@...olabs.net, willy@...radead.org, liam.howlett@...cle.com,
        corbet@....net, void@...ifault.com, peterz@...radead.org,
        juri.lelli@...hat.com, ldufour@...ux.ibm.com,
        catalin.marinas@....com, will@...nel.org, arnd@...db.de,
        tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
        x86@...nel.org, peterx@...hat.com, david@...hat.com,
        axboe@...nel.dk, mcgrof@...nel.org, masahiroy@...nel.org,
        nathan@...nel.org, dennis@...nel.org, tj@...nel.org,
        muchun.song@...ux.dev, rppt@...nel.org, paulmck@...nel.org,
        pasha.tatashin@...een.com, yosryahmed@...gle.com,
        yuzhao@...gle.com, dhowells@...hat.com, hughd@...gle.com,
        andreyknvl@...il.com, keescook@...omium.org,
        ndesaulniers@...gle.com, vvvvvv@...gle.com,
        gregkh@...uxfoundation.org, ebiggers@...gle.com, ytcoode@...il.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, bristot@...hat.com,
        vschneid@...hat.com, cl@...ux.com, penberg@...nel.org,
        iamjoonsoo.kim@....com, 42.hyeyoo@...il.com, glider@...gle.com,
        elver@...gle.com, dvyukov@...gle.com, shakeelb@...gle.com,
        songmuchun@...edance.com, jbaron@...mai.com, rientjes@...gle.com,
        minchan@...gle.com, kaleshsingh@...gle.com, surenb@...gle.com,
        kernel-team@...roid.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
        linux-arch@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-modules@...r.kernel.org,
        kasan-dev@...glegroups.com, cgroups@...r.kernel.org
Subject: [PATCH v2 10/39] mm: prevent slabobj_ext allocations for slabobj_ext
 and kmem_cache objects

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 <surenb@...gle.com>
---
 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)
-- 
2.42.0.758.gaed0368e0e-goog