[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240212213922.783301-9-surenb@google.com>
Date: Mon, 12 Feb 2024 13:38:54 -0800
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, 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 v3 08/35] 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 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;
+ 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 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;
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)
--
2.43.0.687.g38aa6559b0-goog
Powered by blists - more mailing lists