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Message-ID: <20230501165450.15352-12-surenb@google.com>
Date:   Mon,  1 May 2023 09:54:21 -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,
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        andreyknvl@...il.com, keescook@...omium.org,
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        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,
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        cgroups@...r.kernel.org
Subject: [PATCH 11/40] 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 25d14b3a7280..b1c22dc87047 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -450,6 +450,12 @@ 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 f11cc072b01e..42777d66d0e3 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -220,6 +220,8 @@ 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)
-- 
2.40.1.495.gc816e09b53d-goog

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