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From: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
To: "shakeelb@google.com" <shakeelb@google.com>
Cc: "kernel-hardening@lists.openwall.com" 
	<kernel-hardening@lists.openwall.com>,
	"luto@kernel.org" <luto@kernel.org>,
	"Hansen, Dave" <dave.hansen@intel.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"peterz@infradead.org" <peterz@infradead.org>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"rppt@kernel.org" <rppt@kernel.org>,
	"linux-hardening@vger.kernel.org"
	<linux-hardening@vger.kernel.org>,
	"Weiny, Ira" <ira.weiny@intel.com>,
	"Williams, Dan J" <dan.j.williams@intel.com>
Subject: Re: [PATCH RFC 5/9] x86, mm: Use cache of page tables
Date: Fri, 7 May 2021 16:27:27 +0000	[thread overview]
Message-ID: <588d4b82a6cb47383e73e5d375b2b1766b4d3511.camel@intel.com> (raw)
In-Reply-To: <CALvZod7ieLEObX0y-7X+_zMwaVN5o0P-ZwZVLqCAK5ytQrNs9w@mail.gmail.com>

On Thu, 2021-05-06 at 11:24 -0700, Shakeel Butt wrote:
> On Tue, May 4, 2021 at 5:36 PM Rick Edgecombe
> <rick.p.edgecombe@intel.com> wrote:
> > 
> [...]
> > +#ifdef CONFIG_PKS_PG_TABLES
> > +struct page *alloc_table(gfp_t gfp)
> > +{
> > +       struct page *table;
> > +
> > +       if (!pks_page_en)
> > +               return alloc_page(gfp);
> > +
> > +       table = get_grouped_page(numa_node_id(), &gpc_pks);
> > +       if (!table)
> > +               return NULL;
> > +
> > +       if (gfp & __GFP_ZERO)
> > +               memset(page_address(table), 0, PAGE_SIZE);
> > +
> > +       if (memcg_kmem_enabled() &&
> > +           gfp & __GFP_ACCOUNT &&
> > +           !__memcg_kmem_charge_page(table, gfp, 0)) {
> > +               free_table(table);
> > +               table = NULL;
> > +       }
> > +
> > +       VM_BUG_ON_PAGE(*(unsigned long *)&table->ptl, table);
> 
> table can be NULL due to charge failure.

Argh, yes. Thank you. I'll remove the VM_BUG_ON, it was left
accidentally.

  reply	other threads:[~2021-05-07 16:27 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-05  0:30 [PATCH RFC 0/9] PKS write protected " Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 1/9] list: Support getting most recent element in list_lru Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 2/9] list: Support list head not in object for list_lru Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 3/9] x86/mm/cpa: Add grouped page allocations Rick Edgecombe
2021-05-05 12:08   ` Mike Rapoport
2021-05-05 13:09     ` Peter Zijlstra
2021-05-05 18:45       ` Mike Rapoport
2021-05-05 21:57         ` Edgecombe, Rick P
2021-05-09  9:39           ` Mike Rapoport
2021-05-10 19:38             ` Edgecombe, Rick P
2021-05-05  0:30 ` [PATCH RFC 4/9] mm: Explicitly zero page table lock ptr Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 5/9] x86, mm: Use cache of page tables Rick Edgecombe
2021-05-05  8:51   ` Peter Zijlstra
2021-05-05 12:09     ` Mike Rapoport
2021-05-05 13:19       ` Peter Zijlstra
2021-05-05 21:54         ` Edgecombe, Rick P
2021-05-06 17:59       ` Matthew Wilcox
2021-05-06 18:24   ` Shakeel Butt
2021-05-07 16:27     ` Edgecombe, Rick P [this message]
2021-05-05  0:30 ` [PATCH RFC 6/9] x86/mm/cpa: Add set_memory_pks() Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 7/9] x86/mm/cpa: Add perm callbacks to grouped pages Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 8/9] x86, mm: Protect page tables with PKS Rick Edgecombe
2021-05-05  0:30 ` [PATCH RFC 9/9] x86, cpa: PKS protect direct map page tables Rick Edgecombe
2021-05-05  2:03 ` [PATCH RFC 0/9] PKS write protected " Ira Weiny
2021-05-05  6:25 ` Kees Cook
2021-05-05  8:37   ` Peter Zijlstra
2021-05-05 18:38     ` Kees Cook
2021-05-05 19:51   ` Edgecombe, Rick P
2021-05-06  0:00   ` Ira Weiny
2021-05-05 11:08 ` Vlastimil Babka
2021-05-05 11:56   ` Peter Zijlstra
2021-05-05 19:46     ` Edgecombe, Rick P

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