From: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
To: "akpm@linux-foundation.org" <akpm@linux-foundation.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"daniel@iogearbox.net" <daniel@iogearbox.net>,
"jeyu@kernel.org" <jeyu@kernel.org>,
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"ast@kernel.org" <ast@kernel.org>,
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"linux-mm@kvack.org" <linux-mm@kvack.org>,
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"Dock, Deneen T" <deneen.t.dock@intel.com>,
"kristen@linux.intel.com" <kristen@linux.intel.com>,
"will.deacon@arm.com" <will.deacon@arm.com>,
"mingo@redhat.com" <mingo@redhat.com>,
"luto@kernel.org" <luto@kernel.org>,
"Keshavamurthy, Anil S" <anil.s.keshavamurthy@intel.com>,
"kernel-hardening@lists.openwall.com"
<kernel-hardening@lists.openwall.com>,
"mhiramat@kernel.org" <mhiramat@kernel.org>,
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<naveen.n.rao@linux.vnet.ibm.com>,
"davem@davemloft.net" <davem@davemloft.net>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"Hansen, Dave" <dave.hansen@intel.com>
Subject: Re: [PATCH 2/2] x86/modules: Make x86 allocs to flush when free
Date: Thu, 29 Nov 2018 00:02:15 +0000 [thread overview]
Message-ID: <c4d6ce8af83ab9f92e76f36bce7ffa5574f7104b.camel@intel.com> (raw)
In-Reply-To: <20181128151145.78a3d8b1f66f6b8fd66f0629@linux-foundation.org>
On Wed, 2018-11-28 at 15:11 -0800, Andrew Morton wrote:
> On Tue, 27 Nov 2018 16:07:54 -0800 Rick Edgecombe <rick.p.edgecombe@intel.com>
> wrote:
>
> > Change the module allocations to flush before freeing the pages.
> >
> > ...
> >
> > --- a/arch/x86/kernel/module.c
> > +++ b/arch/x86/kernel/module.c
> > @@ -87,8 +87,8 @@ void *module_alloc(unsigned long size)
> > p = __vmalloc_node_range(size, MODULE_ALIGN,
> > MODULES_VADDR + get_module_load_offset(),
> > MODULES_END, GFP_KERNEL,
> > - PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
> > - __builtin_return_address(0));
> > + PAGE_KERNEL_EXEC, VM_IMMEDIATE_UNMAP,
> > + NUMA_NO_NODE, __builtin_return_address(0));
> > if (p && (kasan_module_alloc(p, size) < 0)) {
> > vfree(p);
> > return NULL;
>
> Should any other architectures do this?
I would think everything that has something like an NX bit and doesn't use the
default module_alloc implementation.
I could add the flag for every arch that defines PAGE_KERNEL_EXEC, but I don't
have a good way to test on all of those architectures.
Thanks,
Rick
next prev parent reply other threads:[~2018-11-29 0:02 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-28 0:07 [PATCH 0/2] Don’t leave executable TLB entries to freed pages Rick Edgecombe
2018-11-28 0:07 ` [PATCH 1/2] vmalloc: New flag for flush before releasing pages Rick Edgecombe
2018-12-04 0:04 ` Edgecombe, Rick P
2018-12-04 1:43 ` Nadav Amit
2018-12-04 16:03 ` Will Deacon
2018-12-04 20:02 ` Edgecombe, Rick P
2018-12-04 20:09 ` Andy Lutomirski
2018-12-04 23:52 ` Edgecombe, Rick P
2018-12-05 1:57 ` Andy Lutomirski
2018-12-05 11:41 ` Will Deacon
2018-12-05 23:16 ` Andy Lutomirski
2018-12-06 7:29 ` Ard Biesheuvel
2018-12-06 11:10 ` Will Deacon
2018-12-06 18:53 ` Andy Lutomirski
2018-12-06 19:01 ` Tycho Andersen
2018-12-06 19:19 ` Andy Lutomirski
2018-12-06 19:39 ` Nadav Amit
2018-12-06 20:17 ` Andy Lutomirski
2018-12-06 23:08 ` Nadav Amit
2018-12-07 3:06 ` Edgecombe, Rick P
2018-12-06 20:19 ` Edgecombe, Rick P
2018-12-06 20:26 ` Andy Lutomirski
2018-12-06 19:04 ` Ard Biesheuvel
2018-12-06 19:20 ` Andy Lutomirski
2018-12-06 19:23 ` Ard Biesheuvel
2018-12-06 19:31 ` Will Deacon
2018-12-06 19:36 ` Ard Biesheuvel
2018-12-04 20:36 ` Nadav Amit
[not found] ` <e70c618d10ddbb834b7a3bbdd6e2bebed0f8719d.camel@intel.com>
2018-12-05 0:01 ` Nadav Amit
2018-12-05 0:29 ` Edgecombe, Rick P
2018-12-05 0:53 ` Nadav Amit
2018-12-05 1:45 ` Edgecombe, Rick P
2018-12-05 2:09 ` Nadav Amit
2018-12-04 18:56 ` Andy Lutomirski
2018-12-04 19:44 ` Nadav Amit
2018-12-04 19:48 ` Andy Lutomirski
2018-12-04 22:48 ` Nadav Amit
2018-12-04 23:27 ` Andy Lutomirski
2018-12-04 23:34 ` Nadav Amit
2018-12-05 1:09 ` Edgecombe, Rick P
2018-12-05 1:45 ` Nadav Amit
2018-11-28 0:07 ` [PATCH 2/2] x86/modules: Make x86 allocs to flush when free Rick Edgecombe
2018-11-28 23:11 ` Andrew Morton
2018-11-29 0:02 ` Edgecombe, Rick P [this message]
2018-11-29 1:40 ` Andy Lutomirski
2018-11-29 6:14 ` Edgecombe, Rick P
2018-11-28 1:06 ` [PATCH 0/2] Don’t leave executable TLB entries to freed pages Nadav Amit
2018-11-28 1:21 ` Nadav Amit
2018-11-28 9:57 ` Will Deacon
2018-11-28 18:29 ` Nadav Amit
2018-11-29 14:06 ` Masami Hiramatsu
2018-11-29 18:49 ` Edgecombe, Rick P
2018-11-29 23:19 ` Masami Hiramatsu
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