From: "H. Peter Anvin" <hpa@zytor.com>
To: Dave Young <dyoung@redhat.com>
Cc: Matt Fleming <matt@console-pimps.org>,
linux-efi@vger.kernel.org, mjg59@srcf.ucam.org,
Greg KH <greg@kroah.com>,
x86@kernel.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org,
James.Bottomley@HansenPartnership.com, horms@verge.net.au,
bp@alien8.de, ebiederm@xmission.com, vgoyal@redhat.com
Subject: Re: [patch 0/7 v2] kexec kernel efi runtime support
Date: Sun, 10 Nov 2013 18:21:09 -0800 [thread overview]
Message-ID: <52803F15.3080204@zytor.com> (raw)
In-Reply-To: <20131111021356.GC4407@dhcp-16-126.nay.redhat.com>
On 11/10/2013 06:13 PM, Dave Young wrote:
>
> Huang Ying <ying.huang@intel.com> created the debugfs file for boot_params.
> His first version patch tried sysfs, but sysfs is not designed for such
> binary blobs so finally it go to debugfs.
>
That is a misunderstanding. Binary blobs can exist in sysfs as long as
the blob is something that is inherently a blob. This is admittedly a
corner case, but it is without any doubt a protocol-defined binary
structure.
The reason it was put in debugfs is that there was no non-debug user for
it at the time.
> Any idea for this is welcome, till now I have no better idea for such kind
> of data. We should have another *fs instead of using debugfs.
The problem with debugfs is that things go into debugfs with largely no
auditing. As a result, mounting debugfs is very likely to mean that
your system is exploitable one way or another.
-hpa
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next prev parent reply other threads:[~2013-11-11 2:22 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-05 8:20 [patch 0/7 v2] kexec kernel efi runtime support dyoung
2013-11-05 8:20 ` [patch 1/7 v2] Add function efi_remap_region for remapping to saved virt address dyoung
2013-11-13 15:50 ` Matt Fleming
2013-11-14 1:38 ` Dave Young
2013-11-15 23:02 ` Toshi Kani
2013-11-18 2:09 ` Dave Young
2013-11-18 9:37 ` Dave Young
2013-11-05 8:20 ` [patch 2/7 v2] x86 efi: reserve boot service fix dyoung
2013-11-15 23:10 ` Toshi Kani
2013-11-05 8:20 ` [patch 3/7 v2] Cleanup efi_enter_virtual_mode function dyoung
2013-11-13 15:50 ` Matt Fleming
2013-11-14 1:39 ` Dave Young
2013-11-15 23:21 ` Toshi Kani
2013-11-18 2:08 ` Dave Young
2013-11-05 8:20 ` [patch 4/7 v2] export more efi table variable to sysfs dyoung
2013-11-12 0:40 ` Greg KH
2013-11-12 8:19 ` Dave Young
2013-11-12 8:24 ` Dave Young
2013-11-12 8:31 ` Greg KH
2013-11-05 8:20 ` [patch 5/7 v2] export efi runtime memory mapping " dyoung
2013-11-13 15:50 ` Matt Fleming
2013-11-14 1:50 ` Dave Young
2013-11-18 2:16 ` Dave Young
2013-11-19 12:18 ` Matt Fleming
2013-11-05 8:20 ` [patch 6/7 v2] passing kexec necessary efi data via setup_data dyoung
2013-11-13 15:50 ` Matt Fleming
2013-11-14 1:52 ` Dave Young
2013-11-05 8:20 ` [patch 7/7 v2] x86: add xloadflags bit for efi runtime support on kexec dyoung
2013-11-13 15:50 ` Matt Fleming
2013-11-14 1:53 ` Dave Young
2013-11-13 16:20 ` H. Peter Anvin
2013-11-14 1:36 ` Dave Young
2013-11-05 14:40 ` [patch 0/7 v2] kexec kernel efi runtime support Borislav Petkov
2013-11-08 14:31 ` Matt Fleming
2013-11-09 3:57 ` Dave Young
2013-11-09 5:01 ` H. Peter Anvin
2013-11-11 2:13 ` Dave Young
2013-11-11 2:21 ` H. Peter Anvin [this message]
2013-11-11 2:47 ` Dave Young
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