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From: Kees Cook <keescook@chromium.org>
To: Russell King - ARM Linux <linux@armlinux.org.uk>
Cc: LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Christian Borntraeger <borntraeger@de.ibm.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
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Alexander Viro <viro@zeniv.linux.org.uk>,
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"David S. Miller" <davem@davemloft.net>,
Laura Abbott <labbott@redhat.com>,
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kernel-hardening@lists.openwall.com
Subject: Re: [PATCH 34/38] arm: Implement thread_struct whitelist for hardened usercopy
Date: Thu, 11 Jan 2018 15:21:09 -0800 [thread overview]
Message-ID: <CAGXu5jKaz_rAi_R2x3V73306fw+1MOBN-6v-nK4_S=PU8_pzhA@mail.gmail.com> (raw)
In-Reply-To: <20180111102400.GT17719@n2100.armlinux.org.uk>
On Thu, Jan 11, 2018 at 2:24 AM, Russell King - ARM Linux
<linux@armlinux.org.uk> wrote:
> On Wed, Jan 10, 2018 at 06:03:06PM -0800, Kees Cook wrote:
>> ARM does not carry FPU state in the thread structure, so it can declare
>> no usercopy whitelist at all.
>
> This comment seems to be misleading. We have stored FP state in the
> thread structure for a long time - for example, VFP state is stored
> in thread->vfpstate.hard, so we _do_ have floating point state in
> the thread structure.
>
> What I think this commit message needs to describe is why we don't
> need a whitelist _despite_ having FP state in the thread structure.
>
> At the moment, the commit message is making me think that this patch
> is wrong and will introduce a regression.
Yeah, I will improve this comment; it's not clear enough. The places
where I see state copied to/from userspace are all either static sizes
or already use bounce buffers (or both). e.g.:
err |= __copy_from_user(&hwstate->fpregs, &ufp->fpregs,
sizeof(hwstate->fpregs));
I will adjust the commit log and comment to more clearly describe the
lack of whitelisting due to all-static sized copies.
Thanks!
-Kees
--
Kees Cook
Pixel Security
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next prev parent reply other threads:[~2018-01-11 23:21 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-11 2:02 [PATCH v5 00/38] Hardened usercopy whitelisting Kees Cook
2018-01-11 2:02 ` [PATCH 01/38] usercopy: Remove pointer from overflow report Kees Cook
2018-01-11 2:02 ` [PATCH 02/38] usercopy: Enhance and rename report_usercopy() Kees Cook
2018-01-11 17:06 ` Christopher Lameter
2018-01-14 20:57 ` Kees Cook
2018-01-11 2:02 ` [PATCH 03/38] usercopy: Include offset in hardened usercopy report Kees Cook
2018-01-11 2:02 ` [PATCH 04/38] lkdtm/usercopy: Adjust test to include an offset to check reporting Kees Cook
2018-01-11 2:02 ` [PATCH 05/38] stddef.h: Introduce sizeof_field() Kees Cook
2018-01-11 2:02 ` [PATCH 06/38] usercopy: Prepare for usercopy whitelisting Kees Cook
2018-01-11 2:02 ` [PATCH 07/38] usercopy: WARN() on slab cache usercopy region violations Kees Cook
2018-01-11 2:02 ` [PATCH 08/38] usercopy: Allow strict enforcement of whitelists Kees Cook
2018-01-11 2:02 ` [PATCH 09/38] usercopy: Mark kmalloc caches as usercopy caches Kees Cook
2019-11-12 7:17 ` [kernel-hardening] " Jiri Slaby
2019-11-12 21:21 ` Kees Cook
2019-11-14 21:27 ` Kees Cook
2020-01-23 8:14 ` Jiri Slaby
2020-01-27 23:19 ` Kees Cook
2020-01-28 7:58 ` Christian Borntraeger
2020-01-28 23:01 ` Kees Cook
2020-01-29 9:26 ` Ursula Braun
2020-01-29 16:43 ` Christopher Lameter
2020-01-29 17:07 ` Christian Borntraeger
2020-01-29 17:09 ` Christoph Hellwig
2020-01-29 17:19 ` Christian Borntraeger
2020-01-30 19:23 ` Kees Cook
2020-01-31 12:03 ` Jann Horn
2020-02-01 17:56 ` Kees Cook
2020-02-01 19:27 ` Jann Horn
2020-02-03 7:46 ` Matthew Wilcox
2020-02-03 17:41 ` Christoph Hellwig
2020-02-03 17:20 ` Christopher Lameter
2020-04-07 8:00 ` Vlastimil Babka
2020-04-07 11:05 ` Christian Borntraeger
2020-04-20 7:53 ` Jiri Slaby
2020-04-20 17:43 ` Kees Cook
2020-02-03 17:38 ` Christoph Hellwig
2020-02-03 17:36 ` Christoph Hellwig
2018-01-11 2:02 ` [PATCH 10/38] dcache: Define usercopy region in dentry_cache slab cache Kees Cook
2018-01-11 2:02 ` [PATCH 11/38] vfs: Define usercopy region in names_cache slab caches Kees Cook
2018-01-11 2:02 ` [PATCH 12/38] vfs: Copy struct mount.mnt_id to userspace using put_user() Kees Cook
2018-01-11 2:02 ` [PATCH 13/38] ext4: Define usercopy region in ext4_inode_cache slab cache Kees Cook
2018-01-11 17:01 ` Theodore Ts'o
2018-01-11 23:05 ` Kees Cook
2018-01-11 23:05 ` Kees Cook
2018-01-14 22:34 ` Matthew Wilcox
2018-01-11 2:02 ` [PATCH 14/38] ext2: Define usercopy region in ext2_inode_cache " Kees Cook
2018-01-11 2:02 ` [PATCH 15/38] jfs: Define usercopy region in jfs_ip " Kees Cook
2018-01-11 2:02 ` [PATCH 16/38] befs: Define usercopy region in befs_inode_cache " Kees Cook
2018-01-11 2:02 ` [PATCH 17/38] exofs: Define usercopy region in exofs_inode_cache " Kees Cook
2018-01-11 2:02 ` [PATCH 18/38] orangefs: Define usercopy region in orangefs_inode_cache " Kees Cook
2018-01-11 2:02 ` [PATCH 19/38] ufs: Define usercopy region in ufs_inode_cache " Kees Cook
2018-01-11 2:02 ` [PATCH 20/38] vxfs: Define usercopy region in vxfs_inode " Kees Cook
2018-01-11 2:02 ` [PATCH 21/38] cifs: Define usercopy region in cifs_request " Kees Cook
2018-01-11 2:02 ` [PATCH 22/38] scsi: Define usercopy region in scsi_sense_cache " Kees Cook
2018-01-11 2:02 ` [PATCH 23/38] net: Define usercopy region in struct proto " Kees Cook
2018-01-11 2:02 ` [PATCH 24/38] ip: Define usercopy region in IP " Kees Cook
2018-01-11 2:02 ` [PATCH 25/38] caif: Define usercopy region in caif " Kees Cook
2018-01-11 2:02 ` [PATCH 26/38] sctp: Define usercopy region in SCTP " Kees Cook
2018-01-11 2:02 ` [PATCH 27/38] sctp: Copy struct sctp_sock.autoclose to userspace using put_user() Kees Cook
2018-01-18 21:31 ` Laura Abbott
2018-01-18 21:36 ` Kees Cook
2018-01-11 2:03 ` [PATCH 28/38] net: Restrict unwhitelisted proto caches to size 0 Kees Cook
2018-01-11 2:03 ` [PATCH 29/38] fork: Define usercopy region in mm_struct slab caches Kees Cook
2018-01-11 2:03 ` [PATCH 30/38] fork: Define usercopy region in thread_stack " Kees Cook
2018-01-11 2:03 ` [PATCH 31/38] fork: Provide usercopy whitelisting for task_struct Kees Cook
2018-01-11 2:03 ` [PATCH 32/38] x86: Implement thread_struct whitelist for hardened usercopy Kees Cook
2018-01-11 2:03 ` [PATCH 33/38] arm64: " Kees Cook
2018-01-15 12:24 ` Dave P Martin
2018-01-15 20:06 ` Kees Cook
2018-01-16 12:33 ` Dave Martin
2018-01-11 2:03 ` [PATCH 34/38] arm: " Kees Cook
2018-01-11 10:24 ` Russell King - ARM Linux
2018-01-11 23:21 ` Kees Cook [this message]
2018-01-11 2:03 ` [PATCH 35/38] kvm: whitelist struct kvm_vcpu_arch Kees Cook
2018-01-11 2:03 ` [PATCH 36/38] kvm: x86: fix KVM_XEN_HVM_CONFIG ioctl Kees Cook
2018-01-11 2:03 ` [PATCH 37/38] usercopy: Restrict non-usercopy caches to size 0 Kees Cook
2018-01-11 2:03 ` [PATCH 38/38] lkdtm: Update usercopy tests for whitelisting Kees Cook
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