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From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Christopher Lameter <cl@linux.com>,
Kees Cook <keescook@chromium.org>, Jiri Slaby <jslaby@suse.cz>,
Julian Wiedmann <jwi@linux.ibm.com>,
Ursula Braun <ubraun@linux.ibm.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-kernel@vger.kernel.org, David Windsor <dave@nullcore.net>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-xfs@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Laura Abbott <labbott@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Christoffer Dall <christoffer.dall@linaro.org>,
Dave Kleikamp <dave.kleikamp@oracle.com>, Jan Kara <jack@suse.cz>,
Luis de Bethencourt <luisbg@kernel.org>,
Marc Zyngier <marc.zyngier@arm.com>,
Rik van Riel <riel@redhat.com>,
Matthew Garrett <mjg59@google.com>,
linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org,
netdev@vger.kernel.org, kernel-hardening@lists.openwall.com,
Vlastimil Babka <vbabka@suse.cz>,
Michal Kubecek <mkubecek@suse.cz>
Subject: Re: [kernel-hardening] [PATCH 09/38] usercopy: Mark kmalloc caches as usercopy caches
Date: Wed, 29 Jan 2020 18:19:56 +0100 [thread overview]
Message-ID: <771c5511-c5ab-3dd1-d938-5dbc40396daa@de.ibm.com> (raw)
In-Reply-To: <20200129170939.GA4277@infradead.org>
On 29.01.20 18:09, Christoph Hellwig wrote:
> On Wed, Jan 29, 2020 at 06:07:14PM +0100, Christian Borntraeger wrote:
>>> DMA can be done to NORMAL memory as well.
>>
>> Exactly.
>> I think iucv uses GFP_DMA because z/VM needs those buffers to reside below 2GB (which is ZONA_DMA for s390).
>
> The normal way to allocate memory with addressing limits would be to
> use dma_alloc_coherent and friends. Any chance to switch iucv over to
> that? Or is there no device associated with it?
There is not necessarily a device for that. It is a hypervisor interface (an
instruction that is interpreted by z/VM). We do have the netiucv driver that
creates a virtual nic, but there is also AF_IUCV which works without a device.
But back to the original question: If we mark kmalloc caches as usercopy caches,
we should do the same for DMA kmalloc caches. As outlined by Christoph, this has
nothing to do with device DMA.
next prev parent reply other threads:[~2020-01-29 17:20 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 [this message]
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
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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