From: Kees Cook <keescook@chromium.org>
To: linux-kernel@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>,
David Windsor <dave@nullcore.net>,
"David S. Miller" <davem@davemloft.net>,
Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
netdev@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>,
Christoph Hellwig <hch@infradead.org>,
Christoph Lameter <cl@linux.com>,
Laura Abbott <labbott@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Christian Borntraeger <borntraeger@de.ibm.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,
linux-mm@kvack.org, kernel-hardening@lists.openwall.com
Subject: [kernel-hardening] [PATCH 21/36] ip: Define usercopy region in IP proto slab cache
Date: Tue, 9 Jan 2018 12:55:50 -0800 [thread overview]
Message-ID: <1515531365-37423-22-git-send-email-keescook@chromium.org> (raw)
In-Reply-To: <1515531365-37423-1-git-send-email-keescook@chromium.org>
From: David Windsor <dave@nullcore.net>
The ICMP filters for IPv4 and IPv6 raw sockets need to be copied to/from
userspace. In support of usercopy hardening, this patch defines a region
in the struct proto slab cache in which userspace copy operations are
allowed.
example usage trace:
net/ipv4/raw.c:
raw_seticmpfilter(...):
...
copy_from_user(&raw_sk(sk)->filter, ..., optlen)
raw_geticmpfilter(...):
...
copy_to_user(..., &raw_sk(sk)->filter, len)
net/ipv6/raw.c:
rawv6_seticmpfilter(...):
...
copy_from_user(&raw6_sk(sk)->filter, ..., optlen)
rawv6_geticmpfilter(...):
...
copy_to_user(..., &raw6_sk(sk)->filter, len)
This region is known as the slab cache's usercopy region. Slab caches
can now check that each dynamically sized copy operation involving
cache-managed memory falls entirely within the slab's usercopy region.
This patch is modified from Brad Spengler/PaX Team's PAX_USERCOPY
whitelisting code in the last public patch of grsecurity/PaX based on my
understanding of the code. Changes or omissions from the original code are
mine and don't reflect the original grsecurity/PaX code.
Signed-off-by: David Windsor <dave@nullcore.net>
[kees: split from network patch, provide usage trace]
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
net/ipv4/raw.c | 2 ++
net/ipv6/raw.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 33b70bfd1122..1b6fa4195ac9 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -970,6 +970,8 @@ struct proto raw_prot = {
.hash = raw_hash_sk,
.unhash = raw_unhash_sk,
.obj_size = sizeof(struct raw_sock),
+ .useroffset = offsetof(struct raw_sock, filter),
+ .usersize = sizeof_field(struct raw_sock, filter),
.h.raw_hash = &raw_v4_hashinfo,
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_raw_setsockopt,
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 761a473a07c5..08a85fabdfd1 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -1272,6 +1272,8 @@ struct proto rawv6_prot = {
.hash = raw_hash_sk,
.unhash = raw_unhash_sk,
.obj_size = sizeof(struct raw6_sock),
+ .useroffset = offsetof(struct raw6_sock, filter),
+ .usersize = sizeof_field(struct raw6_sock, filter),
.h.raw_hash = &raw_v6_hashinfo,
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_rawv6_setsockopt,
--
2.7.4
next prev parent reply other threads:[~2018-01-09 20:55 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-09 20:55 [kernel-hardening] [PATCH v4 00/36] Hardened usercopy whitelisting Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 01/36] usercopy: Remove pointer from overflow report Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 02/36] usercopy: Include offset in " Kees Cook
2018-01-10 15:25 ` [kernel-hardening] " Christopher Lameter
2018-01-10 21:15 ` Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 03/36] lkdtm/usercopy: Adjust test to include an offset to check reporting Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 04/36] usercopy: Prepare for usercopy whitelisting Kees Cook
2018-01-10 18:28 ` [kernel-hardening] " Christopher Lameter
2018-01-10 21:06 ` Kees Cook
2018-01-12 15:10 ` [kernel-hardening] " David Laight
2018-01-12 15:56 ` Christopher Lameter
2018-01-14 23:07 ` [kernel-hardening] " Matthew Wilcox
2018-01-16 15:21 ` [kernel-hardening] kmem_cache_attr (was Re: [PATCH 04/36] usercopy: Prepare for usercopy whitelisting) Christopher Lameter
2018-01-16 16:05 ` [kernel-hardening] " Matthew Wilcox
2018-01-16 16:54 ` Christopher Lameter
2018-01-16 17:43 ` Matthew Wilcox
2018-01-16 18:07 ` Christopher Lameter
2018-01-16 18:17 ` Christopher Lameter
2018-01-16 21:03 ` Matthew Wilcox
2018-01-17 14:46 ` Christopher Lameter
2018-01-17 17:42 ` Christopher Lameter
2018-01-17 19:31 ` Matthew Wilcox
2018-01-20 1:58 ` Christopher Lameter
2018-01-09 20:55 ` [kernel-hardening] [PATCH 05/36] usercopy: WARN() on slab cache usercopy region violations Kees Cook
2018-01-10 18:31 ` [kernel-hardening] " Christopher Lameter
2018-01-10 20:14 ` Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 06/36] usercopy: Mark kmalloc caches as usercopy caches Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 07/36] dcache: Define usercopy region in dentry_cache slab cache Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 08/36] vfs: Define usercopy region in names_cache slab caches Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 09/36] vfs: Copy struct mount.mnt_id to userspace using put_user() Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 10/36] ext4: Define usercopy region in ext4_inode_cache slab cache Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 11/36] ext2: Define usercopy region in ext2_inode_cache " Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 12/36] jfs: Define usercopy region in jfs_ip " Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 13/36] befs: Define usercopy region in befs_inode_cache " Kees Cook
2018-01-10 10:53 ` [kernel-hardening] " Luis de Bethencourt
2018-01-09 20:55 ` [kernel-hardening] [PATCH 14/36] exofs: Define usercopy region in exofs_inode_cache " Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 15/36] orangefs: Define usercopy region in orangefs_inode_cache " Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 16/36] ufs: Define usercopy region in ufs_inode_cache " Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 17/36] vxfs: Define usercopy region in vxfs_inode " Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 18/36] cifs: Define usercopy region in cifs_request " Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 19/36] scsi: Define usercopy region in scsi_sense_cache " Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 20/36] net: Define usercopy region in struct proto " Kees Cook
2018-01-09 20:55 ` Kees Cook [this message]
2018-01-09 20:55 ` [kernel-hardening] [PATCH 22/36] caif: Define usercopy region in caif " Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 23/36] sctp: Define usercopy region in SCTP " Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 24/36] sctp: Copy struct sctp_sock.autoclose to userspace using put_user() Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 25/36] net: Restrict unwhitelisted proto caches to size 0 Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 26/36] fork: Define usercopy region in mm_struct slab caches Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 27/36] fork: Define usercopy region in thread_stack " Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 28/36] fork: Provide usercopy whitelisting for task_struct Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 29/36] x86: Implement thread_struct whitelist for hardened usercopy Kees Cook
2018-01-09 20:55 ` [kernel-hardening] [PATCH 30/36] arm64: " Kees Cook
2018-01-09 20:56 ` [kernel-hardening] [PATCH 31/36] arm: " Kees Cook
2018-01-09 20:56 ` [kernel-hardening] [PATCH 32/36] kvm: whitelist struct kvm_vcpu_arch Kees Cook
2018-01-09 20:56 ` [kernel-hardening] [PATCH 33/36] kvm: x86: fix KVM_XEN_HVM_CONFIG ioctl Kees Cook
2018-01-09 20:56 ` [kernel-hardening] [PATCH 34/36] usercopy: Allow strict enforcement of whitelists Kees Cook
2018-01-09 20:56 ` [kernel-hardening] [PATCH 35/36] usercopy: Restrict non-usercopy caches to size 0 Kees Cook
2018-01-09 20:56 ` [kernel-hardening] [PATCH 36/36] lkdtm: Update usercopy tests for whitelisting Kees Cook
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