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Matthew Wilcox (Oracle) 9ddb3c14af mm: fix struct page layout on 32-bit systems 
32-bit architectures which expect 8-byte alignment for 8-byte integers and
need 64-bit DMA addresses (arm, mips, ppc) had their struct page
inadvertently expanded in 2019.  When the dma_addr_t was added, it forced
the alignment of the union to 8 bytes, which inserted a 4 byte gap between
'flags' and the union.

Fix this by storing the dma_addr_t in one or two adjacent unsigned longs.
This restores the alignment to that of an unsigned long.  We always
store the low bits in the first word to prevent the PageTail bit from
being inadvertently set on a big endian platform.  If that happened,
get_user_pages_fast() racing against a page which was freed and
reallocated to the page_pool could dereference a bogus compound_head(),
which would be hard to trace back to this cause.

Link: https://lkml.kernel.org/r/20210510153211.1504886-1-willy@infradead.org
Fixes: c25fff7171 ("mm: add dma_addr_t to struct page")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Matteo Croce <mcroce@linux.microsoft.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2021-05-14 19:41:32 -07:00
..
6lowpan 6lowpan: Fix some typos in nhc_udp.c 2021-03-24 17:52:11 -07:00
9p net: 9p: Correct function names in the kerneldoc comments 2021-03-28 17:56:56 -07:00
802
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8021q Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-26 12:00:00 -07:00
appletalk appletalk: Fix skb allocation size in loopback case 2021-02-12 16:40:28 -08:00
atm net: atm: pppoatm: use new API for wakeup tasklet 2021-01-29 18:24:05 -08:00
ax25 net/ax25: Delete obsolete TODO file 2021-03-30 16:54:50 -07:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-09 20:48:35 -07:00
bluetooth Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
bpf bpf: selftests: Add kfunc_call test 2021-03-26 20:41:52 -07:00
bpfilter net: remove redundant 'depends on NET' 2021-01-27 17:04:12 -08:00
bridge bridge: Fix possible races between assigning rx_handler_data and setting IFF_BRIDGE_PORT bit 2021-04-29 15:33:17 -07:00
caif net: caif: Use netif_rx_any_context(). 2021-02-15 13:21:48 -08:00
can can: proc: fix rcvlist_* header alignment on 64-bit system 2021-04-25 19:43:00 +02:00
ceph Notable items here are a series to take advantage of David Howells' 2021-05-06 10:27:02 -07:00
core mm: fix struct page layout on 32-bit systems 2021-05-14 19:41:32 -07:00
dcb net: dcb: use obj-$(CONFIG_DCB) form in net/Makefile 2021-01-27 17:03:52 -08:00
dccp net: dccp: use net_generic storage 2021-04-09 16:34:56 -07:00
decnet net/decnet: Delete obsolete TODO file 2021-03-30 16:54:50 -07:00
dns_resolver net: remove redundant 'depends on NET' 2021-01-27 17:04:12 -08:00
dsa net: selftest: fix build issue if INET is disabled 2021-04-28 14:06:45 -07:00
ethernet of: net: pass the dst buffer to of_get_mac_address() 2021-04-13 14:35:02 -07:00
ethtool ethtool: fix missing NLM_F_MULTI flag when dumping 2021-05-05 12:41:10 -07:00
hsr net: hsr: check skb can contain struct hsr_ethhdr in fill_frame_info 2021-05-03 13:33:54 -07:00
ieee802154 net: remove the new_ifindex argument from dev_change_net_namespace 2021-04-07 14:43:28 -07:00
ife net: remove redundant 'depends on NET' 2021-01-27 17:04:12 -08:00
ipv4 Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2021-05-07 16:10:12 -07:00
ipv6 net: Remove redundant assignment to err 2021-04-29 15:34:15 -07:00
iucv iucv: af_iucv.c: Couple of typo fixes 2021-03-28 17:31:13 -07:00
kcm kcm: kcmsock.c: Couple of typo fixes 2021-03-28 17:31:13 -07:00
key af_key: relax availability checks for skb size calculation 2021-01-04 10:05:50 +01:00
l2tp net: fix a concurrency bug in l2tp_tunnel_register() 2021-04-27 14:23:13 -07:00
l3mdev l3mdev: Correct function names in the kerneldoc comments 2021-03-28 17:56:55 -07:00
lapb net: lapb: Make "lapb_t1timer_running" able to detect an already running timer 2021-03-23 14:14:50 -07:00
llc llc2: Remove redundant assignment to rc 2021-04-27 14:16:14 -07:00
mac80211 Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
mac802154 net: mac802154: Fix general protection fault 2021-04-06 22:42:16 +02:00
mpls mpls: Remove redundant assignment to err 2021-04-27 14:17:00 -07:00
mptcp mptcp: fix splat when closing unaccepted socket 2021-05-07 15:53:40 -07:00
ncsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-09 20:48:35 -07:00
netfilter netfilter: nftables: avoid potential overflows on 32bit arches 2021-05-07 10:01:39 +02:00
netlabel Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
netlink netlink: don't call ->netlink_bind with table lock held 2021-04-16 17:01:04 -07:00
netrom net: netrom: nr_in: Remove redundant assignment to ns 2021-04-28 13:59:08 -07:00
nfc net/nfc: fix use-after-free llcp_sock_bind/connect 2021-05-04 11:59:48 -07:00
nsh
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openvswitch openvswitch: fix stack OOB read while fragmenting IPv4 packets 2021-04-29 15:31:53 -07:00
packet net/packet: remove data races in fanout operations 2021-04-14 14:34:38 -07:00
phonet
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psample psample: Add additional metadata attributes 2021-03-14 15:00:43 -07:00
qrtr Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-04-26 12:00:00 -07:00
rds RDMA merge window pull request 2021-05-01 09:15:05 -07:00
rfkill Another set of updates, all over the map: 2021-04-20 16:44:04 -07:00
rose net: rose: Fix fall-through warnings for Clang 2021-03-10 12:45:15 -08:00
rxrpc Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
sched net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets 2021-04-29 15:31:53 -07:00
sctp sctp: delay auto_asconf init until binding the first addr 2021-05-03 13:36:21 -07:00
smc smc: disallow TCP_ULP in smc_setsockopt() 2021-05-05 12:52:45 -07:00
strparser
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sunrpc NFS client updates for Linux 5.13 2021-05-07 11:23:41 -07:00
switchdev net: bridge: propagate extack through switchdev_port_attr_set 2021-02-14 17:38:11 -08:00
tipc Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
tls net/tls: Remove redundant initialization of record 2021-04-27 14:15:19 -07:00
unix af_unix: handle idmapped mounts 2021-01-24 14:27:18 +01:00
vmw_vsock vsock/vmci: Remove redundant assignment to err 2021-04-30 15:00:59 -07:00
wireless Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
x25 af_x25.c: Fix a spello 2021-03-28 17:31:13 -07:00
xdp xsk: Fix for xp_aligned_validate_desc() when len == chunk_size 2021-05-04 00:28:06 +02:00
xfrm xfrm: ipcomp: remove unnecessary get_cpu() 2021-04-19 12:49:29 +02:00
Kconfig net: selftest: fix build issue if INET is disabled 2021-04-28 14:06:45 -07:00
Makefile net: l3mdev: use obj-$(CONFIG_NET_L3_MASTER_DEV) form in net/Makefile 2021-01-27 17:03:52 -08:00
compat.c
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devres.c
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socket.c net: Fix a misspell in socket.c 2021-03-25 16:56:27 -07:00
sysctl_net.c net: Ensure net namespace isolation of sysctls 2021-04-12 13:27:11 -07:00