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Alexey Kodanev 9c7f96fd77 netfilter: nf_tables: check msg_type before nft_trans_set(trans) 
The patch moves the "trans->msg_type == NFT_MSG_NEWSET" check before
using nft_trans_set(trans). Otherwise we can get out of bounds read.

For example, KASAN reported the one when running 0001_cache_handling_0 nft
test. In this case "trans->msg_type" was NFT_MSG_NEWTABLE:

[75517.177808] BUG: KASAN: slab-out-of-bounds in nft_set_lookup_global+0x22f/0x270 [nf_tables]
[75517.279094] Read of size 8 at addr ffff881bdb643fc8 by task nft/7356
...
[75517.375605] CPU: 26 PID: 7356 Comm: nft Tainted: G  E   4.17.0-rc7.1.x86_64 #1
[75517.489587] Hardware name: Oracle Corporation SUN SERVER X4-2
[75517.618129] Call Trace:
[75517.648821]  dump_stack+0xd1/0x13b
[75517.691040]  ? show_regs_print_info+0x5/0x5
[75517.742519]  ? kmsg_dump_rewind_nolock+0xf5/0xf5
[75517.799300]  ? lock_acquire+0x143/0x310
[75517.846738]  print_address_description+0x85/0x3a0
[75517.904547]  kasan_report+0x18d/0x4b0
[75517.949892]  ? nft_set_lookup_global+0x22f/0x270 [nf_tables]
[75518.019153]  ? nft_set_lookup_global+0x22f/0x270 [nf_tables]
[75518.088420]  ? nft_set_lookup_global+0x22f/0x270 [nf_tables]
[75518.157689]  nft_set_lookup_global+0x22f/0x270 [nf_tables]
[75518.224869]  nf_tables_newsetelem+0x1a5/0x5d0 [nf_tables]
[75518.291024]  ? nft_add_set_elem+0x2280/0x2280 [nf_tables]
[75518.357154]  ? nla_parse+0x1a5/0x300
[75518.401455]  ? kasan_kmalloc+0xa6/0xd0
[75518.447842]  nfnetlink_rcv+0xc43/0x1bdf [nfnetlink]
[75518.507743]  ? nfnetlink_rcv+0x7a5/0x1bdf [nfnetlink]
[75518.569745]  ? nfnl_err_reset+0x3c0/0x3c0 [nfnetlink]
[75518.631711]  ? lock_acquire+0x143/0x310
[75518.679133]  ? netlink_deliver_tap+0x9b/0x1070
[75518.733840]  ? kasan_unpoison_shadow+0x31/0x40
[75518.788542]  netlink_unicast+0x45d/0x680
[75518.837111]  ? __isolate_free_page+0x890/0x890
[75518.891913]  ? netlink_attachskb+0x6b0/0x6b0
[75518.944542]  netlink_sendmsg+0x6fa/0xd30
[75518.993107]  ? netlink_unicast+0x680/0x680
[75519.043758]  ? netlink_unicast+0x680/0x680
[75519.094402]  sock_sendmsg+0xd9/0x160
[75519.138810]  ___sys_sendmsg+0x64d/0x980
[75519.186234]  ? copy_msghdr_from_user+0x350/0x350
[75519.243118]  ? lock_downgrade+0x650/0x650
[75519.292738]  ? do_raw_spin_unlock+0x5d/0x250
[75519.345456]  ? _raw_spin_unlock+0x24/0x30
[75519.395065]  ? __handle_mm_fault+0xbde/0x3410
[75519.448830]  ? sock_setsockopt+0x3d2/0x1940
[75519.500516]  ? __lock_acquire.isra.25+0xdc/0x19d0
[75519.558448]  ? lock_downgrade+0x650/0x650
[75519.608057]  ? __audit_syscall_entry+0x317/0x720
[75519.664960]  ? __fget_light+0x58/0x250
[75519.711325]  ? __sys_sendmsg+0xde/0x170
[75519.758850]  __sys_sendmsg+0xde/0x170
[75519.804193]  ? __ia32_sys_shutdown+0x90/0x90
[75519.856725]  ? syscall_trace_enter+0x897/0x10e0
[75519.912354]  ? trace_event_raw_event_sys_enter+0x920/0x920
[75519.979432]  ? __audit_syscall_entry+0x720/0x720
[75520.036118]  do_syscall_64+0xa3/0x3d0
[75520.081248]  ? prepare_exit_to_usermode+0x47/0x1d0
[75520.139904]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[75520.201680] RIP: 0033:0x7fc153320ba0
[75520.245772] RSP: 002b:00007ffe294c3638 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[75520.337708] RAX: ffffffffffffffda RBX: 00007ffe294c4820 RCX: 00007fc153320ba0
[75520.424547] RDX: 0000000000000000 RSI: 00007ffe294c46b0 RDI: 0000000000000003
[75520.511386] RBP: 00007ffe294c47b0 R08: 0000000000000004 R09: 0000000002114090
[75520.598225] R10: 00007ffe294c30a0 R11: 0000000000000246 R12: 00007ffe294c3660
[75520.684961] R13: 0000000000000001 R14: 00007ffe294c3650 R15: 0000000000000001

[75520.790946] Allocated by task 7356:
[75520.833994]  kasan_kmalloc+0xa6/0xd0
[75520.878088]  __kmalloc+0x189/0x450
[75520.920107]  nft_trans_alloc_gfp+0x20/0x190 [nf_tables]
[75520.983961]  nf_tables_newtable+0xcd0/0x1bd0 [nf_tables]
[75521.048857]  nfnetlink_rcv+0xc43/0x1bdf [nfnetlink]
[75521.108655]  netlink_unicast+0x45d/0x680
[75521.157013]  netlink_sendmsg+0x6fa/0xd30
[75521.205271]  sock_sendmsg+0xd9/0x160
[75521.249365]  ___sys_sendmsg+0x64d/0x980
[75521.296686]  __sys_sendmsg+0xde/0x170
[75521.341822]  do_syscall_64+0xa3/0x3d0
[75521.386957]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

[75521.467867] Freed by task 23454:
[75521.507804]  __kasan_slab_free+0x132/0x180
[75521.558137]  kfree+0x14d/0x4d0
[75521.596005]  free_rt_sched_group+0x153/0x280
[75521.648410]  sched_autogroup_create_attach+0x19a/0x520
[75521.711330]  ksys_setsid+0x2ba/0x400
[75521.755529]  __ia32_sys_setsid+0xa/0x10
[75521.802850]  do_syscall_64+0xa3/0x3d0
[75521.848090]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

[75521.929000] The buggy address belongs to the object at ffff881bdb643f80
 which belongs to the cache kmalloc-96 of size 96
[75522.079797] The buggy address is located 72 bytes inside of
 96-byte region [ffff881bdb643f80, ffff881bdb643fe0)
[75522.221234] The buggy address belongs to the page:
[75522.280100] page:ffffea006f6d90c0 count:1 mapcount:0 mapping:0000000000000000 index:0x0
[75522.377443] flags: 0x2fffff80000100(slab)
[75522.426956] raw: 002fffff80000100 0000000000000000 0000000000000000 0000000180200020
[75522.521275] raw: ffffea006e6fafc0 0000000c0000000c ffff881bf180f400 0000000000000000
[75522.615601] page dumped because: kasan: bad access detected

Fixes: 37a9cc5255 ("netfilter: nf_tables: add generation mask to sets")
Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-06-01 10:14:51 +02:00
arch More arm64 fixes: 2018-05-25 09:35:11 -07:00
block blk-mq: fix sysfs inflight counter 2018-04-26 09:02:01 -06:00
certs certs/blacklist_nohashes.c: fix const confusion in certs blacklist 2018-02-21 15:35:43 -08:00
crypto crypto: drbg - set freed buffers to NULL 2018-04-21 00:57:00 +08:00
Documentation Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-05-25 19:54:42 -07:00
drivers ixgbe: fix parsing of TC actions for HW offload 2018-05-31 23:01:00 -04:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs proc: fix smaps and meminfo alignment 2018-05-25 18:12:11 -07:00
include Merge branch 'akpm' (patches from Andrew) 2018-05-25 20:24:28 -07:00
init init/main.c: include <linux/mem_encrypt.h> 2018-05-25 18:12:11 -07:00
ipc ipc/shm: fix shmat() nil address after round-down when remapping 2018-05-25 18:12:11 -07:00
kernel Merge branch 'akpm' (patches from Andrew) 2018-05-25 20:24:28 -07:00
lib idr: fix invalid ptr dereference on item delete 2018-05-25 18:12:10 -07:00
LICENSES LICENSES: Add MPL-1.1 license 2018-01-06 10:59:44 -07:00
mm kasan: fix memory hotplug during boot 2018-05-25 18:12:11 -07:00
net netfilter: nf_tables: check msg_type before nft_trans_set(trans) 2018-06-01 10:14:51 +02:00
samples x86/cpufeature: Guard asm_volatile_goto usage for BPF compilation 2018-05-13 21:49:14 +02:00
scripts checkpatch: fix macro argument precedence test 2018-05-25 18:12:11 -07:00
security Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-05-21 11:54:57 -07:00
sound ALSA: hda - Fix runtime PM 2018-05-24 20:16:47 +02:00
tools Merge branch 'akpm' (patches from Andrew) 2018-05-25 20:24:28 -07:00
usr kbuild: rename built-in.o to built-in.a 2018-03-26 02:01:19 +09:00
virt KVM: arm/arm64: VGIC/ITS save/restore: protect kvm_read_guest() calls 2018-05-15 13:36:53 +02:00
.clang-format clang-format: add configuration file 2018-04-11 10:28:35 -07:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap Merge candidates for 4.17 merge window 2018-04-06 17:35:43 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS MAINTAINERS/CREDITS: Drop METAG ARCHITECTURE 2018-03-05 16:34:24 +00:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS Merge branch 'akpm' (patches from Andrew) 2018-05-25 20:24:28 -07:00
Makefile Linux 4.17-rc6 2018-05-20 15:31:38 -07:00
README Docs: Added a pointer to the formatted docs to README 2018-03-21 09:02:53 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.