Eric Dumazet fd851ba9ca udp: harden copy_linear_skb() ... syzkaller got crashes with CONFIG_HARDENED_USERCOPY=y configs. Issue here is that recvfrom() can be used with user buffer of Z bytes, and SO_PEEK_OFF of X bytes, from a skb with Y bytes, and following condition : Z < X < Y kernel BUG at mm/usercopy.c:72! invalid opcode: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 2917 Comm: syzkaller842281 Not tainted 4.13.0-rc3+ #16 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d2fa40c0 task.stack: ffff8801d1fe8000 RIP: 0010:report_usercopy mm/usercopy.c:64 [inline] RIP: 0010:__check_object_size+0x3ad/0x500 mm/usercopy.c:264 RSP: 0018:ffff8801d1fef8a8 EFLAGS: 00010286 RAX: 0000000000000078 RBX: ffffffff847102c0 RCX: 0000000000000000 RDX: 0000000000000078 RSI: 1ffff1003a3fded5 RDI: ffffed003a3fdf09 RBP: ffff8801d1fef998 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d1ea480e R13: fffffffffffffffa R14: ffffffff84710280 R15: dffffc0000000000 FS: 0000000001360880(0000) GS:ffff8801dc000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000202ecfe4 CR3: 00000001d1ff8000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: check_object_size include/linux/thread_info.h:108 [inline] check_copy_size include/linux/thread_info.h:139 [inline] copy_to_iter include/linux/uio.h:105 [inline] copy_linear_skb include/net/udp.h:371 [inline] udpv6_recvmsg+0x1040/0x1af0 net/ipv6/udp.c:395 inet_recvmsg+0x14c/0x5f0 net/ipv4/af_inet.c:793 sock_recvmsg_nosec net/socket.c:792 [inline] sock_recvmsg+0xc9/0x110 net/socket.c:799 SYSC_recvfrom+0x2d6/0x570 net/socket.c:1788 SyS_recvfrom+0x40/0x50 net/socket.c:1760 entry_SYSCALL_64_fastpath+0x1f/0xbe Fixes: b65ac44674 ("udp: try to avoid 2 cache miss on dequeue") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-08-11 15:00:45 -07:00
..
acpi	ACPI: NUMA: add missing include in acpi_numa.h	2017-07-24 22:27:43 +02:00
asm-generic	Merge branch 'work.uaccess-unaligned' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-15 11:17:52 -07:00
clocksource	…
crypto	crypto: engine - replace pr_xxx by dev_xxx	2017-06-19 14:19:54 +08:00
drm	i915, amd and some core fixes + mediatek color support	2017-07-13 11:26:18 -07:00
dt-bindings	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2017-07-15 10:59:54 -07:00
keys	…
kvm	KVM: arm/arm64: PMU: Fix overflow interrupt injection	2017-07-25 14:18:01 +01:00
linux	Pin control fixes for the v4.13 cycle:	2017-08-09 14:30:34 -07:00
math-emu	…
media	media: platform: davinci: drop VPFE_CMD_S_CCDC_RAW_PARAMS	2017-07-26 06:14:33 -04:00
memory	…
misc	cxl: Export library to support IBM XSL	2017-07-03 23:07:03 +10:00
net	udp: harden copy_linear_skb()	2017-08-11 15:00:45 -07:00
pcmcia	…
ras	trace, ras: add ARM processor error trace event	2017-06-22 18:22:05 +01:00
rdma	IB/cma: Fix reference count leak when no ipv4 addresses are set	2017-07-20 11:24:13 -04:00
rxrpc	…
scsi	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2017-07-13 14:27:32 -07:00
soc	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2017-07-05 12:31:59 -07:00
sound	ASoC: fix pcm-creation regression	2017-07-17 15:50:32 +01:00
target	iscsi-target: Add login_keys_workaround attribute for non RFC initiators	2017-07-11 10:56:39 -07:00
trace	ext4: remove unused metadata accounting variables	2017-07-30 22:30:11 -04:00
uapi	TTY/Serial fixes for 4.13-rc2	2017-07-22 09:00:24 -07:00
video	imx-drm: cleanups and YUV 4:2:0 memory read/write reduction support	2017-06-16 10:05:38 +10:00
xen	xen/balloon: don't online new memory initially	2017-07-23 08:13:18 +02:00