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Ziyang Xuan 991e634360 net: fix uninit-value in caif_seqpkt_sendmsg When nr_segs equal to zero in iovec_from_user, the object msg->msg_iter.iov is uninit stack memory in caif_seqpkt_sendmsg which is defined in ___sys_sendmsg. So we cann't just judge msg->msg_iter.iov->base directlly. We can use nr_segs to judge msg in caif_seqpkt_sendmsg whether has data buffers. ===================================================== BUG: KMSAN: uninit-value in caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343 ___sys_sendmsg net/socket.c:2397 [inline] __sys_sendmmsg+0x808/0xc90 net/socket.c:2480 __compat_sys_sendmmsg net/compat.c:656 [inline] Reported-by: syzbot+09a5d591c1f98cf5efcb@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?id=1ace85e8fc9b0d5a45c08c2656c3e91762daa9b8 Fixes: `bece7b2398` ("caif: Rewritten socket implementation") Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2021-07-15 11:08:33 -07:00
arch	Networking fixes for 5.14-rc2, including fixes from bpf and netfilter.	2021-07-14 09:24:32 -07:00
block	block-5.14-2021-07-08	2021-07-09 12:05:33 -07:00
certs
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2021-07-09 11:00:44 -07:00
Documentation	Networking fixes for 5.14-rc2, including fixes from bpf and netfilter.	2021-07-14 09:24:32 -07:00
drivers	liquidio: Fix unintentional sign extension issue on left shift of u16	2021-07-15 10:27:33 -07:00
fs	fs: add vfs_parse_fs_param_source() helper	2021-07-14 09:19:06 -07:00
include	net_sched: introduce tracepoint trace_qdisc_enqueue()	2021-07-15 10:32:38 -07:00
init	Kbuild updates for v5.14	2021-07-10 11:01:38 -07:00
ipc
kernel	Networking fixes for 5.14-rc2, including fixes from bpf and netfilter.	2021-07-14 09:24:32 -07:00
lib	mm/page_alloc: Revert pahole zero-sized workaround	2021-07-10 16:09:39 -07:00
LICENSES
mm	mm: Make copy_huge_page() always available	2021-07-12 11:30:56 -07:00
net	net: fix uninit-value in caif_seqpkt_sendmsg	2021-07-15 11:08:33 -07:00
samples	Networking fixes for 5.14-rc2, including fixes from bpf and netfilter.	2021-07-14 09:24:32 -07:00
scripts	Kbuild updates for v5.14	2021-07-10 11:01:38 -07:00
security	asm-generic/unaligned: Unify asm/unaligned.h around struct helper	2021-07-02 12:43:40 -07:00
sound	sound fixes for 5.14-rc1	2021-07-09 11:40:26 -07:00
tools	Networking fixes for 5.14-rc2, including fixes from bpf and netfilter.	2021-07-14 09:24:32 -07:00
usr
virt
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.cocciconfig
.get_maintainer.ignore
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COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	Networking fixes for 5.14-rc2, including fixes from bpf and netfilter.	2021-07-14 09:24:32 -07:00
Makefile	Linux 5.14-rc1	2021-07-11 15:07:40 -07:00
README

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.

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.