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Filename Latest commit message Latest commit date
Eric Dumazet a802ddbf41 tun: add mutex_unlock() call and napi.skb clearing in tun_get_user() 
[ Upstream commit 1efba987c48629c0c64703bb4ea76ca1a3771d17 ]

If both IFF_NAPI_FRAGS mode and XDP are enabled, and the XDP program
consumes the skb, we need to clear the napi.skb (or risk
a use-after-free) and release the mutex (or risk a deadlock)

WARNING: lock held when returning to user space!
5.5.0-rc6-syzkaller #0 Not tainted
------------------------------------------------
syz-executor.0/455 is leaving the kernel with locks still held!
1 lock held by syz-executor.0/455:
 #0: ffff888098f6e748 (&tfile->napi_mutex){+.+.}, at: tun_get_user+0x1604/0x3fc0 drivers/net/tun.c:1835

Fixes: 90e33d4594 ("tun: enable napi_gro_frags() for TUN/TAP driver")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: Petar Penkov <ppenkov@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-29 16:45:22 +01:00
arch hwrng: omap3-rom - Fix missing clock by probing with device tree 2020-01-26 10:01:03 +01:00
block block: fix memleak of bio integrity data 2020-01-26 10:01:09 +01:00
certs
crypto
Documentation hwrng: omap3-rom - Fix missing clock by probing with device tree 2020-01-26 10:01:03 +01:00
drivers tun: add mutex_unlock() call and napi.skb clearing in tun_get_user() 2020-01-29 16:45:22 +01:00
fs afs: Remove set but not used variables 'before', 'after' 2020-01-26 10:01:08 +01:00
include net: rtnetlink: validate IFLA_MTU attribute in rtnl_create_link() 2020-01-29 16:45:21 +01:00
init mm, debug_pagealloc: don't rely on static keys too early 2020-01-23 08:22:40 +01:00
ipc
kernel xdp: Fix cleanup on map free for devmap_hash map type 2020-01-26 10:01:08 +01:00
lib
LICENSES
mm mm/page-writeback.c: avoid potential division by zero in wb_min_max_ratio() 2020-01-23 08:22:41 +01:00
net tcp: do not leave dangling pointers in tp->highest_sack 2020-01-29 16:45:22 +01:00
samples samples/bpf: Fix broken xdp_rxq_info due to map order assumptions 2020-01-26 10:00:58 +01:00
scripts bpf: Force .BTF section start to zero when dumping from vmlinux 2020-01-26 10:00:58 +01:00
security
sound ALSA: usb-audio: fix sync-ep altsetting sanity check 2020-01-23 08:22:31 +01:00
tools kselftests: cgroup: Avoid the reuse of fd after it is deallocated 2020-01-26 10:01:07 +01:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile Linux 5.4.15 2020-01-26 10:01:09 +01:00
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.