AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2025-01-22 10:13:16 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity
840,736 Commits 1 Branch 0 Tags 2 GiB
C 97.7%
Assembly 1.2%
Shell 0.3%
Makefile 0.3%
Python 0.2%
Other 0.1%
3b4929f65b
Go to file
Eric Dumazet 3b4929f65b tcp: limit payload size of sacked skbs 
Jonathan Looney reported that TCP can trigger the following crash
in tcp_shifted_skb() :

	BUG_ON(tcp_skb_pcount(skb) < pcount);

This can happen if the remote peer has advertized the smallest
MSS that linux TCP accepts : 48

An skb can hold 17 fragments, and each fragment can hold 32KB
on x86, or 64KB on PowerPC.

This means that the 16bit witdh of TCP_SKB_CB(skb)->tcp_gso_segs
can overflow.

Note that tcp_sendmsg() builds skbs with less than 64KB
of payload, so this problem needs SACK to be enabled.
SACK blocks allow TCP to coalesce multiple skbs in the retransmit
queue, thus filling the 17 fragments to maximal capacity.

CVE-2019-11477 -- u16 overflow of TCP_SKB_CB(skb)->tcp_gso_segs

Fixes: 832d11c5cd ("tcp: Try to restore large SKBs while SACK processing")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Jonathan Looney <jtl@netflix.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Tyler Hicks <tyhicks@canonical.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Bruce Curtis <brucec@netflix.com>
Cc: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-06-15 18:47:31 -07:00
arch bpf, x64: fix stack layout of JITed bpf code 2019-06-14 18:02:25 -07:00
block
certs
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2019-06-06 13:10:49 -07:00
Documentation tcp: add tcp_rx_skb_cache sysctl 2019-06-14 20:18:28 -07:00
drivers Revert "net: phylink: set the autoneg state in phylink_phy_change" 2019-06-15 18:10:30 -07:00
fs Changes since last update: 2019-06-06 12:36:54 -07:00
include tcp: limit payload size of sacked skbs 2019-06-15 18:47:31 -07:00
init
ipc
kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2019-06-15 18:19:47 -07:00
lib SPDX fixes for 5.2-rc3, round 2 2019-06-02 10:22:38 -07:00
LICENSES
mm
net tcp: limit payload size of sacked skbs 2019-06-15 18:47:31 -07:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2019-06-07 14:46:47 -07:00
scripts
security
sound
tools Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2019-06-15 18:19:47 -07:00
usr
virt Fixes for PPC and s390. 2019-06-02 10:19:39 -07:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-07 09:29:14 -07:00
Makefile Linux 5.2-rc3 2019-06-02 13:55:33 -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.