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Laura Abbott 8b89affb42 sunrpc: Don't use stack buffer with scatterlist 
[ Upstream commit 44090cc876 ]

Fedora got a bug report from NFS:

kernel BUG at include/linux/scatterlist.h:143!
...
RIP: 0010:sg_init_one+0x7d/0x90
..
  make_checksum+0x4e7/0x760 [rpcsec_gss_krb5]
  gss_get_mic_kerberos+0x26e/0x310 [rpcsec_gss_krb5]
  gss_marshal+0x126/0x1a0 [auth_rpcgss]
  ? __local_bh_enable_ip+0x80/0xe0
  ? call_transmit_status+0x1d0/0x1d0 [sunrpc]
  call_transmit+0x137/0x230 [sunrpc]
  __rpc_execute+0x9b/0x490 [sunrpc]
  rpc_run_task+0x119/0x150 [sunrpc]
  nfs4_run_exchange_id+0x1bd/0x250 [nfsv4]
  _nfs4_proc_exchange_id+0x2d/0x490 [nfsv4]
  nfs41_discover_server_trunking+0x1c/0xa0 [nfsv4]
  nfs4_discover_server_trunking+0x80/0x270 [nfsv4]
  nfs4_init_client+0x16e/0x240 [nfsv4]
  ? nfs_get_client+0x4c9/0x5d0 [nfs]
  ? _raw_spin_unlock+0x24/0x30
  ? nfs_get_client+0x4c9/0x5d0 [nfs]
  nfs4_set_client+0xb2/0x100 [nfsv4]
  nfs4_create_server+0xff/0x290 [nfsv4]
  nfs4_remote_mount+0x28/0x50 [nfsv4]
  mount_fs+0x3b/0x16a
  vfs_kern_mount.part.35+0x54/0x160
  nfs_do_root_mount+0x7f/0xc0 [nfsv4]
  nfs4_try_mount+0x43/0x70 [nfsv4]
  ? get_nfs_version+0x21/0x80 [nfs]
  nfs_fs_mount+0x789/0xbf0 [nfs]
  ? pcpu_alloc+0x6ca/0x7e0
  ? nfs_clone_super+0x70/0x70 [nfs]
  ? nfs_parse_mount_options+0xb40/0xb40 [nfs]
  mount_fs+0x3b/0x16a
  vfs_kern_mount.part.35+0x54/0x160
  do_mount+0x1fd/0xd50
  ksys_mount+0xba/0xd0
  __x64_sys_mount+0x21/0x30
  do_syscall_64+0x60/0x1f0
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

This is BUG_ON(!virt_addr_valid(buf)) triggered by using a stack
allocated buffer with a scatterlist. Convert the buffer for
rc4salt to be dynamically allocated instead.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1615258
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2018-09-15 09:45:26 +02:00
Documentation kbuild: verify that $DEPMOD is installed 2018-08-17 21:01:10 +02:00
arch arm64: mm: always enable CONFIG_HOLES_IN_ZONE 2018-09-09 19:56:02 +02:00
block block, bfq: return nbytes and not zero from struct cftype .write() method 2018-09-09 19:55:59 +02:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
drivers hv_netvsc: Fix a deadlock by getting rtnl lock earlier in netvsc_probe() 2018-09-15 09:45:26 +02:00
firmware License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fs hfs: prevent crash on exit from failed search 2018-09-15 09:45:26 +02:00
include r8169: add support for NCube 8168 network card 2018-09-15 09:45:25 +02:00
init init: rename and re-order boot_cpu_state_init() 2018-08-15 18:12:48 +02:00
ipc ipc/sem.c: prevent queue.status tearing in semop 2018-09-05 09:26:30 +02:00
kernel userns: move user access out of the mutex 2018-09-09 19:56:00 +02:00
lib printk/nmi: Prevent deadlock when accessing the main log buffer in NMI 2018-09-05 09:26:35 +02:00
mm mm/tlb: Remove tlb_remove_table() non-concurrent condition 2018-09-09 19:55:59 +02:00
net sunrpc: Don't use stack buffer with scatterlist 2018-09-15 09:45:26 +02:00
samples samples/bpf: Check the error of write() and read() 2018-08-24 13:09:12 +02:00
scripts gcc-plugins: Use dynamic initializers 2018-09-05 09:26:42 +02:00
security cap_inode_getsecurity: use d_find_any_alias() instead of d_find_alias() 2018-09-09 19:56:01 +02:00
sound ASoC: sirf: Fix potential NULL pointer dereference 2018-09-05 09:26:39 +02:00
tools perf auxtrace: Fix queue resize 2018-09-09 19:56:01 +02:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt KVM: arm/arm64: Skip updating PTE entry if no change 2018-09-05 09:26:36 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Add hch to .get_maintainer.ignore 2015-08-21 14:30:10 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
…
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS dt-bindings: Document mti,mips-cpc binding 2018-03-15 10:54:35 +01:00
Makefile Linux 4.14.69 2018-09-09 19:56:02 +02:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

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.