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Helge Deller 59a783dbc0 parisc: Avoid kernel panic triggered by invalid kprobe
When running gdb I was able to trigger this kernel panic:

 Kernel Fault: Code=26 (Data memory access rights trap) at addr 0000000000000060
 CPU: 0 PID: 1401 Comm: gdb-crash Not tainted 5.2.0-rc7-64bit+ #1053

      YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
 PSW: 00001000000001000000000000001111 Not tainted
 r00-03  000000000804000f 0000000040dee1a0 0000000040c78cf0 00000000b8d50160
 r04-07  0000000040d2b1a0 000000004360a098 00000000bbbe87b8 0000000000000003
 r08-11  00000000fac20a70 00000000fac24160 00000000fac1bbe0 0000000000000000
 r12-15  00000000fabfb79a 00000000fac244a4 0000000000010000 0000000000000001
 r16-19  00000000bbbe87b8 00000000f8f02910 0000000000010034 0000000000000000
 r20-23  00000000fac24630 00000000fac24630 000000006474e552 00000000fac1aa52
 r24-27  0000000000000028 00000000bbbe87b8 00000000bbbe87b8 0000000040d2b1a0
 r28-31  0000000000000000 00000000b8d501c0 00000000b8d501f0 0000000003424000
 sr00-03  0000000000423000 0000000000000000 0000000000000000 0000000000423000
 sr04-07  0000000000000000 0000000000000000 0000000000000000 0000000000000000

 IASQ: 0000000000000000 0000000000000000 IAOQ: 0000000040c78cf0 0000000040c78cf4
  IIR: 539f00c0    ISR: 0000000000000000  IOR: 0000000000000060
  CPU:        0   CR30: 00000000b8d50000 CR31: 00000000d22345e2
  ORIG_R28: 0000000040250798
  IAOQ[0]: parisc_kprobe_ss_handler+0x58/0x170
  IAOQ[1]: parisc_kprobe_ss_handler+0x5c/0x170
  RP(r2): parisc_kprobe_ss_handler+0x58/0x170
 Backtrace:
  [<0000000040206ff8>] handle_interruption+0x178/0xbb8
 Kernel panic - not syncing: Kernel Fault

Avoid this panic by checking the return value of kprobe_running() and
skip kprobe if none is currently active.

Cc: <stable@vger.kernel.org> # v5.2
Acked-by: Sven Schnelle <svens@stackframe.org>
Tested-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: Helge Deller <deller@gmx.de>
2019-07-17 23:11:28 +02:00
arch parisc: Avoid kernel panic triggered by invalid kprobe 2019-07-17 23:11:28 +02:00
block docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
certs Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" 2019-07-10 18:43:43 -07:00
crypto USB / PHY patches for 5.3-rc1 2019-07-11 15:40:06 -07:00
Documentation docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
drivers docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
fs docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
include docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
init docs: cgroup-v1: add it to the admin-guide book 2019-07-15 11:03:02 -03:00
ipc treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441 2019-06-05 17:37:17 +02:00
kernel docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
lib docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm docs: admin-guide: move sysctl directory to it 2019-07-15 11:03:01 -03:00
net pci-v5.3-changes 2019-07-15 20:44:49 -07:00
samples docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
scripts docs: driver-model: move it to the driver-api book 2019-07-15 11:03:02 -03:00
security docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
sound Driver Core and debugfs changes for 5.3-rc1 2019-07-12 12:24:03 -07:00
tools docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
usr docs: early-userspace: move to driver-api guide 2019-07-15 11:03:01 -03:00
virt ARM: 2019-07-12 15:35:14 -07:00
.clang-format Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-17 11:26:25 -07:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes
.gitignore .gitignore: exclude .get_maintainer.ignore and .gitattributes 2019-05-18 11:49:54 +09:00
.mailmap MAINTAINERS: Update my email address 2019-06-18 14:37:27 +01:00
COPYING
CREDITS docs: admin-guide: move sysctl directory to it 2019-07-15 11:03:01 -03:00
Kbuild Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
Makefile Kbuild updates for v5.3 2019-07-12 16:03:16 -07:00
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.