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Naveen N. Rao dab80aa013 recordmcount: Fix spurious mcount entries on powerpc 
[ Upstream commit 80e5302e4b ]

An impending change to enable HAVE_C_RECORDMCOUNT on powerpc leads to
warnings such as the following:

  # modprobe kprobe_example
  ftrace-powerpc: Not expected bl: opcode is 3c4c0001
  WARNING: CPU: 0 PID: 227 at kernel/trace/ftrace.c:2001 ftrace_bug+0x90/0x318
  Modules linked in:
  CPU: 0 PID: 227 Comm: modprobe Not tainted 5.2.0-rc6-00678-g1c329100b942 #2
  NIP:  c000000000264318 LR: c00000000025d694 CTR: c000000000f5cd30
  REGS: c000000001f2b7b0 TRAP: 0700   Not tainted  (5.2.0-rc6-00678-g1c329100b942)
  MSR:  900000010282b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE,TM[E]>  CR: 28228222  XER: 00000000
  CFAR: c0000000002642fc IRQMASK: 0
  <snip>
  NIP [c000000000264318] ftrace_bug+0x90/0x318
  LR [c00000000025d694] ftrace_process_locs+0x4f4/0x5e0
  Call Trace:
  [c000000001f2ba40] [0000000000000004] 0x4 (unreliable)
  [c000000001f2bad0] [c00000000025d694] ftrace_process_locs+0x4f4/0x5e0
  [c000000001f2bb90] [c00000000020ff10] load_module+0x25b0/0x30c0
  [c000000001f2bd00] [c000000000210cb0] sys_finit_module+0xc0/0x130
  [c000000001f2be20] [c00000000000bda4] system_call+0x5c/0x70
  Instruction dump:
  419e0018 2f83ffff 419e00bc 2f83ffea 409e00cc 4800001c 0fe00000 3c62ff96
  39000001 39400000 386386d0 480000c4 <0fe00000> 3ce20003 39000001 3c62ff96
  ---[ end trace 4c438d5cebf78381 ]---
  ftrace failed to modify
  [<c0080000012a0008>] 0xc0080000012a0008
   actual:   01:00:4c:3c
  Initializing ftrace call sites
  ftrace record flags: 2000000
   (0)
   expected tramp: c00000000006af4c

Looking at the relocation records in __mcount_loc shows a few spurious
entries:

  RELOCATION RECORDS FOR [__mcount_loc]:
  OFFSET           TYPE              VALUE
  0000000000000000 R_PPC64_ADDR64    .text.unlikely+0x0000000000000008
  0000000000000008 R_PPC64_ADDR64    .text.unlikely+0x0000000000000014
  0000000000000010 R_PPC64_ADDR64    .text.unlikely+0x0000000000000060
  0000000000000018 R_PPC64_ADDR64    .text.unlikely+0x00000000000000b4
  0000000000000020 R_PPC64_ADDR64    .init.text+0x0000000000000008
  0000000000000028 R_PPC64_ADDR64    .init.text+0x0000000000000014

The first entry in each section is incorrect. Looking at the
relocation records, the spurious entries correspond to the
R_PPC64_ENTRY records:

  RELOCATION RECORDS FOR [.text.unlikely]:
  OFFSET           TYPE              VALUE
  0000000000000000 R_PPC64_REL64     .TOC.-0x0000000000000008
  0000000000000008 R_PPC64_ENTRY     *ABS*
  0000000000000014 R_PPC64_REL24     _mcount
  <snip>

The problem is that we are not validating the return value from
get_mcountsym() in sift_rel_mcount(). With this entry, mcountsym is 0,
but Elf_r_sym(relp) also ends up being 0. Fix this by ensuring
mcountsym is valid before processing the entry.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Tested-by: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-07-31 07:28:53 +02:00
arch powerpc/xmon: Fix disabling tracing while in xmon 2019-07-31 07:28:53 +02:00
block block, bfq: NULL out the bic when it's no longer valid 2019-07-21 09:04:30 +02:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto crypto: chacha20poly1305 - fix atomic sleep when using async algorithm 2019-07-31 07:28:35 +02:00
Documentation dt-bindings: allow up to four clocks for orion-mdio 2019-07-31 07:28:43 +02:00
drivers PCI: xilinx-nwl: Fix Multi MSI data programming 2019-07-31 07:28:53 +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 nfsd: Fix overflow causing non-working mounts on 1 TB machines 2019-07-31 07:28:48 +02:00
include jbd2: introduce jbd2_inode dirty range scoping 2019-07-31 07:28:47 +02:00
init init: initialize jump labels before command line option parsing 2019-05-16 19:42:23 +02:00
ipc ipc: prevent lockup on alloc_msg and free_msg 2019-06-15 11:54:51 +02:00
kernel padata: use smp_mb in padata_reorder to avoid orphaned padata jobs 2019-07-31 07:28:39 +02:00
lib lib/strscpy: Shut up KASAN false-positives in strscpy() 2019-07-31 07:28:44 +02:00
mm mm: vmscan: scan anonymous pages on file refaults 2019-07-31 07:28:48 +02:00
net hvsock: fix epollout hang from race condition 2019-07-31 07:28:48 +02:00
samples samples, bpf: fix to change the buffer size for read() 2019-07-21 09:04:17 +02:00
scripts recordmcount: Fix spurious mcount entries on powerpc 2019-07-31 07:28:53 +02:00
security apparmor: enforce nullbyte at end of tag string 2019-06-25 11:36:51 +08:00
sound ALSA: hda/realtek: apply ALC891 headset fixup to one Dell machine 2019-07-31 07:28:38 +02:00
tools iio: iio-utils: Fix possible incorrect mask calculation 2019-07-31 07:28:53 +02:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt KVM: arm/arm64: vgic: Fix kvm_device leak in vgic_its_destroy 2019-07-21 09:04:24 +02:00
.cocciconfig
.get_maintainer.ignore
.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 MAINTAINERS: Add Sasha as a stable branch maintainer 2018-12-01 09:42:50 +01:00
Makefile kbuild: Add -Werror=unknown-warning-option to CLANG_FLAGS 2019-07-31 07:28:52 +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.