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Naveen N. Rao 80e5302e4b recordmcount: Fix spurious mcount entries on powerpc 
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>
2019-07-01 16:26:54 +10:00
..
atomic locking/atomics: Don't assume that scripts are executable 2019-04-19 14:21:43 +02:00
basic treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
coccinelle fs: stream_open - opener for stream-like files so that read and write can run simultaneously without deadlock 2019-04-06 07:01:55 -10:00
dtc treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
gcc-plugins treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
gdb treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
genksyms treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
ksymoops Fix dead URLs to ftp.kernel.org 2017-03-28 16:16:52 +02:00
mod kbuild: modversions: Fix relative CRC byte order interpretation 2019-03-28 23:46:56 +09:00
package treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
selinux treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
tracing scripts: Add Python 3 support to tracing/draw_functrace.py 2018-07-29 11:08:38 +09:00
.gitignore scripts: remove unnecessary ihex2fw and check-lc_ctypes from .gitignore 2018-12-22 00:37:52 +09:00
adjust_autoksyms.sh kbuild: source include/config/auto.conf instead of ${KCONFIG_CONFIG} 2019-03-14 02:39:11 +09:00
asn1_compiler.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
bin2c.c kbuild: move bin2c back to scripts/ from scripts/basic/ 2018-07-18 01:18:05 +09:00
bloat-o-meter bloat-o-meter: ignore __addressable_ symbols 2018-12-28 12:11:44 -08:00
bootgraph.pl scripts: Switch to more portable Perl shebang 2017-05-14 11:20:44 +09:00
bpf_helpers_doc.py bpf: fix script for generating man page on BPF helpers 2019-05-13 01:12:45 +02:00
cc-can-link.sh bpfilter: check compiler capability in Kconfig 2018-06-28 13:36:39 +09:00
check_extable.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
checkincludes.pl License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
checkkconfigsymbols.py checkkconfigsymbols.py: support Kconfig's 'imply' statement 2017-02-03 11:49:06 +01:00
checkpatch.pl checkpatch.pl: Update DT vendor prefix check 2019-05-22 14:54:49 -05:00
checkstack.pl scripts/checkstack.pl: dynamic stack growth for aarch64 2018-12-28 12:11:44 -08:00
checksyscalls.sh checksyscalls: fix up mq_timedreceive and stat exceptions 2019-02-19 21:27:53 +01:00
checkversion.pl License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
clang-version.sh kbuild: update comment block of scripts/clang-version.sh 2019-03-04 22:34:54 +09:00
cleanfile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cleanpatch License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
coccicheck coccicheck: return proper error code on fail 2018-08-14 08:58:56 +09:00
config License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
conmakehash.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 54 2019-05-24 17:36:42 +02:00
const_structs.checkpatch const_structs.checkpatch: add frequently used from Julia Lawall's list 2016-10-11 15:06:30 -07:00
decode_stacktrace.sh scripts/decode_stacktrace.sh: handle RIP address with segment 2019-03-05 21:07:13 -08:00
decodecode scripts/decodecode: set ARCH when running natively on arm/arm64 2018-12-28 12:11:44 -08:00
depmod.sh kbuild: modules_install: warn when missing System.map file 2018-09-09 09:14:07 +09:00
diffconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
documentation-file-ref-check scripts/documentation-file-ref-check: detect broken :doc:foo 2019-05-03 06:45:22 -06:00
export_report.pl scripts: Switch to more portable Perl shebang 2017-05-14 11:20:44 +09:00
extract_xc3028.pl MAINTAINERS & files: Canonize the e-mails I use at files 2018-05-04 06:21:06 -04:00
extract-cert.c
extract-ikconfig
extract-module-sig.pl License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
extract-sys-certs.pl License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
extract-vmlinux extract-vmlinux: Check for uncompressed image as fallback 2018-10-17 08:18:01 +02:00
faddr2line scripts/faddr2line: fix location of start_kernel in comment 2018-11-18 10:15:09 -08:00
file-size.sh kbuild: Use ls(1) instead of stat(1) to obtain file size 2018-03-26 02:01:24 +09:00
find-unused-docs.sh scripts: Add a script to find unused documentation 2017-10-23 08:01:37 -06:00
gcc-goto.sh jump_label: move 'asm goto' support test to Kconfig 2019-01-06 09:46:51 +09:00
gcc-ld License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gcc-plugin.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
gcc-version.sh kbuild: clean up scripts/gcc-version.sh 2019-03-04 22:35:04 +09:00
gcc-x86_32-has-stack-protector.sh stack-protector: test compiler capability in Kconfig and drop AUTO mode 2018-06-08 18:56:00 +09:00
gcc-x86_64-has-stack-protector.sh stack-protector: Fix test with 32-bit userland and CONFIG_64BIT=y 2018-06-25 23:21:13 +09:00
gen_compile_commands.py scripts: add a tool to produce a compile_commands.json file 2018-12-19 23:41:36 +09:00
gen_ksymdeps.sh kbuild: simplify dependency generation for CONFIG_TRIM_UNUSED_KSYMS 2018-12-01 23:13:14 +09:00
get_dvb_firmware treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 2019-05-24 17:36:45 +02:00
get_maintainer.pl get_maintainer: allow option --mpath <directory> to read all files in <directory> 2018-08-22 10:52:48 -07:00
gfp-translate
headerdep.pl License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
headers_check.pl License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
headers_install.sh kbuild: Improve portability of some sed invocations 2018-03-26 02:01:18 +09:00
headers.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
insert-sys-cert.c KEYS: Reserve an extra certificate symbol for inserting without recompiling 2016-02-26 15:30:20 +00:00
kallsyms.c Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
Kbuild.include kbuild: drop support for cc-ldoption 2019-05-21 00:02:59 +09:00
Kconfig.include treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
kernel-doc kernel-doc: suppress 'not described' warnings for embedded struct fields 2019-01-16 15:04:01 -07:00
ld-version.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
leaking_addresses.pl leaking_addresses: Completely remove --version flag 2019-03-07 08:53:18 +11:00
Lindent License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
link-vmlinux.sh Kbuild updates for v5.2 2019-05-08 12:25:12 -07:00
Makefile scripts/gdb: do not descend into scripts/gdb from scripts 2019-02-27 21:40:09 +09:00
Makefile.asm-generic kbuild: force all architectures except um to include mandatory-y 2019-03-17 12:56:32 +09:00
Makefile.build Kbuild updates for v5.2 2019-05-08 12:25:12 -07:00
Makefile.clean kbuild: remove deprecated host-progs variable 2018-08-09 21:51:17 +09:00
Makefile.dtbinst DeviceTree for 4.15: 2017-11-14 18:25:40 -08:00
Makefile.extrawarn kbuild: add all Clang-specific flags unconditionally 2019-05-18 11:49:53 +09:00
Makefile.gcc-plugins gcc-plugins: structleak: Generalize to all variable types 2019-03-04 09:29:41 -08:00
Makefile.headersinst kbuild: generate asm-generic wrappers if mandatory headers are missing 2019-01-06 09:46:51 +09:00
Makefile.host kbuild: remove 'addtree' and 'flags' magic for header search paths 2019-05-18 11:49:57 +09:00
Makefile.kasan kasan: remove use after scope bugs detection. 2019-03-05 21:07:13 -08:00
Makefile.kcov treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile.lib dt-bindings: Pass binding directory to validation tools 2019-05-22 09:01:01 -05:00
Makefile.modbuiltin kbuild: use $(srctree) instead of KBUILD_SRC to check out-of-tree build 2019-04-02 23:28:04 +09:00
Makefile.modinst Revert "modsign: Abort modules_install when signing fails" 2019-03-17 12:56:31 +09:00
Makefile.modpost modpost: make KBUILD_MODPOST_WARN also configurable for external modules 2019-04-11 23:11:51 +09:00
Makefile.modsign kbuild: remove duplicated comments about PHONY 2018-07-06 22:04:03 +09:00
Makefile.ubsan ubsan: Remove vla bound checks. 2019-05-06 11:12:09 -07:00
makelst License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
markup_oops.pl scripts: Switch to more portable Perl shebang 2017-05-14 11:20:44 +09:00
mkcompile_h kbuild: remove unnecessary in-subshell execution 2019-01-28 09:11:17 +09:00
mkmakefile kbuild: mkmakefile: generate a simple wrapper of top Makefile 2019-04-02 23:27:38 +09:00
mksysmap
mkuboot.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
module-common.lds module: set .init_array alignment to 8 2017-03-13 09:40:28 -07:00
modules-check.sh kbuild: do not check name uniqueness of builtin modules 2019-05-21 08:54:05 +09:00
namespace.pl kbuild: rename built-in.o to built-in.a 2018-03-26 02:01:19 +09:00
objdiff scripts: objdiff: Ignore debug info when comparing 2017-03-11 11:13:38 +09:00
parse-maintainers.pl parse-maintainers: add ability to specify filenames 2017-11-17 16:10:01 -08:00
patch-kernel License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pnmtologo.c
profile2linkerlist.pl License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
prune-kernel License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
recordmcount.c scripts/recordmcount.{c,pl}: support -ffunction-sections .text.* section names 2018-12-08 20:54:08 -05:00
recordmcount.h recordmcount: Fix spurious mcount entries on powerpc 2019-07-01 16:26:54 +10:00
recordmcount.pl Kbuild updates for v5.2 2019-05-08 12:25:12 -07:00
setlocalversion scripts/setlocalversion: Improve -dirty check with git-status --no-optional-locks 2018-11-21 23:57:33 +09:00
show_delta
sign-file.c sign-file: fix build error in sign-file.c with libressl 2017-02-10 12:43:47 +11:00
sortextable.c powerpc: Build-time sort the exception table 2016-11-14 11:11:51 +11:00
sortextable.h
spdxcheck-test.sh scripts: add spdxcheck.py self test 2018-12-28 12:11:44 -08:00
spdxcheck.py scripts/spdxcheck.py: Add dual license subdirectory 2019-05-21 09:29:41 -06:00
spelling.txt scripts/spelling.txt: add more spellings to spelling.txt 2019-03-07 18:31:59 -08:00
sphinx-pre-install docs: scripts/sphinx-pre-install: suggest latexmk for building pdf 2019-04-01 14:33:48 -06:00
split-man.pl MAINTAINERS & files: Canonize the e-mails I use at files 2018-05-04 06:21:06 -04:00
stackdelta License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
stackusage License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
subarch.include selftests: add headers_install to lib.mk 2018-09-05 08:12:09 -06:00
tags.sh treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
unifdef.c unifdef: use memcpy instead of strncpy 2018-11-30 14:45:01 -08:00
ver_linux ver_linux: Assign constant RE to variable name for clarity 2019-01-22 13:34:35 +01:00
xen-hypercalls.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xz_wrap.sh