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powerpc: Do not consider weak unresolved symbol relocations as bad

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Commit 8580ac9404 ("bpf: Process in-kernel BTF") introduced two weak
symbols that may be unresolved at link time which result in an absolute
relocation to 0. relocs_check.sh emits the following warning:

"WARNING: 2 bad relocations
c000000001a41478 R_PPC64_ADDR64    _binary__btf_vmlinux_bin_start
c000000001a41480 R_PPC64_ADDR64    _binary__btf_vmlinux_bin_end"

whereas those relocations are legitimate even for a relocatable kernel
compiled with -pie option.

relocs_check.sh already excluded some weak unresolved symbols explicitly:
remove those hardcoded symbols and add some logic that parses the symbols
using nm, retrieves all the weak unresolved symbols and excludes those from
the list of the potential bad relocations.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200118170335.21440-1-alex@ghiti.fr
This commit is contained in:
Alexandre Ghiti 2020-01-18 12:03:35 -05:00 committed by Michael Ellerman
parent 4119622488
commit 43e76cd368
2 changed files with 14 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/Makefile.postlink
View File

@ -17,11 +17,11 @@ quiet_cmd_head_check = CHKHEAD $@
quiet_cmd_relocs_check = CHKREL $@
ifdef CONFIG_PPC_BOOK3S_64
cmd_relocs_check = \
$(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/relocs_check.sh "$(OBJDUMP)" "$@" ; \
$(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/relocs_check.sh "$(OBJDUMP)" "$(NM)" "$@" ; \
$(BASH) $(srctree)/arch/powerpc/tools/unrel_branch_check.sh "$(OBJDUMP)" "$@"
else
cmd_relocs_check = \
$(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/relocs_check.sh "$(OBJDUMP)" "$@"
$(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/relocs_check.sh "$(OBJDUMP)" "$(NM)" "$@"
endif
# `@true` prevents complaint when there is nothing to be done

20
arch/powerpc/tools/relocs_check.sh
View File

@ -10,14 +10,21 @@
# based on relocs_check.pl
# Copyright © 2009 IBM Corporation
if [ $# -lt 2 ]; then
echo "$0 [path to objdump] [path to vmlinux]" 1>&2
if [ $# -lt 3 ]; then
echo "$0 [path to objdump] [path to nm] [path to vmlinux]" 1>&2
exit 1
fi
# Have Kbuild supply the path to objdump so we handle cross compilation.
# Have Kbuild supply the path to objdump and nm so we handle cross compilation.
objdump="$1"
vmlinux="$2"
nm="$2"
vmlinux="$3"
# Remove from the bad relocations those that match an undefined weak symbol
# which will result in an absolute relocation to 0.
# Weak unresolved symbols are of that form in nm output:
# " w _binary__btf_vmlinux_bin_end"
undef_weak_symbols=$($nm "$vmlinux" | awk '$1 ~ /w/ { print $2 }')
bad_relocs=$(
$objdump -R "$vmlinux" |
@ -26,8 +33,6 @@ $objdump -R "$vmlinux" |
# These relocations are okay
# On PPC64:
# R_PPC64_RELATIVE, R_PPC64_NONE
# R_PPC64_ADDR64 mach_<name>
# R_PPC64_ADDR64 __crc_<name>
# On PPC:
# R_PPC_RELATIVE, R_PPC_ADDR16_HI,
# R_PPC_ADDR16_HA,R_PPC_ADDR16_LO,
@ -39,8 +44,7 @@ R_PPC_ADDR16_HI
R_PPC_ADDR16_HA
R_PPC_RELATIVE
R_PPC_NONE' |
grep -E -v '\<R_PPC64_ADDR64[[:space:]]+mach_' |
grep -E -v '\<R_PPC64_ADDR64[[:space:]]+__crc_'
([ "$undef_weak_symbols" ] && grep -F -w -v "$undef_weak_symbols" || cat)
)
if [ -z "$bad_relocs" ]; then