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s390/vdso: Create .build-id links for unstripped vdso files

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[ Upstream commit fc2f5f10f9bc5e58d38e9fda7dae107ac04a799f ]

Citing Andy Lutomirski from commit dda1e95cee38 ("x86/vdso: Create
.build-id links for unstripped vdso files"):

"With this change, doing 'make vdso_install' and telling gdb:

set debug-file-directory /lib/modules/KVER/vdso

will enable vdso debugging with symbols.  This is useful for
testing, but kernel RPM builds will probably want to manually delete
these symlinks or otherwise do something sensible when they strip
the vdso/*.so files."

Fixes: 4bff8cb54502 ("s390: convert to GENERIC_VDSO")
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jens Remus 2024-04-29 17:02:53 +02:00 committed by Greg Kroah-Hartman
parent 07423c9b43
commit 0e035cb818
1 changed files with 1 additions and 1 deletions
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2
scripts/Makefile.vdsoinst
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@ -21,7 +21,7 @@ $$(dest): $$(src) FORCE
$$(call cmd,install)
# Some architectures create .build-id symlinks
ifneq ($(filter arm sparc x86, $(SRCARCH)),)
ifneq ($(filter arm s390 sparc x86, $(SRCARCH)),)
link := $(install-dir)/.build-id/$$(shell $(READELF) -n $$(src) | sed -n 's@^.*Build ID: \(..\)\(.*\)@\1/\2@p').debug
__default: $$(link)