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author | Hans de Goede <hdegoede@redhat.com> | 2020-03-17 16:08:41 +0300 |
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committer | Borislav Petkov <bp@suse.de> | 2020-03-17 17:59:12 +0300 |
commit | e4160b2e4b02377c67f8ecd05786811598f39acd (patch) | |
tree | fbfbb2146962bf64d57defc66c88746d12fd2681 /mm/Makefile | |
parent | e2ac07c06058ae2d58b45bbf2a2a352771d76fcb (diff) |
x86/purgatory: Fail the build if purgatory.ro has missing symbols
Linking purgatory.ro with -r enables "incremental linking"; this means
no checks for unresolved symbols are done while linking purgatory.ro.
A change to the sha256 code has caused the purgatory in 5.4-rc1 to have
a missing symbol on memzero_explicit(), yet things still happily build.
Add an extra check for unresolved symbols by calling ld without -r
before running bin2c to generate kexec-purgatory.c.
This causes a build of 5.4-rc1 with this patch added to fail as it should:
CHK arch/x86/purgatory/purgatory.ro
ld: arch/x86/purgatory/purgatory.ro: in function `sha256_transform':
sha256.c:(.text+0x1c0c): undefined reference to `memzero_explicit'
make[2]: *** [arch/x86/purgatory/Makefile:72:
arch/x86/purgatory/kexec-purgatory.c] Error 1
make[1]: *** [scripts/Makefile.build:509: arch/x86/purgatory] Error 2
make: *** [Makefile:1650: arch/x86] Error 2
Also remove --no-undefined from LDFLAGS_purgatory.ro as that has no
effect.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200317130841.290418-2-hdegoede@redhat.com
Diffstat (limited to 'mm/Makefile')
0 files changed, 0 insertions, 0 deletions