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The counterpart to the static branch case: a patch may add a static call to
a function which had none, so the .static_call_sites entry is new and there
is nothing in the original to correlate it against.
Where the key lives still decides whether that is allowed. A vmlinux key
is reachable; a module-owned one is not, for the same reason an existing
module key is not -- late module patching lets the livepatch load first and
the unresolved entry is dereferenced when the module arrives. Both halves
are here because they fail in opposite directions: dropping the new entry
leaves a static call the kernel never patches, and accepting a new
module-owned one is the corruption the check exists to prevent.
Both halves are one test over one fixture: built with -DNEW_CALL the key is
vmlinux's and the new entry has to be carried in; built with -DMODNAME as
well the key belongs to a module, klp diff has to reject it, and no output
object may be left behind. The premise is asserted first -- the original
must have no .static_call_sites at all -- since otherwise this is a second
copy of test-static-call-module-key.
Covers the same ground as corpus/x86_64/static-call-vmlinux-new and
corpus/x86_64/static-call-module-new in Joe Lawrence's klp-build unit test
corpus.
Assisted-by: Claude:claude-opus-4
Based-on-test-by: Joe Lawrence <joe.lawrence@redhat.com>
Assisted-by: Claude:claude-opus-5
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://patch.msgid.link/20260916184351.2720310-51-song@kernel.org
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