linux-toradex.git/tools/objtool/tests/generic/test-jump-label-module-key.sh, branch master Linux kernel for Apalis and Colibri modules objtool/klp: Add test for rejecting module-owned static branch keys 2026-09-21T09:04:58+00:00 Puranjay Mohan puranjay@kernel.org 2026-09-16T18:43:13+00:00 bd5e5fc7d6456e0669f47a3e10150ad05ae9d249 A static branch key belonging to a module cannot be reached with a klp relocation: the patch may be applied after that module's static branch init has run, which corrupts the code. Emitting one anyway produces a module which loads and then BUG()s the first time the key changes state, so klp diff has to refuse it. The fixture differs from the accepted case only in the module name recorded in .modinfo. Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Signed-off-by: Song Liu <song@kernel.org> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Assisted-by: Claude:claude-opus-5 Link: https://patch.msgid.link/20260916184351.2720310-21-song@kernel.org 
A static branch key belonging to a module cannot be reached with a klp
relocation: the patch may be applied after that module's static branch init
has run, which corrupts the code.  Emitting one anyway produces a module
which loads and then BUG()s the first time the key changes state, so klp
diff has to refuse it.

The fixture differs from the accepted case only in the module name recorded
in .modinfo.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Assisted-by: Claude:claude-opus-5
Link: https://patch.msgid.link/20260916184351.2720310-21-song@kernel.org