Linux kernel stable tree (mirror) https://git.radix-linux.su/kernel/linux.git/atom?h=v6.19.11 2025-10-14T21:50:19+00:00 2025-10-14T21:50:19+00:00 Josh Poimboeuf jpoimboe@kernel.org 2025-09-17T16:04:08+00:00 urn:sha1:24ebfcd65a871df4555b98c49c9ed9a92f146113 Add a klp-build script which automates the generation of a livepatch module from a source .patch file by performing the following steps: - Builds an original kernel with -function-sections and -fdata-sections, plus objtool function checksumming. - Applies the .patch file and rebuilds the kernel using the same options. - Runs 'objtool klp diff' to detect changed functions and generate intermediate binary diff objects. - Builds a kernel module which links the diff objects with some livepatch module init code (scripts/livepatch/init.c). - Finalizes the livepatch module (aka work around linker wreckage) using 'objtool klp post-link'. Acked-by: Petr Mladek <pmladek@suse.com> Tested-by: Joe Lawrence <joe.lawrence@redhat.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> 2025-10-14T21:50:19+00:00 Josh Poimboeuf jpoimboe@kernel.org 2025-09-17T16:04:06+00:00 urn:sha1:abaf1f42ddd070662fb419aed29c985ea209bd88 The __LINE__ macro creates challenges for binary diffing. When a .patch file adds or removes lines, it shifts the line numbers for all code below it. This can cause the code generation of functions using __LINE__ to change due to the line number constant being embedded in a MOV instruction, despite there being no semantic difference. Avoid such false positives by adding a fix-patch-lines script which can be used to insert a #line directive in each patch hunk affecting the line numbering. This script will be used by klp-build, which will be introduced in a subsequent patch. Acked-by: Petr Mladek <pmladek@suse.com> Tested-by: Joe Lawrence <joe.lawrence@redhat.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>