[0/9] livepatch-build-tools: some bug fixes and improvements

Message

Roger Pau Monné April 29, 2024, 2:56 p.m. UTC

Hello,

The first 3 patches in the series attempt to fix some bugs, I don't
think they will be specially controversial or difficult to review (patch
1 was already posted standalone).

The rest of the patches are more convoluted, as they attempt to solve
some shortcomings when attempting to create livepatches that change
alternatives or exceptions.  For example a patch that only changes
content in alternative blocks (the code that ends up in the
.altinstr_replacement section) won't work, as create-diff-object will
report that there are no changes.

I've attempted to test as many corner cases as I could come up with, but
it's hard to figure all the possible changes, plus it's also fairly easy
to inadvertently regress existing functionality.

Thanks, Roger.

Roger Pau Monne (9):
  livepatch-build-tools: allow patch file name sizes up to 127
    characters
  create-diff-object: update default alt_instr size
  livepatch-build: fix detection of structure sizes
  create-diff-object: document kpatch_regenerate_special_section()
    behavior
  create-diff-object: move kpatch_include_symbol()
  create-diff-object: detect changes in .altinstr_replacement and .fixup
    sections
  create-diff-object: don't account for changes to .bug_frame.? sections
  create-diff-object: account for changes in the special section itself
  create-diff-object: account for special section changes

 create-diff-object.c | 196 +++++++++++++++++++++++++++++++++----------
 livepatch-build      |  12 ++-
 2 files changed, 161 insertions(+), 47 deletions(-)