On Thu, Jan 14, 2021 at 01:39:57PM -0600, Josh Poimboeuf wrote: > Objtool appends a temporary fake jump at the end of alternative > replacement instructions. If the replacement code is empty -- resulting > in patched nops -- the fake jump doesn't have a section. When running > objtool with '--backtrace', the fake jump's missing section can cause > BT_FUNC() to trigger a seg fault when the NULL insn->sec is passed to > offstr(). > > Fix it by ensuring fake jumps always have a section. > > Fixes: 7697eee3ddd7 ("objtool: Add --backtrace support") > Reported-by: Sami Tolvanen <samitolva...@google.com> > Signed-off-by: Josh Poimboeuf <jpoim...@redhat.com>
This patch will probably end up getting dropped because fake jumps are going away \o/ -- Josh