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objtool: Preserve special st_shndx indexes in elf_update_symbol
[ Upstream commit 5141d3a ] elf_update_symbol fails to preserve the special st_shndx values between [SHN_LORESERVE, SHN_HIRESERVE], which results in it converting SHN_ABS entries into SHN_UNDEF, for example. Explicitly check for the special indexes and ensure these symbols are not marked undefined. Fixes: ead165f ("objtool: Fix symbol creation") Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220908215504.3686827-17-samitolvanen@google.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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