4.19-stable review patch. If anyone has any objections, please let me know.
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From: Josh Poimboeuf jpoimboe@redhat.com
commit f76a16adc485699f95bb71fce114f97c832fe664 upstream.
The .orc_unwind section is a packed array of 6-byte structs. It's currently aligned to 6 bytes, which is causing warnings in the LLD linker.
Six isn't a power of two, so it's not a valid alignment value. The actual alignment doesn't matter much because it's an array of packed structs. An alignment of two is sufficient. In reality it always gets aligned to four bytes because it comes immediately after the 4-byte-aligned .orc_unwind_ip section.
Fixes: ee9f8fce9964 ("x86/unwind: Add the ORC unwinder") Reported-by: Nick Desaulniers ndesaulniers@google.com Reported-by: Dmitry Golovin dima@golovin.in Reported-by: Sedat Dilek sedat.dilek@gmail.com Signed-off-by: Josh Poimboeuf jpoimboe@redhat.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Tested-by: Sedat Dilek sedat.dilek@gmail.com Cc: Peter Zijlstra peterz@infradead.org Cc: stable@vger.kernel.org Link: https://github.com/ClangBuiltLinux/linux/issues/218 Link: https://lkml.kernel.org/r/d55027ee95fe73e952dcd8be90aebd31b0095c45.155189204... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- include/asm-generic/vmlinux.lds.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -727,7 +727,7 @@ KEEP(*(.orc_unwind_ip)) \ __stop_orc_unwind_ip = .; \ } \ - . = ALIGN(6); \ + . = ALIGN(2); \ .orc_unwind : AT(ADDR(.orc_unwind) - LOAD_OFFSET) { \ __start_orc_unwind = .; \ KEEP(*(.orc_unwind)) \