On Wed, Jun 29, 2016 at 7:28 PM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote:
> On Fri, Jun 24, 2016 at 6:57 PM, Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx> wrote:
>> 2016-06-24 18:39 GMT+03:00 Dmitry Vyukov <dvyukov@xxxxxxxxxx>:
>>> If CONFIG_KASAN is enabled and gcc is configured with
>>> --disable-initfini-array and/or gold linker is used,
>>> gcc emits .ctors/.dtors and .text.startup/.text.exit
>>> sections instead of .init_array/.fini_array.
>>> .dtors section is not explicitly accounted in the linker
>>> script and messes vvar/percpu layout. Want:
>>>
>>> ffffffff822bfd80 D _edata
>>> ffffffff822c0000 D __vvar_beginning_hack
>>> ffffffff822c0000 A __vvar_page
>>> ffffffff822c0080 0000000000000098 D vsyscall_gtod_data
>>> ffffffff822c1000 A __init_begin
>>> ffffffff822c1000 D init_per_cpu__irq_stack_union
>>> ffffffff822c1000 A __per_cpu_load
>>> ffffffff822d3000 D init_per_cpu__gdt_page
>>>
>>> Got:
>>>
>>> ffffffff8279a600 D _edata
>>> ffffffff8279b000 A __vvar_page
>>> ffffffff8279c000 A __init_begin
>>> ffffffff8279c000 D init_per_cpu__irq_stack_union
>>> ffffffff8279c000 A __per_cpu_load
>>> ffffffff8279e000 D __vvar_beginning_hack
>>> ffffffff8279e080 0000000000000098 D vsyscall_gtod_data
>>> ffffffff827ae000 D init_per_cpu__gdt_page
>>>
>>> This happens because __vvar_page and .vvar get different
>>> addresses in arch/x86/kernel/vmlinux.lds.S:
>>>
>>> . = ALIGN(PAGE_SIZE);
>>> __vvar_page = .;
>>>
>>> .vvar : AT(ADDR(.vvar) - LOAD_OFFSET) {
>>> /* work around gold bug 13023 */
>>> __vvar_beginning_hack = .;
>>>
>>> Discard .dtors/.fini_array/.text.exit, since we don't call dtors.
>>> Merge .text.startup into init text.
>>>
>>> Signed-off-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
>>
>> Reviewed-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
>
>
> Who can take it to some tree?
Arnd, you are listed as maintainer of this file. How can I get this
into mainline?
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