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?
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