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Re: [PATCH] x86/boot: Drop stale comment about zeroing the stack
- To: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 23 Sep 2024 13:32:21 +0200
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 23 Sep 2024 11:32:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.09.2024 15:16, Frediano Ziglio wrote:
> On Mon, Sep 16, 2024 at 12:58 PM Andrew Cooper
> <andrew.cooper3@xxxxxxxxxx> wrote:
>>
>> This used to be true, but was altered by commit 37786b23b027 ("x86/cet:
>> Remove
>> writeable mapping of the BSPs shadow stack") which moved cpu0_stack into
>> .init.bss.stack_aligned.
>>
>> Fixes: 37786b23b027 ("x86/cet: Remove writeable mapping of the BSPs shadow
>> stack")
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
>> --- a/xen/arch/x86/boot/head.S
>> +++ b/xen/arch/x86/boot/head.S
>> @@ -652,11 +652,7 @@ trampoline_setup:
>> cmpb $0, sym_esi(efi_platform)
>> jnz 1f
>>
>> - /*
>> - * Initialise the BSS.
>> - *
>> - * !!! WARNING - also zeroes the current stack !!!
>> - */
>> + /* Initialise the BSS. */
>> lea sym_esi(__bss_start), %edi
>> lea sym_esi(__bss_end), %ecx
>> sub %edi,%ecx
>>
>> base-commit: a8bf14f6f331d4f428010b4277b67c33f561ed19
>
> Nice to know!
>
> Acked-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
Frediano, just FYI on the formal aspects here (which we don't always follow to
the letter, but still): If you had offered Reviewed-by:, Andrew would have been
fine to commit with just that. You can't just ack anything you're not
maintainer for (or really: you can, but formally it has no meaning).
Jan
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