On 02/03/2025 7:16 pm, Rudolf Marek wrote:
> Dne 01. 03. 25 v 23:48 Rudolf Marek napsal(a):
>> I don't know how slow is to do the jump back via far jump.
>
> I did some micro benchmark on Raptorlake platform using other
> operating system I'm very familiar with.
>
> I added following sequence to th
On 26/02/2025 10:48 pm, Rudolf Marek wrote:
> Hi Andrew,
>
> Dne 25. 02. 25 v 22:14 Andrew Cooper napsal(a):
>> As stand-in for "the reader", I'll point out that you need to add #DB to
>> that list or you're in for a rude surprise when running the x86
>&
On 25/02/2025 8:06 pm, Rudolf Marek wrote:
> Hi Andrew,
>
> Dne 25. 02. 25 v 19:10 Andrew Cooper napsal(a):
>> Very cunning. Yes it does, but the state needs to be safe to IRET back
>> to, and ...
>
> ... And intellectually very pleasing!
>
>>> Would it work
On 22/02/2025 8:43 pm, Rudolf Marek wrote:
> Hi,
>
> Dne 13. 02. 25 v 3:42 Andrew Cooper napsal(a):
>> The SYSCALL behaviour TLDR is:
>>
>> %rcx = %rip
>> %r11 = %eflags
>> %cs = fixed attr
>> %ss = fixed attr
>> %rip =
On 15/02/2025 12:07 am, Jennifer Miller wrote:
> On Fri, Feb 14, 2025 at 11:06:50PM +0000, Andrew Cooper wrote:
>> On 13/02/2025 11:24 pm, Jennifer Miller wrote:
>>> On Thu, Feb 13, 2025 at 09:24:18PM +0000, Andrew Cooper wrote:
>>> Still, I hadn't considered mis
On 13/02/2025 11:24 pm, Jennifer Miller wrote:
> On Thu, Feb 13, 2025 at 09:24:18PM +0000, Andrew Cooper wrote:
>>>> ; swap stacks as normal
>>>> movQWORD PTR gs:[rip+0x7f005f85],rsp # 0x6014
>>>> movrsp,QWORD PTR gs:[rip+0x7f02c56d]
On 14/02/2025 9:54 pm, Kees Cook wrote:
> On Fri, Feb 14, 2025 at 07:39:20PM +0000, Andrew Cooper wrote:
>> On 14/02/2025 7:22 pm, Kees Cook wrote:
>>> diff --git a/arch/x86/include/asm/cfi.h b/arch/x86/include/asm/cfi.h
>>> index ef5e0a698253..dfa2ba4cceca 100644
>
On 14/02/2025 7:22 pm, Kees Cook wrote:
> diff --git a/arch/x86/include/asm/cfi.h b/arch/x86/include/asm/cfi.h
> index ef5e0a698253..dfa2ba4cceca 100644
> --- a/arch/x86/include/asm/cfi.h
> +++ b/arch/x86/include/asm/cfi.h
> @@ -93,7 +93,7 @@
> *
> */
> enum cfi_mode {
> - CFI_AUTO,
On 13/02/2025 7:23 pm, Jann Horn wrote:
> On Thu, Feb 13, 2025 at 7:15 AM Jennifer Miller wrote:
>> Here is some napkin asm for this I wrote for the 64-bit syscall entrypoint,
>> I think more or less the same could be done for the other entrypoints.
>>
>> ```
>> endbr64
>> test rsp, rsp
>>
On 13/02/2025 8:28 pm, Kees Cook wrote:
> On Thu, Feb 13, 2025 at 01:31:30AM +0000, Andrew Cooper wrote:
>>>> Assuming this is an issue you all feel is worth addressing, I will
>>>> continue working on providing a patch. I'm concerned though that the
>>&
On 13/02/2025 2:09 am, Jann Horn wrote:
> On Thu, Feb 13, 2025 at 2:31 AM Andrew Cooper
> wrote:
>>>> Assuming this is an issue you all feel is worth addressing, I will
>>>> continue working on providing a patch. I'm concerned though that the
>>>&g
>> Assuming this is an issue you all feel is worth addressing, I will
>> continue working on providing a patch. I'm concerned though that the
>> overhead from adding a wrmsr on both syscall entry and exit to
>> overwrite and restore the KERNEL_GS_BASE MSR may be quite high, so
>> any feedback in re
On 29/05/2024 3:20 am, Gatlin Newhouse wrote:
> diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h
> index a3ec87d198ac..e3fbed9073f8 100644
> --- a/arch/x86/include/asm/bug.h
> +++ b/arch/x86/include/asm/bug.h
> @@ -13,6 +13,14 @@
> #define INSN_UD2 0x0b0f
> #define LEN_UD2
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