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Re: [PATCH v2 4/4] xen: riscv: enable stack protector feature
- To: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 2 Dec 2024 09:12:57 +0100
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- Cc: Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 02 Dec 2024 08:13:06 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30.11.2024 02:10, Volodymyr Babchuk wrote:
> Enable previously added CONFIG_STACK_PROTECTOR feature for RISC-V
> platform. Here we can call boot_stack_chk_guard_setup() in start_xen()
> function, because it never returns, so stack protector code will not
> be triggered because of changed canary.
>
> Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
> Tested-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
Isn't this premature? For ...
> @@ -57,6 +58,8 @@ void __init noreturn start_xen(unsigned long bootcpu_id,
> if ( !boot_fdt_info(device_tree_flattened, dtb_addr) )
> BUG();
>
> + boot_stack_chk_guard_setup();
... this function's use of get_random(), either arch_get_random() needs
to be implemented, or (as Julien also pointed out for Arm64) NOW() needs
to work. Yet get_s_time() presently expands to just BUG_ON(). Given this
it's not even clear to me how Oleksii managed to actually test this.
Jan
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