Re: [ros-diffs] 02/08: [NTOSKRNL] Forbid processes without the Tcb prvilege to perform a user-mode hard-error BSOD.

Is there a point to this blatant behavior change?

Best regards,
Alex Ionescu

On Sun, Apr 1, 2018 at 3:04 PM, Hermès Bélusca-Maïto <
[email protected]> wrote:

> https://git.reactos.org/?p=reactos.git;a=commitdiff;h=
> f0729b30bb79d6f538cf2b9578ff8ebe7989f8d3
>
> commit f0729b30bb79d6f538cf2b9578ff8ebe7989f8d3
> Author:     Hermès Bélusca-Maïto <[email protected]>
> AuthorDate: Sun Apr 1 14:46:19 2018 +0200
> Commit:     Hermès Bélusca-Maïto <[email protected]>
> CommitDate: Sun Apr 1 22:39:31 2018 +0200
>
>     [NTOSKRNL] Forbid processes without the Tcb prvilege to perform a
> user-mode hard-error BSOD.
> ---
>  ntoskrnl/ex/harderr.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/ntoskrnl/ex/harderr.c b/ntoskrnl/ex/harderr.c
> index 84f409a1bb..a5200e3e74 100644
> --- a/ntoskrnl/ex/harderr.c
> +++ b/ntoskrnl/ex/harderr.c
> @@ -132,8 +132,18 @@ ExpRaiseHardError(IN NTSTATUS ErrorStatus,
>      /* Check if this error will shutdown the system */
>      if (ValidResponseOptions == OptionShutdownSystem)
>      {
> -        /* Check for privilege */
> -        if (!SeSinglePrivilegeCheck(SeShutdownPrivilege, PreviousMode))
> +        /*
> +         * Check if we have the privileges.
> +         *
> +         * NOTE: In addition to the Shutdown privilege we also check
> whether
> +         * the caller has the Tcb privilege. The purpose is to allow only
> +         * SYSTEM processes to "shutdown" the system on hard errors (BSOD)
> +         * while forbidding regular processes to do so. This behaviour
> differs
> +         * from Windows, where any user-mode process, as soon as it has
> the
> +         * Shutdown privilege, can trigger a hard-error BSOD.
> +         */
> +        if (!SeSinglePrivilegeCheck(SeTcbPrivilege, PreviousMode) ||
> +            !SeSinglePrivilegeCheck(SeShutdownPrivilege, PreviousMode))
>          {
>              /* No rights */
>              *Response = ResponseNotHandled;
>
>

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