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Re: [XEN PATCH v3 03/16] misra: add deviations for direct inclusion guards
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Simone Ballarin <simone.ballarin@xxxxxxxxxxx>
- Date: Mon, 11 Mar 2024 15:14:22 +0100
- Cc: consulting@xxxxxxxxxxx, sstabellini@xxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 11 Mar 2024 14:14:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11/03/24 14:56, Jan Beulich wrote:
On 11.03.2024 13:00, Simone Ballarin wrote:
On 11/03/24 11:08, Jan Beulich wrote:
On 11.03.2024 09:59, Simone Ballarin wrote:
--- a/xen/arch/arm/include/asm/hypercall.h
+++ b/xen/arch/arm/include/asm/hypercall.h
@@ -1,3 +1,4 @@
+/* SAF-5-safe direct inclusion guard before */
#ifndef __XEN_HYPERCALL_H__
#error "asm/hypercall.h should not be included directly - include xen/hypercall.h
instead"
#endif
--- a/xen/arch/x86/include/asm/hypercall.h
+++ b/xen/arch/x86/include/asm/hypercall.h
@@ -2,6 +2,7 @@
* asm-x86/hypercall.h
*/
+/* SAF-5-safe direct inclusion guard before */
#ifndef __XEN_HYPERCALL_H__
#error "asm/hypercall.h should not be included directly - include xen/hypercall.h
instead"
#endif
Iirc it was said that this way checking for correct guards is suppressed
altogether in Eclair, which is not what we want. Can you clarify this,
please?
My first change was moving this check inside the guard.
You commented my patch saying that this would be an error because someone can
include it directly if it has already been included indirectly.
I replied telling that this was the case also before the change.
You agreed with me, and we decided that the correct thing would be fixing the
check and not apply my temporary change to address the finding.
Considering that the code should be amended, a SAF deviation seems to me
the most appropriate way for suppressing these findings.
Since I don't feel your reply addresses my question, asking differently: With
your change in place, will failure to have proper guards (later) in these
headers still be reported by Eclair?
Jan
No, if you put something between the check and the guard,
no violation will be reported.
--
Simone Ballarin, M.Sc.
Field Application Engineer, BUGSENG (https://bugseng.com)
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