From: Norbert Manthey <nmanthey@amazon.de>
To: Julien Grall <julien@xen.org>, <xen-devel@lists.xenproject.org>
Cc: Ian Jackson <iwj@xenproject.org>, Juergen Gross <jgross@suse.com>,
Wei Liu <wl@xen.org>, Julien Grall <jgrall@amazon.co.uk>,
Michael Kurth <mku@amazon.de>
Subject: Re: [PATCH XENSTORE v1 10/10] xs: add error handling
Date: Fri, 26 Feb 2021 16:26:10 +0100 [thread overview]
Message-ID: <b035a1f0-70b5-9224-b8ac-a1dd9dff06da@amazon.de> (raw)
In-Reply-To: <78560c14-81dc-05de-26f8-15861459806d@xen.org>
On 2/26/21 3:53 PM, Julien Grall wrote:
> Hi Norbert,
>
> On 26/02/2021 14:41, Norbert Manthey wrote:
>> In case of a failure deep in the call tree, we might return NULL as the
>> value of the domain. In that case, error out instead of dereferencing
>> the NULL pointer.
>>
>> This bug was discovered and resolved using Coverity Static Analysis
>> Security Testing (SAST) by Synopsys, Inc.
>
> This commit message is not very descriptive. Internally, I suggested:
>
> "
> tools/xenstore: Harden xs_domain_is_introduced()
>
> The function single_with_domid() may return NULL if something
> went wrong (e.g. XenStored returns an error or the connection is
> in bad state).
>
> They are unlikely but not impossible, so it would be better to
> return an error and allow the caller to handle it gracefully rather
> than crashing.
>
> In this case we should treat it as the domain has disappeared (i.e.
> return false) as the caller will not likely going to be able to
> communicate with XenStored again.
>
> This bug was discovered and resolved using Coverity Static Analysis
> Security Testing (SAST) by Synopsys, Inc.
> "
>
> I would have expected this to be addressed given that...
Understood. I will iterate.
Norbert
>
>>
>> Signed-off-by: Norbert Manthey <nmanthey@amazon.de>
>> Reviewed-by: Julien Grall <jgrall@amazon.co.uk
> ... you carried over my reviewed-by tag.
>
>
> Cheers,
>
> --
> Julien Grall
Amazon Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B
Sitz: Berlin
Ust-ID: DE 289 237 879
next prev parent reply other threads:[~2021-02-26 15:26 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-26 14:41 [PATCH XENSTORE v1 00/10] Code analysis fixes Norbert Manthey
2021-02-26 14:41 ` [PATCH XENSTORE v1 01/10] xenstore: add missing NULL check Norbert Manthey
2021-03-02 5:07 ` Jürgen Groß
2021-03-03 16:07 ` Ian Jackson
2021-02-26 14:41 ` [PATCH XENSTORE v1 02/10] xenstore: fix print format string Norbert Manthey
2021-03-02 5:07 ` Jürgen Groß
2021-03-03 16:08 ` Ian Jackson
2021-02-26 14:41 ` [PATCH XENSTORE v1 03/10] xenstore: check formats of trace Norbert Manthey
2021-03-02 5:08 ` Jürgen Groß
2021-03-03 16:08 ` Ian Jackson
2021-02-26 14:41 ` [PATCH XENSTORE v1 04/10] xenstore_client: handle memory on error Norbert Manthey
2021-03-02 5:08 ` Jürgen Groß
2021-03-03 16:10 ` Ian Jackson
2021-02-26 14:41 ` [PATCH XENSTORE v1 05/10] xenstore: handle daemon creation errors Norbert Manthey
2021-03-02 5:08 ` Jürgen Groß
2021-03-03 16:10 ` Ian Jackson
2021-02-26 14:41 ` [PATCH XENSTORE v1 06/10] xenstored: handle port reads correctly Norbert Manthey
2021-02-26 15:36 ` Andrew Cooper
2021-03-02 5:15 ` Jürgen Groß
2021-03-02 7:48 ` Norbert Manthey
2021-03-02 8:12 ` Jürgen Groß
2021-02-26 14:41 ` [PATCH XENSTORE v1 07/10] xenstore: handle do_mkdir and do_rm failure Norbert Manthey
2021-03-02 5:09 ` Jürgen Groß
2021-03-03 16:11 ` Ian Jackson
2021-02-26 14:41 ` [PATCH XENSTORE v1 08/10] xenstore: add missing NULL check Norbert Manthey
2021-03-02 5:10 ` Jürgen Groß
2021-03-03 16:11 ` Ian Jackson
2021-02-26 14:41 ` [PATCH XENSTORE v1 09/10] xs: handle daemon socket error Norbert Manthey
2021-03-02 5:10 ` Jürgen Groß
2021-03-03 16:13 ` Ian Jackson
2021-03-04 14:58 ` Norbert Manthey
2021-03-04 15:04 ` Ian Jackson
2021-02-26 14:41 ` [PATCH XENSTORE v1 10/10] xs: add error handling Norbert Manthey
2021-02-26 14:53 ` Julien Grall
2021-02-26 15:26 ` Norbert Manthey [this message]
2021-03-02 5:11 ` Jürgen Groß
2021-03-03 16:13 ` Ian Jackson
2021-03-01 18:01 ` [for-4.15] Re: [PATCH XENSTORE v1 00/10] Code analysis fixes Julien Grall
2021-03-01 19:39 ` Andrew Cooper
2021-03-02 10:04 ` Julien Grall
2021-03-03 18:45 ` Julien Grall
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