Kernel KVM virtualization development
 help / color / mirror / Atom feed
From: Heiko Carstens <hca@linux.ibm.com>
To: Steffen Eiden <seiden@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>,
	Janosch Frank <frankja@linux.ibm.com>,
	Claudio Imbrenda <imbrenda@linux.ibm.com>,
	David Hildenbrand <david@kernel.org>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Sven Schnelle <svens@linux.ibm.com>,
	Christoph Schlameuss <schlameuss@linux.ibm.com>,
	Harald Freudenberger <freude@linux.ibm.com>,
	kvm@vger.kernel.org, linux-s390@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/2] s390: uv: Fix loop condition in uv_find_secrets
Date: Wed, 12 Aug 2026 12:21:37 +0200	[thread overview]
Message-ID: <20260812102137.18999Bd8-hca@linux.ibm.com> (raw)
In-Reply-To: <20260811-uv_secrets_fix-v2-1-64444968ec55@linux.ibm.com>

On Tue, Aug 11, 2026 at 06:14:21PM +0200, Steffen Eiden wrote:
> Nothing modified `start_idx` between the assignment and the comparison,
> so the condition was always false and the do/while ran exactly once
> even when the UV returned UVC_RC_MORE_DATA. Systems with more than
> 85 UV secrets got -ENOENT for any secret past the first page.

If you would leave the first sentence away this would be much more readable.
Starting like above  makes me wonder: "what is this all about? context?".

> Fix this by setting the start index at the beginning of the loop not at

Please add reference to the function where you fix a loop.

> the end. First test if there are more secrets left by comparing
> start_idx with list->next_secret_idx, and then set the start index to the
> next secret index.
> 
> Fixes: 7c9137af2042 ("s390/uv: Retrieve UV secrets support")
> Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
> ---
>  arch/s390/kernel/uv.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)

Please also fix the patch subject: It should be "s390/uv:"
instead of "s390: uv:".

  reply	other threads:[~2026-08-12 10:21 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-11 16:14 [PATCH v2 0/2] s390: uv: Various fixes for UV secrets Steffen Eiden
2026-08-11 16:14 ` [PATCH v2 1/2] s390: uv: Fix loop condition in uv_find_secrets Steffen Eiden
2026-08-12 10:21   ` Heiko Carstens [this message]
2026-08-11 16:14 ` [PATCH v2 2/2] s390: uv: Prevent potential out-of-bounds read Steffen Eiden

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20260812102137.18999Bd8-hca@linux.ibm.com \
    --to=hca@linux.ibm.com \
    --cc=agordeev@linux.ibm.com \
    --cc=borntraeger@linux.ibm.com \
    --cc=david@kernel.org \
    --cc=frankja@linux.ibm.com \
    --cc=freude@linux.ibm.com \
    --cc=gor@linux.ibm.com \
    --cc=imbrenda@linux.ibm.com \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-s390@vger.kernel.org \
    --cc=schlameuss@linux.ibm.com \
    --cc=seiden@linux.ibm.com \
    --cc=svens@linux.ibm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox