From: Vadim Fedorenko <vadim.fedorenko@linux.dev>
To: Jakub Kicinski <kuba@kernel.org>, Kuniyuki Iwashima <kuniyu@google.com>
Cc: richardcochran@gmail.com, andrew+netdev@lunn.ch,
davem@davemloft.net, edumazet@google.com, junjie.cao@intel.com,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
pabeni@redhat.com,
syzbot+c8c0e7ccabd456541612@syzkaller.appspotmail.com,
syzkaller-bugs@googlegroups.com, thostet@google.com
Subject: Re: [PATCH] ptp: guard ptp_clock_gettime() if neither gettimex64 nor
Date: Tue, 28 Oct 2025 23:45:13 +0000 [thread overview]
Message-ID: <cd154e3c-0cac-4ead-a3d0-39dc617efa74@linux.dev> (raw)
In-Reply-To: <20251028161309.596beef2@kernel.org>
On 28.10.2025 23:13, Jakub Kicinski wrote:
> On Tue, 28 Oct 2025 15:51:50 +0000 Kuniyuki Iwashima wrote:
>> From: Richard Cochran <richardcochran@gmail.com>
>> Date: Tue, 28 Oct 2025 07:09:41 -0700
>>> On Tue, Oct 28, 2025 at 05:51:43PM +0800, Junjie Cao wrote:
>>>> Syzbot reports a NULL function pointer call on arm64 when
>>>> ptp_clock_gettime() falls back to ->gettime64() and the driver provides
>>>> neither ->gettimex64() nor ->gettime64(). This leads to a crash in the
>>>> posix clock gettime path.
>>>
>>> Drivers must provide a gettime method.
>>>
>>> If they do not, then that is a bug in the driver.
>>
>> AFAICT, only GVE does not have gettime() and settime(), and
>> Tim (CCed) was preparing a fix and mostly ready to post it.
>
> cc: Vadim who promised me a PTP driver test :) Let's make sure we
> tickle gettime/setting in that test..
Heh, call gettime/settime is easy. But in case of absence of these callbacks
the kernel will crash - not sure we can gather good signal in such case?
next prev parent reply other threads:[~2025-10-28 23:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-28 9:51 [PATCH] ptp: guard ptp_clock_gettime() if neither gettimex64 nor Junjie Cao
2025-10-28 12:58 ` Pavan Chebbi
2025-10-28 14:09 ` Richard Cochran
2025-10-28 15:51 ` Kuniyuki Iwashima
2025-10-28 23:13 ` Jakub Kicinski
2025-10-28 23:45 ` Vadim Fedorenko [this message]
2025-10-28 23:54 ` Kuniyuki Iwashima
2025-10-28 23:56 ` Kuniyuki Iwashima
2025-10-28 23:56 ` Vadim Fedorenko
2025-10-29 16:37 ` Tim Hostetler
2025-10-29 18:55 ` Vadim Fedorenko
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=cd154e3c-0cac-4ead-a3d0-39dc617efa74@linux.dev \
--to=vadim.fedorenko@linux.dev \
--cc=andrew+netdev@lunn.ch \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=junjie.cao@intel.com \
--cc=kuba@kernel.org \
--cc=kuniyu@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=richardcochran@gmail.com \
--cc=syzbot+c8c0e7ccabd456541612@syzkaller.appspotmail.com \
--cc=syzkaller-bugs@googlegroups.com \
--cc=thostet@google.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;
as well as URLs for NNTP newsgroup(s).