From: Heiko Carstens <hca@linux.ibm.com>
To: Heiko Carstens <hca@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org
Subject: Re: [PATCH] s390/kprobes: Prevent kprobes on instructions with exception table entry
Date: Fri, 2 Oct 2026 10:59:21 +0200 [thread overview]
Message-ID: <20261002085921.21787C22-hca@linux.ibm.com> (raw)
In-Reply-To: <20260924115725.1108581-1-hca@linux.ibm.com>
On Thu, Sep 24, 2026 at 01:57:24PM +0200, Heiko Carstens wrote:
> The mvcos exception handler ex_handler_ua_mvcos() decodes the faulting
> instruction, assuming it is an mvcos instruction. In case the instruction
> is kprobed the decoded instruction is a breakpoint instruction instead,
> which leads to incorrect instruction decoding and potential register
> corruption.
>
> Fix this by simply preventing to set a kprobe on such instructions,
> similar like arm64 is doing it.
>
> Fixes: c488f5187a24 ("s390/uaccess: Shorten raw_copy_from_user() / raw_copy_to_user() inline assemblies")
> Cc: stable@vger.kernel.org
> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
> ---
> arch/s390/kernel/kprobes.c | 3 +++
> 1 file changed, 3 insertions(+)
This patch has been integrated as first patch into
https://lore.kernel.org/all/20261001103247.1989111-1-hca@linux.ibm.com/
prev parent reply other threads:[~2026-10-02 8:59 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-24 11:57 Heiko Carstens
2026-09-24 15:31 ` Heiko Carstens
2026-10-02 8:59 ` Heiko Carstens [this message]
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