From: "Graf (AWS), Alexander" <graf@amazon.de>
To: Vu Nguyen Anh Khoa <khoavna.tin.2225@gmail.com>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: The AWS Nitro Enclaves Team <aws-nitro-enclaves-devel@amazon.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] misc: nsm: require CAP_SYS_ADMIN for raw ioctl
Date: Sun, 21 Jun 2026 09:33:24 +0000 [thread overview]
Message-ID: <d0d2be34-5b0e-4ff5-98b5-1d7fddb3882e@amazon.com> (raw)
In-Reply-To: <20260621085743.76329-1-khoavna.tin.2225@gmail.com>
On 21.06.26 10:57, Vu Nguyen Anh Khoa wrote:
> NSM_IOCTL_RAW lets userspace submit raw NSM messages. The UAPI
> documents this ioctl as available only with CAP_SYS_ADMIN, but /dev/nsm
> is registered with mode 0666 and nsm_dev_ioctl() does not enforce that
> restriction.
>
> Reject unprivileged raw ioctl requests before accepting user-controlled
> NSM messages.
>
> Signed-off-by: Vu Nguyen Anh Khoa <khoavna.tin.2225@gmail.com>
This must have fallen through the cracks when I juggled with the
different versions during initial submission. Nice catch!
Reviewed-by: Alexander Graf <graf@amazon.com>
Alex
Amazon Web Services Development Center Germany GmbH
Tamara-Danz-Str. 13
10243 Berlin
Geschaeftsfuehrung: Christof Hellmis, Andreas Stieger
Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B
Sitz: Berlin
Ust-ID: DE 365 538 597
next prev parent reply other threads:[~2026-06-21 9:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-21 8:57 Vu Nguyen Anh Khoa
2026-06-21 8:57 ` [PATCH 2/2] misc: nsm: do not unlock mutex before locking it Vu Nguyen Anh Khoa
2026-06-21 9:33 ` Graf (AWS), Alexander
2026-06-21 9:33 ` Graf (AWS), Alexander [this message]
2026-06-25 22:23 ` [PATCH 1/2] misc: nsm: require CAP_SYS_ADMIN for raw ioctl Graf (AWS), Alexander
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