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From: "Bryn M. Reeves" <bmr@redhat.com>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: dm-devel@lists.linux.dev, Tony Asleson <tasleson@redhat.com>,
	Alasdair Kergon <agk@redhat.com>,
	Zdenek Kabelac <zkabelac@redhat.com>,
	Benjamin Marzinski <bmarzins@redhat.com>
Subject: Re: [PATCH] dm: fix a buffer overflow in ioctl processing
Date: Thu, 9 Apr 2026 17:42:48 +0100	[thread overview]
Message-ID: <adfXCEMPDWBh_Bi0@redhat.com> (raw)
In-Reply-To: <510b5754-3944-6b4e-03b8-f3a7dc137944@redhat.com>

On Thu, Apr 09, 2026 at 05:49:58PM +0200, Mikulas Patocka wrote:
> Luckily, this bug has no security implications because:
> 1. Only root can issue device mapper ioctls
> 2. The commonly used libraries that communicate with device mapper
>    (libdevmapper and devicemapper-rs) use buffer size that is aligned to
>    8 bytes - thus, "outptr = align_ptr(outptr)" can't overshoot the input
>    buffer and the bug can't happen accidentally
> 
> Reported-by: Tony Asleson <tasleson@redhat.com>
> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Reviewed-by: Bryn M. Reeves <bmr@redhat.com>


      reply	other threads:[~2026-04-09 16:42 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-09 15:49 [PATCH] dm: fix a buffer overflow in ioctl processing Mikulas Patocka
2026-04-09 16:42 ` Bryn M. Reeves [this message]

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