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Tue, 06 Jan 2026 04:30:35 -0800 (PST) From: Jens Axboe To: Raphael Pinsonneault-Thibeault Cc: jack@suse.cz, syzbot+3ee481e21fd75e14c397@syzkaller.appspotmail.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linux.dev, Yongpeng Yang In-Reply-To: <20251217190040.490204-2-rpthibeault@gmail.com> References: <2crvwmytxw5splvtauxdq6o3dt4rnnzuy22vcub45rjk354alr@6m66k3ucoics> <20251217190040.490204-2-rpthibeault@gmail.com> Subject: Re: [PATCH v2] loop: don't change loop device under exclusive opener in loop_set_status Message-Id: <176770263471.676302.4742936561051912973.b4-ty@kernel.dk> Date: Tue, 06 Jan 2026 05:30:34 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: b4 0.14.3 On Wed, 17 Dec 2025 14:00:40 -0500, Raphael Pinsonneault-Thibeault wrote: > loop_set_status() is allowed to change the loop device while there > are other openers of the device, even exclusive ones. > > In this case, it causes a KASAN: slab-out-of-bounds Read in > ext4_search_dir(), since when looking for an entry in an inlined > directory, e_value_offs is changed underneath the filesystem by > loop_set_status(). > > [...] Applied, thanks! [1/1] loop: don't change loop device under exclusive opener in loop_set_status commit: 08e136ebd193eae7d5eff4c66d576c4a2dabdc3f Best regards, -- Jens Axboe