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Thu, 1 Feb 2024 09:18:24 +0000 (UTC) Received: from dovecot-director2.suse.de ([10.150.64.162]) by imap2.dmz-prg2.suse.org with ESMTPSA id Zsp/H+Bhu2XGTwAAn2gu4w (envelope-from ); Thu, 01 Feb 2024 09:18:24 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id 3A3A3A0809; Thu, 1 Feb 2024 10:18:24 +0100 (CET) Date: Thu, 1 Feb 2024 10:18:24 +0100 From: Jan Kara To: syzbot Cc: adilger.kernel@dilger.ca, axboe@kernel.dk, brauner@kernel.org, jack@suse.cz, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, nogikh@google.com, syzkaller-bugs@googlegroups.com, tytso@mit.edu Subject: Re: [syzbot] [ext4?] KASAN: slab-use-after-free Read in ext4_convert_inline_data_nolock Message-ID: <20240201091824.xat4nseembst5qoj@quack3> References: <000000000000b62cdb05f7dfab8b@google.com> <0000000000009e002e06104da983@google.com> 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=us-ascii Content-Disposition: inline In-Reply-To: <0000000000009e002e06104da983@google.com> Authentication-Results: smtp-out2.suse.de; none X-Spamd-Result: default: False [-0.10 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; BAYES_HAM(-3.00)[100.00%]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; URI_HIDDEN_PATH(1.00)[https://syzkaller.appspot.com/x/.config?x=9c35b3803e5ad668]; TAGGED_RCPT(0.00)[db6caad9ebd2c8022b41]; MIME_GOOD(-0.10)[text/plain]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; RCPT_COUNT_SEVEN(0.00)[11]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; MID_RHS_NOT_FQDN(0.50)[]; RCVD_TLS_ALL(0.00)[]; SUSPICIOUS_RECIPS(1.50)[]; SUBJECT_HAS_QUESTION(0.00)[] X-Spam-Level: X-Spam-Flag: NO X-Spam-Score: -0.10 On Thu 01-02-24 00:20:04, syzbot wrote: > syzbot suspects this issue was fixed by commit: > > commit 6f861765464f43a71462d52026fbddfc858239a5 > Author: Jan Kara > Date: Wed Nov 1 17:43:10 2023 +0000 > > fs: Block writes to mounted block devices > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1606d4ffe80000 > start commit: 3a93e40326c8 Merge tag 'for-linus' of git://git.kernel.org.. > git tree: upstream > kernel config: https://syzkaller.appspot.com/x/.config?x=9c35b3803e5ad668 > dashboard link: https://syzkaller.appspot.com/bug?extid=db6caad9ebd2c8022b41 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11a2cd05c80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=158e1f29c80000 > > If the result looks correct, please mark the issue as fixed by replying with: Yep, the reproducer seems to mess with the loop device itself. #syz fix: fs: Block writes to mounted block devices Honza -- Jan Kara SUSE Labs, CR