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Wed, 02 Oct 2024 18:32:30 -0700 (PDT) Date: Wed, 02 Oct 2024 18:32:30 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <66fdf42e.050a0220.28a3b.01f3.GAE@google.com> Subject: Re: [syzbot] [mm?] possible deadlock in upgrade_mmap_lock_carefully From: syzbot To: paul@paul-moore.com Cc: akpm@linux-foundation.org, ebpqwerty472123@gmail.com, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, paul@paul-moore.com, stephen.smalley.work@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 1BF3D1C000E X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: 3m81orqpdbsja5oi1ixsjjxw9c4sf9hs X-HE-Tag: 1727919151-494230 X-HE-Meta: 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 AVg2Kr90 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 aiVqUqml 5ktQ9vjXp6RIC1ojwz83sQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.002689, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > On Wed, Oct 2, 2024 at 8:14=E2=80=AFAM Shu Han wrote: >> >> It seems to be the same as [1]. >> New LSM hook position for remap_file_pages + IMA =3D deadlock. >> The new LSM hook position is added for a bypass caused by >> no check in remap_file_pages + READ_IMPLIES_EXEC in do_mmap. > > Thanks Shu Han, let's mark this as a dup and sort out a fix in the first = report. > > #syz dup: [syzbot] [integrity?] [lsm?] possible deadlock in can't find the dup bug > process_measurement (4) > >> I suggest fix it by removing the check and moving READ_IMPLIES_EXEC >> out of do_mmap[2]. >> >> Link: https://lore.kernel.org/lkml/20240928065620.7abadb2d8552f03d785c77= c9@linux-foundation.org/ >> [1] >> Link: https://lore.kernel.org/all/20240928180044.50-1-ebpqwerty472123@gm= ail.com/ >> [2] > > --=20 > paul-moore.com