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AJvYcCWfGD9NVTGL9KtckzVa2fdDVIIwQFrViEKkFmOHgZ0ToKl9h0fwAB/+kQSpMs+safiCTSFoEZYcyw==@kvack.org X-Gm-Message-State: AOJu0YzblsGo65OGb+/jqAoCl6tzNmy9m9w7ZgXrGkljgnj2KDO9tYjo GPqXGNEusCgAqAQ2tAJB3wi+y9agy1BKHp6oeWLgINmd74f1Ys5TrWXg/XUxP4hsg3b7nnM9YZS bgcup868QF3C53RlU9w4zAW1HIM4KIDT10myu X-Google-Smtp-Source: AGHT+IEbVY1kbBy7Zvdg6LTdE8R8kX8+B6u0Br4EdVIQKNUv+ElQOZkculpkmZ6/3yWZbwNAEb/Oy3sfRqUQg6acQo0= X-Received: by 2002:a05:6902:2012:b0:e25:e3a6:fcbe with SMTP id 3f1490d57ef6-e263840f491mr4534934276.43.1727923964741; Wed, 02 Oct 2024 19:52:44 -0700 (PDT) MIME-Version: 1.0 References: <66fdf42e.050a0220.28a3b.01f3.GAE@google.com> In-Reply-To: <66fdf42e.050a0220.28a3b.01f3.GAE@google.com> From: Paul Moore Date: Wed, 2 Oct 2024 22:52:34 -0400 Message-ID: Subject: Re: [syzbot] [mm?] possible deadlock in upgrade_mmap_lock_carefully To: syzbot Cc: akpm@linux-foundation.org, ebpqwerty472123@gmail.com, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, stephen.smalley.work@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: D2176A0008 X-Stat-Signature: gfqhmokopgiu9wj7gicdzj4mmiqqeguo X-Rspam-User: X-HE-Tag: 1727923965-110826 X-HE-Meta: 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 z01aICGK 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.018554, 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 9:32=E2=80=AFPM syzbot wrote: > > 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 firs= t report. > > > > #syz dup: [syzbot] [integrity?] [lsm?] possible deadlock in > > can't find the dup bug > > > process_measurement (4) Stupid line wrapping, let's try again ... #syz dup: possible deadlock in 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/20240928065620.7abadb2d8552f03d785c= 77c9@linux-foundation.org/ > >> [1] > >> Link: https://lore.kernel.org/all/20240928180044.50-1-ebpqwerty472123@= gmail.com/ > >> [2] --=20 paul-moore.com