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[80.187.86.54]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c5095b3dbaesm74933966b.32.2026.11.13.02.03.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Nov 2026 02:03:07 -0800 (PST) Message-ID: Subject: Re: [PATCH RFC 07/41] binfmt_misc: use fc_init_pseudo() From: Alexander Mikhalitsyn To: Christian Brauner , linux-fsdevel@vger.kernel.org Cc: Jann Horn , Chris Mason , Josef Bacik , Christoph Hellwig , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, Alexander Viro , Jan Kara , linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, driver-core@lists.linux.dev, linux-mm@kvack.org, bpf@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, apparmor@lists.ubuntu.com, linux-nfs@vger.kernel.org, netdev@vger.kernel.org, fuse-devel@lists.linux.dev, linux-efi@vger.kernel.org, xen-devel@lists.xenproject.org, ocfs2-devel@lists.linux.dev, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-usb@vger.kernel.org, Amir Goldstein , linux-erofs@lists.ozlabs.org, linux-kselftest@vger.kernel.org Date: Fri, 13 Nov 2026 11:03:05 +0100 In-Reply-To: <20261110-work-loop-pseudo-v1-7-4c998976c6c7@kernel.org> References: <20261110-work-loop-pseudo-v1-0-4c998976c6c7@kernel.org> <20261110-work-loop-pseudo-v1-7-4c998976c6c7@kernel.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2-0+deb13u1 X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 On Tue, 2026-11-10 at 10:14 +0100, Christian Brauner wrote: > Initialize binfmt_misc as a pseudo filesystem instead of raising > SB_I_NOEXEC and SB_I_NODEV by hand. This adds SB_I_PSEUDO. >=20 > Signed-off-by: Christian Brauner (Amutable) Reviewed-by: Alexander Mikhalitsyn > --- > =C2=A0fs/binfmt_misc.c | 5 +++-- > =C2=A01 file changed, 3 insertions(+), 2 deletions(-) >=20 > diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c > index d945b4f6e158..7dc233becd98 100644 > --- a/fs/binfmt_misc.c > +++ b/fs/binfmt_misc.c > @@ -22,6 +22,7 @@ > =C2=A0#include > =C2=A0#include > =C2=A0#include > +#include > =C2=A0#include > =C2=A0#include > =C2=A0#include > @@ -1575,8 +1576,7 @@ static int bm_fill_super(struct super_block > *sb, struct fs_context *fc) > =C2=A0 if (user_ns !=3D current_user_ns()) > =C2=A0 return -EINVAL; > =C2=A0 > - /* Never exec off this instance and never let anything stack > on it. */ > - sb->s_iflags |=3D SB_I_NOEXEC | SB_I_NODEV; > + /* Never let anything stack on this instance. */ > =C2=A0 sb->s_stack_depth =3D FILESYSTEM_MAX_STACK_DEPTH; > =C2=A0 > =C2=A0 /* > @@ -1660,6 +1660,7 @@ static void bm_kill_sb(struct super_block *sb) > =C2=A0 > =C2=A0static int bm_init_fs_context(struct fs_context *fc) > =C2=A0{ > + fc_init_pseudo(fc); > =C2=A0 fc->ops =3D &bm_context_ops; > =C2=A0 return 0; > =C2=A0}