From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794302206; b=PzHYtQcIZ5ezIgnW/O4dRaZF81UmZOT3bMGRA7uloOXLdVminaauZlRv9tChMZKylEkt GV2aAelj3fnRk1BCLBwatOZezccOVKfyih9s5eC6Kay/6P8irgcCpBMgjEJYDVHco6pJ+ En8byPHrXr375qMTayVQVP+TYceEIBhXlBHlhVLpi1dGVt2/XvJMUeG82D8zrYRskLnsf V5YWDcep6kEU8ZU7zjFKnAPTqC1hVJckzvRrh8AWYIG1q0FUWW1ccCkN2e42KDNzBoenQ sxmCB9RY13bx2fY2Cw+TTSAfM2vKJXpVeIu2nYBrB4Drij+jRj50CCV4hvHZNwkdTfg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794302206; h=Received:DKIM-Signature:From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:References:In-Reply-To:To:Cc: X-Mailer:X-Developer-Signature:X-Developer-Key; bh=6iLMVu7/iMBDJai9Frtaq88BtgFpmQIL1GiZqP6G3sI=; b=FIPhEGN7bPAhjfqYq3VjgrSjWOZtXsJRqckNbFQI2bztXHSP0qP80vdgzYPsBy4LWdBd jWcVxIxv6LHi6qmYghMLXCk92wmHwFNr0+S+lpO9x+/RKpdJWUW6DfENKuw2dpeA4UjKO u9SeYf0ngePwCeF3j1C5LQ3EX6NjvYeZ33snETFtORd0yfP+Fl/LuUSH5qaQAYtvQjs+g dotAsP3ToXMkvLjn8NIeG6FCEeBJLiG6H5ky0hJpGrjhkFY/wslmNlYWEIyqqUfBjB0cP t1RNjSpEgX5rzfjpMjxLsSpK45dRBUc9qkejttSNkw59v4hYhvYB6Em52zwPanSyXXA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b="PK/1xJP3"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A81A3606B9C6; Tue, 10 Nov 2026 09:16:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=PK/1xJP3 Received: by smtp.kernel.org (Postfix) with ESMTPSA id E40961F008A5; Tue, 10 Nov 2026 09:16:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794302205; bh=6iLMVu7/iMBDJai9Frtaq88BtgFpmQIL1GiZqP6G3sI=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=PK/1xJP3LiuE+nt9clqn6XzH1ykuCvGLk3pJedYJU7MenGMVki1YReFMeqHc2zbsn f172wPMgNRu0JWSTlIgtjrHD4rRAL5eo4520JocrDxATE3L3QlkqPhQ9KQk+e2lr0U Z36S4rtp/Z53gBsFmJhmg4BkAtm0NXKKNbbu/pQH5R9bFuSUNl6MT1vw2mzIJB+cHB GEBOatAxu+reiIAHlIkDGmUecEYVk7FAdx3uXRaXJYFCUAdz3m+wvz8PXNcaKaCVki JtIsqDglq1gfmT2kaiK580I9+CfdeeDheRHydlXbZS6YOU+oHBKlCiswiLTGKFt073 cI6f92QGFv0dg== From: Christian Brauner Date: Tue, 10 Nov 2026 10:14:23 +0100 Subject: [PATCH RFC 07/41] binfmt_misc: use fc_init_pseudo() X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261110-work-loop-pseudo-v1-7-4c998976c6c7@kernel.org> References: <20261110-work-loop-pseudo-v1-0-4c998976c6c7@kernel.org> In-Reply-To: <20261110-work-loop-pseudo-v1-0-4c998976c6c7@kernel.org> To: 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, "Christian Brauner (Amutable)" X-Mailer: b4 0.17-dev-ce4c1 X-Developer-Signature: v=1; a=openpgp-sha256; l=1237; i=brauner@kernel.org; h=from:subject:message-id; bh=UVUPWAqqIx2djk703y1XHtcvgboItkTJfb/9RmtQVkY=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWR9ejBn84pzm65G6TrPnLRrvZZh1ewlwVPObmlaECUjK 7ZLaeoizY5SFgYxLgZZMUUWh3aTcLnlPBWbjTI1YOawMoEMYeDiFICJ/NJl+MPnlu8e4KGSGHCt mDNIumRG+SSJIzc+6bMINy6T/Wpmeo6R4ej/ewWKW0xWbLL7tadJ5iOL4pbdcy4cKXfp5/DfHPj 1KQ8A X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Initialize binfmt_misc as a pseudo filesystem instead of raising SB_I_NOEXEC and SB_I_NODEV by hand. This adds SB_I_PSEUDO. Signed-off-by: Christian Brauner (Amutable) --- fs/binfmt_misc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) 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 @@ #include #include #include +#include #include #include #include @@ -1575,8 +1576,7 @@ static int bm_fill_super(struct super_block *sb, struct fs_context *fc) if (user_ns != current_user_ns()) return -EINVAL; - /* Never exec off this instance and never let anything stack on it. */ - sb->s_iflags |= SB_I_NOEXEC | SB_I_NODEV; + /* Never let anything stack on this instance. */ sb->s_stack_depth = FILESYSTEM_MAX_STACK_DEPTH; /* @@ -1660,6 +1660,7 @@ static void bm_kill_sb(struct super_block *sb) static int bm_init_fs_context(struct fs_context *fc) { + fc_init_pseudo(fc); fc->ops = &bm_context_ops; return 0; } -- 2.53.0