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=1794302905; b=KeVCqZHsU8xhvDZ7igVjjrFImJZ1bYjZJ+2nKv3oOGH+o+/twz0DxpCXvCa0Y3YzsVh9 xN2hiABob532VqgpBDfsR5EgvbrfqAO1/RUpWc2ebL71pLyULYM4KEbikhyRuXKjBs8bg fwElTCPRaF/gCaXHsEldi3Xr6N52nBKMWKnrpb29Y8HkRsv/hjP3KUjVg/HyRPpTGxmAs 2Got8VIf1IbxRcK4ljz6ky8eVjoIaTY+sy9S3euJPG5Gqg6NvtFn4RrlyCmsv0Td9M1OR qLHIFwpEtsEC2nJ3oLigRBY/GWnG6qNuT9Dom4EmI5XtlzBFqcd3f33QmUZYw/xwREg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794302905; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To:Cc: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=EDrlvOH4AE4zsttPGp/kzS6ad6ZLk+AeJ4+9Gxp5Kmo=; b=TkD5I6L3W2ivyBHtg9obR5y6LUlekspBQBzDfBgIKsRT3a2TQcO/1piqJKhsH6aIFliX xHgAIKEe1FjtCXMUHvUUOYD96hvvFu1dej4xH4IALiKJPo4BG/oIr4OCbrjrsoYXaof7c sGf1Rtud31vmcwChB+sa6mSj7nHyuXIyV5d4vUypgbaN0eImnKRcDhB+N3EnaTR21U3B1 /ba8FcF9QsemxEZuh7/5YZCuz0YVVFKI00bOvm2gYGzY/QCXlyAYWdTmzSQy+mskxhqJG NfkJklIO+y0mIaPUrs/fBbXiwWknFAJAMdIMtQ+4tZEvfJbpFbDszGht+cYVhn9LxGA== 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=Sctq63gJ; 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 6AB58606B9F9; Tue, 10 Nov 2026 09:28:25 +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=Sctq63gJ Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56C4E1F0089F; Tue, 10 Nov 2026 09:28:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794302904; bh=EDrlvOH4AE4zsttPGp/kzS6ad6ZLk+AeJ4+9Gxp5Kmo=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=Sctq63gJLeG4Ak2036PbsYvZvxDtT9WlF7LEy2ZjiTlvbxuK/ol2theMrNFB+cgWy 02TBnWkJ/TXbG028ubnzI9tPpbfk2b4usJtIY2w84hfBx2K2Ghl0myNXlyaqT2YAFP W7ihv4RZ57ERAtWbFD3xcVFR/rd7rpGdX+VCONuuiOmNv8Vx8Ajrh0vX9TSBYtSw2h KKT7BlMv7CtXsZTnaUVVJ7Rr/MMsLX7didtJvZFDlbW8RkiVVrtlPenlKermqBWaL1 /3n+5tsYoO5DNBuZh9pnwnaV7dmPkeuhxg5r0fhKadySGohnMkCJGmeVZefKb/xHlD mjT0hi7yQz6KQ== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH RFC 38/41] fuse: refuse files on pseudo filesystems as passthrough backing files Reply-To: sashiko-reviews@lists.linux.dev To: "Christian Brauner" Cc: linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-s390@vger.kernel.org, linux-usb@vger.kernel.org, "Heiko Carstens" , "Vasily Gorbik" , "Alexander Gordeev" , "Christian Borntraeger" , "Mark Fasheh" , "Joel Becker" , "Joseph Qi" In-Reply-To: <20261110-work-loop-pseudo-v1-38-4c998976c6c7@kernel.org> References: <20261110-work-loop-pseudo-v1-0-4c998976c6c7@kernel.org> <20261110-work-loop-pseudo-v1-38-4c998976c6c7@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Tue, 10 Nov 2026 09:28:23 +0000 X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list > The fuse server can register any regular file as a backing file. procfs > and binfmt_misc files are already refused by the stacking depth check as > both set s_stack_depth to FILESYSTEM_MAX_STACK_DEPTH. sysfs and the > other pseudo filesystems aren't. Reads and writes of the fuse file would > then be done on the pseudo file with the fuse server's credentials. > Refuse files on pseudo filesystems just like loop does. >=20 > Signed-off-by: Christian Brauner (Amutable) Sashiko has reviewed this patch and found no issues. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261110-work-loop-= pseudo-v1-0-4c998976c6c7@kernel.org?part=3D38