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=1793270674; b=HfdiCUTnpijQRZ9cIuwOc5hRtsFuSkgINXMedZZPoqLn3SOPn/8mrs82STVBS8QmATP3 NsLqPuVK8bwfLLDBGRM+HYIi+TA4dW5ZC9yGPiS0bFdCraB5S6W2QDrmPHMjZYXMiapXt dMgRbXDezZaHQZsQMJ6MpkQgI8RYb6QRabvR7688WvQoKc1j7A46rJ7lBTNtKCTW7BO8s jU4LUlvW6wdX4bjAQ3ALEEdh9u6D3YSJBq3nzhGSoBO/DAxI2wDBamyTGSNTX+/Ks7IHd dMXvwjLN6/hRhkKrO+1p0Pxj7onYOM7dSdYpDuNhCAQUDWc9BeJG9eYxgYPvhZ08TRw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793270674; 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=CIildARgeqLV5Iv54/CNVDjST3eNjwaUwngHh+RJ76o=; b=VN45YeDfHvmz9vUu12UIEBk+dMK81Li3sYot1I7wy2W6Zp6Ouz49hki/vL7wJj0QkpTK LyyYbWtMX+V0ulM5oM0kZCUUl3fldtGceaHj5q83JveU+NZpJBwL+/ZpIr+7ciLN5f9e6 bjbj6sBNK6TPr3nSAApuqYCy7J158uHtSAHSiNZD5UIcQrhi3laBgYxra+Ic18y19cveX Cx41ryfyA7BVLuIzl2BlQkOrPNpMYo9hRZhHC145kYePMXmMWwgkg8w8ugpwwbmqeohtQ XqJH1G4qbRu1K943zF3T2pUR5zSIzplYmpOprxdoCt8cFpbM9tqCdtIt2hvWodCPoCg== 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="AymbEKu/"; 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 669EF606A327; Thu, 29 Oct 2026 10:44:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=AymbEKu/ Received: by smtp.kernel.org (Postfix) with ESMTPSA id 389FA1F01829; Thu, 29 Oct 2026 10:44:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793270674; bh=CIildARgeqLV5Iv54/CNVDjST3eNjwaUwngHh+RJ76o=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=AymbEKu/+O141aUXpFJESQYbVO4wuogMwXREBpJyzaJheRuB65aNLVGtrzRJi/VzO bE12Z6UlB10PYRTAOQsztIYgWy1igjPI8jnJkQUFqkhfNjcGkRLc/D4M0E/19WjV6n tVVXtBWvT4dkmpHXwnASIfsL00nzHR4ibLjuHCsaVNf0altwI4qCEsWJiI/JQKl33B RAsvjWT5rIZbdLkRtMRjQjxHfpsffbTpfSX3msFksDMdn73OqZU5ASa81krExVd19G e8OOgox3sShxjxE5XSQ/H+Cm6KVp3M8+YK+FkxzAFtIfzRe9oPkJ2d6wTM9ftD0mY2 rr2XyAwxhd6Fw== From: "David Hildenbrand (Arm)" Date: Thu, 29 Oct 2026 11:43:26 +0100 Subject: [PATCH v4 05/15] hugetlbfs: enforce F_SEAL_EXEC in setattr 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: <20261029-fixes_shmem-v4-5-392fc715d8f6@kernel.org> References: <20261029-fixes_shmem-v4-0-392fc715d8f6@kernel.org> In-Reply-To: <20261029-fixes_shmem-v4-0-392fc715d8f6@kernel.org> To: Andrew Morton , Gregory Price , Zi Yan , Joshua Hahn , Rakie Kim , Ying Huang , Johannes Weiner , Vladimir Davydov , Michal Hocko , Hugh Dickins , Baolin Wang , Lukas Czerner , Carlos Maiolino , Christian Brauner , Jan Kara , Daniel Verkamp , Jeff Xu , Muchun Song , Oscar Salvador , David Stevens , "Matthew Wilcox (Oracle)" , William Kucharski , Chris Li , Kairui Song , Nhat Pham , Miaohe Lin , Naoya Horiguchi Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, "David Hildenbrand (Arm)" , Eva Kurchatova , stable@vger.kernel.org, Pedro Falcato , "Kiryl Shutsemau (Meta)" X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1864; i=david@kernel.org; h=from:subject:message-id; bh=VibnqfVc/i5QlUy5RzJlhfYS1+yzH9kwQCXwNrw3dIY=; b=owGbwMvMwCF2/OVpCdfQ3ZWMp9WSGLIeK4d5XZxZu/ixY/Xmvrs8OkxhqziUz4at10y7P+Xxy n+LpjSd6ShlYRDjYJAVU2QJCr5v8PLlutpqNz5mmDmsTCBDGLg4BWAit9gZ/mdfrP6WfvHudJHq LZmZi3s3NnV+WfV3wd3MQ5IXF17O+KfA8E836l/mJq3fSrmVGa+ay46uFNuunXbjprXDt0f5JVv /L2MHAA== X-Developer-Key: i=david@kernel.org; a=openpgp; fpr=1BD9CAAD735C4C3A460DFCCA4DDE10F700FF835A From: Eva Kurchatova F_SEAL_EXEC is enforced by shmem_setattr(), but hugetlbfs_setattr() does not check it. As a result, fchmod() can change the execute bits of a sealed hugetlbfs memfd. Use memfd_check_seals_mode() in hugetlbfs_setattr() to reject changes to execute bits when F_SEAL_EXEC is set. This also fixes the memfd_test hugetlbfs SEAL-EXEC subtest, where fchmod() incorrectly succeeded after applying F_SEAL_EXEC. Fixes: 6fd7353829ca ("mm/memfd: add F_SEAL_EXEC") Cc: stable@vger.kernel.org Signed-off-by: Eva Kurchatova Link: https://patch.msgid.link/20260629180247.2343229-1-eva.kurchatova@virtuozzo.com Acked-by: Pedro Falcato Acked-by: Kiryl Shutsemau (Meta) Acked-by: Zi Yan Tested-by: Gregory Price (Meta) Reviewed-by: Muchun Song [ david: use common helper; fixup Fixes:; check only regular files ] Signed-off-by: David Hildenbrand (Arm) --- fs/hugetlbfs/inode.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 01c4d6f44ebe..02e0a65d596d 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include #include @@ -840,6 +841,13 @@ static int hugetlbfs_setattr(const struct mnt_idmap *idmap, if (error) return error; + if (S_ISREG(inode->i_mode) && (ia_valid & ATTR_MODE)) { + error = memfd_check_seals_mode(info->seals, inode->i_mode, + attr->ia_mode); + if (error) + return error; + } + trace_hugetlbfs_setattr(inode, dentry, attr); if (ia_valid & ATTR_SIZE) { -- 2.43.0