From nobody Fri Dec 26 11:47:35 2025 Received: from smtp-relay-internal-1.canonical.com (smtp-relay-internal-1.canonical.com [185.125.188.123]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1549418BB8B for ; Tue, 3 Sep 2024 15:16:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.125.188.123 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725376621; cv=none; b=BiRxEI53s2+zmc/MBmVJwhHPZLyZC4nBGISirb+qFW8xBsQbMcZRxH1BwujVFQoY2kXi2TzwXd8OrqoIM6nQSxTHZN7DyorMGG+awOKQ29qYA912jS6v8sM8lmASgb/jMGSu+OVn61DbdDDpdZ5OrWxL8LbW66cMj1XZpuH5gJo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725376621; c=relaxed/simple; bh=+0zwTUGo6+RzPqyLPLoGhao9V7bGVcfHhuOQ58510LE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=er858B00057PCf+9Q8T1BAU4DIoVDjvBx3LqWfZGK9N/8UXYkN1k4OJ48HQU5TaxJaHy6PrsIfq+PIG6HnzdpAkFphhEoiH6jRot+oOaY8izlGOpdD+ZBg2Ek9Y+0B6Yp4c95Us9j4C5lRWTIpTX9Lg2jU+ku81W/YDQle5FKfE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=canonical.com; spf=pass smtp.mailfrom=canonical.com; dkim=pass (2048-bit key) header.d=canonical.com header.i=@canonical.com header.b=g+ofcIm+; arc=none smtp.client-ip=185.125.188.123 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=canonical.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=canonical.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=canonical.com header.i=@canonical.com header.b="g+ofcIm+" Received: from mail-ej1-f71.google.com (mail-ej1-f71.google.com [209.85.218.71]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-internal-1.canonical.com (Postfix) with ESMTPS id 031853F327 for ; Tue, 3 Sep 2024 15:16:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1725376616; bh=JC0kbEJjIhY7PwaINGFTAAblNYwex3Ap6OFdo5D4DqU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=g+ofcIm+rqDR6dWLcimaW9z0m2Ifg9eK0bJtFN2JHnGERtxRkruqxNfejY80PyShu oxseGvVNdE530qtdnGTlWe/oD4bR9w32Dxw3ftgptwWYrJyfYB6ILOuSdEqOPmudsM WCvd1t7M0Nv/niZXSLwUJ/2CKKffWVSE31HB86MniORNWIfp8ZCd8lyQRYLjTCDLS+ sUSIZeWl1zTeElmaGkgDkE0JUz/MWleR2NVuaUAs9JARzTz2UHfli2LyJwkXXpzwlJ B0XWtF/P1U4p59sLgA8e/16rD5Gkzj5d+qE1GAz1Va1GUH5naG+cDiN7AMwvwXUhZu o6DDCK0ssBVNg== Received: by mail-ej1-f71.google.com with SMTP id a640c23a62f3a-a7d2d414949so456741166b.0 for ; Tue, 03 Sep 2024 08:16:56 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725376615; x=1725981415; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=JC0kbEJjIhY7PwaINGFTAAblNYwex3Ap6OFdo5D4DqU=; b=ACRcdYoiegoPULIfZ4//1WcwJyp1ZeSl1FlEOUIK9eOoPpnnYWIbCznzJ/szCoG3Kd 7UZRzfuKWugddZesXIsbeE6ir5syO+6STY+2qELxIi8ywIQvbicEkeK3KuDobPHzKjvs EcUQ36g6pzpLHt7SjobhJr8p2BglDEjuzlEi32WUE/wQAqgeewRAjIIisuCNlqjBR4Of e12VV/zEClV31g2+ZP1LwpmN5TTkWnii+5ILUOznldNz4dKNlRVBGNhHgaiAlHvCHVmR ONgYhfjEYEppnuMlBq/iCFF7TnelqKb8+CbE2GmSkXvgZx1RPXmLTiaZFIGNZDg7NCRs UGdg== X-Forwarded-Encrypted: i=1; AJvYcCVlvOeFUxvYT63KA4yEEjHXEP60FqVJeFi2DHofrMhaia6A3CLhzLUZfKZAXfMTzYVQUKPdbLY/yUPx5A8=@vger.kernel.org X-Gm-Message-State: AOJu0YyzRwO/r1YKEGM8/1jiZLjZvZem8f7YQ6COhYvGbs0BAmzCb43s zsZCT1xfa30o+CMG9fGXkSg6M0Azx3ikruVJCw1pNjqk6g9Tts+W0OTvZj3tmCyMb79xPRS6Z1z KLpbUUprYQus777Zc6Z0MVxi6eGoFx61OOXtJZpCPZSrr2W8mmD1FLxABBGdD/jSlDj83GyXX8l VGcg== X-Received: by 2002:a17:907:7f22:b0:a7a:8586:d36b with SMTP id a640c23a62f3a-a8a32df201amr77098166b.3.1725376615501; Tue, 03 Sep 2024 08:16:55 -0700 (PDT) X-Google-Smtp-Source: AGHT+IF6yFu1Bsw3W/nZaOc47kv/qKH1mcQ+bQ3WmyZBHT/KsKGUKlObSlloDjZT275IsdiJSzRa3A== X-Received: by 2002:a17:907:7f22:b0:a7a:8586:d36b with SMTP id a640c23a62f3a-a8a32df201amr77095866b.3.1725376614995; Tue, 03 Sep 2024 08:16:54 -0700 (PDT) Received: from amikhalitsyn.. ([188.192.113.77]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a8a19afb108sm156377166b.223.2024.09.03.08.16.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Sep 2024 08:16:54 -0700 (PDT) From: Alexander Mikhalitsyn To: mszeredi@redhat.com Cc: brauner@kernel.org, stgraber@stgraber.org, linux-fsdevel@vger.kernel.org, Seth Forshee , Miklos Szeredi , Amir Goldstein , Bernd Schubert , Alexander Mikhalitsyn , linux-kernel@vger.kernel.org Subject: [PATCH v4 04/15] fs/fuse: support idmapped FUSE_EXT_GROUPS Date: Tue, 3 Sep 2024 17:16:15 +0200 Message-Id: <20240903151626.264609-5-aleksandr.mikhalitsyn@canonical.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240903151626.264609-1-aleksandr.mikhalitsyn@canonical.com> References: <20240903151626.264609-1-aleksandr.mikhalitsyn@canonical.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" We don't need to remap parent_gid, but have to adjust group membership checks and take idmapping into account. Cc: Christian Brauner Cc: Seth Forshee Cc: Miklos Szeredi Cc: Amir Goldstein Cc: Bernd Schubert Cc: Signed-off-by: Alexander Mikhalitsyn --- v4: - this commit added --- fs/fuse/dir.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 2a8344776350..b0b57f383889 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -545,17 +545,21 @@ static u32 fuse_ext_size(size_t size) /* * This adds just a single supplementary group that matches the parent's g= roup. */ -static int get_create_supp_group(struct inode *dir, struct fuse_in_arg *ex= t) +static int get_create_supp_group(struct mnt_idmap *idmap, + struct inode *dir, + struct fuse_in_arg *ext) { struct fuse_conn *fc =3D get_fuse_conn(dir); struct fuse_ext_header *xh; struct fuse_supp_groups *sg; kgid_t kgid =3D dir->i_gid; + vfsgid_t vfsgid =3D make_vfsgid(idmap, fc->user_ns, kgid); gid_t parent_gid =3D from_kgid(fc->user_ns, kgid); + u32 sg_len =3D fuse_ext_size(sizeof(*sg) + sizeof(sg->groups[0])); =20 - if (parent_gid =3D=3D (gid_t) -1 || gid_eq(kgid, current_fsgid()) || - !in_group_p(kgid)) + if (parent_gid =3D=3D (gid_t) -1 || vfsgid_eq_kgid(vfsgid, current_fsgid(= )) || + !vfsgid_in_group_p(vfsgid)) return 0; =20 xh =3D extend_arg(ext, sg_len); @@ -572,7 +576,8 @@ static int get_create_supp_group(struct inode *dir, str= uct fuse_in_arg *ext) return 0; } =20 -static int get_create_ext(struct fuse_args *args, +static int get_create_ext(struct mnt_idmap *idmap, + struct fuse_args *args, struct inode *dir, struct dentry *dentry, umode_t mode) { @@ -583,7 +588,7 @@ static int get_create_ext(struct fuse_args *args, if (fc->init_security) err =3D get_security_context(dentry, mode, &ext); if (!err && fc->create_supp_group) - err =3D get_create_supp_group(dir, &ext); + err =3D get_create_supp_group(idmap, dir, &ext); =20 if (!err && ext.size) { WARN_ON(args->in_numargs >=3D ARRAY_SIZE(args->in_args)); @@ -668,7 +673,7 @@ static int fuse_create_open(struct inode *dir, struct d= entry *entry, args.out_args[1].size =3D sizeof(*outopenp); args.out_args[1].value =3D outopenp; =20 - err =3D get_create_ext(&args, dir, entry, mode); + err =3D get_create_ext(&nop_mnt_idmap, &args, dir, entry, mode); if (err) goto out_put_forget_req; =20 @@ -798,7 +803,7 @@ static int create_new_entry(struct fuse_mount *fm, stru= ct fuse_args *args, args->out_args[0].value =3D &outarg; =20 if (args->opcode !=3D FUSE_LINK) { - err =3D get_create_ext(args, dir, entry, mode); + err =3D get_create_ext(&nop_mnt_idmap, args, dir, entry, mode); if (err) goto out_put_forget_req; } --=20 2.34.1