From nobody Tue May 14 09:56:16 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1683140602; cv=none; d=zohomail.com; s=zohoarc; b=YpzYQbZBeiNLW6O/imX7Akh0BAWKzwvEdKcsM5f3vUiNqs27Sb34eLfMk00b61kVhhELCwgQMvZQe7ay3B06bhqWX2VgxicqxKLCiRXPE/J91sNiJNBmt2Qn0ENmKgY6OX+0LRS90N3qgVqSQrkcwTuxvAIFGj7ujCbNzo8n8N8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1683140602; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=5drMnwCth7rxuSJPqx4SwAVCfRpz8mWFhYUcdoOB1m0=; b=JMI2zYGqhpw8ih54XLGChiGFKZ4rSFEToseDfdJu/wAo0ybEsOz22DXifEMWYZbRlu2fJWEQ79btNGEBoCbd5H9gKMxsyqy7BF+rXERYMPPY9as9VEXaQBypXLm67g5pd5BvHSlLYXnHXqNC2MU7ljSCmfiP5ExRp/XxBAWd4/I= ARC-Authentication-Results: i=1; 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bh=5drMnwCth7rxuSJPqx4SwAVCfRpz8mWFhYUcdoOB1m0=; b=LZ4suq0HC5DNb2Ydj65x+v64f9v+AFCJ6aVQe6zo14sNT+6/yRfQ5mDToSRZsBD91SIQju rkHhlzPsJpn3GJe5TM7y7ObUmT1/vsMXqIU6H3w8M212iqhHkqXI6Hv8ryuqjja6F2gR44 ePzqjBoxAatTrh0PPAinj9GE+phYkL4= X-MC-Unique: vioEeJxUOiix2AsVZgyjqQ-1 From: Eric Blake To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= Subject: [PULL 1/2] systemd: Also clear LISTEN_FDNAMES during systemd socket activation Date: Wed, 3 May 2023 14:02:31 -0500 Message-Id: <20230503190232.362022-2-eblake@redhat.com> In-Reply-To: <20230503190232.362022-1-eblake@redhat.com> References: <20230503190232.362022-1-eblake@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.161, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1683140603027100001 Some time after systemd documented LISTEN_PID and LISTEN_FDS for socket activation, they later added LISTEN_FDNAMES; now documented at: https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html In particular, look at the implementation of sd_listen_fds_with_names(): https://github.com/systemd/systemd/blob/main/src/libsystemd/sd-daemon/sd-da= emon.c If we ever pass LISTEN_PID=3Dxxx and LISTEN_FDS=3Dn to a child process, but leave LISTEN_FDNAMES=3D... unchanged as inherited from our parent process, then our child process using sd_listen_fds_with_names() might see a mismatch in the number of names (unexpected -EINVAL failure), or even if the number of names matches the values of those names may be unexpected (with even less predictable results). Usually, this is not an issue - the point of LISTEN_PID is to tell systemd socket activation to ignore all other LISTEN_* if they were not directed to this particular pid. But if we end up consuming a socket directed to this qemu process, and later decide to spawn a child process that also needs systemd socket activation, we must ensure we are not leaking any stale systemd variables through to that child. The easiest way to do this is to wipe ALL LISTEN_* variables at the time we consume a socket, even if we do not yet care about a LISTEN_FDNAMES passed in from the parent process. See also https://lists.freedesktop.org/archives/systemd-devel/2023-March/04= 8920.html Thanks: Laszlo Ersek Signed-off-by: Eric Blake Message-Id: <20230324153349.1123774-1-eblake@redhat.com> Reviewed-by: Daniel P. Berrang=C3=A9 --- util/systemd.c | 1 + 1 file changed, 1 insertion(+) diff --git a/util/systemd.c b/util/systemd.c index 5bcac9b4016..ced518f771b 100644 --- a/util/systemd.c +++ b/util/systemd.c @@ -51,6 +51,7 @@ unsigned int check_socket_activation(void) /* So these are not passed to any child processes we might start. */ unsetenv("LISTEN_FDS"); unsetenv("LISTEN_PID"); + unsetenv("LISTEN_FDNAMES"); /* So the file descriptors don't leak into child processes. */ for (i =3D 0; i < nr_fds; ++i) { --=20 2.40.1 From nobody Tue May 14 09:56:16 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1683140606; cv=none; d=zohomail.com; s=zohoarc; b=ekmMi2XcxlLz0DrTsm+F86wlhu6yq8pkgrYcHgi8JPkxHXMhHQJERahJz1aFurP5CMD/8e7gRFa4DEPGQzlErwVhfC1jz21Efo8ccvAFkbUfnNM2Bm37VFzYTH1wMspu+cs9DvukGx+9T9YG0bE+Lnr3wI/qZLRn5l7BoWeIvZE= ARC-Message-Signature: i=1; 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Wed, 3 May 2023 19:02:36 +0000 (UTC) Received: from green.redhat.com (unknown [10.2.16.118]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6698A1410F2A; Wed, 3 May 2023 19:02:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1683140559; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+IHGxrm/Xp0lBQuQRwa1E6vZgFCzDQjnRyAKec7RbHk=; b=LO2YxD5oLWzwue5KOiofswXktxNQTEM/JEDtjiyPGIIYkvY5rxxHLgpZzwPuu/bqqGItn4 IIx1E5Hm0nYxEGrywFKH/KnrcmxxXoEZ7VzELa9bYwAssQuSjuwuBGkRq5bJOuGnYmsXnY 6uip262ODdEmQoX/jWf1fCHtWXTCgw8= X-MC-Unique: _CsLVcBANFGSeA6tRlnRHw-1 From: Eric Blake To: qemu-devel@nongnu.org Cc: Stefan Hajnoczi , Kevin Wolf , Hanna Reitz , Xie Yongji , qemu-block@nongnu.org (open list:Block layer core) Subject: [PULL 2/2] block/export: call blk_set_dev_ops(blk, NULL, NULL) Date: Wed, 3 May 2023 14:02:32 -0500 Message-Id: <20230503190232.362022-3-eblake@redhat.com> In-Reply-To: <20230503190232.362022-1-eblake@redhat.com> References: <20230503190232.362022-1-eblake@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.161, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1683140607125100001 Content-Type: text/plain; charset="utf-8" From: Stefan Hajnoczi Most export types install BlockDeviceOps pointers. It is easy to forget to remove them because that happens automatically via the "drive" qdev property in hw/ but not block/export/. Put blk_set_dev_ops(blk, NULL, NULL) calls in the core export.c code so the export types don't need to remember. This fixes the nbd and vhost-user-blk export types. Fixes: fd6afc501a01 ("nbd/server: Use drained block ops to quiesce the serv= er") Fixes: ca858a5fe94c ("vhost-user-blk-server: notify client about disk resiz= e") Signed-off-by: Stefan Hajnoczi Reviewed-by: Eric Blake Message-Id: <20230502211119.720647-1-stefanha@redhat.com> Signed-off-by: Eric Blake --- block/export/export.c | 2 ++ block/export/vduse-blk.c | 1 - 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/block/export/export.c b/block/export/export.c index e3fee606116..62c7c22d45d 100644 --- a/block/export/export.c +++ b/block/export/export.c @@ -192,6 +192,7 @@ BlockExport *blk_exp_add(BlockExportOptions *export, Er= ror **errp) return exp; fail: + blk_set_dev_ops(exp->blk, NULL, NULL); blk_unref(blk); aio_context_release(ctx); if (exp) { @@ -219,6 +220,7 @@ static void blk_exp_delete_bh(void *opaque) assert(exp->refcount =3D=3D 0); QLIST_REMOVE(exp, next); exp->drv->delete(exp); + blk_set_dev_ops(exp->blk, NULL, NULL); blk_unref(exp->blk); qapi_event_send_block_export_deleted(exp->id); g_free(exp->id); diff --git a/block/export/vduse-blk.c b/block/export/vduse-blk.c index f7ae44e3cea..b53ef39da02 100644 --- a/block/export/vduse-blk.c +++ b/block/export/vduse-blk.c @@ -346,7 +346,6 @@ static void vduse_blk_exp_delete(BlockExport *exp) blk_remove_aio_context_notifier(exp->blk, blk_aio_attached, blk_aio_de= tach, vblk_exp); - blk_set_dev_ops(exp->blk, NULL, NULL); ret =3D vduse_dev_destroy(vblk_exp->dev); if (ret !=3D -EBUSY) { unlink(vblk_exp->recon_file); --=20 2.40.1