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From 41d442c08990becc8adac8b6eede016a381d21ec Mon Sep 17 00:00:00 2001
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Message-Id: <41d442c08990becc8adac8b6eede016a381d21ec@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Mon, 11 May 2020 16:40:12 +0200
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Subject: [PATCH] virDevMapperGetTargetsImpl: quit early if device is not a
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devmapper target
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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As suggested in the linked bug, libvirt should firstly check
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whether the major number of the device is device mapper major.
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Because if it isn't subsequent DM_DEVICE_DEPS task may not only
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fail, but also yield different results. In the bugzilla this is
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demonstrated by creating a devmapper target named 'loop0' and
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then creating loop target /dev/loop0. When the latter is then
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passed to a domain, our virDevMapperGetTargetsImpl() function
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blindly asks devmapper to provide target dependencies for
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/dev/loop0 and because of the way devmapper APIs work, it will
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'sanitize' the input by using the last component only which is
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'loop0' and thus return different results than expected.
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Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1823976
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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(cherry picked from commit 01626c668ecfbe465d18799ac4628e6127ea1d47)
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Message-Id: <a3bc79b319dae9f6b4e6813399f2e5dc0ec077df.1589207928.git.mprivozn@redhat.com>
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Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/util/virdevmapper.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/src/util/virdevmapper.c b/src/util/virdevmapper.c
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index 7da0dba911..a360c3e677 100644
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--- a/src/util/virdevmapper.c
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+++ b/src/util/virdevmapper.c
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@@ -69,6 +69,7 @@ virDevMapperGetTargetsImpl(const char *path,
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char ***devPaths_ret,
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unsigned int ttl)
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{
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+ struct stat sb;
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struct dm_task *dmt = NULL;
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struct dm_deps *deps;
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struct dm_info info;
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@@ -87,6 +88,15 @@ virDevMapperGetTargetsImpl(const char *path,
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return ret;
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}
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+ if (stat(path, &sb) < 0) {
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+ if (errno == ENOENT)
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+ return 0;
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+ return -1;
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+ }
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+
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+ if (!dm_is_dm_major(major(sb.st_dev)))
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+ return 0;
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+
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if (!(dmt = dm_task_create(DM_DEVICE_DEPS))) {
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if (errno == ENOENT || errno == ENODEV) {
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/* It's okay. Kernel is probably built without
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--
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2.26.2
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