4:10 a.m.
See path 2 for detail.
Peng Liang (2):
qemu: move temp file of screenshot and memorypeek to autoDumpPath
qemu: don't change ownership of cache directory
src/qemu/qemu_driver.c | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)
--
2.31.1
4:10 a.m.
New subject: [PATCH 1/2] qemu: move temp file of screenshot and memorypeek to autoDumpPath
Signed-off-by: Peng Liang <liangpeng10(a)huawei.com>
---
src/qemu/qemu_driver.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index dfc27572c461..e929e950e848 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -3431,7 +3431,7 @@ qemuDomainScreenshot(virDomainPtr dom,
}
}
- tmp = g_strdup_printf("%s/qemu.screendump.XXXXXX", cfg->cacheDir);
+ tmp = g_strdup_printf("%s/qemu.screendump.XXXXXX", cfg->autoDumpPath);
if ((tmp_fd = g_mkstemp_full(tmp, O_RDWR | O_CLOEXEC, S_IRUSR | S_IWUSR)) == -1) {
virReportSystemError(errno, _("g_mkstemp(\"%s\") failed"),
tmp);
@@ -10692,7 +10692,7 @@ qemuDomainMemoryPeek(virDomainPtr dom,
if (virDomainObjCheckActive(vm) < 0)
goto endjob;
- tmp = g_strdup_printf("%s/qemu.mem.XXXXXX", cfg->cacheDir);
+ tmp = g_strdup_printf("%s/qemu.mem.XXXXXX", cfg->autoDumpPath);
/* Create a temporary filename. */
if ((fd = g_mkstemp_full(tmp, O_RDWR | O_CLOEXEC, S_IRUSR | S_IWUSR)) == -1) {
--
2.31.1
10:07 a.m.
New subject: [PATCH 1/2] qemu: move temp file of screenshot and memorypeek to autoDumpPath
On Mon, Sep 13, 2021 at 10:10:58 +0800, Peng Liang wrote:
Please elaborate in the commit message why you are making this change.
Signed-off-by: Peng Liang <liangpeng10(a)huawei.com>
---
src/qemu/qemu_driver.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
4:10 a.m.
New subject: [PATCH 2/2] qemu: don't change ownership of cache directory
Commit 6bcf25017bc6 ("virDomainMemoryPeek API") introduced memory peek
and commit 9936aecfd1b4 ("qemu: Implement the driver methods")
introduced screenshot. Both of them will put temporary files in
/var/cache/libvirt/qemu, and the temporary files are created by QEMU.
Therefore, the ownership of /var/cache/libvirt/qemu should be changed to
user and group configured in qemu.conf to make sure that QEMU process
can create and write files in the cache directory.
Libvirt will only put the temporary files in /var/cache/libvirt/qemu
until commit cbde35899b90 ("Cache result of QEMU capabilities
extraction"), which will put the cache of QEMU capabilities in
'capabilities' subdir of the cache directory. Because the capabilities
is used by libvirt, the ownership of both 'capabilities' subdir and
capabilitie files are root. However, when QEMU process runs as a
regular user (e.g. qemu user), the ownership of /var/cache/libvirt/qemu
will be changed to qemu:qemu while that of
/var/cache/libvirt/qemu/capabilities will be still root:root. Then the
regular user could spoof different capabilities, which maybe lead to
denial of service.
Since the previous patch has move the temp files of screenshot and
memory peek to autoDumpPath, no one except domain capabilities uses
cacheDir currently. And since domain capabilities are used by libvirtd
instead of QEMU, no need to change the ownership of cacheDir explicitly.
Signed-off-by: Peng Liang <liangpeng10(a)huawei.com>
---
src/qemu/qemu_driver.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index e929e950e848..8a6fd5767893 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -748,13 +748,6 @@ qemuStateInitialize(bool privileged,
(int)cfg->group);
goto error;
}
- if (chown(cfg->cacheDir, cfg->user, cfg->group) < 0) {
- virReportSystemError(errno,
- _("unable to set ownership of '%s' to
%d:%d"),
- cfg->cacheDir, (int)cfg->user,
- (int)cfg->group);
- goto error;
- }
if (chown(cfg->saveDir, cfg->user, cfg->group) < 0) {
virReportSystemError(errno,
_("unable to set ownership of '%s' to
%d:%d"),
--
2.31.1
1103
days inactive
1103
days old
3 comments
2 participants
participants (2)
-
Peng Liang -
Peter Krempa