Re: [libvirt] [PATCH] Ensure root filesystem is recursively mounted readonly

From: "Daniel P. Berrange" <berrange(a)redhat.com&gt; If the guest is configured with <filesystem type='mount'> <source dir='/'/> <target dir='/'/> <readonly/> </filesystem> Then any submounts under / should also end up readonly. eg if the user has /home on a separate volume, they'd expect /home to be readonly. Users can selectively make sub-mounts read-write again by simply listing them as new mounts without the <readonly> flag set <filesystem type='mount'> <source dir='/home'/> <target dir='/home'/> </filesystem> Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com&gt; --- src/lxc/lxc_container.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 73 insertions(+), 2 deletions(-)

+ while (getmntent_r(procmnt, &mntent, mntbuf, sizeof(mntbuf)) != NULL) { + if (STREQ(mntent.mnt_dir, "/") || + STRPREFIX(mntent.mnt_dir, "/.oldroot"))

+ continue; + + if (VIR_REALLOC_N(mounts, nmounts+1) < 0)

+ + for (i = 0 ; i < nmounts ; i++) {