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Merge pull request #2560 from brauner/2018-08-21/fix_fully_unprivileged_containers

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conf: fix devpts mounting when fully unprivileged
This commit is contained in:
Stéphane Graber 2018-08-21 10:53:57 -04:00 committed by GitHub
commit ac907950d8
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1 changed files with 28 additions and 22 deletions
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40
src/lxc/conf.c
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@ -1625,8 +1625,10 @@ static const struct id_map *find_mapped_nsid_entry(struct lxc_conf *conf,
static int lxc_setup_devpts(struct lxc_conf *conf)
{
int ret;
char default_devpts_mntopts[] = "gid=5,newinstance,ptmxmode=0666,mode=0620";
char **opts;
char devpts_mntopts[256];
char *mntopt_sets[5];
char default_devpts_mntopts[256] = "gid=5,newinstance,ptmxmode=0666,mode=0620";
if (conf->pty_max <= 0) {
DEBUG("No new devpts instance will be mounted since no pts "
@ -1652,29 +1654,33 @@ static int lxc_setup_devpts(struct lxc_conf *conf)
return -1;
}
/* gid=5 && max= */
mntopt_sets[0] = devpts_mntopts;
/* !gid=5 && max= */
mntopt_sets[1] = devpts_mntopts + sizeof("gid=5");
/* gid=5 && !max= */
mntopt_sets[2] = default_devpts_mntopts;
/* !gid=5 && !max= */
mntopt_sets[3] = default_devpts_mntopts + sizeof("gid=5");
/* end */
mntopt_sets[4] = NULL;
for (ret = -1, opts = mntopt_sets; opts && *opts; opts++) {
/* mount new devpts instance */
ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, devpts_mntopts);
if (ret < 0) {
/* try mounting without "max" */
if (errno == EINVAL) {
devpts_mntopts[sizeof(default_devpts_mntopts) - 1] = '\0';
ret = mount("devpts", "/dev/pts", "devpts",
MS_NOSUID | MS_NOEXEC, devpts_mntopts);
if (ret < 0) {
SYSERROR("Failed to mount new devpts instance");
return -1;
}
ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, *opts);
if (ret == 0)
break;
}
/* try mounting without gid=5 */
ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC,
devpts_mntopts + sizeof("gid=5"));
if (ret < 0) {
SYSERROR("Failed to mount new devpts instance");
return -1;
}
}
DEBUG("Mount new devpts instance with options \"%s\"", devpts_mntopts);
DEBUG("Mount new devpts instance with options \"%s\"", *opts);
/* Remove any pre-existing /dev/ptmx file. */
ret = remove("/dev/ptmx");