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authorDJ Delorie <dj@redhat.com>2018-12-04 00:03:12 -0500
committerDJ Delorie <dj@redhat.com>2018-12-04 00:03:12 -0500
commitb2e93de0ffedcfe2cfba100d47a4d4f6f85cea0b (patch)
treee98bdca317151daf10357da32ef0814b34dcf0a4 /support
parent477a02f63751c4b759ddd9454d17f2a7ad120ee3 (diff)
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test-container: add "su" command to run test as root, add unshare hints
* support/test-container.c (check_for_unshare_hints): New. (main): Call it if unshare fails. Add support for "su" scriptlet command.
Diffstat (limited to 'support')
-rw-r--r--support/test-container.c68
1 files changed, 64 insertions, 4 deletions
diff --git a/support/test-container.c b/support/test-container.c
index b58f0f7..df450ad 100644
--- a/support/test-container.c
+++ b/support/test-container.c
@@ -88,15 +88,22 @@ int verbose = 0;
* mytest.root/ is rsync'd into container
* mytest.root/preclean.req causes fresh rsync (with delete) before
test if present
- * mytest.root/mytset.script has a list of "commands" to run:
+ * mytest.root/mytest.script has a list of "commands" to run:
syntax:
# comment
+ su
mv FILE FILE
cp FILE FILE
rm FILE
FILE must start with $B/, $S/, $I/, $L/, or /
(expands to build dir, source dir, install dir, library dir
(in container), or container's root)
+ details:
+ - '#': A comment.
+ - 'su': Enables running test as root in the container.
+ - 'mv': A minimal move files command.
+ - 'cp': A minimal copy files command.
+ - 'rm': A minimal remove files command.
* mytest.root/postclean.req causes fresh rsync (with delete) after
test if present
@@ -349,6 +356,7 @@ recursive_remove (char *path)
switch (child) {
case -1:
+ perror("fork");
FAIL_EXIT1 ("Unable to fork");
case 0:
/* Child. */
@@ -610,6 +618,47 @@ rsync (char *src, char *dest, int and_delete)
}
+
+/* See if we can detect what the user needs to do to get unshare
+ support working for us. */
+void
+check_for_unshare_hints (void)
+{
+ FILE *f;
+ int i;
+
+ /* Default Debian Linux disables user namespaces, but allows a way
+ to enable them. */
+ f = fopen ("/proc/sys/kernel/unprivileged_userns_clone", "r");
+ if (f != NULL)
+ {
+ i = 99; /* Sentinel. */
+ fscanf (f, "%d", &i);
+ if (i == 0)
+ {
+ printf ("To enable test-container, please run this as root:\n");
+ printf (" echo 1 > /proc/sys/kernel/unprivileged_userns_clone\n");
+ }
+ fclose (f);
+ return;
+ }
+
+ /* ALT Linux has an alternate way of doing the same. */
+ f = fopen ("/proc/sys/kernel/userns_restrict", "r");
+ if (f != NULL)
+ {
+ i = 99; /* Sentinel. */
+ fscanf (f, "%d", &i);
+ if (i == 1)
+ {
+ printf ("To enable test-container, please run this as root:\n");
+ printf (" echo 0 > /proc/sys/kernel/userns_restrict\n");
+ }
+ fclose (f);
+ return;
+ }
+}
+
int
main (int argc, char **argv)
{
@@ -628,6 +677,8 @@ main (int argc, char **argv)
uid_t original_uid;
gid_t original_gid;
+ /* If set, the test runs as root instead of the user running the testsuite. */
+ int be_su = 0;
int UMAP;
int GMAP;
/* Used for "%lld %lld 1" so need not be large. */
@@ -857,6 +908,10 @@ main (int argc, char **argv)
{
maybe_xunlink (the_words[1]);
}
+ else if (nt == 1 && strcmp (the_words[0], "su") == 0)
+ {
+ be_su = 1;
+ }
else if (nt > 0 && the_words[0][0] != '#')
{
printf ("\033[31minvalid [%s]\033[0m\n", the_words[0]);
@@ -873,7 +928,12 @@ main (int argc, char **argv)
/* Older kernels may not support all the options, or security
policy may block this call. */
if (errno == EINVAL || errno == EPERM)
- FAIL_UNSUPPORTED ("unable to unshare user/fs: %s", strerror (errno));
+ {
+ int saved_errno = errno;
+ if (errno == EPERM)
+ check_for_unshare_hints ();
+ FAIL_UNSUPPORTED ("unable to unshare user/fs: %s", strerror (saved_errno));
+ }
else
FAIL_EXIT1 ("unable to unshare user/fs: %s", strerror (errno));
}
@@ -952,7 +1012,7 @@ main (int argc, char **argv)
FAIL_EXIT1 ("can't write to /proc/self/uid_map\n");
sprintf (tmp, "%lld %lld 1\n",
- (long long) original_uid, (long long) original_uid);
+ (long long) (be_su ? 0 : original_uid), (long long) original_uid);
write (UMAP, tmp, strlen (tmp));
xclose (UMAP);
@@ -973,7 +1033,7 @@ main (int argc, char **argv)
FAIL_EXIT1 ("can't write to /proc/self/gid_map\n");
sprintf (tmp, "%lld %lld 1\n",
- (long long) original_gid, (long long) original_gid);
+ (long long) (be_su ? 0 : original_gid), (long long) original_gid);
write (GMAP, tmp, strlen (tmp));
xclose (GMAP);