[Devel] [PATCH vz10 1/2] selftests: ve: grant the directories the files sit in

[Eva Kurchatova <eva.kurchatova@virtuozzo.com>]

The sysfs variant names nested leaves, kernel/vmcoreinfo and
kernel/notes, while the proc one names files at the top of the
filesystem. Both enforcement tests grant the leaves and nothing else,
so in the sysfs case the lookup stops at /sys/kernel, which a fresh VE
cannot traverse, and every open answers ENOENT:

  not ok 14 ve_perms.sysfs.enforce_allows
  not ok 15 ve_perms.sysfs.enforce_denies

Grant x on each directory along the way, taken from the path the
variant already gives. A file at the top of the filesystem has none
and needs nothing, so the proc variant is unaffected.

The suite then passes 16 of 16, where it passed 14 before.

https://virtuozzo.atlassian.net/browse/VSTOR-144955

Feature: fix vz selftests
Signed-off-by: Eva Kurchatova <eva.kurchatova@virtuozzo.com>
---
 tools/testing/selftests/ve/ve_perms_test.c | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/tools/testing/selftests/ve/ve_perms_test.c b/tools/testing/selftests/ve/ve_perms_test.c
index 25ffbd42c380..2b542dc30139 100644
--- a/tools/testing/selftests/ve/ve_perms_test.c
+++ b/tools/testing/selftests/ve/ve_perms_test.c
@@ -348,6 +348,37 @@ TEST_F(ve_perms, write_parser)
  * read, and granting x on the directory lets it be traversed (the lookup then
  * fails ENOENT on the missing child, not EACCES).
  */
+/*
+ * A leaf is only reachable once every directory above it can be traversed.
+ * The variants name their files relative to the mount point, so grant x on
+ * each directory along the way; a file at the top of the filesystem has
+ * none and needs nothing.
+ */
+static int allow_path(int cgv2_fd, const char *path, const char *file)
+{
+	char dir[240];	/* set_entry() writes "<dir> <mask>" into 256 */
+	const char *sep;
+
+	for (sep = strchr(file, '/'); sep; sep = strchr(sep + 1, '/')) {
+		if (sep - file >= (long)sizeof(dir))
+			return -1;
+		snprintf(dir, sizeof(dir), "%.*s", (int)(sep - file), file);
+		if (set_entry(cgv2_fd, path, dir, "x") < 0)
+			return -1;
+	}
+	return 0;
+}
+
+static int allow_paths(int cgv2_fd, const char *path, const char *const files[])
+{
+	int i;
+
+	for (i = 0; i < NR_FILES; i++)
+		if (allow_path(cgv2_fd, path, files[i]) < 0)
+			return -1;
+	return 0;
+}
+
 TEST_F(ve_perms, enforce_allows)
 {
 	char path[PATH_MAX], absent[128];
@@ -358,6 +389,7 @@ TEST_F(ve_perms, enforce_allows)
 
 	ve_file(path, sizeof(path), self->ctid_a, variant->fs);
 
+	ASSERT_EQ(allow_paths(self->cgv2_fd, path, variant->files), 0);
 	ASSERT_EQ(set_entries(self->cgv2_fd, path, variant->files, "r"), 0);
 	for (i = 0; i < NR_FILES; i++)
 		EXPECT_EQ(ve_open_rel(self->cgv2_fd, self->ctid_a,
@@ -400,6 +432,7 @@ TEST_F(ve_perms, enforce_denies)
 				      O_RDONLY), 0);
 
 	/* Granted w only: visible but not readable. */
+	ASSERT_EQ(allow_paths(self->cgv2_fd, path, variant->files), 0);
 	ASSERT_EQ(set_entries(self->cgv2_fd, path, variant->files, "w"), 0);
 	for (i = 0; i < NR_FILES; i++)
 		EXPECT_EQ(ve_open_rel(self->cgv2_fd, self->ctid_a,
-- 
2.55.0

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