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tmpfiles: fix crash with NULL in arg_root and other fixes and tests

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The function to replacement paths into the configuration file list was borked.
Apart from the crash with empty root prefix, it would incorrectly handle the
case where root *was* set, and the replacement file was supposed to override
an existing file.

prefix_root is used instead of path_join because prefix_root removes duplicate
slashes (when --root=dir/ is used).

A test is added.

Fixes #11124.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2018-12-19 23:05:48 +01:00
parent fcfb1f775e
commit 082bb1c59b
2 changed files with 73 additions and 9 deletions
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21
src/basic/conf-files.c
View File

@ -201,14 +201,17 @@ int conf_files_insert(char ***strv, const char *root, char **dirs, const char *p
if (c == 0) {
char **dir;
/* Oh, we found our spot and it already contains something. */
/* Oh, there already is an entry with a matching name (the last component). */
STRV_FOREACH(dir, dirs) {
_cleanup_free_ char *rdir = NULL;
char *p1, *p2;
p1 = path_startswith((*strv)[i], root);
if (p1)
/* Skip "/" in *dir, because p1 is without "/" too */
p1 = path_startswith(p1, *dir + 1);
rdir = prefix_root(root, *dir);
if (!rdir)
return -ENOMEM;
p1 = path_startswith((*strv)[i], rdir);
if (p1)
/* Existing entry with higher priority
* or same priority, no need to do anything. */
@ -217,7 +220,8 @@ int conf_files_insert(char ***strv, const char *root, char **dirs, const char *p
p2 = path_startswith(path, *dir);
if (p2) {
/* Our new entry has higher priority */
t = path_join(root, path);
t = prefix_root(root, path);
if (!t)
return log_oom();
@ -233,7 +237,8 @@ int conf_files_insert(char ***strv, const char *root, char **dirs, const char *p
/* … we are not there yet, let's continue */
}
t = path_join(root, path);
/* The new file has lower priority than all the existing entries */
t = prefix_root(root, path);
if (!t)
return -ENOMEM;
@ -308,7 +313,7 @@ int conf_files_list_with_replacement(
if (r < 0)
return log_error_errno(r, "Failed to extend config file list: %m");
p = path_join(root, replacement);
p = prefix_root(root, replacement);
if (!p)
return log_oom();
}

61
src/test/test-conf-files.c
View File

@ -13,6 +13,7 @@
#include "macro.h"
#include "mkdir.h"
#include "parse-util.h"
#include "path-util.h"
#include "rm-rf.h"
#include "string-util.h"
#include "strv.h"
@ -43,7 +44,7 @@ static void test_conf_files_list(bool use_root) {
_cleanup_strv_free_ char **found_files = NULL, **found_files2 = NULL;
const char *root_dir, *search_1, *search_2, *expect_a, *expect_b, *expect_c, *mask;
log_debug("/* %s */", __func__);
log_debug("/* %s(%s) */", __func__, yes_no(use_root));
setup_test_dir(tmp_dir,
"/dir1/a.conf",
@ -93,10 +94,68 @@ static void test_conf_files_list(bool use_root) {
assert_se(rm_rf(tmp_dir, REMOVE_ROOT|REMOVE_PHYSICAL) == 0);
}
static void test_conf_files_insert(const char *root) {
_cleanup_strv_free_ char **s = NULL;
log_info("/* %s root=%s */", __func__, strempty(root));
char **dirs = STRV_MAKE("/dir1", "/dir2", "/dir3");
_cleanup_free_ const char
*foo1 = prefix_root(root, "/dir1/foo.conf"),
*foo2 = prefix_root(root, "/dir2/foo.conf"),
*bar2 = prefix_root(root, "/dir2/bar.conf"),
*zzz3 = prefix_root(root, "/dir3/zzz.conf"),
*whatever = prefix_root(root, "/whatever.conf");
assert_se(conf_files_insert(&s, root, dirs, "/dir2/foo.conf") == 0);
assert_se(strv_equal(s, STRV_MAKE(foo2)));
/* The same file again, https://github.com/systemd/systemd/issues/11124 */
assert_se(conf_files_insert(&s, root, dirs, "/dir2/foo.conf") == 0);
assert_se(strv_equal(s, STRV_MAKE(foo2)));
/* Lower priority → new entry is ignored */
assert_se(conf_files_insert(&s, root, dirs, "/dir3/foo.conf") == 0);
assert_se(strv_equal(s, STRV_MAKE(foo2)));
/* Higher priority → new entry replaces */
assert_se(conf_files_insert(&s, root, dirs, "/dir1/foo.conf") == 0);
assert_se(strv_equal(s, STRV_MAKE(foo1)));
/* Earlier basename */
assert_se(conf_files_insert(&s, root, dirs, "/dir2/bar.conf") == 0);
assert_se(strv_equal(s, STRV_MAKE(bar2, foo1)));
/* Later basename */
assert_se(conf_files_insert(&s, root, dirs, "/dir3/zzz.conf") == 0);
assert_se(strv_equal(s, STRV_MAKE(bar2, foo1, zzz3)));
/* All lower priority → all ignored */
assert_se(conf_files_insert(&s, root, dirs, "/dir3/zzz.conf") == 0);
assert_se(conf_files_insert(&s, root, dirs, "/dir2/bar.conf") == 0);
assert_se(conf_files_insert(&s, root, dirs, "/dir3/bar.conf") == 0);
assert_se(conf_files_insert(&s, root, dirs, "/dir2/foo.conf") == 0);
assert_se(strv_equal(s, STRV_MAKE(bar2, foo1, zzz3)));
/* Two entries that don't match any of the directories, but match basename */
assert_se(conf_files_insert(&s, root, dirs, "/dir4/zzz.conf") == 0);
assert_se(conf_files_insert(&s, root, dirs, "/zzz.conf") == 0);
assert_se(strv_equal(s, STRV_MAKE(bar2, foo1, zzz3)));
/* An entry that doesn't match any of the directories, no match at all */
assert_se(conf_files_insert(&s, root, dirs, "/whatever.conf") == 0);
assert_se(strv_equal(s, STRV_MAKE(bar2, foo1, whatever, zzz3)));
}
int main(int argc, char **argv) {
test_setup_logging(LOG_DEBUG);
test_conf_files_list(false);
test_conf_files_list(true);
test_conf_files_insert(NULL);
test_conf_files_insert("/root");
test_conf_files_insert("/root/");
return 0;
}