From e15e123cb7692aa16825630cd4315a85b8197b74 Mon Sep 17 00:00:00 2001
From: Michael Marineau <michael.marineau@coreos.com>
Date: Fri, 31 Jan 2014 15:35:04 -0800
Subject: [PATCH] shared: include root when canonicalizing conf paths
The conf_files_list family accepts an alternate root path to prefix all
directories in the list but path_strv_canonicalize_uniq doesn't use it.
This results in the suspicious behavior of resolving directory symlinks
based on the contents of / instead of the alternate root.
This adds a prefix argument to path_strv_canonicalize which will now
prepend the prefix, if given, to every path in the list. To avoid
answering what a relative path means when called with a root prefix
path_strv_canonicalize is now path_strv_canonicalize_absolute and only
considers absolute paths. Fortunately all users of already call
path_strv_canonicalize with a list of absolute paths.
(cherry picked from commit 112cfb181453e38d3ef4a74fba23abbb53392002)
---
src/shared/conf-files.c | 10 +++-------
src/shared/path-lookup.c | 6 +++---
src/shared/path-util.c | 29 +++++++++++++++++++----------
src/shared/path-util.h | 4 ++--
src/shared/util.c | 2 +-
src/udev/udev-rules.c | 2 +-
6 files changed, 29 insertions(+), 24 deletions(-)
diff --git a/src/shared/conf-files.c b/src/shared/conf-files.c
index ed4070c..3d5b1df 100644
--- a/src/shared/conf-files.c
+++ b/src/shared/conf-files.c
@@ -37,12 +37,8 @@
#include "hashmap.h"
#include "conf-files.h"
-static int files_add(Hashmap *h, const char *root, const char *path, const char *suffix) {
+static int files_add(Hashmap *h, const char *dirpath, const char *suffix) {
_cleanup_closedir_ DIR *dir = NULL;
- _cleanup_free_ char *dirpath = NULL;
-
- if (asprintf(&dirpath, "%s%s", root ? root : "", path) < 0)
- return -ENOMEM;
dir = opendir(dirpath);
if (!dir) {
@@ -104,7 +100,7 @@ static int conf_files_list_strv_internal(char ***strv, const char *suffix, const
assert(suffix);
/* This alters the dirs string array */
- if (!path_strv_canonicalize_uniq(dirs))
+ if (!path_strv_canonicalize_absolute_uniq(dirs, root))
return -ENOMEM;
fh = hashmap_new(string_hash_func, string_compare_func);
@@ -112,7 +108,7 @@ static int conf_files_list_strv_internal(char ***strv, const char *suffix, const
return -ENOMEM;
STRV_FOREACH(p, dirs) {
- r = files_add(fh, root, *p, suffix);
+ r = files_add(fh, *p, suffix);
if (r == -ENOMEM) {
hashmap_free_free(fh);
return r;
diff --git a/src/shared/path-lookup.c b/src/shared/path-lookup.c
index 1a47ea9..03c1380 100644
--- a/src/shared/path-lookup.c
+++ b/src/shared/path-lookup.c
@@ -316,7 +316,7 @@ int lookup_paths_init(
}
}
- if (!path_strv_canonicalize(p->unit_path))
+ if (!path_strv_canonicalize_absolute(p->unit_path, NULL))
return -ENOMEM;
strv_uniq(p->unit_path);
@@ -372,10 +372,10 @@ int lookup_paths_init(
return -ENOMEM;
}
- if (!path_strv_canonicalize(p->sysvinit_path))
+ if (!path_strv_canonicalize_absolute(p->sysvinit_path, NULL))
return -ENOMEM;
- if (!path_strv_canonicalize(p->sysvrcnd_path))
+ if (!path_strv_canonicalize_absolute(p->sysvrcnd_path, NULL))
return -ENOMEM;
strv_uniq(p->sysvinit_path);
diff --git a/src/shared/path-util.c b/src/shared/path-util.c
index d8c14e8..36542cd 100644
--- a/src/shared/path-util.c
+++ b/src/shared/path-util.c
@@ -165,7 +165,7 @@ char **path_strv_make_absolute_cwd(char **l) {
return l;
}
-char **path_strv_canonicalize(char **l) {
+char **path_strv_canonicalize_absolute(char **l, const char *prefix) {
char **s;
unsigned k = 0;
bool enomem = false;
@@ -180,13 +180,21 @@ char **path_strv_canonicalize(char **l) {
STRV_FOREACH(s, l) {
char *t, *u;
- t = path_make_absolute_cwd(*s);
- free(*s);
- *s = NULL;
-
- if (!t) {
- enomem = true;
+ if (!path_is_absolute(*s))
continue;
+
+ if (prefix) {
+ t = strappend(prefix, *s);
+ free(*s);
+ *s = NULL;
+
+ if (!t) {
+ enomem = true;
+ continue;
+ }
+ } else {
+ t = *s;
+ *s = NULL;
}
errno = 0;
@@ -196,7 +204,7 @@ char **path_strv_canonicalize(char **l) {
u = t;
else {
free(t);
- if (errno == ENOMEM || !errno)
+ if (errno == ENOMEM || errno == 0)
enomem = true;
continue;
@@ -215,11 +223,12 @@ char **path_strv_canonicalize(char **l) {
return l;
}
-char **path_strv_canonicalize_uniq(char **l) {
+char **path_strv_canonicalize_absolute_uniq(char **l, const char *prefix) {
+
if (strv_isempty(l))
return l;
- if (!path_strv_canonicalize(l))
+ if (!path_strv_canonicalize_absolute(l, prefix))
return NULL;
return strv_uniq(l);
diff --git a/src/shared/path-util.h b/src/shared/path-util.h
index 1e58e1b..f867ab6 100644
--- a/src/shared/path-util.h
+++ b/src/shared/path-util.h
@@ -46,8 +46,8 @@ char* path_startswith(const char *path, const char *prefix) _pure_;
bool path_equal(const char *a, const char *b) _pure_;
char** path_strv_make_absolute_cwd(char **l);
-char** path_strv_canonicalize(char **l);
-char** path_strv_canonicalize_uniq(char **l);
+char** path_strv_canonicalize_absolute(char **l, const char *prefix);
+char** path_strv_canonicalize_absolute_uniq(char **l, const char *prefix);
int path_is_mount_point(const char *path, bool allow_symlink);
int path_is_read_only_fs(const char *path);
diff --git a/src/shared/util.c b/src/shared/util.c
index 617c3ac..533db92 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -5704,7 +5704,7 @@ static int search_and_fopen_internal(const char *path, const char *mode, char **
assert(mode);
assert(_f);
- if (!path_strv_canonicalize_uniq(search))
+ if (!path_strv_canonicalize_absolute_uniq(search, NULL))
return -ENOMEM;
STRV_FOREACH(i, search) {
diff --git a/src/udev/udev-rules.c b/src/udev/udev-rules.c
index 366d870..7e6db81 100644
--- a/src/udev/udev-rules.c
+++ b/src/udev/udev-rules.c
@@ -1628,7 +1628,7 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
log_error("failed to build config directory array");
return udev_rules_unref(rules);
}
- if (!path_strv_canonicalize(rules->dirs)) {
+ if (!path_strv_canonicalize_absolute(rules->dirs, NULL)) {
log_error("failed to canonicalize config directories\n");
return udev_rules_unref(rules);
}