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182 lines
5.9 KiB
182 lines
5.9 KiB
From e3e479fc9c51e0b6f2c21087e2e78e7c6f55169c Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Mon, 25 May 2020 00:34:58 +0200
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Subject: [PATCH] unit-name: tighten checks for building valid unit names
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Let's be more thorough that whenever we build a unit name based on
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parameters, that the result is actually a valid user name. If it isn't
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fail early.
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This should allows us to catch various issues earlier, in particular
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when we synthesize mount units from /proc/self/mountinfo: instead of
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actually attempting to allocate a mount unit we will fail much earlier
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when we build the name to synthesize the unit under. Failing early is a
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good thing generally.
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(cherry picked from commit ab19db01ae1826efb3cbdf6dcb6a14412f8844d4)
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Related: #1940973
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---
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src/basic/unit-name.c | 61 ++++++++++++++++++++++++++++++-------------
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1 file changed, 43 insertions(+), 18 deletions(-)
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diff --git a/src/basic/unit-name.c b/src/basic/unit-name.c
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index 614eb8649b..f9b3fafd4d 100644
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--- a/src/basic/unit-name.c
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+++ b/src/basic/unit-name.c
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@@ -207,8 +207,9 @@ UnitType unit_name_to_type(const char *n) {
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}
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int unit_name_change_suffix(const char *n, const char *suffix, char **ret) {
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- char *e, *s;
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+ _cleanup_free_ char *s = NULL;
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size_t a, b;
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+ char *e;
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assert(n);
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assert(suffix);
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@@ -230,8 +231,12 @@ int unit_name_change_suffix(const char *n, const char *suffix, char **ret) {
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return -ENOMEM;
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strcpy(mempcpy(s, n, a), suffix);
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- *ret = s;
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+ /* Make sure the name is still valid (i.e. didn't grow too large due to longer suffix) */
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+ if (!unit_name_is_valid(s, UNIT_NAME_ANY))
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+ return -EINVAL;
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+
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+ *ret = TAKE_PTR(s);
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return 0;
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}
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@@ -253,8 +258,8 @@ int unit_name_build(const char *prefix, const char *instance, const char *suffix
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}
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int unit_name_build_from_type(const char *prefix, const char *instance, UnitType type, char **ret) {
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+ _cleanup_free_ char *s = NULL;
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const char *ut;
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- char *s;
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assert(prefix);
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assert(type >= 0);
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@@ -264,19 +269,23 @@ int unit_name_build_from_type(const char *prefix, const char *instance, UnitType
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if (!unit_prefix_is_valid(prefix))
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return -EINVAL;
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- if (instance && !unit_instance_is_valid(instance))
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- return -EINVAL;
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-
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ut = unit_type_to_string(type);
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- if (!instance)
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- s = strjoin(prefix, ".", ut);
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- else
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+ if (instance) {
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+ if (!unit_instance_is_valid(instance))
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+ return -EINVAL;
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+
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s = strjoin(prefix, "@", instance, ".", ut);
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+ } else
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+ s = strjoin(prefix, ".", ut);
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if (!s)
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return -ENOMEM;
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- *ret = s;
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+ /* Verify that this didn't grow too large (or otherwise is invalid) */
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+ if (!unit_name_is_valid(s, instance ? UNIT_NAME_INSTANCE : UNIT_NAME_PLAIN))
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+ return -EINVAL;
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+
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+ *ret = TAKE_PTR(s);
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return 0;
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}
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@@ -445,8 +454,8 @@ int unit_name_path_unescape(const char *f, char **ret) {
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}
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int unit_name_replace_instance(const char *f, const char *i, char **ret) {
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+ _cleanup_free_ char *s = NULL;
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const char *p, *e;
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- char *s;
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size_t a, b;
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assert(f);
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@@ -470,7 +479,11 @@ int unit_name_replace_instance(const char *f, const char *i, char **ret) {
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strcpy(mempcpy(mempcpy(s, f, a + 1), i, b), e);
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- *ret = s;
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+ /* Make sure the resulting name still is valid, i.e. didn't grow too large */
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+ if (!unit_name_is_valid(s, UNIT_NAME_INSTANCE))
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+ return -EINVAL;
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+
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+ *ret = TAKE_PTR(s);
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return 0;
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}
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@@ -501,8 +514,7 @@ int unit_name_template(const char *f, char **ret) {
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}
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int unit_name_from_path(const char *path, const char *suffix, char **ret) {
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- _cleanup_free_ char *p = NULL;
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- char *s = NULL;
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+ _cleanup_free_ char *p = NULL, *s = NULL;
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int r;
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assert(path);
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@@ -520,7 +532,11 @@ int unit_name_from_path(const char *path, const char *suffix, char **ret) {
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if (!s)
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return -ENOMEM;
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- *ret = s;
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+ /* Refuse this if this got too long or for some other reason didn't result in a valid name */
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+ if (!unit_name_is_valid(s, UNIT_NAME_PLAIN))
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+ return -EINVAL;
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+
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+ *ret = TAKE_PTR(s);
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return 0;
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}
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@@ -548,6 +564,10 @@ int unit_name_from_path_instance(const char *prefix, const char *path, const cha
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if (!s)
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return -ENOMEM;
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+ /* Refuse this if this got too long or for some other reason didn't result in a valid name */
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+ if (!unit_name_is_valid(s, UNIT_NAME_INSTANCE))
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+ return -EINVAL;
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+
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*ret = s;
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return 0;
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}
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@@ -601,7 +621,7 @@ static bool do_escape_mangle(const char *f, bool allow_globs, char *t) {
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* If @allow_globs, globs characters are preserved. Otherwise, they are escaped.
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*/
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int unit_name_mangle_with_suffix(const char *name, UnitNameMangle flags, const char *suffix, char **ret) {
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- char *s;
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+ _cleanup_free_ char *s = NULL;
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int r;
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bool mangled;
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@@ -656,7 +676,12 @@ int unit_name_mangle_with_suffix(const char *name, UnitNameMangle flags, const c
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if ((!(flags & UNIT_NAME_MANGLE_GLOB) || !string_is_glob(s)) && unit_name_to_type(s) < 0)
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strcat(s, suffix);
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- *ret = s;
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+ /* Make sure mangling didn't grow this too large (but don't do this check if globbing is allowed,
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+ * since globs generally do not qualify as valid unit names) */
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+ if (!FLAGS_SET(flags, UNIT_NAME_MANGLE_GLOB) && !unit_name_is_valid(s, UNIT_NAME_ANY))
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+ return -EINVAL;
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+
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+ *ret = TAKE_PTR(s);
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return 1;
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good:
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@@ -664,7 +689,7 @@ good:
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if (!s)
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return -ENOMEM;
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- *ret = s;
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+ *ret = TAKE_PTR(s);
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return 0;
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}
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