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Upstream-Status: Backport
Signed-off-by: Dan McGregor <dan.mcgregor@usask.ca>
From 33d36e28b0a23fb7ac33435a1329d65bff1ba4ec Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Mon, 23 Feb 2015 23:19:54 -0500
Subject: [PATCH] tmpfiles: avoid creating duplicate acl entries
https://bugs.freedesktop.org/show_bug.cgi?id=89202
https://bugs.debian.org/778656
Status quo ante can be restored with:
getfacl -p /var/log/journal/`cat /etc/machine-id`|grep -v '^#'|sort -u|sudo setfacl --set-file=- /var/log/journal/`cat /etc/machine-id`
(cherry picked from commit 1c73f3bc29111a00738569c9d40a989b161a0624)
---
src/shared/acl-util.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++--
src/shared/acl-util.h | 4 +++
2 files changed, 81 insertions(+), 2 deletions(-)
diff --git a/src/shared/acl-util.c b/src/shared/acl-util.c
index a4ff1ab..cbe09d7 100644
--- a/src/shared/acl-util.c
+++ b/src/shared/acl-util.c
@@ -282,6 +282,77 @@ int parse_acl(char *text, acl_t *acl_access, acl_t *acl_default, bool want_mask)
return 0;
}
+static int acl_entry_equal(acl_entry_t a, acl_entry_t b) {
+ acl_tag_t tag_a, tag_b;
+
+ if (acl_get_tag_type(a, &tag_a) < 0)
+ return -errno;
+
+ if (acl_get_tag_type(b, &tag_b) < 0)
+ return -errno;
+
+ if (tag_a != tag_b)
+ return false;
+
+ switch (tag_a) {
+ case ACL_USER_OBJ:
+ case ACL_GROUP_OBJ:
+ case ACL_MASK:
+ case ACL_OTHER:
+ /* can have only one of those */
+ return true;
+ case ACL_USER: {
+ _cleanup_(acl_free_uid_tpp) uid_t *uid_a, *uid_b;
+
+ uid_a = acl_get_qualifier(a);
+ if (!uid_a)
+ return -errno;
+
+ uid_b = acl_get_qualifier(b);
+ if (!uid_b)
+ return -errno;
+
+ return *uid_a == *uid_b;
+ }
+ case ACL_GROUP: {
+ _cleanup_(acl_free_gid_tpp) gid_t *gid_a, *gid_b;
+
+ gid_a = acl_get_qualifier(a);
+ if (!gid_a)
+ return -errno;
+
+ gid_b = acl_get_qualifier(b);
+ if (!gid_b)
+ return -errno;
+
+ return *gid_a == *gid_b;
+ }
+ default:
+ assert_not_reached("Unknown acl tag type");
+ }
+}
+
+static int find_acl_entry(acl_t acl, acl_entry_t entry, acl_entry_t *out) {
+ acl_entry_t i;
+ int r;
+
+ for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
+ r > 0;
+ r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
+
+ r = acl_entry_equal(i, entry);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ *out = i;
+ return 1;
+ }
+ }
+ if (r < 0)
+ return -errno;
+ return 0;
+}
+
int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl) {
_cleanup_(acl_freep) acl_t old;
acl_entry_t i;
@@ -297,8 +368,12 @@ int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl) {
acl_entry_t j;
- if (acl_create_entry(&old, &j) < 0)
- return -errno;
+ r = find_acl_entry(old, i, &j);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ if (acl_create_entry(&old, &j) < 0)
+ return -errno;
if (acl_copy_entry(j, i) < 0)
return -errno;
diff --git a/src/shared/acl-util.h b/src/shared/acl-util.h
index 90e88ff..fdb9006 100644
--- a/src/shared/acl-util.h
+++ b/src/shared/acl-util.h
@@ -41,5 +41,9 @@ int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl);
DEFINE_TRIVIAL_CLEANUP_FUNC(acl_t, acl_free);
#define acl_free_charp acl_free
DEFINE_TRIVIAL_CLEANUP_FUNC(char*, acl_free_charp);
+#define acl_free_uid_tp acl_free
+DEFINE_TRIVIAL_CLEANUP_FUNC(uid_t*, acl_free_uid_tp);
+#define acl_free_gid_tp acl_free
+DEFINE_TRIVIAL_CLEANUP_FUNC(gid_t*, acl_free_gid_tp);
#endif
--
2.3.1
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