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From c7d4f7a5a6cef5a46f905141e2ac27da3c96d2b7 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Mon, 23 Feb 2015 23:19:54 -0500
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Subject: [PATCH] tmpfiles: avoid creating duplicate acl entries
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https://bugs.freedesktop.org/show_bug.cgi?id=89202
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https://bugs.debian.org/778656
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Status quo ante can be restored with:
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getfacl -p /var/log/journal/`cat /etc/machine-id`|grep -v '^#'|sort -u|sudo setfacl --set-file=- /var/log/journal/`cat /etc/machine-id`
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(cherry picked from commit 1c73f3bc29111a00738569c9d40a989b161a0624)
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---
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src/shared/acl-util.c | 79 +++++++++++++++++++++++++++++++++++++++++--
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src/shared/acl-util.h | 4 +++
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2 files changed, 81 insertions(+), 2 deletions(-)
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diff --git a/src/shared/acl-util.c b/src/shared/acl-util.c
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index a4ff1ab878..cbe09d7aba 100644
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--- a/src/shared/acl-util.c
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+++ b/src/shared/acl-util.c
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@@ -282,6 +282,77 @@ int parse_acl(char *text, acl_t *acl_access, acl_t *acl_default, bool want_mask)
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return 0;
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}
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+static int acl_entry_equal(acl_entry_t a, acl_entry_t b) {
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+ acl_tag_t tag_a, tag_b;
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+
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+ if (acl_get_tag_type(a, &tag_a) < 0)
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+ return -errno;
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+
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+ if (acl_get_tag_type(b, &tag_b) < 0)
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+ return -errno;
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+
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+ if (tag_a != tag_b)
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+ return false;
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+
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+ switch (tag_a) {
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+ case ACL_USER_OBJ:
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+ case ACL_GROUP_OBJ:
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+ case ACL_MASK:
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+ case ACL_OTHER:
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+ /* can have only one of those */
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+ return true;
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+ case ACL_USER: {
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+ _cleanup_(acl_free_uid_tpp) uid_t *uid_a, *uid_b;
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+
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+ uid_a = acl_get_qualifier(a);
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+ if (!uid_a)
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+ return -errno;
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+
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+ uid_b = acl_get_qualifier(b);
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+ if (!uid_b)
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+ return -errno;
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+
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+ return *uid_a == *uid_b;
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+ }
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+ case ACL_GROUP: {
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+ _cleanup_(acl_free_gid_tpp) gid_t *gid_a, *gid_b;
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+
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+ gid_a = acl_get_qualifier(a);
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+ if (!gid_a)
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+ return -errno;
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+
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+ gid_b = acl_get_qualifier(b);
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+ if (!gid_b)
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+ return -errno;
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+
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+ return *gid_a == *gid_b;
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+ }
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+ default:
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+ assert_not_reached("Unknown acl tag type");
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+ }
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+}
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+
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+static int find_acl_entry(acl_t acl, acl_entry_t entry, acl_entry_t *out) {
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+ acl_entry_t i;
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+ int r;
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+
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+ for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
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+ r > 0;
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+ r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
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+
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+ r = acl_entry_equal(i, entry);
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+ if (r < 0)
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+ return r;
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+ if (r > 0) {
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+ *out = i;
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+ return 1;
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+ }
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+ }
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+ if (r < 0)
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+ return -errno;
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+ return 0;
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+}
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+
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int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl) {
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_cleanup_(acl_freep) acl_t old;
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acl_entry_t i;
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@@ -297,8 +368,12 @@ int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl) {
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acl_entry_t j;
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- if (acl_create_entry(&old, &j) < 0)
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- return -errno;
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+ r = find_acl_entry(old, i, &j);
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+ if (r < 0)
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+ return r;
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+ if (r == 0)
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+ if (acl_create_entry(&old, &j) < 0)
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+ return -errno;
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if (acl_copy_entry(j, i) < 0)
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return -errno;
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diff --git a/src/shared/acl-util.h b/src/shared/acl-util.h
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index 90e88ffa26..fdb90063fa 100644
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--- a/src/shared/acl-util.h
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+++ b/src/shared/acl-util.h
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@@ -41,5 +41,9 @@ int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl);
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DEFINE_TRIVIAL_CLEANUP_FUNC(acl_t, acl_free);
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#define acl_free_charp acl_free
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DEFINE_TRIVIAL_CLEANUP_FUNC(char*, acl_free_charp);
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+#define acl_free_uid_tp acl_free
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+DEFINE_TRIVIAL_CLEANUP_FUNC(uid_t*, acl_free_uid_tp);
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+#define acl_free_gid_tp acl_free
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+DEFINE_TRIVIAL_CLEANUP_FUNC(gid_t*, acl_free_gid_tp);
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#endif
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