From 78858632566c30d2299bcdbd6efe3cbd1cc99d5a Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 12 Nov 2021 11:16:02 +0100
Subject: [PATCH] namespace: make tmp dir handling code independent of umask
 too

Let's make all code in namespace.c robust towards weird umask. This
doesn't matter too much given that the parent dirs we deal here almost
certainly exist anyway, but let's clean this up anyway and make it fully
clean.

(cherry picked from commit 30443439274cc223583c6c57f7d9041e440e346f)

Conflict:NA
Reference:https://github.com/systemd/systemd/commit/78858632566c30d2299bcdbd6efe3cbd1cc99d5a
---
 src/core/namespace.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/core/namespace.c b/src/core/namespace.c
index b10a53ad2e..9251871384 100644
--- a/src/core/namespace.c
+++ b/src/core/namespace.c
@@ -2466,7 +2466,8 @@ static int make_tmp_prefix(const char *prefix) {
         if (errno != ENOENT)
                 return -errno;
 
-        r = mkdir_parents(prefix, 0755);
+        RUN_WITH_UMASK(000)
+                r = mkdir_parents(prefix, 0755);
         if (r < 0)
                 return r;
 
@@ -2474,7 +2475,8 @@ static int make_tmp_prefix(const char *prefix) {
         if (r < 0)
                 return r;
 
-        if (mkdir(t, 0777) < 0)
+        if (mkdir(t, 0777) < 0) /* umask will corrupt this access mode, but that doesn't matter, we need to
+                                 * call chmod() anyway for the suid bit, below. */
                 return -errno;
 
         if (chmod(t, 01777) < 0) {
@@ -2533,10 +2535,9 @@ static int setup_one_tmp_dir(const char *id, const char *prefix, char **path, ch
                 if (!y)
                         return -ENOMEM;
 
-                RUN_WITH_UMASK(0000) {
+                RUN_WITH_UMASK(0000)
                         if (mkdir(y, 0777 | S_ISVTX) < 0)
                                     return -errno;
-                }
 
                 r = label_fix_container(y, prefix, 0);
                 if (r < 0)
@@ -2548,7 +2549,8 @@ static int setup_one_tmp_dir(const char *id, const char *prefix, char **path, ch
                 /* Trouble: we failed to create the directory. Instead of failing, let's simulate /tmp being
                  * read-only. This way the service will get the EROFS result as if it was writing to the real
                  * file system. */
-                r = mkdir_p(RUN_SYSTEMD_EMPTY, 0500);
+                RUN_WITH_UMASK(0000)
+                        r = mkdir_p(RUN_SYSTEMD_EMPTY, 0500);
                 if (r < 0)
                         return r;
 
-- 
2.33.0