Backport fix of --no-overwrite-dir
Upstream commit 4e742fc8674064a9fa00d4483d06aca48d5b0463 Resolves: RHEL-57019
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Pavel Cahyna
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5b785e5e07
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ad73b5244b
182
tar-1.30-no-overwrite-dir-no-overwrite-even-temporarily.patch
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182
tar-1.30-no-overwrite-dir-no-overwrite-even-temporarily.patch
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From d4f7fd373e79dddd7f411589808d80ac8032e6e3 Mon Sep 17 00:00:00 2001
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From: Paul Eggert <eggert@cs.ucla.edu>
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Date: Sat, 26 Jul 2025 21:41:23 -0700
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Subject: [PATCH] --no-overwrite-dir no overwrite even temporarily
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Problem and fix reported by Pavel Cahyna in
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https://lists.gnu.org/r/bug-tar/2025-01/msg00000.html
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* src/extract.c (extract_dir): With --no-overwrite-dir,
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skip the chmod if the directory already exists.
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* tests/extrac23.at (--no-overwrite-dir on empty directory):
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Move the part of the test that looks at a nonempty directory ...
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* tests/extrac30.at: ... to this new file, because the test now
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must be run as non-root. Adjust the test to match the new behavior.
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* tests/Makefile.am (TESTSUITE_AT), tests/testsuite.at: Add it.
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---
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src/extract.c | 25 ------------------------
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tests/Makefile.am | 1 +
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tests/extrac23.at | 16 +---------------
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tests/extrac30.at | 47 ++++++++++++++++++++++++++++++++++++++++++++++
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tests/testsuite.at | 1 +
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5 files changed, 50 insertions(+), 40 deletions(-)
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create mode 100644 tests/extrac30.at
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diff --git a/src/extract.c b/src/extract.c
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index 3878bc81..d7bac584 100644
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--- a/src/extract.c
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+++ b/src/extract.c
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@@ -1041,31 +1041,6 @@ extract_dir (char *file_name, int typeflag)
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repair_delayed_set_stat (file_name, &st);
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return 0;
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}
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- else if (old_files_option == NO_OVERWRITE_DIR_OLD_FILES)
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- {
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- /* Temporarily change the directory mode to a safe
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- value, to be able to create files in it, should
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- the need be.
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- */
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- mode = safe_dir_mode (&st);
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- status = fd_chmod(-1, file_name, mode,
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- AT_SYMLINK_NOFOLLOW, DIRTYPE);
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- if (status == 0)
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- {
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- /* Store the actual directory mode, to be restored
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- later.
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- */
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- current_stat_info.stat = st;
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- current_mode = mode & ~ current_umask;
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- current_mode_mask = MODE_RWX;
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- atflag = AT_SYMLINK_NOFOLLOW;
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- break;
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- }
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- else
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- {
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- chmod_error_details (file_name, mode);
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- }
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- }
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break;
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}
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}
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diff --git a/tests/Makefile.am b/tests/Makefile.am
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index af80ec0b..b55305f5 100644
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--- a/tests/Makefile.am
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+++ b/tests/Makefile.am
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@@ -111,6 +111,7 @@ TESTSUITE_AT = \
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extrac20.at\
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extrac21.at\
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extrac23.at\
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+ extrac30.at\
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filerem01.at\
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filerem02.at\
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dirrem01.at\
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diff --git a/tests/extrac23.at b/tests/extrac23.at
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index 669d18b6..991f84cb 100644
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--- a/tests/extrac23.at
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+++ b/tests/extrac23.at
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@@ -15,15 +15,12 @@
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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-AT_SETUP([--no-overwrite-dir])
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+AT_SETUP([--no-overwrite-dir on empty directory])
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AT_KEYWORDS([extract extrac23 no-overwrite-dir])
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# Description: Implementation of the --no-overwrite-dir option was flawed in
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# tar versions up to 1.32.90. This option is intended to preserve metadata
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# of existing directories. In fact it worked only for non-empty directories.
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-# Moreover, if the actual directory was owned by the user tar runs as and the
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-# S_IWUSR bit was not set in its actual permissions, tar failed to create files
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-# in it.
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#
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# Reported by: Michael Kaufmann <mail@michael-kaufmann.ch>
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# References: <20200207112934.Horde.anXzYhAj2CHiwUrw5CuT0G-@webmail.michael-kaufmann.ch>,
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@@ -38,21 +35,10 @@ chmod 777 dir
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tar -xf a.tar --no-overwrite-dir
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genfile --stat=mode.777 dir
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-# Test if temprorary permissions are set correctly to allow the owner
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-# to write to the directory.
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-genfile --file dir/file
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-tar cf a.tar dir
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-rm dir/file
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-chmod 400 dir
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-tar -xf a.tar --no-overwrite-dir
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-genfile --stat=mode.777 dir
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-chmod 700 dir
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find dir
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],
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[0],
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[777
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-400
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dir
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-dir/file
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])
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AT_CLEANUP
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diff --git a/tests/extrac30.at b/tests/extrac30.at
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new file mode 100644
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index 00000000..8c879c95
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--- /dev/null
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+++ b/tests/extrac30.at
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@@ -0,0 +1,47 @@
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+# Test suite for GNU tar. -*- Autotest -*-
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+# Copyright 2020-2025 Free Software Foundation, Inc.
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+#
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+# This file is part of GNU tar.
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+#
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+# GNU tar is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 3 of the License, or
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+# (at your option) any later version.
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+#
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+# GNU tar is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+AT_SETUP([--no-overwrite-dir on unwritable directory])
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+AT_KEYWORDS([extract extrac30 no-overwrite-dir])
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+
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+# Make sure that tar does not change permissions on directories if
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+# --no-overwrite-dir tells it not to, not even temporarily.
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+
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+AT_TAR_CHECK([
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+AT_UNPRIVILEGED_PREREQ
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+
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+# Test that the user cannot write to a unwritable directory
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+# if --no-overwrite-dir is used.
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+mkdir dir
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+chmod 755 dir
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+genfile --file dir/file
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+tar cf a.tar dir
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+rm dir/file
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+chmod 555 dir
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+tar -xf a.tar --no-overwrite-dir
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+genfile --stat=mode.777 dir
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+chmod 755 dir
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+find dir
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+],
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+[0],
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+[555
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+dir
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+],
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+[tar: dir/file: Cannot open: Permission denied
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+tar: Exiting with failure status due to previous errors
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+])
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+AT_CLEANUP
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diff --git a/tests/testsuite.at b/tests/testsuite.at
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index 9bade4f2..3275d1c5 100644
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--- a/tests/testsuite.at
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+++ b/tests/testsuite.at
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@@ -310,6 +310,7 @@ m4_include([extrac19.at])
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m4_include([extrac20.at])
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m4_include([extrac21.at])
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m4_include([extrac23.at])
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+m4_include([extrac30.at])
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m4_include([backup01.at])
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--
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2.39.5
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2
tar.spec
2
tar.spec
@ -38,6 +38,8 @@ Patch20: tar-1.34-Warn-file-changed-as-we-read-it-less-often.patch
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# use this to enforce the order where genfile wins the race
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# and removes the test file before tar archives it.
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Patch21: tar-1.30-filerem01.at-swap-actions.patch
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# Source: https://cgit.git.savannah.gnu.org/cgit/tar.git/diff/?id=4e742fc8674064a9fa00d4483d06aca48d5b0463
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Patch22: tar-1.30-no-overwrite-dir-no-overwrite-even-temporarily.patch
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# run "make check" by default
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%bcond_without check
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