diff options
Diffstat (limited to 'meta/recipes-core/glib-2.0/glib-2.0/CVE-2021-28153-4.patch')
| -rw-r--r-- | meta/recipes-core/glib-2.0/glib-2.0/CVE-2021-28153-4.patch | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/meta/recipes-core/glib-2.0/glib-2.0/CVE-2021-28153-4.patch b/meta/recipes-core/glib-2.0/glib-2.0/CVE-2021-28153-4.patch new file mode 100644 index 0000000000..5b106e8474 --- /dev/null +++ b/meta/recipes-core/glib-2.0/glib-2.0/CVE-2021-28153-4.patch @@ -0,0 +1,265 @@ +Backport of: + +From 317b3b587058a05dca95d56dac26568c5b098d33 Mon Sep 17 00:00:00 2001 +From: Philip Withnall <pwithnall@endlessos.org> +Date: Wed, 24 Feb 2021 17:36:07 +0000 +Subject: [PATCH 4/5] glocalfileoutputstream: Fix CREATE_REPLACE_DESTINATION + with symlinks +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +The `G_FILE_CREATE_REPLACE_DESTINATION` flag is equivalent to unlinking +the destination file and re-creating it from scratch. That did +previously work, but in the process the code would call `open(O_CREAT)` +on the file. If the file was a dangling symlink, this would create the +destination file (empty). That’s not an intended side-effect, and has +security implications if the symlink is controlled by a lower-privileged +process. + +Fix that by not opening the destination file if it’s a symlink, and +adjusting the rest of the code to cope with + - the fact that `fd == -1` is not an error iff `is_symlink` is true, + - and that `original_stat` will contain the `lstat()` results for the + symlink now, rather than the `stat()` results for its target (again, + iff `is_symlink` is true). + +This means that the target of the dangling symlink is no longer created, +which was the bug. The symlink itself continues to be replaced (as +before) with the new file — this is the intended behaviour of +`g_file_replace()`. + +The behaviour for non-symlink cases, or cases where the symlink was not +dangling, should be unchanged. + +Includes a unit test. + +Signed-off-by: Philip Withnall <pwithnall@endlessos.org> + +Fixes: #2325 + +Upstream-Status: Backport [https://mirrors.ocf.berkeley.edu/ubuntu/pool/main/g/glib2.0/glib2.0_2.64.6-1~ubuntu20.04.3.debian.tar.xz] +CVE: CVE-2021-28153 +Signed-off-by: Neetika Singh <Neetika.Singh@kpit.com> +Signed-off-by: Ranjitsinh Rathod <ranjitsinh.rathod@kpit.com> + +--- + gio/glocalfileoutputstream.c | 77 ++++++++++++++++++------- + gio/tests/file.c | 108 +++++++++++++++++++++++++++++++++++ + 2 files changed, 163 insertions(+), 22 deletions(-) + +--- a/gio/glocalfileoutputstream.c ++++ b/gio/glocalfileoutputstream.c +@@ -875,16 +875,22 @@ handle_overwrite_open (const char *fi + /* Could be a symlink, or it could be a regular ELOOP error, + * but then the next open will fail too. */ + is_symlink = TRUE; +- fd = g_open (filename, open_flags, mode); ++ if (!replace_destination_set) ++ fd = g_open (filename, open_flags, mode); + } +-#else +- fd = g_open (filename, open_flags, mode); +- errsv = errno; ++#else /* if !O_NOFOLLOW */ + /* This is racy, but we do it as soon as possible to minimize the race */ + is_symlink = g_file_test (filename, G_FILE_TEST_IS_SYMLINK); ++ ++ if (!is_symlink || !replace_destination_set) ++ { ++ fd = g_open (filename, open_flags, mode); ++ errsv = errno; ++ } + #endif + +- if (fd == -1) ++ if (fd == -1 && ++ (!is_symlink || !replace_destination_set)) + { + char *display_name = g_filename_display_name (filename); + g_set_error (error, G_IO_ERROR, +@@ -898,7 +904,14 @@ handle_overwrite_open (const char *fi + #ifdef G_OS_WIN32 + res = GLIB_PRIVATE_CALL (g_win32_fstat) (fd, &original_stat); + #else +- res = fstat (fd, &original_stat); ++ if (!is_symlink) ++ { ++ res = fstat (fd, &original_stat); ++ } ++ else ++ { ++ res = lstat (filename, &original_stat); ++ } + #endif + errsv = errno; + +@@ -917,16 +930,27 @@ handle_overwrite_open (const char *fi + if (!S_ISREG (original_stat.st_mode)) + { + if (S_ISDIR (original_stat.st_mode)) +- g_set_error_literal (error, +- G_IO_ERROR, +- G_IO_ERROR_IS_DIRECTORY, +- _("Target file is a directory")); +- else +- g_set_error_literal (error, ++ { ++ g_set_error_literal (error, ++ G_IO_ERROR, ++ G_IO_ERROR_IS_DIRECTORY, ++ _("Target file is a directory")); ++ goto err_out; ++ } ++ else if (!is_symlink || ++#ifdef S_ISLNK ++ !S_ISLNK (original_stat.st_mode) ++#else ++ FALSE ++#endif ++ ) ++ { ++ g_set_error_literal (error, + G_IO_ERROR, + G_IO_ERROR_NOT_REGULAR_FILE, + _("Target file is not a regular file")); +- goto err_out; ++ goto err_out; ++ } + } + + if (etag != NULL) +@@ -1007,7 +1031,8 @@ handle_overwrite_open (const char *fi + } + } + +- g_close (fd, NULL); ++ if (fd >= 0) ++ g_close (fd, NULL); + *temp_filename = tmp_filename; + return tmpfd; + } +--- a/gio/tests/file.c ++++ b/gio/tests/file.c +@@ -804,6 +804,113 @@ test_replace_cancel (void) + g_object_unref (tmpdir); + } + ++static void ++test_replace_symlink (void) ++{ ++#ifdef G_OS_UNIX ++ gchar *tmpdir_path = NULL; ++ GFile *tmpdir = NULL, *source_file = NULL, *target_file = NULL; ++ GFileOutputStream *stream = NULL; ++ const gchar *new_contents = "this is a test message which should be written to source and not target"; ++ gsize n_written; ++ GFileEnumerator *enumerator = NULL; ++ GFileInfo *info = NULL; ++ gchar *contents = NULL; ++ gsize length = 0; ++ GError *local_error = NULL; ++ ++ g_test_bug ("https://gitlab.gnome.org/GNOME/glib/-/issues/2325"); ++ g_test_summary ("Test that G_FILE_CREATE_REPLACE_DESTINATION doesn’t follow symlinks"); ++ ++ /* Create a fresh, empty working directory. */ ++ tmpdir_path = g_dir_make_tmp ("g_file_replace_symlink_XXXXXX", &local_error); ++ g_assert_no_error (local_error); ++ tmpdir = g_file_new_for_path (tmpdir_path); ++ ++ g_test_message ("Using temporary directory %s", tmpdir_path); ++ g_free (tmpdir_path); ++ ++ /* Create symlink `source` which points to `target`. */ ++ source_file = g_file_get_child (tmpdir, "source"); ++ target_file = g_file_get_child (tmpdir, "target"); ++ g_file_make_symbolic_link (source_file, "target", NULL, &local_error); ++ g_assert_no_error (local_error); ++ ++ /* Ensure that `target` doesn’t exist */ ++ g_assert_false (g_file_query_exists (target_file, NULL)); ++ ++ /* Replace the `source` symlink with a regular file using ++ * %G_FILE_CREATE_REPLACE_DESTINATION, which should replace it *without* ++ * following the symlink */ ++ stream = g_file_replace (source_file, NULL, FALSE /* no backup */, ++ G_FILE_CREATE_REPLACE_DESTINATION, NULL, &local_error); ++ g_assert_no_error (local_error); ++ ++ g_output_stream_write_all (G_OUTPUT_STREAM (stream), new_contents, strlen (new_contents), ++ &n_written, NULL, &local_error); ++ g_assert_no_error (local_error); ++ g_assert_cmpint (n_written, ==, strlen (new_contents)); ++ ++ g_output_stream_close (G_OUTPUT_STREAM (stream), NULL, &local_error); ++ g_assert_no_error (local_error); ++ ++ g_clear_object (&stream); ++ ++ /* At this point, there should still only be one file: `source`. It should ++ * now be a regular file. `target` should not exist. */ ++ enumerator = g_file_enumerate_children (tmpdir, ++ G_FILE_ATTRIBUTE_STANDARD_NAME "," ++ G_FILE_ATTRIBUTE_STANDARD_TYPE, ++ G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS, NULL, &local_error); ++ g_assert_no_error (local_error); ++ ++ info = g_file_enumerator_next_file (enumerator, NULL, &local_error); ++ g_assert_no_error (local_error); ++ g_assert_nonnull (info); ++ ++ g_assert_cmpstr (g_file_info_get_name (info), ==, "source"); ++ g_assert_cmpint (g_file_info_get_file_type (info), ==, G_FILE_TYPE_REGULAR); ++ ++ g_clear_object (&info); ++ ++ info = g_file_enumerator_next_file (enumerator, NULL, &local_error); ++ g_assert_no_error (local_error); ++ g_assert_null (info); ++ ++ g_file_enumerator_close (enumerator, NULL, &local_error); ++ g_assert_no_error (local_error); ++ g_clear_object (&enumerator); ++ ++ /* Double-check that `target` doesn’t exist */ ++ g_assert_false (g_file_query_exists (target_file, NULL)); ++ ++ /* Check the content of `source`. */ ++ g_file_load_contents (source_file, ++ NULL, ++ &contents, ++ &length, ++ NULL, ++ &local_error); ++ g_assert_no_error (local_error); ++ g_assert_cmpstr (contents, ==, new_contents); ++ g_assert_cmpuint (length, ==, strlen (new_contents)); ++ g_free (contents); ++ ++ /* Tidy up. */ ++ g_file_delete (source_file, NULL, &local_error); ++ g_assert_no_error (local_error); ++ ++ g_file_delete (tmpdir, NULL, &local_error); ++ g_assert_no_error (local_error); ++ ++ g_clear_object (&target_file); ++ g_clear_object (&source_file); ++ g_clear_object (&tmpdir); ++#else /* if !G_OS_UNIX */ ++ g_test_skip ("Symlink replacement tests can only be run on Unix") ++#endif ++} ++ + static void + on_file_deleted (GObject *object, + GAsyncResult *result, +@@ -1752,6 +1859,7 @@ main (int argc, char *argv[]) + g_test_add_data_func ("/file/async-create-delete/4096", GINT_TO_POINTER (4096), test_create_delete); + g_test_add_func ("/file/replace-load", test_replace_load); + g_test_add_func ("/file/replace-cancel", test_replace_cancel); ++ g_test_add_func ("/file/replace-symlink", test_replace_symlink); + g_test_add_func ("/file/async-delete", test_async_delete); + #ifdef G_OS_UNIX + g_test_add_func ("/file/copy-preserve-mode", test_copy_preserve_mode); |