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authorH.J. Lu <hjl.tools@gmail.com>2021-09-16 08:15:29 -0700
committerH.J. Lu <hjl.tools@gmail.com>2021-09-22 11:12:43 -0700
commitb413280cfb16834450f66f554bc0d618bb513851 (patch)
treefda69976f225c3085c1da42c9b9ab191fae6f61f /elf/tst-ro-dynamic.c
parent4eff749e8f06d8f6c5fc8b37299e9e0409ed80ec (diff)
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ld.so: Replace DL_RO_DYN_SECTION with dl_relocate_ld [BZ #28340]
We can't relocate entries in dynamic section if it is readonly:

1. Add a l_ld_readonly field to struct link_map to indicate if dynamic
section is readonly and set it based on p_flags of PT_DYNAMIC segment.
2. Replace DL_RO_DYN_SECTION with dl_relocate_ld to decide if dynamic
section should be relocated.
3. Remove DL_RO_DYN_TEMP_CNT.
4. Don't use a static dynamic section to make readonly dynamic section
in vDSO writable.
5. Remove the temp argument from elf_get_dynamic_info.

This fixes BZ #28340.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'elf/tst-ro-dynamic.c')
-rw-r--r--elf/tst-ro-dynamic.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/elf/tst-ro-dynamic.c b/elf/tst-ro-dynamic.c
new file mode 100644
index 0000000000..3a18f8789a
--- /dev/null
+++ b/elf/tst-ro-dynamic.c
@@ -0,0 +1,31 @@
+/* Test case for DSO with readonly dynamic section.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <support/check.h>
+#include <support/test-driver.h>
+
+extern int foo;
+
+static int
+do_test (void)
+{
+  TEST_COMPARE (foo, -1);
+  return 0;
+}
+
+#include <support/test-driver.c>