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commit 5f36e5c70107ecb59281ef57f9f1c0e37ec3076d
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Thu Sep 23 09:06:49 2021 -0700
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ld.so: Initialize bootstrap_map.l_ld_readonly [BZ #28340]
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1. Define DL_RO_DYN_SECTION to initalize bootstrap_map.l_ld_readonly
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before calling elf_get_dynamic_info to get dynamic info in bootstrap_map,
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2. Define a single
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static inline bool
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dl_relocate_ld (const struct link_map *l)
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{
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/* Don't relocate dynamic section if it is readonly */
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return !(l->l_ld_readonly || DL_RO_DYN_SECTION);
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}
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This updates BZ #28340 fix.
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(cherry picked from commit 2ec99d8c42b2ff1a1231e4df462a0910a9b7fdef)
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diff --git a/elf/rtld.c b/elf/rtld.c
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index 405166d62b34847c..d83ac1bdc40a6081 100644
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--- a/elf/rtld.c
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+++ b/elf/rtld.c
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@@ -548,6 +548,7 @@ _dl_start (void *arg)
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/* Read our own dynamic section and fill in the info array. */
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bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic ();
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+ bootstrap_map.l_ld_readonly = DL_RO_DYN_SECTION;
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elf_get_dynamic_info (&bootstrap_map);
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#if NO_TLS_OFFSET != 0
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diff --git a/sysdeps/generic/dl-relocate-ld.h b/sysdeps/generic/dl-relocate-ld.h
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index 5fae206db9941e97..cfb86c2d6a2394c1 100644
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--- a/sysdeps/generic/dl-relocate-ld.h
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+++ b/sysdeps/generic/dl-relocate-ld.h
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@@ -19,14 +19,7 @@
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#ifndef _DL_RELOCATE_LD_H
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#define _DL_RELOCATE_LD_H
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-/* Return true if dynamic section in the shared library L should be
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- relocated. */
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-
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-static inline bool
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-dl_relocate_ld (const struct link_map *l)
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-{
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- /* Don't relocate dynamic section if it is readonly */
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- return !l->l_ld_readonly;
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-}
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+/* The dynamic section is writable. */
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+#define DL_RO_DYN_SECTION 0
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#endif /* _DL_RELOCATE_LD_H */
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diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
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index ed10953f34b96c49..fcbbf6974827cdf1 100644
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--- a/sysdeps/generic/ldsodefs.h
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+++ b/sysdeps/generic/ldsodefs.h
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@@ -69,6 +69,16 @@ __BEGIN_DECLS
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`ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'. */
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#define ELFW(type) _ElfW (ELF, __ELF_NATIVE_CLASS, type)
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+/* Return true if dynamic section in the shared library L should be
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+ relocated. */
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+
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+static inline bool
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+dl_relocate_ld (const struct link_map *l)
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+{
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+ /* Don't relocate dynamic section if it is readonly */
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+ return !(l->l_ld_readonly || DL_RO_DYN_SECTION);
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+}
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+
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/* All references to the value of l_info[DT_PLTGOT],
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l_info[DT_STRTAB], l_info[DT_SYMTAB], l_info[DT_RELA],
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l_info[DT_REL], l_info[DT_JMPREL], and l_info[VERSYMIDX (DT_VERSYM)]
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diff --git a/sysdeps/mips/dl-relocate-ld.h b/sysdeps/mips/dl-relocate-ld.h
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index 0c18d9a567cad54f..376ad75dd1695fe3 100644
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--- a/sysdeps/mips/dl-relocate-ld.h
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+++ b/sysdeps/mips/dl-relocate-ld.h
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@@ -19,14 +19,7 @@
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#ifndef _DL_RELOCATE_LD_H
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#define _DL_RELOCATE_LD_H
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-/* Return true if dynamic section in the shared library L should be
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- relocated. */
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-
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-static inline bool
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-dl_relocate_ld (const struct link_map *l)
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-{
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- /* Never relocate dynamic section. */
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- return false;
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-}
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+/* The dynamic section is readonly. */
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+#define DL_RO_DYN_SECTION 1
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#endif /* _DL_RELOCATE_LD_H */
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diff --git a/sysdeps/riscv/dl-relocate-ld.h b/sysdeps/riscv/dl-relocate-ld.h
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index 10327454b17a7097..2ab2b8ac6c09af82 100644
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--- a/sysdeps/riscv/dl-relocate-ld.h
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+++ b/sysdeps/riscv/dl-relocate-ld.h
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@@ -19,14 +19,7 @@
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#ifndef _DL_RELOCATE_LD_H
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#define _DL_RELOCATE_LD_H
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-/* Return true if dynamic section in the shared library L should be
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- relocated. */
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-
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-static inline bool
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-dl_relocate_ld (const struct link_map *l)
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-{
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- /* Never relocate dynamic section for ABI compatibility. */
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- return false;
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-}
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+/* The dynamic section is readonly for ABI compatibility. */
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+#define DL_RO_DYN_SECTION 1
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#endif /* _DL_RELOCATE_LD_H */
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