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Commit Graph

4 Commits

Author SHA1 Message Date
H.J. Lu
f74839702e Add extern_protected_data and set it for x86
Re-apply: commit ca3fe95e46

With copy relocation, address of protected data defined in the shared
library may be external.  This patch adds extern_protected_data and
changes _bfd_elf_symbol_refs_local_p to return false for protected data
if extern_protected_data is true.

This patch will break building shared libraries with protected data
symbols using GCCs older than GCC 5 without the bug fix for

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65248

GCC backport request should be made in the GCC bug report above.

To get correct run-time behavior on Linux, glibc 2.22 or above are
required, which have the bug fix for

https://sourceware.org/bugzilla/show_bug.cgi?id=17711

Backports for glibc 2.21, 2.20, 2.19 and 2.18 are on hjl/pr17711/2.21,
hjl/pr17711/2.20, hjl/pr17711/2.19 and hjl/pr17711/2.18 branches,
respectively, at

https://sourceware.org/git/?p=glibc.git;a=summary

bfd/

	PR ld/pr15228
	PR ld/pr17709
	* elf-bfd.h (elf_backend_data): Add extern_protected_data.
	* elf32-i386.c (elf_backend_extern_protected_data): New.
	Defined to 1.
	* elf64-x86-64.c (elf_backend_extern_protected_data): Likewise.
	* elflink.c (_bfd_elf_adjust_dynamic_copy): Don't error on
	copy relocs against protected symbols if extern_protected_data
	is true.
	(_bfd_elf_symbol_refs_local_p): Don't return true on protected
	non-function symbols if extern_protected_data is true.
	* elfxx-target.h (elf_backend_extern_protected_data): New.
	Default to 0.
	(elfNN_bed): Initialize extern_protected_data with
	elf_backend_extern_protected_data.

ld/testsuite/

	PR ld/pr15228
	PR ld/pr17709
	* ld-i386/i386.exp (i386tests): Add a test for PR ld/17709.
	* ld-i386/pr17709-nacl.rd: New file.
	* ld-i386/pr17709.rd: Likewise.
	* ld-i386/pr17709a.s: Likewise.
	* ld-i386/pr17709b.s: Likewise.
	* ld-i386/protected3.d: Updated.
	* ld-i386/protected3.s: Likewise.
	* ld-x86-64/pr17709-nacl.rd: New file.
	* ld-x86-64/pr17709.rd: Likewise.
	* ld-x86-64/pr17709a.s: Likewise.
	* ld-x86-64/pr17709b.s: Likewise.
	* ld-x86-64/protected3.d: Updated.
	* ld-x86-64/protected3.s: Likewise.
	* ld-x86-64/x86-64.exp (x86_64tests): Add a test for PR ld/17709.
2015-04-10 11:06:34 -07:00
Alan Modra
8d2ea2a80a Revert "Add extern_protected_data and set it for x86"
This reverts commit ca3fe95e46.
2015-04-10 19:16:47 +09:30
H.J. Lu
ca3fe95e46 Add extern_protected_data and set it for x86
With copy relocation, address of protected data defined in the shared
library may be external.  This patch adds extern_protected_data and
changes _bfd_elf_symbol_refs_local_p to return false for protected data
if extern_protected_data is true.

bfd/

	PR ld/pr15228
	PR ld/pr17709
	* elf-bfd.h (elf_backend_data): Add extern_protected_data.
	* elf32-i386.c (elf_backend_extern_protected_data): New.
	Defined to 1.
	* elf64-x86-64.c (elf_backend_extern_protected_data): Likewise.
	* elflink.c (_bfd_elf_adjust_dynamic_copy): Don't error on
	copy relocs against protected symbols if extern_protected_data
	is true.
	(_bfd_elf_symbol_refs_local_p): Don't return true on protected
	non-function symbols if extern_protected_data is true.
	* elfxx-target.h (elf_backend_extern_protected_data): New.
	Default to 0.
	(elfNN_bed): Initialize extern_protected_data with
	elf_backend_extern_protected_data.

ld/testsuite/

	PR ld/pr15228
	PR ld/pr17709
	* ld-i386/i386.exp (i386tests): Add a test for PR ld/17709.
	* ld-i386/pr17709-nacl.rd: New file.
	* ld-i386/pr17709.rd: Likewise.
	* ld-i386/pr17709a.s: Likewise.
	* ld-i386/pr17709b.s: Likewise.
	* ld-i386/protected3.d: Updated.
	* ld-i386/protected3.s: Likewise.
	* ld-x86-64/pr17709-nacl.rd: New file.
	* ld-x86-64/pr17709.rd: Likewise.
	* ld-x86-64/pr17709a.s: Likewise.
	* ld-x86-64/pr17709b.s: Likewise.
	* ld-x86-64/protected3.d: Updated.
	* ld-x86-64/protected3.s: Likewise.
	* ld-x86-64/x86-64.exp (x86_64tests): Add a test for PR ld/17709.
2015-03-05 06:34:53 -08:00
H.J. Lu
41bed6dd8a bfd/
2008-03-16  H.J. Lu  <hongjiu.lu@intel.com>

	PR ld/5789
	PR ld/5943
	* elf32-i386.c  (elf_i386_relocate_section): Issue an error
	for R_386_GOTOFF relocaton against undefined hidden/internal
	symbols when building a shared object.

	* elf64-x86-64.c (elf64_x86_64_relocate_section): Issue an
	error for R_X86_64_PC8/R_X86_64_PC16/R_X86_64_PC32
	relocaton against undefined hidden/internal symbols when
	building a shared object.
	(elf64_x86_64_finish_dynamic_symbol): Return FALSE when symbol
	is referenced locally, but isn't defined in a regular file.

ld/testsuite/

2008-03-16  H.J. Lu  <hongjiu.lu@intel.com>

	PR ld/5789
	PR ld/5943
	* ld-i386/hidden1.d: New.
	* ld-i386/hidden1.s: Likewise.
	* ld-i386/hidden2.d: Likewise.
	* ld-i386/hidden2.s: Likewise.
	* ld-i386/hidden3.d: Likewise.
	* ld-i386/hidden4.s: Likewise.
	* ld-i386/protected1.d: Likewise.
	* ld-i386/protected1.s: Likewise.
	* ld-i386/protected2.d: Likewise.
	* ld-i386/protected2.s: Likewise.
	* ld-i386/protected3.d: Likewise.
	* ld-i386/protected3.s: Likewise.
	* ld-x86-64/hidden1.d: Likewise.
	* ld-x86-64/hidden1.s: Likewise.
	* ld-x86-64/hidden2.d: Likewise.
	* ld-x86-64/hidden2.s: Likewise.
	* ld-x86-64/hidden3.d: Likewise.
	* ld-x86-64/hidden3.s: Likewise.
	* ld-x86-64/protected1.d: Likewise.
	* ld-x86-64/protected1.s: Likewise.
	* ld-x86-64/protected2.d: Likewise.
	* ld-x86-64/protected2.s: Likewise.
	* ld-x86-64/protected3.d: Likewise.
	* ld-x86-64/protected3.s: Likewise.

	* ld-i386/i386.exp: Run hidden1, hidden2, hidden3, protected1,
	protected2 and protected3.
	* ld-x86-64/x86-64.exp: Likewise.
2008-03-16 22:26:23 +00:00