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* elf/Versions [GLIBC_PRIVATE]: Export __pointer_chk_guard if defined.

Browse Source 
* elf/rtld.c: Define __pointer_chk_guard_local and if necessary
	__pointer_chk_guard.
	(_rtld_global_ro): Initialize _dl_pointer_guard.
	(dl_main): Initialize __pointer_chk_guard_local and either
	__pointer_chk_guard or TLS value if necessary.
	(process_envvars): Recognize and handle LD_POINTER_GUARD.
	* sysdeps/generic/ldsodefs.h (rtld_global_ro): Add _dl_pointer_guard.
	* sysdeps/i386/__longjmp.S: Use PTR_DEMANGLE for PC if defined.
	* sysdeps/x86_64/__longjmp.S: Likewise.
	* sysdeps/i386/bsd-_setjmp.S: Use PTR_MANGLE for PC if defined.
	* sysdeps/i386/bsd-_setjmp.S: Likewise.
	* sysdeps/i386/setjmp.S: Likewise.
	[IS_IN_rtld]: Avoid call to __sigjmp_save.
	* sysdeps/i386/setjmp.S: Likewise.
	* sysdeps/unix/sysv/linux/i386/sysdep.h: Define PTR_MANGLE and
	PTR_DEMANGLE.
	* sysdeps/unix/sysv/linux/x86_64/sysdep.h: Likewise.

	* sysdeps/i386/elf/setjmp.S: Removed.
	* sysdeps/i386/elf/bsd-setjmp.S: Removed.
This commit is contained in:
Ulrich Drepper 2005-12-18 06:58:22 +00:00
parent 8292f6fc71
commit 827b70873b
20 changed files with 160 additions and 162 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
ChangeLog
View File

@ -1,5 +1,27 @@
2005-12-17 Ulrich Drepper <drepper@redhat.com>
* elf/Versions [GLIBC_PRIVATE]: Export __pointer_chk_guard if defined.
* elf/rtld.c: Define __pointer_chk_guard_local and if necessary
__pointer_chk_guard.
(_rtld_global_ro): Initialize _dl_pointer_guard.
(dl_main): Initialize __pointer_chk_guard_local and either
__pointer_chk_guard or TLS value if necessary.
(process_envvars): Recognize and handle LD_POINTER_GUARD.
* sysdeps/generic/ldsodefs.h (rtld_global_ro): Add _dl_pointer_guard.
* sysdeps/i386/__longjmp.S: Use PTR_DEMANGLE for PC if defined.
* sysdeps/x86_64/__longjmp.S: Likewise.
* sysdeps/i386/bsd-_setjmp.S: Use PTR_MANGLE for PC if defined.
* sysdeps/i386/bsd-_setjmp.S: Likewise.
* sysdeps/i386/setjmp.S: Likewise.
[IS_IN_rtld]: Avoid call to __sigjmp_save.
* sysdeps/i386/setjmp.S: Likewise.
* sysdeps/unix/sysv/linux/i386/sysdep.h: Define PTR_MANGLE and
PTR_DEMANGLE.
* sysdeps/unix/sysv/linux/x86_64/sysdep.h: Likewise.
* sysdeps/i386/elf/setjmp.S: Removed.
* sysdeps/i386/elf/bsd-setjmp.S: Removed.
* elf/dl-error.c (_dl_catch_error): Use __sigsetgjmp instead of
setjmp.
* elf/dl-error.c (_dl_signal_error): Use __longjmp instead of longjmp.

2
elf/Versions
View File

@ -60,5 +60,7 @@ ld {
_dl_make_stack_executable;
# Only here for gdb while a better method is developed.
_dl_debug_state;
# Pointer protection.
__pointer_chk_guard;
}
}

32
elf/rtld.c
View File

@ -90,6 +90,15 @@ INTDEF(_dl_argv)
uintptr_t __stack_chk_guard attribute_relro;
#endif
/* Only exported for architectures that don't store the pointer guard
value in thread local area. */
uintptr_t __pointer_chk_guard_local
attribute_relro attribute_hidden __attribute__ ((nocommon));
#ifndef THREAD_SET_POINTER_GUARD
strong_alias (__pointer_chk_guard_local, __pointer_chk_guard)
#endif
/* List of auditing DSOs. */
static struct audit_list
{
@ -142,6 +151,7 @@ struct rtld_global_ro _rtld_global_ro attribute_relro =
._dl_hwcap_mask = HWCAP_IMPORTANT,
._dl_lazy = 1,
._dl_fpu_control = _FPU_DEFAULT,
._dl_pointer_guard = 1,
/* Function pointers. */
._dl_debug_printf = _dl_debug_printf,
@ -1823,6 +1833,20 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
__stack_chk_guard = stack_chk_guard;
#endif
/* Set up the pointer guard as well, if necessary. */
if (GLRO(dl_pointer_guard))
{
// XXX If it is cheap, we should use a separate value.
uintptr_t pointer_chk_guard;
hp_timing_t now;
HP_TIMING_NOW (now);
pointer_chk_guard = stack_chk_guard ^ now;
#ifdef THREAD_SET_POINTER_GUARD
THREAD_SET_POINTER_GUARD (pointer_chk_guard);
#endif
__pointer_chk_guard_local = pointer_chk_guard;
}
if (__builtin_expect (mode, normal) != normal)
{
/* We were run just to list the shared libraries. It is
@ -2575,7 +2599,13 @@ process_envvars (enum mode *modep)
#endif
if (!INTUSE(__libc_enable_secure)
&& memcmp (envline, "USE_LOAD_BIAS", 13) == 0)
GLRO(dl_use_load_bias) = envline[14] == '1' ? -1 : 0;
{
GLRO(dl_use_load_bias) = envline[14] == '1' ? -1 : 0;
break;
}
if (memcmp (envline, "POINTER_GUARD", 13) == 0)
GLRO(dl_pointer_guard) = envline[14] == '0';
break;
case 14:

10
nptl/ChangeLog
View File

@ -1,3 +1,13 @@
2005-12-17 Ulrich Drepper <drepper@redhat.com>
* pthread_create.c (__pthread_create_2_1): Use
THREAD_COPY_POINTER_GUARD if available.
* sysdeps/i386/tcb-offsets.sym: Add POINTER_GUARD.
* sysdeps/x86_64/tcb-offsets.sym: Likewise.
* sysdeps/i386/tls.h (tcbhead_t): Add pointer_guard.
Define THREAD_SET_POINTER_GUARD and THREAD_COPY_POINTER_GUARD.
* sysdeps/x86_64/tls.h: Likewise.
2005-12-15 Roland McGrath <roland@redhat.com>
* sysdeps/unix/sysv/linux/mq_notify.c: Don't use sysdeps/generic.

5
nptl/pthread_create.c
View File

@ -415,6 +415,11 @@ __pthread_create_2_1 (newthread, attr, start_routine, arg)
THREAD_COPY_STACK_GUARD (pd);
#endif
/* Copy the pointer guard value. */
#ifdef THREAD_COPY_POINTER_GUARD
THREAD_COPY_POINTER_GUARD (pd);
#endif
/* Determine scheduling parameters for the thread. */
if (attr != NULL
&& __builtin_expect ((iattr->flags & ATTR_FLAG_NOTINHERITSCHED) != 0, 0)

1
nptl/sysdeps/i386/tcb-offsets.sym
View File

@ -11,3 +11,4 @@ SYSINFO_OFFSET offsetof (tcbhead_t, sysinfo)
CLEANUP offsetof (struct pthread, cleanup)
CLEANUP_PREV offsetof (struct _pthread_cleanup_buffer, __prev)
MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock)
POINTER_GUARD offsetof (tcbhead_t, pointer_guard)

9
nptl/sysdeps/i386/tls.h
View File

@ -50,6 +50,7 @@ typedef struct
int multiple_threads;
uintptr_t sysinfo;
uintptr_t stack_guard;
uintptr_t pointer_guard;
} tcbhead_t;
# define TLS_MULTIPLE_THREADS_IN_TCB 1
@ -425,6 +426,14 @@ union user_desc_init
= THREAD_GETMEM (THREAD_SELF, header.stack_guard))
/* Set the pointer guard field in the TCB head. */
#define THREAD_SET_POINTER_GUARD(value) \
THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
#define THREAD_COPY_POINTER_GUARD(descr) \
((descr)->header.pointer_guard \
= THREAD_GETMEM (THREAD_SELF, header.pointer_guard))
#endif /* __ASSEMBLER__ */
#endif /* tls.h */

1
nptl/sysdeps/x86_64/tcb-offsets.sym
View File

@ -10,3 +10,4 @@ CLEANUP offsetof (struct pthread, cleanup)
CLEANUP_PREV offsetof (struct _pthread_cleanup_buffer, __prev)
MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock)
MULTIPLE_THREADS_OFFSET offsetof (tcbhead_t, multiple_threads)
POINTER_GUARD offsetof (tcbhead_t, pointer_guard)

10
nptl/sysdeps/x86_64/tls.h
View File

@ -49,6 +49,7 @@ typedef struct
int multiple_threads;
uintptr_t sysinfo;
uintptr_t stack_guard;
uintptr_t pointer_guard;
} tcbhead_t;
#else /* __ASSEMBLER__ */
@ -329,6 +330,15 @@ typedef struct
((descr)->header.stack_guard \
= THREAD_GETMEM (THREAD_SELF, header.stack_guard))
/* Set the pointer guard field in the TCB head. */
#define THREAD_SET_POINTER_GUARD(value) \
THREAD_SETMEM (THREAD_SELF, header.pointer_guard, value)
#define THREAD_COPY_POINTER_GUARD(descr) \
((descr)->header.pointer_guard \
= THREAD_GETMEM (THREAD_SELF, header.pointer_guard))
#endif /* __ASSEMBLER__ */
#endif /* tls.h */

3
sysdeps/generic/ldsodefs.h
View File

@ -623,6 +623,9 @@ struct rtld_global_ro
/* Expected cache ID. */
EXTERN int _dl_correct_cache_id;
/* 0 if internal pointer values should not be guarded, 1 if they should. */
EXTERN int _dl_pointer_guard;
/* Mask for hardware capabilities that are available. */
EXTERN uint64_t _dl_hwcap;

5
sysdeps/i386/__longjmp.S
View File

@ -1,5 +1,5 @@
/* longjmp for i386.
Copyright (C) 1995,1996,1997,1998,2000,2002 Free Software Foundation, Inc.
Copyright (C) 1995-1998,2000,2002,2005 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
@ -44,6 +44,9 @@ ENTRY (BP_SYM (__longjmp))
movl (JB_DI*4)(%ecx), %edi
movl (JB_BP*4)(%ecx), %ebp
movl (JB_SP*4)(%ecx), %esp
#ifdef PTR_DEMANGLE
PTR_DEMANGLE (%edx)
#endif
/* Jump to saved PC. */
jmp *%edx
END (BP_SYM (__longjmp))

5
sysdeps/i386/bsd-_setjmp.S
View File

@ -1,5 +1,5 @@
/* BSD `_setjmp' entry point to `sigsetjmp (..., 0)'. i386 version.
Copyright (C) 1994-1997,2000,2001,2002 Free Software Foundation, Inc.
Copyright (C) 1994-1997,2000-2002,2005 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
@ -46,6 +46,9 @@ ENTRY (BP_SYM (_setjmp))
leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */
movl %ecx, (JB_SP*4)(%edx)
movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */
#ifdef PTR_MANGLE
PTR_MANGLE (%ecx)
#endif
movl %ecx, (JB_PC*4)(%edx)
LEAVE
movl %ebp, (JB_BP*4)(%edx) /* Save caller's frame pointer. */

7
sysdeps/i386/bsd-setjmp.S
View File

@ -28,6 +28,10 @@
#include "bp-sym.h"
#include "bp-asm.h"
#define PARMS LINKAGE /* no space for saved regs */
#define JMPBUF PARMS
#define SIGMSK JMPBUF+PTR_SIZE
ENTRY (BP_SYM (setjmp))
/* Note that we have to use a non-exported symbol in the next
jump since otherwise gas will emit it as a jump through the
@ -44,6 +48,9 @@ ENTRY (BP_SYM (setjmp))
leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */
movl %ecx, (JB_SP*4)(%eax)
movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */
#ifdef PTR_MANGLE
PTR_MANGLE (%ecx)
#endif
movl %ecx, (JB_PC*4)(%eax)
LEAVE /* pop frame pointer to prepare for tail-call. */
movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */

82
sysdeps/i386/elf/bsd-setjmp.S
View File

@ -1,82 +0,0 @@
/* BSD `setjmp' entry point to `sigsetjmp (..., 1)'. i386 version.
Copyright (C) 1995-1997,2000-2003,2005 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#define _ASM
#define _SETJMP_H
#include <bits/setjmp.h>
#include "bp-sym.h"
#include "bp-asm.h"
#define PARMS LINKAGE /* no space for saved regs */
#define JMPBUF PARMS
#define SIGMSK JMPBUF+PTR_SIZE
ENTRY (BP_SYM (setjmp))
/* Note that we have to use a non-exported symbol in the next
jump since otherwise gas will emit it as a jump through the
PLT which is what we cannot use here. */
ENTER
movl JMPBUF(%esp), %eax
CHECK_BOUNDS_BOTH_WIDE (%eax, JMPBUF(%esp), $JB_SIZE)
/* Save registers. */
movl %ebx, (JB_BX*4)(%eax)
movl %esi, (JB_SI*4)(%eax)
movl %edi, (JB_DI*4)(%eax)
leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */
movl %ecx, (JB_SP*4)(%eax)
movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */
movl %ecx, (JB_PC*4)(%eax)
LEAVE /* pop frame pointer to prepare for tail-call. */
movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */
/* Call __sigjmp_save. */
pushl $1
cfi_adjust_cfa_offset (4)
pushl 8(%esp)
cfi_adjust_cfa_offset (4)
#ifdef PIC
/* We cannot use the PLT, because it requires that %ebx be set, but
we can't save and restore our caller's value. Instead, we do an
indirect jump through the GOT, using for the temporary register
%ecx, which is call-clobbered. */
call __i686.get_pc_thunk.cx
addl $_GLOBAL_OFFSET_TABLE_, %ecx
leal C_SYMBOL_NAME (BP_SYM (__sigjmp_save)@GOTOFF)(%ecx), %ecx
call *%ecx
#else
call BP_SYM (__sigjmp_save)
#endif
popl %ecx
cfi_adjust_cfa_offset (-4)
popl %edx
cfi_adjust_cfa_offset (-4)
ret
END (BP_SYM (setjmp))
.section .gnu.linkonce.t.__i686.get_pc_thunk.cx,"ax",@progbits
.globl __i686.get_pc_thunk.cx
.hidden __i686.get_pc_thunk.cx
.type __i686.get_pc_thunk.cx,@function
__i686.get_pc_thunk.cx:
movl (%esp), %ecx
ret
.size __i686.get_pc_thunk.cx, . - __i686.get_pc_thunk.cx

70
sysdeps/i386/elf/setjmp.S
View File

@ -1,70 +0,0 @@
/* setjmp for i386, ELF version.
Copyright (C) 1995-1997,2000,2001,2002,2003 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#define _ASM
#define _SETJMP_H
#include <bits/setjmp.h>
#include "bp-sym.h"
#include "bp-asm.h"
#define PARMS LINKAGE /* no space for saved regs */
#define JMPBUF PARMS
#define SIGMSK JMPBUF+PTR_SIZE
ENTRY (BP_SYM (__sigsetjmp))
ENTER
movl JMPBUF(%esp), %eax
CHECK_BOUNDS_BOTH_WIDE (%eax, JMPBUF(%esp), $JB_SIZE)
/* Save registers. */
movl %ebx, (JB_BX*4)(%eax)
movl %esi, (JB_SI*4)(%eax)
movl %edi, (JB_DI*4)(%eax)
leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */
movl %ecx, (JB_SP*4)(%eax)
movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */
movl %ecx, (JB_PC*4)(%eax)
LEAVE /* pop frame pointer to prepare for tail-call. */
movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */
/* Make a tail call to __sigjmp_save; it takes the same args. */
#ifdef PIC
/* We cannot use the PLT, because it requires that %ebx be set, but
we can't save and restore our caller's value. Instead, we do an
indirect jump through the GOT, using for the temporary register
%ecx, which is call-clobbered. */
call __i686.get_pc_thunk.cx
addl $_GLOBAL_OFFSET_TABLE_, %ecx
leal C_SYMBOL_NAME (BP_SYM (__sigjmp_save)@GOTOFF)(%ecx), %ecx
jmp *%ecx
#else
jmp BP_SYM (__sigjmp_save)
#endif
END (BP_SYM (__sigsetjmp))
.section .gnu.linkonce.t.__i686.get_pc_thunk.cx,"ax",@progbits
.globl __i686.get_pc_thunk.cx
.hidden __i686.get_pc_thunk.cx
.type __i686.get_pc_thunk.cx,@function
__i686.get_pc_thunk.cx:
movl (%esp), %ecx
ret
.size __i686.get_pc_thunk.cx, . - __i686.get_pc_thunk.cx

13
sysdeps/i386/setjmp.S
View File

@ -1,5 +1,5 @@
/* setjmp for i386.
Copyright (C) 1995, 1996, 1997, 2000, 2001 Free Software Foundation, Inc.
Copyright (C) 1995,1996,1997,2000,2001,2005 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
@ -42,10 +42,19 @@ ENTRY (BP_SYM (__sigsetjmp))
leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */
movl %ecx, (JB_SP*4)(%eax)
movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */
#ifdef PTR_MANGLE
PTR_MANGLE (%ecx)
#endif
movl %ecx, (JB_PC*4)(%eax)
LEAVE /* pop frame pointer to prepare for tail-call. */
movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */
#if defined NOT_IN_libc && defined IS_IN_rtld
/* In ld.so we never save the signal mask. */
xorl %eax, %eax
ret
#else
/* Make a tail call to __sigjmp_save; it takes the same args. */
jmp BP_SYM (__sigjmp_save)
jmp __sigjmp_save
#endif
END (BP_SYM (__sigsetjmp))

11
sysdeps/unix/sysv/linux/i386/sysdep.h
View File

@ -558,4 +558,15 @@ asm (".L__X'%ebx = 1\n\t"
#endif /* __ASSEMBLER__ */
/* Pointer mangling support. */
#if defined NOT_IN_libc && defined IS_IN_rtld
/* We cannot use the thread descriptor because in ld.so we use setjmp
earlier than the descriptor is initialized. Using a global variable
is too complicated here since we have no PC-relative addressing mode. */
#else
# define PTR_MANGLE(reg) xorl %gs:POINTER_GUARD, reg
# define PTR_DEMANGLE(reg) PTR_MANGLE (reg)
#endif
#endif /* linux/i386/sysdep.h */

12
sysdeps/unix/sysv/linux/x86_64/sysdep.h
View File

@ -311,4 +311,16 @@
#endif /* __ASSEMBLER__ */
/* Pointer mangling support. */
#if defined NOT_IN_libc && defined IS_IN_rtld
/* We cannot use the thread descriptor because in ld.so we use setjmp
earlier than the descriptor is initialized. */
# define PTR_MANGLE(reg) xorq __pointer_chk_guard_local(%rip), reg
# define PTR_DEMANGLE(reg) PTR_MANGLE (reg)
#else
# define PTR_MANGLE(reg) xorq %fs:POINTER_GUARD, reg
# define PTR_DEMANGLE(reg) PTR_MANGLE (reg)
#endif
#endif /* linux/x86_64/sysdep.h */

5
sysdeps/x86_64/__longjmp.S
View File

@ -1,4 +1,4 @@
/* Copyright (C) 2001, 2004 Free Software Foundation, Inc.
/* Copyright (C) 2001, 2004, 2005 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
@ -50,5 +50,8 @@ ENTRY(__longjmp)
mov %esi, %eax
movq (JB_PC*8)(%rdi),%rdx
movq (JB_RSP*8)(%rdi),%rsp
#ifdef PTR_DEMANGLE
PTR_DEMANGLE (%rdx)
#endif
jmpq *%rdx
END (BP_SYM (__longjmp))

17
sysdeps/x86_64/setjmp.S
View File

@ -1,5 +1,5 @@
/* setjmp for x86-64.
Copyright (C) 2001, 2003 Free Software Foundation, Inc.
Copyright (C) 2001, 2003, 2005 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
@ -34,13 +34,22 @@ ENTRY (__sigsetjmp)
leaq 8(%rsp), %rdx /* Save SP as it will be after we return. */
movq %rdx, (JB_RSP*8)(%rdi)
movq (%rsp), %rax /* Save PC we are returning to now. */
#ifdef PTR_MANGLE
PTR_MANGLE (%rax)
#endif
movq %rax, (JB_PC*8)(%rdi)
/* Make a tail call to __sigjmp_save; it takes the same args. */
#ifdef PIC
jmp C_SYMBOL_NAME (BP_SYM (__sigjmp_save))@PLT
#if defined NOT_IN_libc && defined IS_IN_rtld
/* In ld.so we never save the signal mask. */
xorl %eax, %eax
retq
#else
/* Make a tail call to __sigjmp_save; it takes the same args. */
# ifdef PIC
jmp C_SYMBOL_NAME (BP_SYM (__sigjmp_save))@PLT
# else
jmp BP_SYM (__sigjmp_save)
# endif
#endif
END (BP_SYM (__sigsetjmp))
hidden_def (__sigsetjmp)