Add sigstack handling to Linux ____longjmp_chk on i386.

All other i386 ports need to provide their own versions.
This commit is contained in:
Ulrich Drepper 2009-07-30 21:50:14 -07:00
parent 98b1e6c866
commit da97dfdcfa
4 changed files with 156 additions and 61 deletions

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@ -1,5 +1,11 @@
2009-07-30 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/i386/____longjmp_chk.S: New file.
* sysdeps/i386/____longjmp_chk.S: Remove all code. This is now a file
which always causes a compile error.
* sysdeps/i386/__longjmp.S: Remove bound-checking pointer support.
* sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S: New file. Content
comes from...
* sysdeps/x86_64/____longjmp_chk.S: ...here. This is now a file

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@ -1,45 +1 @@
/* Copyright (C) 2001,2004,2005,2006,2009 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. */
.section .rodata.str1.1,"aMS",@progbits,1
.type longjmp_msg,@object
longjmp_msg:
.string "longjmp causes uninitialized stack frame"
.size longjmp_msg, .-longjmp_msg
#define __longjmp ____longjmp_chk
#ifdef PIC
# define CALL_FAIL movl %ebx, %ecx; \
cfi_register(%ebx,%ecx); \
LOAD_PIC_REG (bx); \
leal longjmp_msg@GOTOFF(%ebx), %eax; \
call __GI___fortify_fail@PLT
#else
# define CALL_FAIL movl $longjmp_msg, %eax; \
call __fortify_fail
#endif
#define CHECK_ESP(reg) \
cmpl reg, %esp; \
jbe .Lok; \
CALL_FAIL; \
.Lok:
#include "__longjmp.S"
#error "OS-specific version needed"

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@ -21,20 +21,11 @@
#include <sysdep.h>
#include <jmpbuf-offsets.h>
#include <asm-syntax.h>
#include <bp-sym.h>
#include <bp-asm.h>
#define PARMS LINKAGE /* no space for saved regs */
#define JBUF PARMS
#define VAL JBUF+PTR_SIZE
.text
ENTRY (BP_SYM (__longjmp))
ENTER
ENTRY (__longjmp)
#ifdef PTR_DEMANGLE
movl JBUF(%esp), %eax /* User's jmp_buf in %eax. */
CHECK_BOUNDS_BOTH_WIDE (%eax, JBUF(%esp), $JB_SIZE)
movl 4(%esp), %eax /* User's jmp_buf in %eax. */
/* Save the return address now. */
movl (JB_PC*4)(%eax), %edx
@ -62,18 +53,17 @@ ENTRY (BP_SYM (__longjmp))
cfi_restore(%edi)
cfi_restore(%ebp)
movl VAL(%esp), %eax /* Second argument is return value. */
movl 8(%esp), %eax /* Second argument is return value. */
movl %ecx, %esp
#else
movl JBUF(%esp), %ecx /* User's jmp_buf in %ecx. */
CHECK_BOUNDS_BOTH_WIDE (%ecx, JBUF(%esp), $JB_SIZE)
movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */
# ifdef CHECK_ESP
movl (JB_SP*4)(%ecx), %eax
CHECK_ESP (%eax)
# endif
movl VAL(%esp), %eax /* Second argument is return value. */
movl 8(%esp), %eax /* Second argument is return value. */
/* Save the return address now. */
movl (JB_PC*4)(%ecx), %edx
/* Restore registers. */
@ -85,4 +75,4 @@ ENTRY (BP_SYM (__longjmp))
#endif
/* Jump to saved PC. */
jmp *%edx
END (BP_SYM (__longjmp))
END (__longjmp)

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@ -0,0 +1,143 @@
/* Copyright (C) 2001,2004,2005,2006,2009 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>
#include <jmpbuf-offsets.h>
#include <asm-syntax.h>
.section .rodata.str1.1,"aMS",@progbits,1
.type longjmp_msg,@object
longjmp_msg:
.string "longjmp causes uninitialized stack frame"
.size longjmp_msg, .-longjmp_msg
#ifdef PIC
# define CALL_FAIL movl %ebx, %ecx; \
cfi_register(%ebx,%ecx); \
LOAD_PIC_REG (bx); \
leal longjmp_msg@GOTOFF(%ebx), %eax; \
call __GI___fortify_fail@PLT
#else
# define CALL_FAIL movl $longjmp_msg, %eax; \
call __fortify_fail
#endif
#define CHECK_ESP(reg) \
cmpl reg, %esp; \
jbe .Lok; \
CALL_FAIL; \
.Lok:
.text
ENTRY (____longjmp_chk)
movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */
/* Save the return address now. */
movl (JB_PC*4)(%ecx), %edx
/* Get the stack pointer. */
movl (JB_SP*4)(%ecx), %edi
cfi_undefined(%edi)
PTR_DEMANGLE (%edx)
PTR_DEMANGLE (%edi)
pushl $0
cfi_adjust_cfa_offset(4)
cmpl %edi, %esp
jbe .Lok
subl $12, %esp
cfi_adjust_cfa_offset(12)
xorl %ebx, %ebx
movl %esp, %ecx
movl $__NR_sigaltstack, %eax
ENTER_KERNEL
movl 4(%esp), %ebx
addl $12, %esp
cfi_adjust_cfa_offset(-12)
movl 8(%esp), %ecx
testl %eax, %eax
jne .Lok
andl $1, %ebx
movl %ebx, (%esp)
.Lok:
cfi_def_cfa(%ecx, 0)
cfi_register(%eip, %edx)
cfi_register(%esp, %edi)
cfi_offset(%ebx, JB_BX*4)
cfi_offset(%esi, JB_SI*4)
cfi_offset(%edi, JB_DI*4)
cfi_offset(%ebp, JB_BP*4)
movl 12(%esp), %eax /* Second argument is return value. */
xchgl %edi, %esp
cfi_restore(%edi)
cmpl %esp, %edi
jnbe .Lcheck
/* Restore registers. */
.Lout: movl (JB_BX*4)(%ecx), %ebx
movl (JB_SI*4)(%ecx), %esi
movl (JB_DI*4)(%ecx), %edi
movl (JB_BP*4)(%ecx), %ebp
cfi_restore(%ebx)
cfi_restore(%esi)
cfi_restore(%edi)
cfi_restore(%ebp)
/* Jump to saved PC. */
jmp *%edx
cfi_def_cfa(%ecx, 0)
cfi_register(%eip, %edx)
cfi_offset(%ebx, JB_BX*4)
cfi_offset(%esi, JB_SI*4)
cfi_offset(%edi, JB_DI*4)
cfi_offset(%ebp, JB_BP*4)
.Lcheck:
cmpl $0, (%edi)
je .Lfail
subl $12, %esp
cfi_adjust_cfa_offset(12)
xorl %ebx, %ebx
movl %esp, %ecx
movl $__NR_sigaltstack, %eax
ENTER_KERNEL
testl $1, 4(%esp)
leal 12(%esp), %esp
movl 8(%edi), %ecx
movl 12(%edi), %eax
cfi_adjust_cfa_offset(-12)
je .Lout
.Lfail: xchgl %edi, %esp
cfi_def_cfa(%esp, 8)
cfi_restore(%esp)
cfi_restore(%ebx)
cfi_restore(%esi)
cfi_undefined(%edi)
cfi_restore(%ebp)
CALL_FAIL
hlt
END (____longjmp_chk)