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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
parent
98b1e6c866
commit
da97dfdcfa
@ -1,5 +1,11 @@
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2009-07-30 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/unix/sysv/linux/i386/____longjmp_chk.S: New file.
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* sysdeps/i386/____longjmp_chk.S: Remove all code. This is now a file
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which always causes a compile error.
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* sysdeps/i386/__longjmp.S: Remove bound-checking pointer support.
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* sysdeps/unix/sysv/linux/x86_64/____longjmp_chk.S: New file. Content
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comes from...
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* sysdeps/x86_64/____longjmp_chk.S: ...here. This is now a file
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@ -1,45 +1 @@
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/* Copyright (C) 2001,2004,2005,2006,2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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.section .rodata.str1.1,"aMS",@progbits,1
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.type longjmp_msg,@object
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longjmp_msg:
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.string "longjmp causes uninitialized stack frame"
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.size longjmp_msg, .-longjmp_msg
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#define __longjmp ____longjmp_chk
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#ifdef PIC
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# define CALL_FAIL movl %ebx, %ecx; \
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cfi_register(%ebx,%ecx); \
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LOAD_PIC_REG (bx); \
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leal longjmp_msg@GOTOFF(%ebx), %eax; \
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call __GI___fortify_fail@PLT
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#else
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# define CALL_FAIL movl $longjmp_msg, %eax; \
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call __fortify_fail
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#endif
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#define CHECK_ESP(reg) \
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cmpl reg, %esp; \
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jbe .Lok; \
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CALL_FAIL; \
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.Lok:
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#include "__longjmp.S"
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#error "OS-specific version needed"
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@ -21,20 +21,11 @@
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#include <sysdep.h>
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#include <jmpbuf-offsets.h>
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#include <asm-syntax.h>
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#include <bp-sym.h>
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#include <bp-asm.h>
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#define PARMS LINKAGE /* no space for saved regs */
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#define JBUF PARMS
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#define VAL JBUF+PTR_SIZE
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.text
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ENTRY (BP_SYM (__longjmp))
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ENTER
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ENTRY (__longjmp)
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#ifdef PTR_DEMANGLE
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movl JBUF(%esp), %eax /* User's jmp_buf in %eax. */
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CHECK_BOUNDS_BOTH_WIDE (%eax, JBUF(%esp), $JB_SIZE)
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movl 4(%esp), %eax /* User's jmp_buf in %eax. */
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/* Save the return address now. */
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movl (JB_PC*4)(%eax), %edx
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@ -62,18 +53,17 @@ ENTRY (BP_SYM (__longjmp))
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cfi_restore(%edi)
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cfi_restore(%ebp)
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movl VAL(%esp), %eax /* Second argument is return value. */
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movl 8(%esp), %eax /* Second argument is return value. */
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movl %ecx, %esp
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#else
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movl JBUF(%esp), %ecx /* User's jmp_buf in %ecx. */
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CHECK_BOUNDS_BOTH_WIDE (%ecx, JBUF(%esp), $JB_SIZE)
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movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */
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# ifdef CHECK_ESP
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movl (JB_SP*4)(%ecx), %eax
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CHECK_ESP (%eax)
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# endif
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movl VAL(%esp), %eax /* Second argument is return value. */
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movl 8(%esp), %eax /* Second argument is return value. */
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/* Save the return address now. */
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movl (JB_PC*4)(%ecx), %edx
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/* Restore registers. */
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@ -85,4 +75,4 @@ ENTRY (BP_SYM (__longjmp))
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#endif
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/* Jump to saved PC. */
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jmp *%edx
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END (BP_SYM (__longjmp))
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END (__longjmp)
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143
sysdeps/unix/sysv/linux/i386/____longjmp_chk.S
Normal file
143
sysdeps/unix/sysv/linux/i386/____longjmp_chk.S
Normal file
@ -0,0 +1,143 @@
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/* Copyright (C) 2001,2004,2005,2006,2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include <jmpbuf-offsets.h>
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#include <asm-syntax.h>
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.section .rodata.str1.1,"aMS",@progbits,1
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.type longjmp_msg,@object
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longjmp_msg:
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.string "longjmp causes uninitialized stack frame"
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.size longjmp_msg, .-longjmp_msg
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#ifdef PIC
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# define CALL_FAIL movl %ebx, %ecx; \
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cfi_register(%ebx,%ecx); \
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LOAD_PIC_REG (bx); \
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leal longjmp_msg@GOTOFF(%ebx), %eax; \
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call __GI___fortify_fail@PLT
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#else
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# define CALL_FAIL movl $longjmp_msg, %eax; \
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call __fortify_fail
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#endif
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#define CHECK_ESP(reg) \
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cmpl reg, %esp; \
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jbe .Lok; \
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CALL_FAIL; \
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.Lok:
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.text
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ENTRY (____longjmp_chk)
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movl 4(%esp), %ecx /* User's jmp_buf in %ecx. */
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/* Save the return address now. */
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movl (JB_PC*4)(%ecx), %edx
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/* Get the stack pointer. */
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movl (JB_SP*4)(%ecx), %edi
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cfi_undefined(%edi)
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PTR_DEMANGLE (%edx)
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PTR_DEMANGLE (%edi)
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pushl $0
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cfi_adjust_cfa_offset(4)
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cmpl %edi, %esp
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jbe .Lok
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subl $12, %esp
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cfi_adjust_cfa_offset(12)
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xorl %ebx, %ebx
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movl %esp, %ecx
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movl $__NR_sigaltstack, %eax
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ENTER_KERNEL
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movl 4(%esp), %ebx
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addl $12, %esp
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cfi_adjust_cfa_offset(-12)
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movl 8(%esp), %ecx
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testl %eax, %eax
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jne .Lok
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andl $1, %ebx
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movl %ebx, (%esp)
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.Lok:
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cfi_def_cfa(%ecx, 0)
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cfi_register(%eip, %edx)
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cfi_register(%esp, %edi)
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cfi_offset(%ebx, JB_BX*4)
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cfi_offset(%esi, JB_SI*4)
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cfi_offset(%edi, JB_DI*4)
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cfi_offset(%ebp, JB_BP*4)
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movl 12(%esp), %eax /* Second argument is return value. */
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xchgl %edi, %esp
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cfi_restore(%edi)
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cmpl %esp, %edi
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jnbe .Lcheck
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/* Restore registers. */
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.Lout: movl (JB_BX*4)(%ecx), %ebx
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movl (JB_SI*4)(%ecx), %esi
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movl (JB_DI*4)(%ecx), %edi
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movl (JB_BP*4)(%ecx), %ebp
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cfi_restore(%ebx)
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cfi_restore(%esi)
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cfi_restore(%edi)
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cfi_restore(%ebp)
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/* Jump to saved PC. */
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jmp *%edx
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cfi_def_cfa(%ecx, 0)
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cfi_register(%eip, %edx)
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cfi_offset(%ebx, JB_BX*4)
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cfi_offset(%esi, JB_SI*4)
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cfi_offset(%edi, JB_DI*4)
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cfi_offset(%ebp, JB_BP*4)
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.Lcheck:
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cmpl $0, (%edi)
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je .Lfail
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subl $12, %esp
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cfi_adjust_cfa_offset(12)
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xorl %ebx, %ebx
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movl %esp, %ecx
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movl $__NR_sigaltstack, %eax
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ENTER_KERNEL
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testl $1, 4(%esp)
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leal 12(%esp), %esp
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movl 8(%edi), %ecx
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movl 12(%edi), %eax
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cfi_adjust_cfa_offset(-12)
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je .Lout
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.Lfail: xchgl %edi, %esp
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cfi_def_cfa(%esp, 8)
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cfi_restore(%esp)
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cfi_restore(%ebx)
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cfi_restore(%esi)
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cfi_undefined(%edi)
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cfi_restore(%ebp)
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CALL_FAIL
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hlt
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END (____longjmp_chk)
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