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re PR libstdc++/47921 (pbump will overflow when input n is larger than 2G-1) 

2011-02-28  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/47921
	* include/std/streambuf (basic_streambuf<>::__safe_gbump,
	__safe_pbump): Add.
	* include/bits/streambuf.tcc (basic_streambuf<>::xgetn,
	xputn): Use the latter.
	* include/bits/streambuf_iterator.h: Likewise.
	* src/strstream.cc: Likewise.
	* src/streambuf.cc: Likewise.
	* src/compatibility.cc: Likewise.
	* src/istream.cc: Likewise.
	* include/bits/fstream.tcc (basic_filebuf<>::xsgetn): Use setg
	instead of gbump.
	* include/std/sstream (basic_stringbuf<>::_M_pbump): Add.
	* include/bits/sstream.tcc (basic_stringbuf<>::seekoff,
	seekpos, _M_sync): Use setg, setp, and _M_pbump.
	* config/abi/pre/gnu.ver: Tweak.

From-SVN: r170579
This commit is contained in:
Paolo Carlini 2011-02-28 23:50:57 +00:00 committed by Paolo Carlini
parent 6dfef9cca7
commit 1139a7354d
12 changed files with 85 additions and 38 deletions
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19
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,22 @@
2011-02-28 Paolo Carlini <paolo.carlini@oracle.com>
PR libstdc++/47921
* include/std/streambuf (basic_streambuf<>::__safe_gbump,
__safe_pbump): Add.
* include/bits/streambuf.tcc (basic_streambuf<>::xgetn,
xputn): Use the latter.
* include/bits/streambuf_iterator.h: Likewise.
* src/strstream.cc: Likewise.
* src/streambuf.cc: Likewise.
* src/compatibility.cc: Likewise.
* src/istream.cc: Likewise.
* include/bits/fstream.tcc (basic_filebuf<>::xsgetn): Use setg
instead of gbump.
* include/std/sstream (basic_stringbuf<>::_M_pbump): Add.
* include/bits/sstream.tcc (basic_stringbuf<>::seekoff,
seekpos, _M_sync): Use setg, setp, and _M_pbump.
* config/abi/pre/gnu.ver: Tweak.
2011-02-28 Paolo Carlini <paolo.carlini@oracle.com>
* testsuite/20_util/ratio/comparisons/comp3.cc: New.

3
libstdc++-v3/config/abi/pre/gnu.ver
View File

@ -322,7 +322,8 @@ GLIBCXX_3.4 {
_ZNSt15basic_stringbufIcSt11char_traitsIcESaIcEE3strERKSs;
_ZNSt15basic_stringbufIwSt11char_traitsIwESaIwEE3strERKSbIwS1_S2_E;
_ZNSt15basic_stringbufI[cw]St11char_traitsI[cw]ESaI[cw]EE[0-9][t-z]*;
_ZNSt15basic_stringbufI[cw]St11char_traitsI[cw]ESaI[cw]EE[0-9]_M_[a-z]*;
_ZNSt15basic_stringbufI[cw]St11char_traitsI[cw]ESaI[cw]EE[0-9]_M_[a-o]*;
_ZNSt15basic_stringbufI[cw]St11char_traitsI[cw]ESaI[cw]EE[0-9]_M_[q-z]*;
_ZNSt15basic_stringbufI[cw]St11char_traitsI[cw]ESaI[cw]EE[0-9][0-9]_M_[a-z]*;
# std::basic_iostream constructors, destructors

12
libstdc++-v3/include/bits/fstream.tcc
View File

@ -584,14 +584,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
const streamsize __avail = this->egptr() - this->gptr();
if (__avail != 0)
{
if (__avail == 1)
*__s = *this->gptr();
else
traits_type::copy(__s, this->gptr(), __avail);
traits_type::copy(__s, this->gptr(), __avail);
__s += __avail;
this->gbump(__avail);
__ret += __avail;
__n -= __avail;
this->setg(this->eback(), this->gptr() + __avail,
this->egptr());
__ret += __avail;
__n -= __avail;
}
// Need to loop in case of short reads (relatively common

29
libstdc++-v3/include/bits/sstream.tcc
View File

@ -1,7 +1,7 @@
// String based streams -*- C++ -*-
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
// 2006, 2007, 2009, 2010
// 2006, 2007, 2008, 2009, 2010, 2011
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
@ -178,14 +178,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
&& __newoffi >= 0
&& this->egptr() - __beg >= __newoffi)
{
this->gbump((__beg + __newoffi) - this->gptr());
this->setg(this->eback(), this->eback() + __newoffi,
this->egptr());
__ret = pos_type(__newoffi);
}
if ((__testout || __testboth)
&& __newoffo >= 0
&& this->egptr() - __beg >= __newoffo)
{
this->pbump((__beg + __newoffo) - this->pptr());
_M_pbump(this->pbase(), this->epptr(), __newoffo);
__ret = pos_type(__newoffo);
}
}
@ -212,9 +213,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (__testpos)
{
if (__testin)
this->gbump((__beg + __pos) - this->gptr());
this->setg(this->eback(), this->eback() + __pos,
this->egptr());
if (__testout)
this->pbump((__beg + __pos) - this->pptr());
_M_pbump(this->pbase(), this->epptr(), __pos);
__ret = __sp;
}
}
@ -243,8 +245,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
this->setg(__base, __base + __i, __endg);
if (__testout)
{
this->setp(__base, __endp);
this->pbump(__o);
_M_pbump(__base, __endp, __o);
// egptr() always tracks the string end. When !__testin,
// for the correct functioning of the streambuf inlines
// the other get area pointers are identical.
@ -253,6 +254,20 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
}
template <class _CharT, class _Traits, class _Alloc>
void
basic_stringbuf<_CharT, _Traits, _Alloc>::
_M_pbump(char_type* __pbeg, char_type* __pend, off_type __off)
{
this->setp(__pbeg, __pend);
while (__off > __gnu_cxx::__numeric_traits<int>::__max)
{
this->pbump(__gnu_cxx::__numeric_traits<int>::__max);
__off -= __gnu_cxx::__numeric_traits<int>::__max;
}
this->pbump(__off);
}
// Inhibit implicit instantiations for required instantiations,
// which are defined via explicit instantiations elsewhere.
// NB: This syntax is a GNU extension.

6
libstdc++-v3/include/bits/streambuf.tcc
View File

@ -1,7 +1,7 @@
// Stream buffer classes -*- C++ -*-
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
// 2006, 2009, 2010 Free Software Foundation, Inc.
// 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
@ -57,7 +57,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
traits_type::copy(__s, this->gptr(), __len);
__ret += __len;
__s += __len;
this->gbump(__len);
this->__safe_gbump(__len);
}
if (__ret < __n)
@ -91,7 +91,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
traits_type::copy(this->pptr(), __s, __len);
__ret += __len;
__s += __len;
this->pbump(__len);
this->__safe_pbump(__len);
}
if (__ret < __n)

6
libstdc++-v3/include/bits/streambuf_iterator.h
View File

@ -1,7 +1,7 @@
// Streambuf iterators
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
// 2006, 2007, 2009, 2010
// 2006, 2007, 2009, 2010, 2011
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
@ -339,7 +339,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (__n > 1)
{
traits_type::copy(__result, __sb->gptr(), __n);
__sb->gbump(__n);
__sb->__safe_gbump(__n);
__result += __n;
__c = __sb->underflow();
}
@ -379,7 +379,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__n, __val);
if (__p)
__n = __p - __sb->gptr();
__sb->gbump(__n);
__sb->__safe_gbump(__n);
__c = __sb->sgetc();
}
else

5
libstdc++-v3/include/std/sstream
View File

@ -241,6 +241,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
this->setg(this->pptr(), this->pptr(), this->pptr());
}
}
// Works around the issue with pbump, part of the protected
// interface of basic_streambuf, taking just an int.
void
_M_pbump(char_type* __pbeg, char_type* __pend, off_type __off);
};

7
libstdc++-v3/include/std/streambuf
View File

@ -769,6 +769,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
#endif
// Also used by specializations for char and wchar_t in src.
void
__safe_gbump(streamsize __n) { _M_in_cur += __n; }
void
__safe_pbump(streamsize __n) { _M_out_cur += __n; }
private:
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// Side effect of DR 50.

4
libstdc++-v3/src/compatibility.cc
View File

@ -86,7 +86,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
streamsize(__n - _M_gcount));
if (__size > 1)
{
__sb->gbump(__size);
__sb->__safe_gbump(__size);
_M_gcount += __size;
__c = __sb->sgetc();
}
@ -157,7 +157,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
streamsize(__n - _M_gcount));
if (__size > 1)
{
__sb->gbump(__size);
__sb->__safe_gbump(__size);
_M_gcount += __size;
__c = __sb->sgetc();
}

16
libstdc++-v3/src/istream.cc
View File

@ -67,7 +67,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__size = __p - __sb->gptr();
traits_type::copy(__s, __sb->gptr(), __size);
__s += __size;
__sb->gbump(__size);
__sb->__safe_gbump(__size);
_M_gcount += __size;
__c = __sb->sgetc();
}
@ -145,7 +145,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__cdelim);
if (__p)
__size = __p - __sb->gptr();
__sb->gbump(__size);
__sb->__safe_gbump(__size);
_M_gcount += __size;
__c = __sb->sgetc();
}
@ -239,7 +239,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
- __sb->gptr());
__traits_type::copy(__s, __sb->gptr(), __size);
__s += __size;
__sb->gbump(__size);
__sb->__safe_gbump(__size);
__extracted += __size;
__c = __sb->sgetc();
}
@ -318,7 +318,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__sb->gptr() + __size)
- __sb->gptr());
__str.append(__sb->gptr(), __size);
__sb->gbump(__size);
__sb->__safe_gbump(__size);
__extracted += __size;
__c = __sb->sgetc();
}
@ -397,7 +397,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (__p)
__size = __p - __sb->gptr();
__str.append(__sb->gptr(), __size);
__sb->gbump(__size);
__sb->__safe_gbump(__size);
__extracted += __size;
__c = __sb->sgetc();
}
@ -474,7 +474,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__size = __p - __sb->gptr();
traits_type::copy(__s, __sb->gptr(), __size);
__s += __size;
__sb->gbump(__size);
__sb->__safe_gbump(__size);
_M_gcount += __size;
__c = __sb->sgetc();
}
@ -552,7 +552,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__cdelim);
if (__p)
__size = __p - __sb->gptr();
__sb->gbump(__size);
__sb->__safe_gbump(__size);
_M_gcount += __size;
__c = __sb->sgetc();
}
@ -643,7 +643,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (__p)
__size = __p - __sb->gptr();
__str.append(__sb->gptr(), __size);
__sb->gbump(__size);
__sb->__safe_gbump(__size);
__extracted += __size;
__c = __sb->sgetc();
}

7
libstdc++-v3/src/streambuf.cc
View File

@ -1,6 +1,7 @@
// Stream buffer classes -*- C++ -*-
// Copyright (C) 2004, 2005, 2006, 2009 Free Software Foundation, Inc.
// Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
@ -47,7 +48,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (__n > 1)
{
const streamsize __wrote = __sbout->sputn(__sbin->gptr(), __n);
__sbin->gbump(__wrote);
__sbin->__safe_gbump(__wrote);
__ret += __wrote;
if (__wrote < __n)
{
@ -87,7 +88,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (__n > 1)
{
const streamsize __wrote = __sbout->sputn(__sbin->gptr(), __n);
__sbin->gbump(__wrote);
__sbin->__safe_gbump(__wrote);
__ret += __wrote;
if (__wrote < __n)
{

9
libstdc++-v3/src/strstream.cc
View File

@ -1,6 +1,7 @@
// strstream definitions -*- C++ -*-
// Copyright (C) 2001, 2002, 2003, 2005, 2009 Free Software Foundation
// Copyright (C) 2001, 2002, 2003, 2005, 2009, 2010, 2011
// Free Software Foundation
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
@ -161,7 +162,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
setp(buf, buf + new_size);
pbump(old_size);
__safe_pbump(old_size);
if (reposition_get)
setg(buf, buf + old_get_offset, buf +
@ -271,12 +272,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (seeklow + off < pbase())
{
setp(seeklow, epptr());
pbump(off);
__safe_pbump(off);
}
else
{
setp(pbase(), epptr());
pbump(off - (pbase() - seeklow));
__safe_pbump(off - (pbase() - seeklow));
}
}
if (do_get)