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Protect numeric conversion against user's locale (fixes #459)

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This commit is contained in:
Jay Berkenbilt 2020-10-21 15:29:28 -04:00
parent ef127001b3
commit 98f6c00dad
9 changed files with 53 additions and 1 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2020-10-21 Jay Berkenbilt <ejb@ql.org>
* Ensure that numeric conversion is not affected by the user's
global locale setting. Fixes #459.
* Add qpdf-<version>-linux-x86_64.zip to the list of built
distributions. This is a simple zip file that contains just the
qpdf executables and the dependent shared libraries that would not

8
README-maintainer
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@ -83,6 +83,14 @@ CODING RULES
* Use QIntC for type conversions -- see casting policy in docs.
* Remember to imbue ostringstreams with std::locale::classic() before
outputting numbers. This protects against the user's global locale
altering otherwise deterministic values. (See github issue #459.)
One could argue that error messages containing numbers should
respect the user's locale, but I think it's more important for
output to be consistent, since the messages in question are not
really targetted at the end user.
* Use QPDF_DLL on all methods that are to be exported in the shared
library/DLL. Use QPDF_DLL_CLASS for all classes whose type
information is needed. This is important for exception classes and

1
TODO
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@ -7,7 +7,6 @@ Candidates for upcoming release
* Open "next" issues
* bugs
* #473: zsh completion with directories
* #459: locale-sensitivity
* #449: internal error with case to reproduce (from pikepdf)
* #444: concatenated stream/whitespace bug
* Non-bugs

5
include/qpdf/QIntC.hh
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@ -29,6 +29,7 @@
#include <limits>
#include <sstream>
#include <cassert>
#include <locale>
#include <type_traits>
// This namespace provides safe integer conversion that detects
@ -67,6 +68,7 @@ namespace QIntC // QIntC = qpdf Integer Conversion
if (i > std::numeric_limits<To>::max())
{
std::ostringstream msg;
msg.imbue(std::locale::classic());
msg << "integer out of range converting " << i
<< " from a "
<< sizeof(From) << "-byte unsigned type to a "
@ -88,6 +90,7 @@ namespace QIntC // QIntC = qpdf Integer Conversion
(i > std::numeric_limits<To>::max()))
{
std::ostringstream msg;
msg.imbue(std::locale::classic());
msg << "integer out of range converting " << i
<< " from a "
<< sizeof(From) << "-byte signed type to a "
@ -111,6 +114,7 @@ namespace QIntC // QIntC = qpdf Integer Conversion
if ((i < 0) || (ii > std::numeric_limits<To>::max()))
{
std::ostringstream msg;
msg.imbue(std::locale::classic());
msg << "integer out of range converting " << i
<< " from a "
<< sizeof(From) << "-byte signed type to a "
@ -134,6 +138,7 @@ namespace QIntC // QIntC = qpdf Integer Conversion
if (i > maxval)
{
std::ostringstream msg;
msg.imbue(std::locale::classic());
msg << "integer out of range converting " << i
<< " from a "
<< sizeof(From) << "-byte unsigned type to a "

1
libqpdf/BufferInputSource.cc
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@ -108,6 +108,7 @@ BufferInputSource::range_check(qpdf_offset_t cur, qpdf_offset_t delta)
((std::numeric_limits<qpdf_offset_t>::max() - cur) < delta))
{
std::ostringstream msg;
msg.imbue(std::locale::classic());
msg << "seeking forward from " << cur
<< " by " << delta
<< " would cause an overflow of the offset type";

1
libqpdf/OffsetInputSource.cc
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@ -47,6 +47,7 @@ OffsetInputSource::seek(qpdf_offset_t offset, int whence)
if (offset > this->max_safe_offset)
{
std::ostringstream msg;
msg.imbue(std::locale::classic());
msg << "seeking to " << offset
<< " offset by " << global_offset
<< " would cause an overflow of the offset type";

1
libqpdf/QPDF.cc
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@ -1220,6 +1220,7 @@ QPDF::processXRefStream(qpdf_offset_t xref_offset, QPDFObjectHandle& xref_obj)
((std::numeric_limits<int>::max() - obj) < chunk_count))
{
std::ostringstream msg;
msg.imbue(std::locale::classic());
msg << "adding " << chunk_count << " to " << obj
<< " while computing index in xref stream would cause"
<< " an integer overflow";

3
libqpdf/QUtil.cc
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@ -21,6 +21,7 @@
#include <string.h>
#include <fcntl.h>
#include <memory>
#include <locale>
#ifndef QPDF_NO_WCHAR_T
# include <cwchar>
#endif
@ -267,6 +268,7 @@ int_to_string_base_internal(T num, int base, int length)
"int_to_string_base called with unsupported base");
}
std::ostringstream buf;
buf.imbue(std::locale::classic());
buf << std::setbase(base) << std::nouppercase << num;
std::string result;
int str_length = QIntC::to_int(buf.str().length());
@ -318,6 +320,7 @@ QUtil::double_to_string(double num, int decimal_places)
decimal_places = 6;
}
std::ostringstream buf;
buf.imbue(std::locale::classic());
buf << std::setprecision(decimal_places) << std::fixed << num;
return buf.str();
}

31
libtests/qutil.cc
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@ -10,6 +10,7 @@
#include <limits.h>
#include <assert.h>
#include <fstream>
#include <locale>
#ifdef _WIN32
# include <io.h>
@ -80,8 +81,38 @@ void test_to_ull(char const* str, unsigned long long wanted, bool error)
test_to_number(str, wanted, error, QUtil::string_to_ull);
}
static void set_locale()
{
try
{
// First try a locale known to put commas in numbers.
std::locale::global(std::locale("en_US.UTF-8"));
}
catch (std::runtime_error&)
{
try
{
// If that fails, fall back to the user's default locale.
std::locale::global(std::locale(""));
}
catch (std::runtime_error& e)
{
// Ignore this error on Windows without MSVC. We get
// enough test coverage on other platforms, and mingw
// seems to have limited locale support (as of
// 2020-10).
#if ! defined(_WIN32) || defined(_MSC_VER)
throw e;
#endif
}
}
}
void string_conversion_test()
{
// Make sure the code produces consistent results even if we load
// a non-C locale.
set_locale();
std::cout << QUtil::int_to_string(16059) << std::endl
<< QUtil::int_to_string(16059, 7) << std::endl
<< QUtil::int_to_string(16059, -7) << std::endl