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[BZ #1459]

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* time/asctime.c (__asctime_r): Check for tm_year computation to
	overflow and fail in this case.
	* time/Makefile (tests): Add bug-asctime.
	* time/bug-asctime.c: New file.
This commit is contained in:
Ulrich Drepper 2005-10-14 14:10:20 +00:00
parent 93c6cb8b8d
commit 576c845148
4 changed files with 55 additions and 2 deletions
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6
ChangeLog
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@ -1,5 +1,11 @@
2005-10-14 Ulrich Drepper <drepper@redhat.com>
[BZ #1459]
* time/asctime.c (__asctime_r): Check for tm_year computation to
overflow and fail in this case.
* time/Makefile (tests): Add bug-asctime.
* time/bug-asctime.c: New file.
[BZ #1458]
* sysdeps/unix/sysv/linux/i386/bits/mman.h: Define MREMAP_FIXED.
* sysdeps/unix/sysv/linux/ia64/bits/mman.h: Likewise.

2
time/Makefile
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@ -35,7 +35,7 @@ distribute := datemsk
tests := test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
tst-getdate tst-mktime tst-mktime2 tst-ftime_l tst-strftime \
tst-mktime3 tst-strptime2
tst-mktime3 tst-strptime2 bug-asctime
include ../Rules

17
time/asctime.c
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@ -1,4 +1,5 @@
/* Copyright (C) 1991,1993,1995-1997,2000,2002 Free Software Foundation, Inc.
/* Copyright (C) 1991,1993,1995-1997,2000,2002,2005
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
@ -18,6 +19,7 @@
#include "../locale/localeinfo.h"
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <time.h>
@ -47,6 +49,19 @@ __asctime_r (const struct tm *tp, char *buf)
return NULL;
}
/* We limit the size of the year which can be printed. Using the %d
format specifier used the addition of 1900 would overflow the
number and a negative vaue is printed. For some architectures we
could in theory use %ld or an evern larger integer format but
this would mean the output needs more space. This would not be a
problem if the 'asctime_r' interface would be defined sanely and
a buffer size would be passed. */
if (__builtin_expect (tp->tm_year > INT_MAX - 1900, 0))
{
__set_errno (EOVERFLOW);
return NULL;
}
if (sprintf (buf, format,
(tp->tm_wday < 0 || tp->tm_wday >= 7 ?
"???" : ab_day_name (tp->tm_wday)),

32
time/bug-asctime.c Normal file
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@ -0,0 +1,32 @@
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <time.h>
static int
do_test (void)
{
int result = 0;
time_t t = time (NULL);
struct tm *tp = localtime (&t);
tp->tm_year = INT_MAX;
errno = 0;
char *s = asctime (tp);
if (s != NULL || errno != EOVERFLOW)
{
puts ("asctime did not fail correctly");
result = 1;
}
char buf[1000];
s = asctime_r (tp, buf);
if (s != NULL || errno != EOVERFLOW)
{
puts ("asctime_r did not fail correctly");
result = 1;
}
return result;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"