diff options
Diffstat (limited to 'time')
| -rw-r--r-- | time/Makefile | 2 | ||||
| -rw-r--r-- | time/asctime.c | 17 | ||||
| -rw-r--r-- | time/bug-asctime.c | 32 |
3 files changed, 49 insertions, 2 deletions
diff --git a/time/Makefile b/time/Makefile index 1431356..cb4837c 100644 --- a/time/Makefile +++ b/time/Makefile @@ -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 diff --git a/time/asctime.c b/time/asctime.c index f20b311..8ac4aa7 100644 --- a/time/asctime.c +++ b/time/asctime.c @@ -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)), diff --git a/time/bug-asctime.c b/time/bug-asctime.c new file mode 100644 index 0000000..7204e1b --- /dev/null +++ b/time/bug-asctime.c @@ -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" |