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Don't accept exp char without preceding digits in scanf float parsing

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This commit is contained in:
Andreas Schwab 2013-01-14 17:32:20 +01:00
parent 273cdee86d
commit 6ecec3b616
5 changed files with 61 additions and 12 deletions
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6
ChangeLog
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@ -1,5 +1,11 @@
2013-04-11 Andreas Schwab <schwab@suse.de>
[BZ #13988]
* stdio-common/vfscanf.c (_IO_vfwscanf): When parsing a float
accept exponent character only when digits were seen.
* stdio-common/Makefile (tests): Add bug26.
* stdio-common/bug26.c: New file.
[BZ #14293]
* elf/dl-load.c (_dl_init_paths): Mark decomposed RUNPATH as
non-freeable.

12
NEWS
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@ -9,12 +9,12 @@ Version 2.18
* The following bugs are resolved with this release:
10060, 10062, 10357, 11120, 11561, 12723, 13550, 13889, 13951, 14142,
14176, 14200, 14293, 14317, 14327, 14478, 14496, 14686, 14812, 14920,
14964, 14981, 14982, 14985, 14994, 14996, 15003, 15006, 15020, 15023,
15036, 15054, 15055, 15062, 15078, 15160, 15214, 15232, 15234, 15283,
15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335, 15336,
15337, 15342, 15346.
10060, 10062, 10357, 11120, 11561, 12723, 13550, 13889, 13951, 13988,
14142, 14176, 14200, 14293, 14317, 14327, 14478, 14496, 14686, 14812,
14920, 14964, 14981, 14982, 14985, 14994, 14996, 15003, 15006, 15020,
15023, 15036, 15054, 15055, 15062, 15078, 15160, 15214, 15232, 15234,
15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
15336, 15337, 15342, 15346.
* CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
#15078).

2
stdio-common/Makefile
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@ -57,7 +57,7 @@ tests := tstscanf test_rdwr test-popen tstgetln test-fseek \
bug19 bug19a tst-popen2 scanf13 scanf14 scanf15 bug20 bug21 bug22 \
scanf16 scanf17 tst-setvbuf1 tst-grouping bug23 bug24 \
bug-vfprintf-nargs tst-long-dbl-fphex tst-fphex-wide tst-sprintf3 \
bug25 tst-printf-round
bug25 tst-printf-round bug26
test-srcs = tst-unbputc tst-printf

37
stdio-common/bug26.c Normal file
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@ -0,0 +1,37 @@
/* Copyright (C) 2013 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <string.h>
int
main (void)
{
FILE *f;
int lost = 0;
int c;
double d;
char s[] = "+.e";
f = fmemopen (s, strlen (s), "r");
/* This should fail to parse a float and leave 'e' in the input. */
lost |= (fscanf (f, "%f", &d) != 0);
c = fgetc (f);
lost |= c != 'e';
puts (lost ? "Test FAILED!" : "Test succeeded.");
return lost;
}

16
stdio-common/vfscanf.c
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@ -222,7 +222,7 @@ _IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr,
/* Errno of last failed inchar call. */
int inchar_errno = 0;
/* Status for reading F-P nums. */
char got_dot, got_e, negative;
char got_digit, got_dot, got_e, negative;
/* If a [...] is a [^...]. */
CHAR_T not_in;
#define exp_char not_in
@ -1845,7 +1845,7 @@ _IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr,
if (__builtin_expect (c == EOF, 0))
input_error ();
got_dot = got_e = 0;
got_digit = got_dot = got_e = 0;
/* Check for a sign. */
if (c == L_('-') || c == L_('+'))
@ -1971,13 +1971,19 @@ _IO_vfscanf_internal (_IO_FILE *s, const char *format, _IO_va_list argptr,
while (1)
{
if (ISDIGIT (c))
ADDW (c);
{
ADDW (c);
got_digit = 1;
}
else if (!got_e && (flags & HEXA_FLOAT) && ISXDIGIT (c))
ADDW (c);
{
ADDW (c);
got_digit = 1;
}
else if (got_e && wp[wpsize - 1] == exp_char
&& (c == L_('-') || c == L_('+')))
ADDW (c);
else if (wpsize > 0 && !got_e
else if (got_digit && !got_e
&& (CHAR_T) TOLOWER (c) == exp_char)
{
ADDW (exp_char);