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2004-11-18  Ulrich Drepper  <drepper@redhat.com>
	* libio/libio.h (_IO_FLAGS2_FORTIFY): Renamed from
	_IO_FLAGS2_CHECK_PERCENT_N.
	* debug/fprintff_chk.c: Adjust all users.
	* debug/printf_chk.c: Likewise.
	* debug/vfprintf_chk.c: Likewise.
	* debug/vprintf_chk.c: Likewise.
	* debug/vsnprintf_chk.c: Likewise.
	* debug/vsprintf_chk.c: Likewise.
	* stdio-common/vfprintf.c: Likewise.  Detect missing %N$ formats.
	* debug/tst-chk1.c: Test detection of missing %N$ formats.
This commit is contained in:
Ulrich Drepper 2004-11-18 23:25:46 +00:00
parent fb67e07dfb
commit 1b1d36792e
9 changed files with 49 additions and 17 deletions
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13
ChangeLog
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@ -1,6 +1,15 @@
2004-11-17 Alfred M. Szmidt <ams@gnu.org>
2004-11-18 Ulrich Drepper <drepper@redhat.com>
* sysdeps/posix/libc_fatal.c: Include <sys/uio.h>.
* libio/libio.h (_IO_FLAGS2_FORTIFY): Renamed from
_IO_FLAGS2_CHECK_PERCENT_N.
* debug/fprintff_chk.c: Adjust all users.
* debug/printf_chk.c: Likewise.
* debug/vfprintf_chk.c: Likewise.
* debug/vprintf_chk.c: Likewise.
* debug/vsnprintf_chk.c: Likewise.
* debug/vsprintf_chk.c: Likewise.
* stdio-common/vfprintf.c: Likewise. Detect missing %N$ formats.
* debug/tst-chk1.c: Test detection of missing %N$ formats.
2004-11-15 Jakub Jelinek <jakub@redhat.com>

4
debug/fprintf_chk.c
View File

@ -31,14 +31,14 @@ __fprintf_chk (FILE *fp, int flag, const char *format, ...)
_IO_acquire_lock (fp);
if (flag > 0)
fp->_flags2 |= _IO_FLAGS2_CHECK_PERCENT_N;
fp->_flags2 |= _IO_FLAGS2_FORTIFY;
va_start (ap, format);
done = vfprintf (fp, format, ap);
va_end (ap);
if (flag > 0)
fp->_flags2 &= ~_IO_FLAGS2_CHECK_PERCENT_N;
fp->_flags2 &= ~_IO_FLAGS2_FORTIFY;
_IO_release_lock (fp);
return done;

4
debug/printf_chk.c
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@ -31,14 +31,14 @@ __printf_chk (int flag, const char *format, ...)
_IO_acquire_lock (stdout);
if (flag > 0)
stdout->_flags2 |= _IO_FLAGS2_CHECK_PERCENT_N;
stdout->_flags2 |= _IO_FLAGS2_FORTIFY;
va_start (ap, format);
done = vfprintf (stdout, format, ap);
va_end (ap);
if (flag > 0)
stdout->_flags2 &= ~_IO_FLAGS2_CHECK_PERCENT_N;
stdout->_flags2 &= ~_IO_FLAGS2_FORTIFY;
_IO_release_lock (stdout);
return done;

17
debug/tst-chk1.c
View File

@ -474,5 +474,22 @@ do_test (void)
CHK_FAIL_END
#endif
/* Check whether missing N$ formats are detected. */
CHK_FAIL2_START
printf ("%3$d\n", 1, 2, 3, 4);
CHK_FAIL2_END
CHK_FAIL2_START
fprintf (stdout, "%3$d\n", 1, 2, 3, 4);
CHK_FAIL2_END
CHK_FAIL2_START
sprintf (buf, "%3$d\n", 1, 2, 3, 4);
CHK_FAIL2_END
CHK_FAIL2_START
snprintf (buf, sizeof (buf), "%3$d\n", 1, 2, 3, 4);
CHK_FAIL2_END
return ret;
}

4
debug/vfprintf_chk.c
View File

@ -30,12 +30,12 @@ __vfprintf_chk (FILE *fp, int flag, const char *format, va_list ap)
_IO_acquire_lock (fp);
if (flag > 0)
fp->_flags2 |= _IO_FLAGS2_CHECK_PERCENT_N;
fp->_flags2 |= _IO_FLAGS2_FORTIFY;
done = vfprintf (fp, format, ap);
if (flag > 0)
fp->_flags2 &= ~_IO_FLAGS2_CHECK_PERCENT_N;
fp->_flags2 &= ~_IO_FLAGS2_FORTIFY;
_IO_release_lock (fp);
return done;

4
debug/vprintf_chk.c
View File

@ -30,12 +30,12 @@ __vprintf_chk (int flag, const char *format, va_list ap)
_IO_acquire_lock (stdout);
if (flag > 0)
stdout->_flags2 |= _IO_FLAGS2_CHECK_PERCENT_N;
stdout->_flags2 |= _IO_FLAGS2_FORTIFY;
done = vfprintf (stdout, format, ap);
if (flag > 0)
stdout->_flags2 &= ~_IO_FLAGS2_CHECK_PERCENT_N;
stdout->_flags2 &= ~_IO_FLAGS2_FORTIFY;
_IO_release_lock (stdout);
return done;

2
debug/vsnprintf_chk.c
View File

@ -58,7 +58,7 @@ __vsnprintf_chk (char *s, size_t maxlen, int flags, size_t slen,
/* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
can only come from read-only format strings. */
if (flags > 0)
sf.f._sbf._f._flags2 |= _IO_FLAGS2_CHECK_PERCENT_N;
sf.f._sbf._f._flags2 |= _IO_FLAGS2_FORTIFY;
_IO_str_init_static_internal (&sf.f, s, maxlen - 1, s);
ret = INTUSE(_IO_vfprintf) ((_IO_FILE *) &sf.f._sbf, format, args);

2
debug/vsprintf_chk.c
View File

@ -81,7 +81,7 @@ __vsprintf_chk (char *s, int flags, size_t slen, const char *format,
/* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
can only come from read-only format strings. */
if (flags > 0)
f._sbf._f._flags2 |= _IO_FLAGS2_CHECK_PERCENT_N;
f._sbf._f._flags2 |= _IO_FLAGS2_FORTIFY;
ret = INTUSE(_IO_vfprintf) ((_IO_FILE *) &f._sbf, format, args);

16
stdio-common/vfprintf.c
View File

@ -882,18 +882,18 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap)
/* NOTREACHED */ \
\
LABEL (form_number): \
if (s->_flags2 & _IO_FLAGS2_CHECK_PERCENT_N) \
if (s->_flags2 & _IO_FLAGS2_FORTIFY) \
{ \
if (! readonly_format) \
{ \
extern int __readonly_area (const void *, size_t) \
attribute_hidden; \
readonly_format \
= __readonly_area (format, (STR_LEN (format) + 1) \
* sizeof (CHAR_T)); \
= __readonly_area (format, ((STR_LEN (format) + 1) \
* sizeof (CHAR_T))); \
} \
if (readonly_format < 0) \
__chk_fail (); \
__libc_fatal ("*** %n is writable segment detected ***\n"); \
} \
/* Answer the count of characters written. */ \
if (fspec == NULL) \
@ -1649,7 +1649,8 @@ do_positional:
/* Allocate memory for the argument descriptions. */
args_type = alloca (nargs * sizeof (int));
memset (args_type, 0, nargs * sizeof (int));
memset (args_type, s->_flags2 & _IO_FLAGS2_FORTIFY ? '\xff' : '\0',
nargs * sizeof (int));
args_value = alloca (nargs * sizeof (union printf_arg));
/* XXX Could do sanity check here: If any element in ARGS_TYPE is
@ -1714,6 +1715,11 @@ do_positional:
else
args_value[cnt].pa_long_double = 0.0;
break;
case -1:
/* Error case. Not all parameters appear in N$ format
strings. We have no way to determine their type. */
assert (s->_flags2 & _IO_FLAGS2_FORTIFY);
__libc_fatal ("*** invalid %N$ use detected ***\n");
}
/* Now walk through all format specifiers and process them. */