AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-09 23:00:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

* posix/bits/unistd.h: Avoid calling __*_chk variants if we can

Browse Source 
determine the call will never trigger a failure.

	* sysdeps/i386/i686/memset_chk.S: Remove alias and warning.
	* sysdeps/x86_64/memset_chk.S: Likewise.

2005-02-24  Roland McGrath  <roland@redhat.com>

	* debug/Versions (libc: GLIBC_2.4): Remove
	__memset_zero_constant_len_parameter.
	* sysdeps/generic/memset_chk.c: Remove alias and warning.
	* misc/sys/cdefs.h (__warndecl): New macro.
	* debug/warning-nop.c: New file.
	* string/bits/string3.h (memset): Call __warn_memset_zero_len with no
	arguments, instead of calling __memset_zero_constant_len_parameter.
	Use __warndecl for __warn_memset_zero_len.
	* debug/Makefile (routines): Add $(static-only-routines).
	(static-only-routines): New variable.
This commit is contained in:
Ulrich Drepper 2005-03-01 00:35:23 +00:00
parent cffa6970f9
commit 61062f5630
12 changed files with 83 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
ChangeLog
View File

@ -1,3 +1,24 @@
2005-02-28 Ulrich Drepper <drepper@redhat.com>
* posix/bits/unistd.h: Avoid calling __*_chk variants if we can
determine the call will never trigger a failure.
* sysdeps/i386/i686/memset_chk.S: Remove alias and warning.
* sysdeps/x86_64/memset_chk.S: Likewise.
2005-02-24 Roland McGrath <roland@redhat.com>
* debug/Versions (libc: GLIBC_2.4): Remove
__memset_zero_constant_len_parameter.
* sysdeps/generic/memset_chk.c: Remove alias and warning.
* misc/sys/cdefs.h (__warndecl): New macro.
* debug/warning-nop.c: New file.
* string/bits/string3.h (memset): Call __warn_memset_zero_len with no
arguments, instead of calling __memset_zero_constant_len_parameter.
Use __warndecl for __warn_memset_zero_len.
* debug/Makefile (routines): Add $(static-only-routines).
(static-only-routines): New variable.
2005-02-27 Ulrich Drepper <drepper@redhat.com>
* po/tr.po: Update from translation team.

6
debug/Makefile
View File

@ -24,14 +24,16 @@ subdir := debug
headers := execinfo.h
distribute = sigcontextinfo.h register-dump.h frame.h
routines := backtrace backtracesyms backtracesymsfd noophooks \
routines = backtrace backtracesyms backtracesymsfd noophooks \
memcpy_chk memmove_chk mempcpy_chk memset_chk stpcpy_chk \
strcat_chk strcpy_chk strncat_chk strncpy_chk \
sprintf_chk vsprintf_chk snprintf_chk vsnprintf_chk \
printf_chk fprintf_chk vprintf_chk vfprintf_chk \
gets_chk chk_fail readonly-area fgets_chk fgets_u_chk \
read_chk pread_chk pread64_chk recv_chk recvfrom_chk \
readlink_chk getwd_chk getcwd_chk
readlink_chk getwd_chk getcwd_chk \
$(static-only-routines)
static-only-routines := warning-nop
CFLAGS-backtrace.c = -fno-omit-frame-pointer
CFLAGS-sprintf_chk.c = -D_IO_MTSAFE_IO

1
debug/Versions
View File

@ -22,7 +22,6 @@ libc {
__fgets_chk; __fgets_unlocked_chk;
__read_chk; __pread_chk; __pread64_chk;
__readlink_chk; __getcwd_chk; __getwd_chk;
__memset_zero_constant_len_parameter;
__recv_chk; __recvfrom_chk;
}
}

9
debug/pread_chk.c
View File

@ -23,11 +23,8 @@
ssize_t
__pread_chk (int fd, void *buf, size_t nbytes, off_t offset, size_t buflen)
{
/* In case NBYTES is greater than BUFLEN, we read BUFLEN+1 bytes.
This might overflow the buffer but the damage is reduced to just
one byte. And the program will terminate right away. */
ssize_t n = __pread (fd, buf, offset, MIN (nbytes, buflen + 1));
if (n > 0 && (size_t) n > buflen)
if (nbytes > buflen)
__chk_fail ();
return n;
return __pread (fd, buf, offset, MIN (nbytes, buflen + 1));
}

17
debug/read_chk.c
View File

@ -27,15 +27,12 @@
ssize_t
__read_chk (int fd, void *buf, size_t nbytes, size_t buflen)
{
/* In case NBYTES is greater than BUFLEN, we read BUFLEN+1 bytes.
This might overflow the buffer but the damage is reduced to just
one byte. And the program will terminate right away. */
#ifdef HAVE_INLINED_SYSCALLS
ssize_t n = INLINE_SYSCALL (read, 3, fd, buf, MIN (nbytes, buflen + 1));
#else
ssize_t n = __read (fd, buf, MIN (nbytes, buflen + 1));
#endif
if (n > 0 && (size_t) n > buflen)
if (nbytes > buflen)
__chk_fail ();
return n;
#ifdef HAVE_INLINED_SYSCALLS
return = INLINE_SYSCALL (read, 3, fd, buf, nbytes);
#else
return = __read (fd, buf, nbytes);
#endif
}

38
debug/warning-nop.c Normal file
View File

@ -0,0 +1,38 @@
/* Dummy nop functions to elicit link-time warnings.
Copyright (C) 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
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sys/cdefs.h>
void __nop (void)
{
}
/* Don't insert any other #include's before this #undef! */
#undef __warndecl
#define __warndecl(name, msg) \
strong_alias (__nop, name) link_warning (name, msg)
#undef __USE_FORTIFY_LEVEL
#define __USE_FORTIFY_LEVEL 99
/* Following here we need an #include for each public header file
that uses __warndecl. */
#include <string.h>

1
misc/sys/cdefs.h
View File

@ -130,6 +130,7 @@
/* Fortify support. */
#define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
#define __bos0(ptr) __builtin_object_size (ptr, 0)
#define __warndecl(name, msg) extern void name (void)
/* Support for flexible arrays. */

6
posix/bits/unistd.h
View File

@ -25,6 +25,7 @@ extern ssize_t __read_chk (int __fd, void *__buf, size_t __nbytes,
size_t __buflen) __wur;
#define read(fd, buf, nbytes) \
(__bos (buf) != (size_t) -1 \
&& (!__builtin_constant_p (nbytes) || (nbytes) > __bos (buf)) \
? __read_chk (fd, buf, nbytes, __bos (buf)) \
: read (fd, buf, nbytes))
@ -36,11 +37,13 @@ extern ssize_t __pread64_chk (int __fd, void *__buf, size_t __nbytes,
# ifndef __USE_FILE_OFFSET64
# define pread(fd, buf, nbytes, offset) \
(__bos (buf) != (size_t) -1 \
&& (!__builtin_constant_p (nbytes) || (nbytes) > __bos (buf)) \
? __pread64_chk (fd, buf, nbytes, offset, __bos (buf)) \
: pread (fd, buf, offset, nbytes))
# else
# define pread(fd, buf, nbytes, offset) \
(__bos (buf) != (size_t) -1 \
&& (!__builtin_constant_p (nbytes) || (nbytes) > __bos (buf)) \
? __pread_chk (fd, buf, nbytes, offset, __bos (buf)) \
: pread (fd, buf, offset, nbytes))
# endif
@ -48,6 +51,7 @@ extern ssize_t __pread64_chk (int __fd, void *__buf, size_t __nbytes,
# ifdef __USE_LARGEFILE64
# define pread64(fd, buf, nbytes, offset) \
(__bos (buf) != (size_t) -1 \
&& (!__builtin_constant_p (nbytes) || (nbytes) > __bos (buf)) \
? __pread64_chk (fd, buf, nbytes, offset, __bos (buf)) \
: pread64 (fd, buf, offset, nbytes))
# endif
@ -60,6 +64,7 @@ extern int __readlink_chk (__const char *__restrict __path,
__THROW __nonnull ((1, 2)) __wur;
# define readlink(path, buf, len) \
(__bos (buf) != (size_t) -1 \
&& (!__builtin_constant_p (len) || (len) > __bos (buf)) \
? __readlink_chk (path, buf, len, __bos (buf)) \
: readlink (path, buf, len))
#endif
@ -68,6 +73,7 @@ extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
__THROW __wur;
#define getcwd(buf, size) \
(__bos (buf) != (size_t) -1 \
&& (!__builtin_constant_p (size) || (size) > __bos (buf)) \
? __getcwd_chk (buf, size, buflen) : getcwd (buf, size))
#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED

6
string/bits/string3.h
View File

@ -85,11 +85,11 @@ __mempcpy_ichk (void *__restrict __dest, const void *__restrict __src,
especially problematic if the intended fill value is zero. In this
case no work is done at all. We detect these problems by referring
non-existing functions. */
extern char *__memset_zero_constant_len_parameter (void *, int, size_t,
size_t);
__warndecl (__warn_memset_zero_len,
"memset used with constant zero length parameter; this could be due to transposed parameters");
#define memset(dest, ch, len) \
(__builtin_constant_p (len) && (len) == 0 \
? __memset_zero_constant_len_parameter (dest, ch, len, 0) \
? (__warn_memset_zero_len (), (void) (ch), (void) (len), (void *) (dest)) \
: ((__bos0 (dest) != (size_t) -1) \
? __builtin___memset_chk (dest, ch, len, __bos0 (dest)) \
: __memset_ichk (dest, ch, len)))

4
sysdeps/generic/memset_chk.c
View File

@ -90,7 +90,3 @@ __memset_chk (dstpp, c, len, dstlen)
return dstpp;
}
strong_alias (__memset_chk, __memset_zero_constant_len_parameter)
link_warning (__memset_zero_constant_len_parameter,
"memset used with constant zero length parameter; this could be due to transposed parameters")

4
sysdeps/i386/i686/memset_chk.S
View File

@ -32,8 +32,4 @@ ENTRY (__memset_chk)
jb __chk_fail
jmp memset
END (__memset_chk)
strong_alias (__memset_chk, __memset_zero_constant_len_parameter)
.section .gnu.warning.__memset_zero_constant_len_parameter
.string "memset used with constant zero length parameter; this could be due to transposed parameters"
#endif

4
sysdeps/x86_64/memset_chk.S
View File

@ -31,8 +31,4 @@ ENTRY (__memset_chk)
jb __chk_fail
jmp memset
END (__memset_chk)
strong_alias (__memset_chk, __memset_zero_constant_len_parameter)
.section .gnu.warning.__memset_zero_constant_len_parameter
.string "memset used with constant zero length parameter; this could be due to transposed parameters"
#endif