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authorUlrich Drepper <drepper@redhat.com>2005-03-01 00:35:23 +0000
committerUlrich Drepper <drepper@redhat.com>2005-03-01 00:35:23 +0000
commit61062f56304750c367c5c1533351621353c112a7 (patch)
tree30cff0c1f42e6eb794c5b7e41145e6cc93802d91 /debug
parentcffa6970f9785ffcb2a60249b1aca6a2cfde4af3 (diff)
downloadglibc-61062f56304750c367c5c1533351621353c112a7.tar.gz
* 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.
Diffstat (limited to 'debug')
-rw-r--r--debug/Makefile6
-rw-r--r--debug/Versions1
-rw-r--r--debug/pread_chk.c9
-rw-r--r--debug/read_chk.c13
-rw-r--r--debug/warning-nop.c38
5 files changed, 50 insertions, 17 deletions
diff --git a/debug/Makefile b/debug/Makefile
index a3f20fd9a7..c904913c35 100644
--- a/debug/Makefile
+++ b/debug/Makefile
@@ -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
diff --git a/debug/Versions b/debug/Versions
index a4229d7852..fd97834171 100644
--- a/debug/Versions
+++ b/debug/Versions
@@ -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;
}
}
diff --git a/debug/pread_chk.c b/debug/pread_chk.c
index 6dfa2ab499..483b5d03ca 100644
--- a/debug/pread_chk.c
+++ b/debug/pread_chk.c
@@ -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));
}
diff --git a/debug/read_chk.c b/debug/read_chk.c
index 88404ed205..f738c48d6b 100644
--- a/debug/read_chk.c
+++ b/debug/read_chk.c
@@ -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. */
+ if (nbytes > buflen)
+ __chk_fail ();
+
#ifdef HAVE_INLINED_SYSCALLS
- ssize_t n = INLINE_SYSCALL (read, 3, fd, buf, MIN (nbytes, buflen + 1));
+ return = INLINE_SYSCALL (read, 3, fd, buf, nbytes);
#else
- ssize_t n = __read (fd, buf, MIN (nbytes, buflen + 1));
+ return = __read (fd, buf, nbytes);
#endif
- if (n > 0 && (size_t) n > buflen)
- __chk_fail ();
- return n;
}
diff --git a/debug/warning-nop.c b/debug/warning-nop.c
new file mode 100644
index 0000000000..84de3a9f17
--- /dev/null
+++ b/debug/warning-nop.c
@@ -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>