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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 /posix/bits
parentcffa6970f9785ffcb2a60249b1aca6a2cfde4af3 (diff)
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* 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 'posix/bits')
-rw-r--r--posix/bits/unistd.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/posix/bits/unistd.h b/posix/bits/unistd.h
index 3b9c67cb31..0e5417c86c 100644
--- a/posix/bits/unistd.h
+++ b/posix/bits/unistd.h
@@ -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