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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/pread_chk.c
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 'debug/pread_chk.c')
-rw-r--r--debug/pread_chk.c9
1 files changed, 3 insertions, 6 deletions
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));
 }