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2001-03-19  Ulrich Drepper  <drepper@redhat.com>

	* elf/dl-dst.h (DL_DST_COUNT): Add __builtin_expect.

	* elf/dl-load.c (_dl_dst_count): Make DST recognition more robust.
	(_dl_dst_substitute): Likewise.
This commit is contained in:
Ulrich Drepper 2001-03-20 06:52:36 +00:00
parent 4a4d50f372
commit 2541eda0d4
3 changed files with 68 additions and 60 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
2001-03-19 Ulrich Drepper <drepper@redhat.com>
* elf/dl-dst.h (DL_DST_COUNT): Add __builtin_expect.
* elf/dl-load.c (_dl_dst_count): Make DST recognition more robust.
(_dl_dst_substitute): Likewise.
2001-03-17 Bruno Haible <haible@clisp.cons.org>
* intl/loadmsgcat.c (_nl_load_domain) [!_LIBC]: Use fstat, not fstat64.

4
elf/dl-dst.h
View File

@ -1,5 +1,5 @@
/* Handling of dynamic sring tokens.
Copyright (C) 1999 Free Software Foundation, Inc.
Copyright (C) 1999, 2001 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
@ -24,7 +24,7 @@
size_t __cnt = 0; \
const char *__sf = strchr (name, '$'); \
\
if (__sf != NULL) \
if (__builtin_expect (__sf != NULL, 0)) \
__cnt = _dl_dst_count (__sf, is_path); \
\
__cnt; })

117
elf/dl-load.c
View File

@ -180,26 +180,28 @@ _dl_dst_count (const char *name, int is_path)
{
size_t len = 1;
/* $ORIGIN is not expanded for SUID/GUID programs.
/* $ORIGIN is not expanded for SUID/GUID programs and it must
always appear first in path.
Note that it is no bug that the strings in the first two `strncmp'
calls are longer than the sequence which is actually tested. */
if ((((strncmp (&name[1], "ORIGIN}", 6) == 0
&& (!__libc_enable_secure
|| ((name[7] == '\0' || (is_path && name[7] == ':'))
&& (name == start || (is_path && name[-1] == ':'))))
&& (len = 7) != 0)
|| (strncmp (&name[1], "PLATFORM}", 8) == 0 && (len = 9) != 0))
&& (name[len] == '\0' || name[len] == '/'
|| (is_path && name[len] == ':')))
|| (name[1] == '{'
&& ((strncmp (&name[2], "ORIGIN}", 7) == 0
&& (!__libc_enable_secure
|| ((name[9] == '\0' || (is_path && name[9] == ':'))
&& (name == start || (is_path && name[-1] == ':'))))
&& (len = 9) != 0)
|| (strncmp (&name[2], "PLATFORM}", 9) == 0
&& (len = 11) != 0))))
Note that it is no bug that the string in the second and
fourth `strncmp' call is longer than the sequence which is
actually tested. */
if (((strncmp (&name[1], "{ORIGIN}", 8) == 0 && (len = 9) != 0)
|| (strncmp (&name[1], "{ORIGIN}" + 1, 6) == 0
&& (name[7] == '\0' || name[7] == '/'
|| (is_path && name[7] == ':'))
&& (len = 7) != 0)))
{
if (__builtin_expect (!__libc_enable_secure, 1)
&& (name == start || (is_path && name[-1] == ':')))
++cnt;
}
else if ((strncmp (&name[1], "{PLATFORM}", 10) == 0
&& (len = 11) != 0)
|| (strncmp (&name[1], "{PLATFORM}" + 1, 8) == 0
&& (name[9] == '\0' || name[9] == '/'
|| (is_path && name[9] == ':'))
&& (len = 9) != 0))
++cnt;
name = strchr (name + len, '$');
@ -225,57 +227,56 @@ _dl_dst_substitute (struct link_map *l, const char *name, char *result,
do
{
if (*name == '$')
if (__builtin_expect (*name, 'a') == '$')
{
const char *repl;
size_t len;
const char *repl = NULL;
size_t len = 1;
/* Note that it is no bug that the strings in the first two `strncmp'
calls are longer than the sequence which is actually tested. */
if ((((strncmp (&name[1], "ORIGIN}", 6) == 0 && (len = 7) != 0)
|| (strncmp (&name[1], "PLATFORM}", 8) == 0 && (len = 9) != 0))
&& (name[len] == '\0' || name[len] == '/'
|| (is_path && name[len] == ':')))
|| (name[1] == '{'
&& ((strncmp (&name[2], "ORIGIN}", 7) == 0 && (len = 9) != 0)
|| (strncmp (&name[2], "PLATFORM}", 9) == 0
&& (len = 11) != 0))))
/* Note that it is no bug that the string in the second and
fourth `strncmp' call is longer than the sequence which
is actually tested. */
if (((strncmp (&name[1], "{ORIGIN}", 8) == 0 && (len = 9) != 0)
|| (strncmp (&name[1], "{ORIGIN}" + 1, 6) == 0
&& (name[7] == '\0' || name[7] == '/'
|| (is_path && name[7] == ':'))
&& (len = 7) != 0)))
{
repl = ((len == 7 || name[2] == 'O')
? (__libc_enable_secure
&& ((name[len] != '\0'
&& (!is_path || name[len] != ':'))
|| (name != start
&& (!is_path || name[-1] != ':')))
? NULL : l->l_origin)
: _dl_platform);
if (__builtin_expect (!__libc_enable_secure, 1)
&& (name == start || (is_path && name[-1] == ':')))
repl = l->l_origin;
}
else if ((strncmp (&name[1], "{PLATFORM}", 10) == 0
&& (len = 11) != 0)
|| (strncmp (&name[1], "{PLATFORM}" + 1, 8) == 0
&& (name[9] == '\0' || name[9] == '/' || name[9] == ':')
&& (len = 9) != 0))
repl = _dl_platform;
if (repl != NULL && repl != (const char *) -1)
{
wp = __stpcpy (wp, repl);
name += len;
}
else
{
/* We cannot use this path element, the value of the
replacement is unknown. */
wp = last_elem;
name += len;
while (*name != '\0' && (!is_path || *name != ':'))
++name;
}
if (repl != NULL && repl != (const char *) -1)
{
wp = __stpcpy (wp, repl);
name += len;
}
else if (len > 1)
{
/* We cannot use this path element, the value of the
replacement is unknown. */
wp = last_elem;
name += len;
while (*name != '\0' && (!is_path || *name != ':'))
++name;
}
else
/* No DST we recognize. */
*wp++ = *name++;
}
else if (is_path && *name == ':')
else
{
*wp++ = *name++;
last_elem = wp;
if (is_path && *name == ':')
last_elem = wp;
}
else
*wp++ = *name++;
}
while (*name != '\0');