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GNU C Library master sources branch master updated. glibc-2.22-527-gc0d6f2a
- From: roland at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 11 Nov 2015 04:13:36 -0000
- Subject: GNU C Library master sources branch master updated. glibc-2.22-527-gc0d6f2a
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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=c0d6f2a33e1229a96d5d5064b9b04d7d3cd41d9d
commit c0d6f2a33e1229a96d5d5064b9b04d7d3cd41d9d
Author: Roland McGrath <roland@hack.frob.com>
Date: Tue Nov 10 19:44:48 2015 -0800
NaCl: Use open_resource API for shared objects
diff --git a/ChangeLog b/ChangeLog
index b23297b..39cc8db 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2015-11-10 Roland McGrath <roland@hack.frob.com>
+
+ * elf/dl-load.c (open_verify): Take new argument FD.
+ Skip __open call if passed FD is not -1.
+ (_dl_map_object, open_path): Update callers.
+ * elf/dl-sysdep-open.h: New file.
+ * elf/dl-load.c: Include it.
+ (_dl_map_object): Try _dl_sysdep_open_object before ldconfig cache.
+ * sysdeps/nacl/dl-sysdep.c (_dl_sysdep_open_object): New function.
+ * sysdeps/nacl/dl-sysdep-open.h: New file.
+ * sysdeps/nacl/nacl-interface-list.h: Move nacl_irt_resource_open
+ from libc to rtld.
+
2015-11-10 Joseph Myers <joseph@codesourcery.com>
[BZ #19228]
diff --git a/elf/dl-load.c b/elf/dl-load.c
index c5e948e..6fb615e 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -43,6 +43,7 @@
#include <dl-map-segments.h>
#include <dl-unmap-segments.h>
#include <dl-machine-reject-phdr.h>
+#include <dl-sysdep-open.h>
#include <endian.h>
@@ -1483,9 +1484,13 @@ print_search_path (struct r_search_path_elem **list,
ignore only ELF files for other architectures. Non-ELF files and
ELF files with different header information cause fatal errors since
this could mean there is something wrong in the installation and the
- user might want to know about this. */
+ user might want to know about this.
+
+ If FD is not -1, then the file is already open and FD refers to it.
+ In that case, FD is consumed for both successful and error returns. */
static int
-open_verify (const char *name, struct filebuf *fbp, struct link_map *loader,
+open_verify (const char *name, int fd,
+ struct filebuf *fbp, struct link_map *loader,
int whatcode, int mode, bool *found_other_class, bool free_name)
{
/* This is the expected ELF header. */
@@ -1526,6 +1531,7 @@ open_verify (const char *name, struct filebuf *fbp, struct link_map *loader,
if (__glibc_unlikely (GLRO(dl_naudit) > 0) && whatcode != 0
&& loader->l_auditing == 0)
{
+ const char *original_name = name;
struct audit_ifaces *afct = GLRO(dl_audit);
for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
{
@@ -1540,11 +1546,21 @@ open_verify (const char *name, struct filebuf *fbp, struct link_map *loader,
afct = afct->next;
}
+
+ if (fd != -1 && name != original_name && strcmp (name, original_name))
+ {
+ /* An audit library changed what we're supposed to open,
+ so FD no longer matches it. */
+ __close (fd);
+ fd = -1;
+ }
}
#endif
- /* Open the file. We always open files read-only. */
- int fd = __open (name, O_RDONLY | O_CLOEXEC);
+ if (fd == -1)
+ /* Open the file. We always open files read-only. */
+ fd = __open (name, O_RDONLY | O_CLOEXEC);
+
if (fd != -1)
{
ElfW(Ehdr) *ehdr;
@@ -1813,7 +1829,7 @@ open_path (const char *name, size_t namelen, int mode,
if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_LIBS))
_dl_debug_printf (" trying file=%s\n", buf);
- fd = open_verify (buf, fbp, loader, whatcode, mode,
+ fd = open_verify (buf, -1, fbp, loader, whatcode, mode,
found_other_class, false);
if (this_dir->status[cnt] == unknown)
{
@@ -2064,6 +2080,20 @@ _dl_map_object (struct link_map *loader, const char *name,
&loader->l_runpath_dirs, &realname, &fb, loader,
LA_SER_RUNPATH, &found_other_class);
+ if (fd == -1)
+ {
+ realname = _dl_sysdep_open_object (name, namelen, &fd);
+ if (realname != NULL)
+ {
+ fd = open_verify (realname, fd,
+ &fb, loader ?: GL(dl_ns)[nsid]._ns_loaded,
+ LA_SER_CONFIG, mode, &found_other_class,
+ false);
+ if (fd == -1)
+ free (realname);
+ }
+ }
+
#ifdef USE_LDCONFIG
if (fd == -1
&& (__glibc_likely ((mode & __RTLD_SECURE) == 0)
@@ -2109,7 +2139,7 @@ _dl_map_object (struct link_map *loader, const char *name,
if (cached != NULL)
{
- fd = open_verify (cached,
+ fd = open_verify (cached, -1,
&fb, loader ?: GL(dl_ns)[nsid]._ns_loaded,
LA_SER_CONFIG, mode, &found_other_class,
false);
@@ -2144,7 +2174,7 @@ _dl_map_object (struct link_map *loader, const char *name,
fd = -1;
else
{
- fd = open_verify (realname, &fb,
+ fd = open_verify (realname, -1, &fb,
loader ?: GL(dl_ns)[nsid]._ns_loaded, 0, mode,
&found_other_class, true);
if (__glibc_unlikely (fd == -1))
diff --git a/elf/dl-sysdep-open.h b/elf/dl-sysdep-open.h
new file mode 100644
index 0000000..a63d9f5
--- /dev/null
+++ b/elf/dl-sysdep-open.h
@@ -0,0 +1,45 @@
+/* System-specific call to open a shared object by name. Stub version.
+ Copyright (C) 2015 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _DL_SYSDEP_OPEN_H
+#define _DL_SYSDEP_OPEN_H 1
+
+#include <assert.h>
+#include <stddef.h>
+
+/* NAME is a name without slashes, as it appears in a DT_NEEDED entry
+ or a dlopen call's argument or suchlike. NAMELEN is (strlen (NAME) + 1).
+
+ Find NAME in an OS-dependent fashion, and return its "real" name.
+ Optionally fill in *FD with a file descriptor open on that file (or
+ else leave its initial value of -1). The return value is a new
+ malloc'd string, which will be free'd by the caller. If NAME is
+ resolved to an actual file that can be opened, then the return
+ value should name that file (and if *FD was not set, then a normal
+ __open call on that string will be made). If *FD was set by some
+ other means than a normal open and there is no "real" name to use,
+ then __strdup (NAME) is fine (modulo error checking). */
+
+static inline char *
+_dl_sysdep_open_object (const char *name, size_t namelen, int *fd)
+{
+ assert (*fd == -1);
+ return NULL;
+}
+
+#endif /* dl-sysdep-open.h */
diff --git a/sysdeps/nacl/dl-sysdep-open.h b/sysdeps/nacl/dl-sysdep-open.h
new file mode 100644
index 0000000..38b0f9e
--- /dev/null
+++ b/sysdeps/nacl/dl-sysdep-open.h
@@ -0,0 +1,40 @@
+/* System-specific call to open a shared object by name. NaCl version.
+ Copyright (C) 2015 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _DL_SYSDEP_OPEN_H
+#define _DL_SYSDEP_OPEN_H 1
+
+#include <stddef.h>
+
+/* NAME is a name without slashes, as it appears in a DT_NEEDED entry
+ or a dlopen call's argument or suchlike. NAMELEN is (strlen (NAME) + 1).
+
+ Find NAME in an OS-dependent fashion, and return its "real" name.
+ Optionally fill in *FD with a file descriptor open on that file (or
+ else leave its initial value of -1). The return value is a new
+ malloc'd string, which will be free'd by the caller. If NAME is
+ resolved to an actual file that can be opened, then the return
+ value should name that file (and if *FD was not set, then a normal
+ __open call on that string will be made). If *FD was set by some
+ other means than a normal open and there is no "real" name to use,
+ then __strdup (NAME) is fine (modulo error checking). */
+
+extern char *_dl_sysdep_open_object (const char *name, size_t namelen, int *fd)
+ internal_function attribute_hidden;
+
+#endif /* dl-sysdep-open.h */
diff --git a/sysdeps/nacl/dl-sysdep.c b/sysdeps/nacl/dl-sysdep.c
index 3e902c2..3a04aa1 100644
--- a/sysdeps/nacl/dl-sysdep.c
+++ b/sysdeps/nacl/dl-sysdep.c
@@ -87,3 +87,26 @@ _dl_start_user (void (*user_entry) (uint32_t info[]), uint32_t info[])
#endif /* SHARED */
#include <elf/dl-sysdep.c>
+
+#include <dl-sysdep-open.h>
+#include <nacl-interfaces.h>
+#include <assert.h>
+#include <string.h>
+#include <unistd.h>
+
+char *
+internal_function
+_dl_sysdep_open_object (const char *name, size_t namelen, int *fd)
+{
+ int error = __nacl_irt_resource_open.open_resource (name, fd);
+ if (error)
+ return NULL;
+ assert (*fd != -1);
+ char *realname = __strdup (name);
+ if (__glibc_unlikely (realname == NULL))
+ {
+ __close (*fd);
+ *fd = -1;
+ }
+ return realname;
+}
diff --git a/sysdeps/nacl/nacl-interface-list.h b/sysdeps/nacl/nacl-interface-list.h
index cb33751..c68faed 100644
--- a/sysdeps/nacl/nacl-interface-list.h
+++ b/sysdeps/nacl/nacl-interface-list.h
@@ -28,7 +28,7 @@ NACL_MANDATORY_INTERFACE (rtld,
NACL_IRT_FUTEX_v0_1, nacl_irt_futex)
NACL_MANDATORY_INTERFACE (rtld,
NACL_IRT_TLS_v0_1, nacl_irt_tls)
-NACL_MANDATORY_INTERFACE (libc,
+NACL_MANDATORY_INTERFACE (rtld,
NACL_IRT_RESOURCE_OPEN_v0_1, nacl_irt_resource_open)
NACL_MANDATORY_INTERFACE (rtld,
NACL_IRT_CODE_DATA_ALLOC_v0_1,
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 13 ++++++++++
elf/dl-load.c | 44 +++++++++++++++++++++++++++++-----
elf/dl-sysdep-open.h | 45 ++++++++++++++++++++++++++++++++++++
sysdeps/nacl/dl-sysdep-open.h | 40 ++++++++++++++++++++++++++++++++
sysdeps/nacl/dl-sysdep.c | 23 ++++++++++++++++++
sysdeps/nacl/nacl-interface-list.h | 2 +-
6 files changed, 159 insertions(+), 8 deletions(-)
create mode 100644 elf/dl-sysdep-open.h
create mode 100644 sysdeps/nacl/dl-sysdep-open.h
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