GNU C Library master sources branch master updated. glibc-2.24-378-gafcf3cd

[azanella at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=afcf3cd8ebff8fed79238a2d1b95338c4606b1ee

commit afcf3cd8ebff8fed79238a2d1b95338c4606b1ee
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Nov 10 09:28:00 2016 -0200

    New internal function __access_noerrno
    
    Implement an internal version of __access called __access_noerrno that
    avoids setting errno.  This is useful to check accessibility of files
    very early on in process startup i.e. before TLS setup.  This allows
    tunables to replace MALLOC_CHECK_ safely (i.e. check existence of
    /etc/suid-debug to enable/disable MALLOC_CHECK) and at the same time
    initialize very early so that it can override IFUNCs.
    
    Checked on x86_64.
    
    	* hurd/hurd.h (__hurd_fail_noerrno): New function.
    	* include/unistd.h [IS_IN (rtld) || !defined SHARED]: Declare
    	__access_noerrno.
    	* io/access.c (__access_noerrno): New function.
    	* sysdeps/mach/hurd/access.c (hurd_fail_seterrno): New function.
    	(hurd_fail_seterrno): Likewise.
    	(access_common): Likewise.
    	(__access_noerrno): Likewise.
    	* sysdeps/nacl/access.c (__access_noerrno): Likewise.
    	* sysdeps/unix/sysv/linux/access.c (__access_noerrno): Likewise.
    	* sysdeps/nacl/nacl-interfaces.h (NACL_CALL_NOERRNO): New
    	macro.

diff --git a/ChangeLog b/ChangeLog
index dfa48e4..b2e5b68 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,18 @@
+2016-11-16  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
+
+	* hurd/hurd.h (__hurd_fail_noerrno): New function.
+	* include/unistd.h [IS_IN (rtld) || !defined SHARED]: Declare
+	__access_noerrno.
+	* io/access.c (__access_noerrno): New function.
+	* sysdeps/mach/hurd/access.c (hurd_fail_seterrno): New function.
+	(hurd_fail_seterrno): Likewise.
+	(access_common): Likewise.
+	(__access_noerrno): Likewise.
+	* sysdeps/nacl/access.c (__access_noerrno): Likewise.
+	* sysdeps/unix/sysv/linux/access.c (__access_noerrno): Likewise.
+	* sysdeps/nacl/nacl-interfaces.h (NACL_CALL_NOERRNO): New
+	macro.
+
 2016-11-16  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/unix/sysv/linux/sh/sh4/register-dump.h (register_dump):
diff --git a/hurd/hurd.h b/hurd/hurd.h
index ec07827..c089d4c 100644
--- a/hurd/hurd.h
+++ b/hurd/hurd.h
@@ -75,6 +75,35 @@ __hurd_fail (error_t err)
   errno = err;
   return -1;
 }
+
+_HURD_H_EXTERN_INLINE int
+__hurd_fail_noerrno (error_t err)
+{
+  switch (err)
+    {
+    case EMACH_SEND_INVALID_DEST:
+    case EMIG_SERVER_DIED:
+      /* The server has disappeared!  */
+      err = EIEIO;
+      break;
+
+    case KERN_NO_SPACE:
+      err = ENOMEM;
+      break;
+
+    case KERN_INVALID_ARGUMENT:
+      err = EINVAL;
+      break;
+
+    case 0:
+      return 0;
+
+    default:
+      break;
+    }
+
+  return -1;
+}
 
 /* Basic ports and info, initialized by startup.  */
 
diff --git a/include/unistd.h b/include/unistd.h
index d2802b2..6144f41 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -181,6 +181,12 @@ extern int __getlogin_r_loginuid (char *name, size_t namesize)
 #   include <dl-unistd.h>
 #  endif
 
+#  if IS_IN (rtld) || !defined SHARED
+/* __access variant that does not set errno.  Used in very early initialization
+   code in libc.a and ld.so.  */
+extern __typeof (__access) __access_noerrno attribute_hidden;
+#  endif
+
 __END_DECLS
 # endif
 
diff --git a/io/access.c b/io/access.c
index 4534704..859cf75 100644
--- a/io/access.c
+++ b/io/access.c
@@ -19,6 +19,13 @@
 #include <stddef.h>
 #include <unistd.h>
 
+/* Test for access to FILE without setting errno.   */
+int
+__access_noerrno (const char *file, int type)
+{
+  return -1;
+}
+
 /* Test for access to FILE.  */
 int
 __access (const char *file, int type)
diff --git a/sysdeps/mach/hurd/access.c b/sysdeps/mach/hurd/access.c
index c308340..93e2166 100644
--- a/sysdeps/mach/hurd/access.c
+++ b/sysdeps/mach/hurd/access.c
@@ -22,9 +22,20 @@
 #include <hurd/lookup.h>
 #include <fcntl.h>
 
-/* Test for access to FILE by our real user and group IDs.  */
-int
-__access (const char *file, int type)
+static int
+hurd_fail_seterrno (error_t err)
+{
+  return __hurd_fail (err);
+}
+
+static int
+hurd_fail_noerrno (error_t err)
+{
+  return __hurd_fail_noerrno (err);
+}
+
+static int
+access_common (const char *file, int type, int (*errfunc) (error_t))
 {
   error_t err;
   file_t rcrdir, rcwdir, io;
@@ -120,13 +131,13 @@ __access (const char *file, int type)
   if (rcwdir != MACH_PORT_NULL)
     __mach_port_deallocate (__mach_task_self (), rcwdir);
   if (err)
-    return __hurd_fail (err);
+    return errfunc (err);
 
   /* Find out what types of access we are allowed to this file.  */
   err = __file_check_access (io, &allowed);
   __mach_port_deallocate (__mach_task_self (), io);
   if (err)
-    return __hurd_fail (err);
+    return errfunc (err);
 
   flags = 0;
   if (type & R_OK)
@@ -138,9 +149,23 @@ __access (const char *file, int type)
 
   if (flags & ~allowed)
     /* We are not allowed all the requested types of access.  */
-    return __hurd_fail (EACCES);
+    return errfunc (EACESS);
 
   return 0;
 }
 
+/* Test for access to FILE by our real user and group IDs without setting
+   errno.  */
+int
+__access_noerrno (const char *file, int type)
+{
+  return access_common (file, type, hurd_fail_noerrno);
+}
+
+/* Test for access to FILE by our real user and group IDs.  */
+int
+__access (const char *file, int type)
+{
+  return access_common (file, type, hurd_fail_seterrno);
+}
 weak_alias (__access, access)
diff --git a/sysdeps/nacl/access.c b/sysdeps/nacl/access.c
index 95a0fb7..e07d558 100644
--- a/sysdeps/nacl/access.c
+++ b/sysdeps/nacl/access.c
@@ -19,6 +19,13 @@
 #include <unistd.h>
 #include <nacl-interfaces.h>
 
+/* Test for access to FILE without setting errno.  */
+int
+__access_noerrno (const char *file, int type)
+{
+  return NACL_CALL_NOERRNO (__nacl_irt_dev_filename.access (file, type), 0);
+}
+
 /* Test for access to FILE.  */
 int
 __access (const char *file, int type)
diff --git a/sysdeps/nacl/nacl-interfaces.h b/sysdeps/nacl/nacl-interfaces.h
index b7b45bb..edd3217 100644
--- a/sysdeps/nacl/nacl-interfaces.h
+++ b/sysdeps/nacl/nacl-interfaces.h
@@ -113,4 +113,8 @@ __nacl_fail (int err)
 #define NACL_CALL(err, val) \
   ({ int _err = (err); _err ? __nacl_fail (_err) : (val); })
 
+/* Same as NACL_CALL but without setting errno.  */
+#define NACL_CALL_NOERRNO(err, val) \
+  ({ int _err = (err); _err ? _err : (val); })
+
 #endif  /* nacl-interfaces.h */
diff --git a/sysdeps/unix/sysv/linux/access.c b/sysdeps/unix/sysv/linux/access.c
index 8f003df..adefbca 100644
--- a/sysdeps/unix/sysv/linux/access.c
+++ b/sysdeps/unix/sysv/linux/access.c
@@ -21,6 +21,21 @@
 #include <sysdep-cancel.h>
 
 int
+__access_noerrno (const char *file, int type)
+{
+  int res;
+  INTERNAL_SYSCALL_DECL (err);
+#ifdef __NR_access
+  res = INTERNAL_SYSCALL_CALL (access, err, file, type);
+#else
+  res = INTERNAL_SYSCALL_CALL (faccessat, err, AT_FDCWD, file, type);
+#endif
+  if (INTERNAL_SYSCALL_ERROR_P (res, err))
+    return INTERNAL_SYSCALL_ERRNO (res, err);
+  return 0;
+}
+
+int
 __access (const char *file, int type)
 {
 #ifdef __NR_access

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                        |   15 +++++++++++++++
 hurd/hurd.h                      |   29 +++++++++++++++++++++++++++++
 include/unistd.h                 |    6 ++++++
 io/access.c                      |    7 +++++++
 sysdeps/mach/hurd/access.c       |   37 +++++++++++++++++++++++++++++++------
 sysdeps/nacl/access.c            |    7 +++++++
 sysdeps/nacl/nacl-interfaces.h   |    4 ++++
 sysdeps/unix/sysv/linux/access.c |   15 +++++++++++++++
 8 files changed, 114 insertions(+), 6 deletions(-)


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