jdk8-mips64-public/hotspot: src/os/linux/vm/globals

7107135: Stack guard pages are no more protected after loading a shared library with executable stack
Summary: Detect the execstack attribute of the loaded library and attempt to fix the stack guard using Safepoint op.
Reviewed-by: dholmes, zgu
Contributed-by: ioi.lam@oracle.com

     1 /*

     2  * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef OS_LINUX_VM_GLOBALS_LINUX_HPP

    26 #define OS_LINUX_VM_GLOBALS_LINUX_HPP

    28 //

    29 // Defines Linux specific flags. They are not available on other platforms.

    30 //

    31 #define RUNTIME_OS_FLAGS(develop, develop_pd, product, product_pd, diagnostic, notproduct) \

    32   product(bool, UseOprofile, false,                                     \

    33         "enable support for Oprofile profiler")                         \

    34                                                                         \

    35   product(bool, UseLinuxPosixThreadCPUClocks, true,                     \

    36           "enable fast Linux Posix clocks where available")             \

    37 /*  NB: The default value of UseLinuxPosixThreadCPUClocks may be        \

    38     overridden in Arguments::parse_each_vm_init_arg.  */                \

    39                                                                         \

    40   product(bool, UseHugeTLBFS, false,                                    \

    41           "Use MAP_HUGETLB for large pages")                            \

    42                                                                         \

    43   product(bool, LoadExecStackDllInVMThread, true,                       \

    44           "Load DLLs with executable-stack attribute in the VM Thread") \

    45                                                                         \

    46   product(bool, UseSHM, false,                                          \

    47           "Use SYSV shared memory for large pages")

    49 //

    50 // Defines Linux-specific default values. The flags are available on all

    51 // platforms, but they may have different default values on other platforms.

    52 //

    53 define_pd_global(bool, UseLargePages, true);

    54 define_pd_global(bool, UseLargePagesIndividualAllocation, false);

    55 define_pd_global(bool, UseOSErrorReporting, false);

    56 define_pd_global(bool, UseThreadPriorities, true) ;

    58 #endif // OS_LINUX_VM_GLOBALS_LINUX_HPP

src/os/linux/vm/globals_linux.hpp@9058789475af

src/os/linux/vm/globals_linux.hpp

Mercurial > jdk8-mips64-public > hotspot / file revision

src/os/linux/vm/globals_linux.hpp@9058789475af

src/os/linux/vm/globals_linux.hpp