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99 lines
2.0 KiB
99 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* (C) Copyright 2002 Linus Torvalds |
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* Portions based on the vdso-randomization code from exec-shield: |
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* Copyright(C) 2005-2006, Red Hat, Inc., Ingo Molnar |
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* |
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* This file contains the needed initializations to support sysenter. |
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*/ |
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#include <linux/init.h> |
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#include <linux/smp.h> |
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#include <linux/kernel.h> |
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#include <linux/mm_types.h> |
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#include <linux/elf.h> |
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#include <asm/processor.h> |
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#include <asm/vdso.h> |
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#ifdef CONFIG_COMPAT_VDSO |
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#define VDSO_DEFAULT 0 |
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#else |
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#define VDSO_DEFAULT 1 |
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#endif |
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/* |
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* Should the kernel map a VDSO page into processes and pass its |
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* address down to glibc upon exec()? |
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*/ |
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unsigned int __read_mostly vdso32_enabled = VDSO_DEFAULT; |
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static int __init vdso32_setup(char *s) |
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{ |
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vdso32_enabled = simple_strtoul(s, NULL, 0); |
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if (vdso32_enabled > 1) { |
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pr_warn("vdso32 values other than 0 and 1 are no longer allowed; vdso disabled\n"); |
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vdso32_enabled = 0; |
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} |
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return 1; |
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} |
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/* |
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* For consistency, the argument vdso32=[012] affects the 32-bit vDSO |
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* behavior on both 64-bit and 32-bit kernels. |
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* On 32-bit kernels, vdso=[012] means the same thing. |
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*/ |
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__setup("vdso32=", vdso32_setup); |
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#ifdef CONFIG_X86_32 |
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__setup_param("vdso=", vdso_setup, vdso32_setup, 0); |
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#endif |
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int __init sysenter_setup(void) |
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{ |
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init_vdso_image(&vdso_image_32); |
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return 0; |
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} |
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#ifdef CONFIG_X86_64 |
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subsys_initcall(sysenter_setup); |
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#ifdef CONFIG_SYSCTL |
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/* Register vsyscall32 into the ABI table */ |
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#include <linux/sysctl.h> |
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static struct ctl_table abi_table2[] = { |
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{ |
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.procname = "vsyscall32", |
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.data = &vdso32_enabled, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec_minmax, |
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.extra1 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_ONE, |
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}, |
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{} |
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}; |
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static struct ctl_table abi_root_table2[] = { |
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{ |
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.procname = "abi", |
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.mode = 0555, |
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.child = abi_table2 |
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}, |
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{} |
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}; |
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static __init int ia32_binfmt_init(void) |
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{ |
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register_sysctl_table(abi_root_table2); |
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return 0; |
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} |
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__initcall(ia32_binfmt_init); |
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#endif /* CONFIG_SYSCTL */ |
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#endif /* CONFIG_X86_64 */
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