Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
// 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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#ifdef CONFIG_SYSCTL
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#include <linux/sysctl.h>
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static const struct ctl_table vdso_table[] = {
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{
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#ifdef CONFIG_X86_64
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.procname = "vsyscall32",
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#else
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.procname = "vdso_enabled",
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#endif
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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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static __init int ia32_binfmt_init(void)
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{
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#ifdef CONFIG_X86_64
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/* Register vsyscall32 into the ABI table */
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register_sysctl("abi", vdso_table);
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#else
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register_sysctl_init("vm", vdso_table);
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#endif
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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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