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a62c34bd2a
Using arch_vma_name to give special mappings a name is awkward. x86 currently implements it by comparing the start address of the vma to the expected address of the vdso. This requires tracking the start address of special mappings and is probably buggy if a special vma is split or moved. Improve _install_special_mapping to just name the vma directly. Use it to give the x86 vvar area a name, which should make CRIU's life easier. As a side effect, the vvar area will show up in core dumps. This could be considered weird and is fixable. [hpa: I say we accept this as-is but be prepared to deal with knocking out the vvars from core dumps if this becomes a problem.] Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/r/276b39b6b645fb11e345457b503f17b83c2c6fd0.1400538962.git.luto@amacapital.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
#ifndef _ASM_X86_VDSO_H
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#define _ASM_X86_VDSO_H
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#include <asm/page_types.h>
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#include <linux/linkage.h>
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#include <linux/init.h>
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#ifndef __ASSEMBLER__
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#include <linux/mm_types.h>
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struct vdso_image {
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void *data;
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unsigned long size; /* Always a multiple of PAGE_SIZE */
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/* text_mapping.pages is big enough for data/size page pointers */
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struct vm_special_mapping text_mapping;
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unsigned long alt, alt_len;
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unsigned long sym_end_mapping; /* Total size of the mapping */
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unsigned long sym_vvar_page;
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unsigned long sym_hpet_page;
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unsigned long sym_VDSO32_NOTE_MASK;
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unsigned long sym___kernel_sigreturn;
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unsigned long sym___kernel_rt_sigreturn;
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unsigned long sym___kernel_vsyscall;
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unsigned long sym_VDSO32_SYSENTER_RETURN;
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};
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#ifdef CONFIG_X86_64
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extern const struct vdso_image vdso_image_64;
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#endif
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#ifdef CONFIG_X86_X32
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extern const struct vdso_image vdso_image_x32;
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#endif
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#if defined CONFIG_X86_32 || defined CONFIG_COMPAT
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extern const struct vdso_image vdso_image_32_int80;
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#ifdef CONFIG_COMPAT
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extern const struct vdso_image vdso_image_32_syscall;
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#endif
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extern const struct vdso_image vdso_image_32_sysenter;
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extern const struct vdso_image *selected_vdso32;
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#endif
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extern void __init init_vdso_image(const struct vdso_image *image);
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#endif /* __ASSEMBLER__ */
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#endif /* _ASM_X86_VDSO_H */
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