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83d3f0e90c
Some processes (CRIU) are moving the vDSO area using the mremap system call. As a consequence the kernel reference to the vDSO base address is no more valid and the signal return frame built once the vDSO has been moved is not pointing to the new sigreturn address. This patch handles vDSO remapping and unmapping. Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com> Reviewed-by: Ingo Molnar <mingo@kernel.org> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
28 lines
839 B
C
28 lines
839 B
C
/*
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* Architecture specific mm hooks
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*
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* Copyright (C) 2015, IBM Corporation
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* Author: Laurent Dufour <ldufour@linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_POWERPC_MM_ARCH_HOOKS_H
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#define _ASM_POWERPC_MM_ARCH_HOOKS_H
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static inline void arch_remap(struct mm_struct *mm,
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unsigned long old_start, unsigned long old_end,
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unsigned long new_start, unsigned long new_end)
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{
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/*
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* mremap() doesn't allow moving multiple vmas so we can limit the
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* check to old_start == vdso_base.
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*/
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if (old_start == mm->context.vdso_base)
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mm->context.vdso_base = new_start;
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}
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#define arch_remap arch_remap
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#endif /* _ASM_POWERPC_MM_ARCH_HOOKS_H */
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