arm64/vdso: Restrict splitting VVAR VMA

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Forbid splitting VVAR VMA resulting in a stricter ABI and reducing the
amount of corner-cases to consider while working further on VDSO time
namespace support.

As the offset from timens to VVAR page is computed compile-time, the pages
in VVAR should stay together and not being partically mremap()'ed.

Signed-off-by: Andrei Vagin <avagin@gmail.com>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Dmitry Safonov <dima@arista.com>
Link: https://lore.kernel.org/r/20200624083321.144975-6-avagin@gmail.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Andrei Vagin 2020-06-24 01:33:20 -07:00 • committed by Catalin Marinas

parent ee3cda8e46

commit bcf9964342

1 changed files with 13 additions and 0 deletions

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arch/arm64/kernel/vdso.c

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