arm64/vdso: Zap vvar pages when switching to a time namespace

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The order of vvar pages depends on whether a task belongs to the root
time namespace or not. In the root time namespace, a task doesn't have a
per-namespace page. In a non-root namespace, the VVAR page which contains
the system-wide VDSO data is replaced with a namespace specific page
that contains clock offsets.

Whenever a task changes its namespace, the VVAR page tables are cleared
and then they will be re-faulted with a corresponding layout.

A task can switch its time namespace only if its ->mm isn't shared with
another task.

Signed-off-by: Andrei Vagin <avagin@gmail.com>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Dmitry Safonov <dima@arista.com>
Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20200624083321.144975-3-avagin@gmail.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Andrei Vagin 2020-06-24 01:33:17 -07:00 • committed by Catalin Marinas

parent d53b5c013e

commit 1b6867d291

1 changed files with 31 additions and 0 deletions

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arch/arm64/kernel/vdso.c

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