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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2020-01-24 14:54:45 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-28 15:14:44 +0300 |
| commit | 3d7dfd632f9b60cfce069b4da517e6b1a1c3f613 (patch) | |
| tree | 02ec1e93d286d7c49dce90a4294f8ddc1edb3af4 /Documentation/arm/setup.rst | |
| parent | 5cd623333e7cf4e3a334c70529268b65f2a6c2c7 (diff) | |
| download | linux-3d7dfd632f9b60cfce069b4da517e6b1a1c3f613.tar.xz | |
powerpc: Implement user_access_save() and user_access_restore()
Implement user_access_save() and user_access_restore()
On 8xx and radix:
- On save, get the value of the associated special register then
prevent user access.
- On restore, set back the saved value to the associated special
register.
On book3s/32:
- On save, get the value stored in current->thread.kuap and prevent
user access.
- On restore, regenerate address range from the stored value and
reopen read/write access for that range.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/54f2f74938006b33c55a416674807b42ef222068.1579866752.git.christophe.leroy@c-s.fr
Diffstat (limited to 'Documentation/arm/setup.rst')
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