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| author |  Christophe Leroy <christophe.leroy@c-s.fr>
| 2020-01-24 11:54:45 +0000 |
|---|---|---|
| committer |  Michael Ellerman <mpe@ellerman.id.au>
| 2020-01-28 23:14:44 +1100 |
| commit | 3d7dfd632f9b60cfce069b4da517e6b1a1c3f613 (patch) | |
| tree | 02ec1e93d286d7c49dce90a4294f8ddc1edb3af4 /arch/powerpc/include/asm/kup.h | |
| parent | powerpc: Implement user_access_begin and friends (diff) | |
| download | linux-3d7dfd632f9b60cfce069b4da517e6b1a1c3f613.tar.gz linux-3d7dfd632f9b60cfce069b4da517e6b1a1c3f613.tar.bz2 linux-3d7dfd632f9b60cfce069b4da517e6b1a1c3f613.zip | |
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 'arch/powerpc/include/asm/kup.h')
| -rw-r--r-- | arch/powerpc/include/asm/kup.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kup.h b/arch/powerpc/include/asm/kup.h index c3ce7e8ae9ea..92bcd1a26d73 100644 --- a/arch/powerpc/include/asm/kup.h +++ b/arch/powerpc/include/asm/kup.h @@ -55,6 +55,8 @@ static inline void allow_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) { } static inline void prevent_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) { } +static inline unsigned long prevent_user_access_return(void) { return 0UL; } +static inline void restore_user_access(unsigned long flags) { } static inline bool bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write) { |