diff options
| author | Ram Pai <linuxram@us.ibm.com> | 2018-01-19 04:50:38 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-20 14:59:04 +0300 |
| commit | bca7aacfe8be121ecefb3be609420220b0820c2c (patch) | |
| tree | 8e49c046113a0e78973ccadb354507715d2a790c /arch/powerpc/include/asm/book3s | |
| parent | f2407ef3ba225665ee24965f69bc84435fb590cf (diff) | |
| download | linux-bca7aacfe8be121ecefb3be609420220b0820c2c.tar.xz | |
powerpc: check key protection for user page access
Make sure that the kernel does not access user pages without
checking their key-protection.
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
[mpe: Integrate with upstream version of pte_access_permitted()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/book3s')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/pgtable.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 449b797f8b7b..1c495068bcfa 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -571,7 +571,14 @@ static inline int pte_present(pte_t pte) return !!(pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT)); } +#ifdef CONFIG_PPC_MEM_KEYS extern bool arch_pte_access_permitted(u64 pte, bool write, bool execute); +#else +static inline bool arch_pte_access_permitted(u64 pte, bool write, bool execute) +{ + return true; +} +#endif /* CONFIG_PPC_MEM_KEYS */ #define pte_access_permitted pte_access_permitted static inline bool pte_access_permitted(pte_t pte, bool write) @@ -593,7 +600,8 @@ static inline bool pte_access_permitted(pte_t pte, bool write) if ((pteval & clear_pte_bits) == clear_pte_bits) return false; - return true; + + return arch_pte_access_permitted(pte_val(pte), write, 0); } /* |