diff options
| -rw-r--r-- | arch/powerpc/kernel/syscalls.c | 3 | ||||
| -rw-r--r-- | include/asm-powerpc/mman.h | 30 |
2 files changed, 33 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c index 4fe69ca2448..c04832c4a02 100644 --- a/arch/powerpc/kernel/syscalls.c +++ b/arch/powerpc/kernel/syscalls.c @@ -143,6 +143,9 @@ static inline unsigned long do_mmap2(unsigned long addr, size_t len, struct file * file = NULL; unsigned long ret = -EINVAL; + if (!arch_validate_prot(prot)) + goto out; + if (shift) { if (off & ((1 << shift) - 1)) goto out; diff --git a/include/asm-powerpc/mman.h b/include/asm-powerpc/mman.h index 0c46bf2c7d5..f8a32e20ba0 100644 --- a/include/asm-powerpc/mman.h +++ b/include/asm-powerpc/mman.h @@ -1,7 +1,9 @@ #ifndef _ASM_POWERPC_MMAN_H #define _ASM_POWERPC_MMAN_H +#include <asm/cputable.h> #include <asm-generic/mman.h> +#include <linux/mm.h> /* * This program is free software; you can redistribute it and/or @@ -26,4 +28,32 @@ #define MAP_POPULATE 0x8000 /* populate (prefault) pagetables */ #define MAP_NONBLOCK 0x10000 /* do not block on IO */ +#ifdef CONFIG_PPC64 +/* + * This file is included by linux/mman.h, so we can't use cacl_vm_prot_bits() + * here. How important is the optimization? + */ +static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot) +{ + return (prot & PROT_SAO) ? VM_SAO : 0; +} +#define arch_calc_vm_prot_bits(prot) arch_calc_vm_prot_bits(prot) + +static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) +{ + return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : 0; +} +#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) + +static inline int arch_validate_prot(unsigned long prot) +{ + if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO)) + return 0; + if ((prot & PROT_SAO) && !cpu_has_feature(CPU_FTR_SAO)) + return 0; + return 1; +} +#define arch_validate_prot(prot) arch_validate_prot(prot) + +#endif /* CONFIG_PPC64 */ #endif /* _ASM_POWERPC_MMAN_H */ |