diff options
Diffstat (limited to 'arch/parisc/lib/memcpy.c')
| -rw-r--r-- | arch/parisc/lib/memcpy.c | 43 |
1 files changed, 25 insertions, 18 deletions
diff --git a/arch/parisc/lib/memcpy.c b/arch/parisc/lib/memcpy.c index 4b75388190b4..03165c82dfdb 100644 --- a/arch/parisc/lib/memcpy.c +++ b/arch/parisc/lib/memcpy.c @@ -12,9 +12,10 @@ #include <linux/module.h> #include <linux/compiler.h> #include <linux/uaccess.h> +#include <linux/mm.h> -#define get_user_space() (uaccess_kernel() ? 0 : mfsp(3)) -#define get_kernel_space() (0) +#define get_user_space() mfsp(SR_USER) +#define get_kernel_space() SR_KERNEL /* Returns 0 for success, otherwise, returns number of bytes not transferred. */ extern unsigned long pa_memcpy(void *dst, const void *src, @@ -23,8 +24,8 @@ extern unsigned long pa_memcpy(void *dst, const void *src, unsigned long raw_copy_to_user(void __user *dst, const void *src, unsigned long len) { - mtsp(get_kernel_space(), 1); - mtsp(get_user_space(), 2); + mtsp(get_kernel_space(), SR_TEMP1); + mtsp(get_user_space(), SR_TEMP2); return pa_memcpy((void __force *)dst, src, len); } EXPORT_SYMBOL(raw_copy_to_user); @@ -32,29 +33,35 @@ EXPORT_SYMBOL(raw_copy_to_user); unsigned long raw_copy_from_user(void *dst, const void __user *src, unsigned long len) { - mtsp(get_user_space(), 1); - mtsp(get_kernel_space(), 2); - return pa_memcpy(dst, (void __force *)src, len); -} -EXPORT_SYMBOL(raw_copy_from_user); + unsigned long start = (unsigned long) src; + unsigned long end = start + len; + unsigned long newlen = len; -unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long len) -{ - mtsp(get_user_space(), 1); - mtsp(get_user_space(), 2); - return pa_memcpy((void __force *)dst, (void __force *)src, len); -} + mtsp(get_user_space(), SR_TEMP1); + mtsp(get_kernel_space(), SR_TEMP2); + /* Check region is user accessible */ + while (start < end) { + if (!prober_user(SR_TEMP1, start)) { + newlen = (start - (unsigned long) src); + break; + } + start += PAGE_SIZE; + /* align to page boundry which may have different permission */ + start = PAGE_ALIGN_DOWN(start); + } + return len - newlen + pa_memcpy(dst, (void __force *)src, newlen); +} +EXPORT_SYMBOL(raw_copy_from_user); void * memcpy(void * dst,const void *src, size_t count) { - mtsp(get_kernel_space(), 1); - mtsp(get_kernel_space(), 2); + mtsp(get_kernel_space(), SR_TEMP1); + mtsp(get_kernel_space(), SR_TEMP2); pa_memcpy(dst, src, count); return dst; } -EXPORT_SYMBOL(raw_copy_in_user); EXPORT_SYMBOL(memcpy); bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) |