diff options
Diffstat (limited to 'arch/parisc/lib/memcpy.c')
| -rw-r--r-- | arch/parisc/lib/memcpy.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/arch/parisc/lib/memcpy.c b/arch/parisc/lib/memcpy.c index 5fc0c852c84c..69d65ffab312 100644 --- a/arch/parisc/lib/memcpy.c +++ b/arch/parisc/lib/memcpy.c @@ -12,6 +12,7 @@ #include <linux/module.h> #include <linux/compiler.h> #include <linux/uaccess.h> +#include <linux/mm.h> #define get_user_space() mfsp(SR_USER) #define get_kernel_space() SR_KERNEL @@ -32,9 +33,25 @@ EXPORT_SYMBOL(raw_copy_to_user); unsigned long raw_copy_from_user(void *dst, const void __user *src, unsigned long len) { + unsigned long start = (unsigned long) src; + unsigned long end = start + len; + unsigned long newlen = len; + mtsp(get_user_space(), SR_TEMP1); mtsp(get_kernel_space(), SR_TEMP2); - return pa_memcpy(dst, (void __force *)src, len); + + /* Check region is user accessible */ + if (start) + 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); |