diff options
Diffstat (limited to 'arch/um/kernel/skas/uaccess.c')
| -rw-r--r-- | arch/um/kernel/skas/uaccess.c | 47 |
1 files changed, 17 insertions, 30 deletions
diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c index 4ffb644d6c07..85ac8adb069b 100644 --- a/arch/um/kernel/skas/uaccess.c +++ b/arch/um/kernel/skas/uaccess.c @@ -87,10 +87,10 @@ static int do_op_one_page(unsigned long addr, int len, int is_write, return n; } -static int buffer_op(unsigned long addr, int len, int is_write, - int (*op)(unsigned long, int, void *), void *arg) +static long buffer_op(unsigned long addr, int len, int is_write, + int (*op)(unsigned long, int, void *), void *arg) { - int size, remain, n; + long size, remain, n; size = min(PAGE_ALIGN(addr) - addr, (unsigned long) len); remain = len; @@ -139,18 +139,16 @@ static int copy_chunk_from_user(unsigned long from, int len, void *arg) return 0; } -int copy_from_user(void *to, const void __user *from, int n) +long __copy_from_user(void *to, const void __user *from, unsigned long n) { if (segment_eq(get_fs(), KERNEL_DS)) { memcpy(to, (__force void*)from, n); return 0; } - return access_ok(VERIFY_READ, from, n) ? - buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to): - n; + return buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to); } -EXPORT_SYMBOL(copy_from_user); +EXPORT_SYMBOL(__copy_from_user); static int copy_chunk_to_user(unsigned long to, int len, void *arg) { @@ -161,18 +159,16 @@ static int copy_chunk_to_user(unsigned long to, int len, void *arg) return 0; } -int copy_to_user(void __user *to, const void *from, int n) +long __copy_to_user(void __user *to, const void *from, unsigned long n) { if (segment_eq(get_fs(), KERNEL_DS)) { memcpy((__force void *) to, from, n); return 0; } - return access_ok(VERIFY_WRITE, to, n) ? - buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from) : - n; + return buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from); } -EXPORT_SYMBOL(copy_to_user); +EXPORT_SYMBOL(__copy_to_user); static int strncpy_chunk_from_user(unsigned long from, int len, void *arg) { @@ -188,9 +184,9 @@ static int strncpy_chunk_from_user(unsigned long from, int len, void *arg) return 0; } -int strncpy_from_user(char *dst, const char __user *src, int count) +long __strncpy_from_user(char *dst, const char __user *src, long count) { - int n; + long n; char *ptr = dst; if (segment_eq(get_fs(), KERNEL_DS)) { @@ -198,16 +194,13 @@ int strncpy_from_user(char *dst, const char __user *src, int count) return strnlen(dst, count); } - if (!access_ok(VERIFY_READ, src, 1)) - return -EFAULT; - n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user, &ptr); if (n != 0) return -EFAULT; return strnlen(dst, count); } -EXPORT_SYMBOL(strncpy_from_user); +EXPORT_SYMBOL(__strncpy_from_user); static int clear_chunk(unsigned long addr, int len, void *unused) { @@ -215,22 +208,16 @@ static int clear_chunk(unsigned long addr, int len, void *unused) return 0; } -int __clear_user(void __user *mem, int len) -{ - return buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL); -} - -int clear_user(void __user *mem, int len) +unsigned long __clear_user(void __user *mem, unsigned long len) { if (segment_eq(get_fs(), KERNEL_DS)) { memset((__force void*)mem, 0, len); return 0; } - return access_ok(VERIFY_WRITE, mem, len) ? - buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL) : len; + return buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL); } -EXPORT_SYMBOL(clear_user); +EXPORT_SYMBOL(__clear_user); static int strnlen_chunk(unsigned long str, int len, void *arg) { @@ -244,7 +231,7 @@ static int strnlen_chunk(unsigned long str, int len, void *arg) return 0; } -int strnlen_user(const void __user *str, int len) +long __strnlen_user(const void __user *str, long len) { int count = 0, n; @@ -256,4 +243,4 @@ int strnlen_user(const void __user *str, int len) return count + 1; return 0; } -EXPORT_SYMBOL(strnlen_user); +EXPORT_SYMBOL(__strnlen_user); |