diff options
Diffstat (limited to 'arch/um/kernel/skas/uaccess.c')
| -rw-r--r-- | arch/um/kernel/skas/uaccess.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c index 6c76df96e858..a509be911026 100644 --- a/arch/um/kernel/skas/uaccess.c +++ b/arch/um/kernel/skas/uaccess.c @@ -189,11 +189,14 @@ static int strncpy_chunk_from_user(unsigned long from, int len, void *arg) return 0; } -long __strncpy_from_user(char *dst, const char __user *src, long count) +long strncpy_from_user(char *dst, const char __user *src, long count) { long n; char *ptr = dst; + if (!access_ok(src, 1)) + return -EFAULT; + if (uaccess_kernel()) { strncpy(dst, (__force void *) src, count); return strnlen(dst, count); @@ -205,7 +208,7 @@ long __strncpy_from_user(char *dst, const char __user *src, long count) 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) { @@ -236,10 +239,13 @@ static int strnlen_chunk(unsigned long str, int len, void *arg) return 0; } -long __strnlen_user(const void __user *str, long len) +long strnlen_user(const char __user *str, long len) { int count = 0, n; + if (!access_ok(str, 1)) + return -EFAULT; + if (uaccess_kernel()) return strnlen((__force char*)str, len) + 1; @@ -248,7 +254,7 @@ long __strnlen_user(const void __user *str, long len) return count + 1; return 0; } -EXPORT_SYMBOL(__strnlen_user); +EXPORT_SYMBOL(strnlen_user); /** * arch_futex_atomic_op_inuser() - Atomic arithmetic operation with constant |