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asm-generic: make copy_from_user() zero the destination properly 

commit 2545e5da080b4839dd859e3b09343a884f6ab0e3 upstream.

... in all cases, including the failing access_ok()

Note that some architectures using asm-generic/uaccess.h have
__copy_from_user() not zeroing the tail on failure halfway
through.  This variant works either way.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[wt: s/might_fault/might_sleep]

Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Al Viro 2016-08-17 16:36:37 -04:00 committed by syphyr
parent e8c99a287a
commit 96ad177e5e
1 changed files with 6 additions and 4 deletions
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10
include/asm-generic/uaccess.h
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@ -259,11 +259,13 @@ extern int __get_user_bad(void) __attribute__((noreturn));
static inline long copy_from_user(void *to,
const void __user * from, unsigned long n)
{
unsigned long res = n;
might_sleep();
if (access_ok(VERIFY_READ, from, n))
return __copy_from_user(to, from, n);
else
return n;
if (likely(access_ok(VERIFY_READ, from, n)))
res = __copy_from_user(to, from, n);
if (unlikely(res))
memset(to + (n - res), 0, res);
return res;
}
static inline long copy_to_user(void __user *to,