From 1129585a08baf58582c0da91e572cb29e3179acf Mon Sep 17 00:00:00 2001 From: Vitaly Mayatskikh Date: Wed, 2 Jul 2008 15:48:21 +0200 Subject: x86: introduce copy_user_handle_tail() routine Introduce generic C routine for handling necessary tail operations after protection fault in copy_*_user on x86. Signed-off-by: Vitaly Mayatskikh Acked-by: Linus Torvalds Signed-off-by: Ingo Molnar --- arch/x86/lib/usercopy_64.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'arch') diff --git a/arch/x86/lib/usercopy_64.c b/arch/x86/lib/usercopy_64.c index 0c89d1bb028..f4df6e7c718 100644 --- a/arch/x86/lib/usercopy_64.c +++ b/arch/x86/lib/usercopy_64.c @@ -158,3 +158,26 @@ unsigned long copy_in_user(void __user *to, const void __user *from, unsigned le } EXPORT_SYMBOL(copy_in_user); +/* + * Try to copy last bytes and clear the rest if needed. + * Since protection fault in copy_from/to_user is not a normal situation, + * it is not necessary to optimize tail handling. + */ +unsigned long +copy_user_handle_tail(char *to, char *from, unsigned len, unsigned zerorest) +{ + char c; + unsigned zero_len; + + for (; len; --len) { + if (__get_user_nocheck(c, from++, sizeof(char))) + break; + if (__put_user_nocheck(c, to++, sizeof(char))) + break; + } + + for (c = 0, zero_len = len; zerorest && zero_len; --zero_len) + if (__put_user_nocheck(c, to++, sizeof(char))) + break; + return len; +} -- cgit v1.2.3