linux-kernel - Re: [PATCH 1/2] asm-generic: uaccess: allow arch to over-ride __get_user

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 20 Nov 2012 15:55:37 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Vineet.Gupta1@...opsys.com
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] asm-generic: uaccess: allow arch to over-ride __get_user_fn()

On Tuesday 20 November 2012, Vineet.Gupta1@...opsys.com wrote:
> +#ifndef __get_user_fn
>  static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
>  {
>         size = __copy_from_user(x, ptr, size);
>         return size ? -EFAULT : size;
>  }
>  
> +#define __get_user_fn(sz, u, k)        __get_user_fn(sz, u, k)
> +
> +#endif

This is ok as well. The idea with the asm-generic __copy_from_user()
implementation is to separate out the cases where you have just
a few bytes and handle them efficiently inline. If you don't want
to do that for some reason, overriding __get_user_fn works
as well. The resulting object code should be the same.

	Arnd
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/