linux-kernel - Re: [PATCH 1 of 4] mm: add a ptep_modify

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:	Thu, 19 Jun 2008 21:20:47 +0900
From:	"Akinobu Mita" <akinobu.mita@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>, benh@...nel.crashing.org,
	xen-devel <xen-devel@...ts.xensource.com>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	kvm-devel <kvm-devel@...ts.sourceforge.net>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	"Virtualization Mailing List" <virtualization@...ts.osdl.org>,
	"Hugh Dickins" <hugh@...itas.com>,
	"Thomas Gleixner" <tglx@...utronix.de>
Subject: Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction

> Below is the commit, it needed a small amount of massaging to apply the
> void * -> unsigned long * change in the x86/bitops topic.

So you need to change this line

> +#define CONST_MASK_ADDR BITOP_ADDR(addr + (nr>>3))

to be

#define CONST_MASK_ADDR BITOP_ADDR((void *)addr + (nr>>3))

or something like this. Otherwise it will get wrong address in set_bit

> -static inline void set_bit(int nr, volatile unsigned long *addr)
> +static inline void set_bit(unsigned int nr, volatile unsigned long *addr)
>  {
> -       asm volatile(LOCK_PREFIX "bts %1,%0" : ADDR : "Ir" (nr) : "memory");
> +       if (IS_IMMEDIATE(nr))
> +               asm volatile(LOCK_PREFIX "orb %1,%0" : CONST_MASK_ADDR : "i" (CONST_MASK) : "memory");
> +       else
> +               asm volatile(LOCK_PREFIX "bts %1,%0" : ADDR : "Ir" (nr) : "memory");
>  }
--
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/