linux-kernel - Re: [PATCH v2] Alpha: unbreak osf_setsysinfo(SSI_NVPAIRS, [SSIN_UACPROC, UAC

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]

Message-ID: <4E45A16B.9060007@orcon.net.nz>
Date:	Sat, 13 Aug 2011 09:55:55 +1200
From:	Michael Cree <mcree@...on.net.nz>
To:	Sergei Trofimovich <slyfox@...too.org>
CC:	linux-kernel@...r.kernel.org, linux-alpha@...r.kernel.org,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>
Subject: Re: [PATCH v2] Alpha: unbreak osf_setsysinfo(SSI_NVPAIRS, [SSIN_UACPROC,
 UAC_SIGBUS])

On 13/08/11 09:01, Sergei Trofimovich wrote:
> The bug was accidentally found by the following program:
>     #include <asm/sysinfo.h>
>     #include <asm/unistd.h>
>     #include <sys/syscall.h>
>     static int setsysinfo(unsigned long op, void *buffer, unsigned long size,
>                           int *start, void *arg, unsigned long flag) {
>         return syscall(__NR_osf_setsysinfo, op, buffer, size, start, arg, flag);
>     }
> 
>     int main(int argc, char **argv) {
>         short x[10];
>         unsigned int buf[2] = { SSIN_UACPROC, UAC_SIGBUS, };
>         setsysinfo(SSI_NVPAIRS, buf, 1, 0, 0, 0);
> 
>         int  *y = (int*) (x+1);
>         *y = 0;
>         return 0;
>     }
> 
> The program shoud fail on SIGBUS, but didn't.
> 
> The patch is a second part of userspace flag fix:
>> commit 745dd2405e281d96c0a449103bdf6a895048f28c
>> Author: Michael Cree <mcree@...on.net.nz>
>> Date:   Mon Nov 30 22:44:40 2009 -0500
>>
>>    Alpha: Rearrange thread info flags fixing two regressions
>>
>>    Both regressions fixed by (1) rearranging TIF_NOTIFY_RESUME flag to be
>>    in lower 8 bits of the thread info flags, and (2) making sure that
>>    ALPHA_UAC_SHIFT matches the rearrangement of the thread info flags.
> 
> Deleted outdated out-of-sync 'UAC_SHIFT' (the cause of bug) in favour of 'ALPHA_UAC_SHIFT'.
> 
> Signed-off-by: Sergei Trofimovich <slyfox@...too.org>
> Cc: linux-alpha@...r.kernel.org
> Cc: Michael Cree <mcree@...on.net.nz>
> Cc: Richard Henderson <rth@...ddle.net>
> Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
> Cc: Matt Turner <mattst88@...il.com>
> ---
>  arch/alpha/include/asm/sysinfo.h     |    9 ---------
>  arch/alpha/include/asm/thread_info.h |    8 ++++----
>  arch/alpha/kernel/osf_sys.c          |    7 ++++---
>  3 files changed, 8 insertions(+), 16 deletions(-)

Looks good to me.

Acked-by: Michael Cree <mcree@...on.net.nz>

Thanks
Michael.
--
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/