linux-kernel - Re: [PATCH 1/2] devcgroup: always show unsigned major/minor num

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Date:	Tue, 08 Jul 2008 09:27:53 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [PATCH 1/2] devcgroup: always show unsigned major/minor num

Paul Menage wrote:
> On Fri, Jul 4, 2008 at 10:39 PM, Li Zefan <lizf@...fujitsu.com> wrote:
>>  # echo "b $((0x7fffffff)):$((0x80000000)) rwm" > devices.allow
>>  # cat devices.list
>>  b 214748364:-21474836 rwm
>>
>> though a major/minor number of 0x800000000 is meaningless, we
>> should not cast it to a negative value.
>>
>> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
>> ---
>>  security/device_cgroup.c |    4 ++--
>>  1 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/security/device_cgroup.c b/security/device_cgroup.c
>> index fd764a0..1e2e28a 100644
>> --- a/security/device_cgroup.c
>> +++ b/security/device_cgroup.c
>> @@ -222,7 +222,7 @@ static void devcgroup_destroy(struct cgroup_subsys *ss,
>>  #define DEVCG_DENY 2
>>  #define DEVCG_LIST 3
>>
>> -#define MAJMINLEN 10
>> +#define MAJMINLEN 13
>>  #define ACCLEN 4
>>
>>  static void set_access(char *acc, short access)
>> @@ -254,7 +254,7 @@ static void set_majmin(char *str, unsigned m)
>>        if (m == ~0)
>>                sprintf(str, "*");
> 
> Can't this just be strcat(str, "*")?
> 

No, but it can be strcpy(str, "*").

>>        else
>> -               snprintf(str, MAJMINLEN, "%d", m);
>> +               snprintf(str, MAJMINLEN, "%u", m);
> 
> I'm not sure that using snprintf() helps here over just sprintf() -
> we're not actually basing it on the available space in the string,
> we're just assuming there's enough space.
> 

Agreed. 
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