lkml.org 
[lkml]   [2007]   [Apr]   [7]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateSat, 07 Apr 2007 13:54:30 +0200
FromEric Dumazet <>
SubjectRe: [PATCH, take4] FUTEX : new PRIVATE futexes
Jakub Jelinek a écrit :
> On Sat, Apr 07, 2007 at 10:43:39AM +0200, Eric Dumazet wrote:
>> get_futex_key() does a check against sizeof(u32) regardless of futex being 64bits or not.
>> So it is possible a 64bit futex spans two pages of memory...
> 
> That would be a user bug.  32-bit futexes have to be 32-bit aligned, 64-bit
> futexes have to be 64-bit aligned.

I am not sure what you want to say.

User doing sys_futex64(0x......FFC, FUTEX_WAKE_OP, ...) and crashing kernel or 
corrupting data is ok because its a user bug ?

User is allowed to do anything, kernel must check and protect innocents.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-04-07 11:57    [from the cache]
©2003-2008