Re: [PATCH 1/2] ext4: Remove arbitrary block value in __es_remove_extent()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, Apr 15, 2014 at 08:08:21PM +0200, Lukas Czerner wrote:
> In __es_remove_extent() we're storing seemingly arbitrary value
> 0x7FDEADBEEF into block variable. I assume that the reason is just to
> initialize the variable before the use because the actual value does not
> matter at this point.
> 
> Just remove the arbitrary value and initialized block variable to zero
> which is much less suspicious.

The whole point was for the value to be suspicious.  That way, if
there is a bug, and we try to use that value, it is a large enough
value that for most storage devices, we will get an I/O error (because
the disk isn't that big :-) referencing that block value, and we'll
have a bit of a hint where that suspicious value might have come from.

       	      	     	   		   - Ted
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Reiser Filesystem Development]     [Ceph FS]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite National Park]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]     [Linux Media]

  Powered by Linux