Need help with stack smash

Orion Poplawski orion at cora.nwra.com
Thu Aug 27 19:59:42 UTC 2009


On 08/27/2009 01:42 PM, Roland McGrath wrote:
>> Note that this means what it says: if your expression contains a symbol
>> that goes out of scope before the change happens, then the watchpoint
>> will be forgotten, because the value of the expression will change from
>> being a value to being not-a-thing.  So you would need to set the watch
>> on the address in memory of what you're trying to watch, and not
>> necessarily on its symbolic name.
>
> Indeed.  Usually the convenient thing to do is:
>
> (gdb) p&foo->bar
> $22 = (int *) 0x12345
> (gdb) watch *$22


Thanks, but my trouble though is what to watch.  My thought was to watch 
the location of the guard variable that the stack protector code checks, 
but I have no idea how to find that out.

-- 
Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA/CoRA Division                    FAX: 303-415-9702
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Boulder, CO 80301              http://www.cora.nwra.com




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