Re: Potenitial security hole in the kernel

[Brett Frankenberger]

> 
> Hi folks,
> 
> Please correct me if i'm wrong but it seems to me that i've stumbled on
> really BIG security hole in the signal handling code.
> The problem IMO is that the signal handling code stores a processor context
> on the user-mode stack frame which is active while
> the signal handler is running. Then sys_sigreturn restores back the context
> from user mode stack...
> Suppose the signal handler modifies this context frame for example by
> storing into the PC slot address of the panic routine
> then when handler will exit  panic will be called with obvious results.
> 
> 
> Please CC your comments to me directly as i'm not subscibed to this list
> 
> Vadim Lebedev
> 
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