In-Reply-To: <[email protected]>
On Sat, 29 Jul 2006 17:16:34 -0700, Andrew Morton wrote:
> espfix-code-cleanup.patch
After the fixup code does this:
movl %esp, %eax # pt_regs pointer
movl %esp, %edx
call patch_espfix_gdt
pushl $__ESPFIX_SS
CFI_ADJUST_CFA_OFFSET 4
pushl %eax
CFI_ADJUST_CFA_OFFSET 4
==> lss (%esp), %esp
CFI_ADJUST_CFA_OFFSET -8
jmp restore_nocheck
we are on a ring0 32-bit stack that's not zero-based. If an exception
occurs in that state, UNWIND_ESPFIX_STACK restores the proper kernel
SS and ESP but on return from the exception nothing restores the espfix
stack. I guess this isn't a problem now because exceptions in kernel
mode are fatal but a kernel debugger might have problems here?
--
Chuck
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