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xen-devel
[Xen-devel] PaX Security w/ Kernel.org DomU 2.6.31.7
Greetings Xen Team,
I am trying to help the PaX Team (http://pax.grsecurity.net/) integrate
their PaX product into the Kernel.org’s domU kernel for 2.6.31.7. It
seems however, that we’ve run into a wall in the process. The
GRSecurity/PaX patch applies and compiles cleanly, but at early boot we get the
page fault below. The PaX Team has narrowed down the cause of the error to xen_setup_kernel_pagetable
while establishing the new pgd. It seems as if during the initial page table
setup the pgd had become completely empty and on return from the hypervisor
everything triggers various page faults and kills the guest kernel. Can
anyone describe what happens to the pgd during this phase? Also, does anyone
know how to get printk or print any information from the guest kernel at this
early stage?
Thanks in advance for any help you can offer.
John A.
Page Fault Follows:
(XEN) Unhandled page
fault in domain 26 on VCPU 0 (ec=0000)
(XEN) Pagetable walk from 0000000000000028:
(XEN) L4[0x000] = 0000000000000000 ffffffffffffffff
(XEN) domain_crash_sync called from entry.S
(XEN) Domain 26 (vcpu#0) crashed on cpu#4:
(XEN) ----[ Xen-3.1.3 x86_64 debug=y Not tainted ]----
(XEN) CPU: 4
(XEN) RIP: e033:[<ffffffff81018496>]
(XEN) RFLAGS: 0000000000000282 CONTEXT: guest
(XEN) rax: 0000000000521109 rbx: 0000000000000000
rcx: 0000000000000020
(XEN) rdx: ffffffff82ba6000 rsi: 00000000deadbeef
rdi: 0000000000000000
(XEN) rbp: 0000000000000000 rsp: ffffffff81601f50
r8: 0000000000000000
(XEN) r9: ffffffff81817283 r10: ffffffff8102f528
r11: ffffffff81004280
(XEN) r12: 0000000000000000 r13: 0000000000000000
r14: 0000000000000000
(XEN) r15: 0000000000000000 cr0: 000000008005003b
cr4: 00000000000006b0
(XEN) cr3: 0000000503189000 cr2: 0000000000000028
(XEN) ds: 0000 es: 0000 fs: 0000 gs:
0000 ss: e02b cs: e033
(XEN) Guest stack trace from rsp=ffffffff81601f50:
(XEN) 0000000000000020 ffffffff81004280 0000000000000000
ffffffff81018496
(XEN) 000000010000e030 0000000000010082 ffffffff81601f98
000000000000e02b
(XEN) 0000000000000007 ffffffff81004890 ffffffff8181719e
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) ffffffff81816c47 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
(XEN) 0000000000000000 0000000000000000 0000000000000000
0000000000000000
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