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xen-devel
Re: [Xen-devel] [PATCH] fix x86_64 ia32 userspace support
Even with this fixed in the guest kernel I'd consider this a security hole if
so, since executing a sysenter instruction
in 32-bit user mode would then be a way to bring the whole system down. Jan
>>> Chris Wright <chrisw@xxxxxxxxxxxx> 07.02.06 09:46:19 >>>
Running ia32 binaries causes double fault on x86_64. We used to have
USE_INT80 defined, re-enabling fixes my systems.
ffffffff8011caa0 T ia32_sysenter_target
(XEN) CPU: 0
(XEN) RIP: 0010:[<ffffffff8011caa0>] ???
(XEN) RFLAGS: 0000000000010046 CONTEXT: hypervisor
(XEN) rax: 0000000000000021 rbx: 0000000000c201ae rcx: 0000000000000000
(XEN) rdx: 0000000000c22108 rsi: 0000000000c22008 rdi: 0000000000000002
(XEN) rbp: 00000000ffffc4ac rsp: 0000000000000000 r8: 0000000000000000
(XEN) r9: 0000000000000000 r10: 0000000000000000 r11: 0000000000000000
(XEN) r12: 0000000000000000 r13: 0000000000000000 r14: 0000000000000000
(XEN) r15: 0000000000000000 cr0: 000000008005003b cr3: 000000004b3a7000
(XEN) Xen stack trace from rsp=0000000000000000:
(XEN) Stack empty.
(XEN) Xen call trace:
(XEN) [<ffffffff8011caa0>] ???
(XEN)
(XEN) ************************************
(XEN) CPU0 FATAL TRAP 8 (double fault), ERROR_CODE 0000, IN INTERRUPT CONTEXT.
(XEN) System shutting down -- need manual reset.
(XEN) ************************************
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
diff -r 0defafc42af4 linux-2.6-xen-sparse/arch/x86_64/ia32/syscall32-xen.c
--- a/linux-2.6-xen-sparse/arch/x86_64/ia32/syscall32-xen.c Mon Feb 6
17:04:45 2006 +0100
+++ b/linux-2.6-xen-sparse/arch/x86_64/ia32/syscall32-xen.c Tue Feb 7
02:37:25 2006 -0500
@@ -14,6 +14,7 @@
#include <asm/tlbflush.h>
#include <asm/ia32_unistd.h>
+#define USE_INT80
#ifdef USE_INT80
extern unsigned char syscall32_int80[], syscall32_int80_end[];
#endif
diff -r 0defafc42af4
linux-2.6-xen-sparse/arch/x86_64/ia32/syscall32_syscall-xen.S
--- a/linux-2.6-xen-sparse/arch/x86_64/ia32/syscall32_syscall-xen.S Mon Feb
6 17:04:45 2006 +0100
+++ b/linux-2.6-xen-sparse/arch/x86_64/ia32/syscall32_syscall-xen.S Tue Feb
7 02:37:25 2006 -0500
@@ -2,6 +2,7 @@
.section ".init.data","aw"
+#define USE_INT80
#ifdef USE_INT80
.globl syscall32_int80
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