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[Qemu-devel] [Bug 629791] [NEW] sysret sets invalid ss
From: |
dascandy |
Subject: |
[Qemu-devel] [Bug 629791] [NEW] sysret sets invalid ss |
Date: |
Fri, 03 Sep 2010 20:03:17 -0000 |
Public bug reported:
I'm developing an OS. I use only sysret to enter user space. When an
interrupt occurred, it would GPF on iretq'ing from it. On investigating,
the cs on the stack is 0x2b (valid and correct). The ss on the stack is
0x20, which has a rpl of 0 which is incorrect. iretq checks that and
gpf's. Making the irq handler manually modify it to 0x23 fixes it
locally.
This happens on the non-kvm'ed qemu. I haven't tried the kvm'ed one.
Qemu version 0.12.5. I haven't tried with the current development
version either.
** Affects: qemu
Importance: Undecided
Status: New
** Tags: dpl ss sysret
--
sysret sets invalid ss
https://bugs.launchpad.net/bugs/629791
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Status in QEMU: New
Bug description:
I'm developing an OS. I use only sysret to enter user space. When an interrupt
occurred, it would GPF on iretq'ing from it. On investigating, the cs on the
stack is 0x2b (valid and correct). The ss on the stack is 0x20, which has a rpl
of 0 which is incorrect. iretq checks that and gpf's. Making the irq handler
manually modify it to 0x23 fixes it locally.
This happens on the non-kvm'ed qemu. I haven't tried the kvm'ed one. Qemu
version 0.12.5. I haven't tried with the current development version either.
- [Qemu-devel] [PATCH v2 00/19] Monitor: split HMP and QMP dispatch tables, Luiz Capitulino, 2010/09/30
- [Qemu-devel] [PATCH 01/19] Monitor: Introduce search_dispatch_table(), Luiz Capitulino, 2010/09/30
- [Qemu-devel] [PATCH 02/19] QMP: handle_qmp_command(): Move 'cmd' sanity check, Luiz Capitulino, 2010/09/30
- [Qemu-devel] [PATCH 03/19] QMP: Don't use do_info(), Luiz Capitulino, 2010/09/30
- [Qemu-devel] [PATCH 04/19] Monitor: Drop QMP bits from do_info(), Luiz Capitulino, 2010/09/30
- [Qemu-devel] [PATCH 05/19] Monitor: Drop is_async_return(), Luiz Capitulino, 2010/09/30
- [Qemu-devel] [PATCH 06/19] Monitor: Convert do_info() back to HMP, Luiz Capitulino, 2010/09/30
- [Qemu-devel] [PATCH 07/19] Monitor: Introduce the qmp-commands.hx file, Luiz Capitulino, 2010/09/30
- [Qemu-devel] [PATCH 09/19] QMP: Introduce command dispatch table, Luiz Capitulino, 2010/09/30
- [Qemu-devel] [PATCH 08/19] QMP: Introduce qmp_find_cmd(), Luiz Capitulino, 2010/09/30
- [Qemu-devel] [PATCH 10/19] QMP: Introduce query commands dispatch table, Luiz Capitulino, 2010/09/30