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[Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address)
From: |
Tony.LI |
Subject: |
[Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address) |
Date: |
Fri, 04 Sep 2020 03:51:17 -0000 |
Hi,I found some problems, but I don't know if how to solve it better(I'm
not really familiar with the source code).
When I use ioctl() and use a structure like this:
struct drm_mode_card_res {
__u64 fb_id_ptr;
__u64 crtc_id_ptr;
__u64 connector_id_ptr;
__u64 encoder_id_ptr;
__u32 count_fbs;
....
};
Look,"fb_id_ptr" is a pointer,and apply for memory allocation through
malloc.But I use qemu-i386 on 64 bit ARM.As a result, my pointer has no problem
in QEMU, but it is wrong when I use ioctl(bad address).This address is actually
an address in QEMU, but it is not the correct address in a 64 bit machine.
Is there any better way to solve this problem?
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https://bugs.launchpad.net/bugs/1894071
Title:
qemu-i386-static ioctl return -14 (Bad Address)
Status in QEMU:
New
Bug description:
I use qemu-i386-static on 64 bit ARM.But I don't know how to solve some
problems.
First I added some ioctl operations.
Then I tried to do some DRM operations like test.c.
This is successful when I use qemu-x86_64-static,but it failed when I use
qemu-i386-static.
I can get some strace info like this:
403 openat(AT_FDCWD,"/dev/dri/card0",O_RDWR|O_LARGEFILE|O_CLOEXEC) = 4
403 ioctl(4,DRM_IOCTL_GET_CAP,{1,0}) = 0 ({1,1})
403 ioctl(4,DRM_IOCTL_MODE_GETRESOURCES,{0,0,0,0,0,0,0,0,0,0,0,0}) = 0
({0,0,0,0,0,2,2,2,0,16384,0,16384})
403 brk(NULL) = 0x40006000
403 brk(0x40027000) = 0x40027000
403 brk(0x40028000) = 0x40028000
403
ioctl(4,DRM_IOCTL_MODE_GETRESOURCES,{0,1073766816,1073766832,1073766848,0,2,2,2,0,16384,0,16384})
= -1 errno=14 (Bad address)
And there are similar errors in other self driven operations.
I want to know if it is QEMU's problem, so I hope to get some help.
Thank you!
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- [Bug 1894071] [NEW] qemu-i386-static ioctl return -14 (Bad Address), Tony.LI, 2020/09/03
- [Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address), Tony.LI, 2020/09/03
- [Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address), Tony.LI, 2020/09/03
- [Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address), Tony.LI, 2020/09/03
- [Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address), Tony.LI, 2020/09/03
- [Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address), Tony.LI, 2020/09/03
- [Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address), Tony.LI, 2020/09/03
- [Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address), Laurent Vivier, 2020/09/03
- [Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address),
Tony.LI <=
- [Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address), Tony.LI, 2020/09/04
- [Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address), Laurent Vivier, 2020/09/04
- [Bug 1894071] Re: qemu-i386-static ioctl return -14 (Bad Address), Thomas Huth, 2020/09/05