If kernel is 64bit and app is 32bit the size of ioctl structures exchanged Between userspace and kernel space will be different if you use data types Like pointer, long, size_t etc., Here is LWN article which explains the register_ioctl32_conversion routine That you need to use. http://lwn.net/Articles/115651/ Thx Kiran >-----Original Message----- >From: Frederic Temporelli [mailto:frederic.temporelli@xxxxxxxx] >Sent: Wednesday, March 08, 2006 11:42 AM >To: mingz@xxxxxxxxxxx >Cc: iet-dev; linux-mips; Shanthi Kiran Pendyala (skiranp) >Subject: Re: [Iscsitarget-devel] mips kernel 2.6.16rc1 + IET >0.4.13 - /dev/ietctl - ioctl unknown command > >Hi, > > >Here's the bypass (really ugly, just skip the following cmd >test and directly go to the vfs_ioctl call later in the func). >And yes, I'm using a 64bits kernel and app is 32 bits... > >= 8< ========================== >--- compat.c.git 2006-03-08 20:31:27.000000000 +0100 >+++ compat.c 2006-03-08 20:30:10.000000000 +0100 >@@ -400,6 +400,7 @@ asmlinkage long compat_sys_ioctl(unsigne > } else { > static int count; > >+ goto do_ioctl; > if (++count <= 50) > compat_ioctl_error(filp, fd, cmd, arg); > error = -EINVAL; >= 8< ========================== > >Regards >-- >Fred > > >Ming Zhang a écrit : > >>thanks for the catch. >> >>could u show us how u did that bypass? thanks. >> >>ming >> >> >> >>On Wed, 2006-03-08 at 19:13 +0100, Frederic Temporelli wrote: >> >> >>>Hello, >>> >>>I would like to report an ioctl issue using IET 0.4.13 >(iSCSI target) >>>and kernel 2.6.16-rc1, running on mips / SGI O2 >>> >>>The driver seems to load nicely, but there was no way to do ioctl on >>>the userspace device /dev/ietctl. >>>I got such messages in syslog: >>>Mar 4 16:47:16 o2 kernel: [4303606.514000] ioctl32(ietd:3448): >>>Unknown cmd fd(4) cmd(81046900){01} arg(7f942ab0) on /dev/ietctl >>> >>>=> I've been able to resolve the issue by adding a by-pass (goto >>>do_ioctl) in kernel compat_sys_ioctl function (fs/compat.c) and all >>>is working fine now. >>> >>>I don't know if such issue is related to mips only or is due to >>>changes >>>2.6.16 kernel >>>I've also did some tries on x86 with linux 2.6.15.5, all was working >>>fine without needing to change anything in the kernel. >>> >>>Did somebody report such issue with IET and recent kernel ? >>>May some people from linux-mips tell if such issue is mips specific ? >>> >>>Best regards. >>>-- >>>Fred >>> >>> >>> >>> >> >> >> >>------------------------------------------------------- >>This SF.Net email is sponsored by xPML, a groundbreaking scripting >>language that extends applications into web and mobile media. Attend >>the live webcast and join the prime developer group breaking >into this new coding territory! >>http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&; >dat=12164 >>2 _______________________________________________ >>Iscsitarget-devel mailing list >>Iscsitarget-devel@xxxxxxxxxxxxxxxxxxxxx >>https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel >> >> >> > > > >-- >No virus found in this outgoing message. >Checked by AVG Free Edition. >Version: 7.1.375 / Virus Database: 268.2.1/277 - Release Date: >08/03/2006 >
