FWIW, this breaks at least perf capability to resolve module symbols. Adding some more CCs for perf and module.
On 04/16/2018 07:51 AM, Thomas-Mich Richter wrote: > I just installed 4.16.0 and discovered the module .text address is > wrong. It happens on s390 and x86 platforms. I have not tested others. > > Here is the issue, I have used module qeth_l2 on s390 which is the > ethernet device driver: > > root@s35lp76 ~]# lsmod > Module Size Used by > qeth_l2 94208 1 > ... > > [root@s35lp76 ~]# cat /proc/modules | egrep '^qeth_l2' > qeth_l2 94208 1 - Live 0x000003ff80401000 <---- This is the correct address > in memory > [root@s35lp76 ~]# cat /sys/module/qeth_l2/sections/.text > 0x0000000018ea8363 <---- This is the wrong address > [root@s35lp76 ~]# > > File /sys/module/qeth_l2/sections/.text displays a very strange > address which is definitely wrong. It should be something like > 0x000003ff80401xxx. > > Same on x86. > > I have checked file kernel/module.c function add_sect_attrs() > and it calls module_sect_show() when the sysfs file is read. > And module_sect_show() uses > > sprintf(buf, "0x%pK\n", (void *)sattr->address); > > and my sysctl setting should be correct: > [root@s35lp76 linux]# sysctl -a | fgrep kernel.kptr_restrict > kernel.kptr_restrict = 0 > [root@s35lp76 linux]# > > I wonder if somebody else has seen this issue? > Ideas how to fix this? > > Thanks >
