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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: QMGAIfFUoViqsKNa1VqDELQFQcsPWoTdAswjdSu6GrALC9RjV2hHUJ+UuMFqrkX7P41WD+pJ6FY19ddv6CZahQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR10MB6256 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-13_09,2025-02-13_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxlogscore=999 phishscore=0 malwarescore=0 mlxscore=0 spamscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2501170000 definitions=main-2502130165 X-Proofpoint-ORIG-GUID: 0jb8TPGaXXK3sAifVD9O1CsKMYpf-9pC X-Proofpoint-GUID: 0jb8TPGaXXK3sAifVD9O1CsKMYpf-9pC On 2/12/25 11:25 PM, Song Liu wrote: > On Wed, Feb 12, 2025 at 6:45 PM Josh Poimboeuf wrote: >> >> On Wed, Feb 12, 2025 at 06:36:04PM -0800, Song Liu wrote: >>>>> [ 81.261748] copy_process+0xfdc/0xfd58 [livepatch_special_static] >>>> >>>> Does that copy_process+0xfdc/0xfd58 resolve to this line in >>>> copy_process()? >>>> >>>> refcount_inc(¤t->signal->sigcnt); >>>> >>>> Maybe the klp rela reference to 'current' is bogus, or resolving to the >>>> wrong address somehow? >>> >>> It resolves the following line. >>> >>> p->signal->tty = tty_kref_get(current->signal->tty); >>> >>> I am not quite sure how 'current' should be resolved. >> >> Hm, on arm64 it looks like the value of 'current' is stored in the >> SP_EL0 register. So I guess that shouldn't need any relocations. >> >>> The size of copy_process (0xfd58) is wrong. It is only about >>> 5.5kB in size. Also, the copy_process function in the .ko file >>> looks very broken. I will try a few more things. > > When I try each step of kpatch-build, the copy_process function > looks reasonable (according to gdb-disassemble) in fork.o and > output.o. However, copy_process looks weird in livepatch-special-static.o, > which is generated by ld: > > ld -EL -maarch64linux -z norelro -z noexecstack > --no-warn-rwx-segments -T ././kpatch.lds -r -o > livepatch-special-static.o ./patch-hook.o ./output.o > > I have attached these files to the email. I am not sure whether > the email server will let them through. > > Indu, does this look like an issue with ld? > Sorry for the delay. Looks like there has been progress since and issue may be elsewhere, but: FWIW, I looked at the .sframe and .rela.sframe sections here, the data does look OK. I noted that there is no .sframe for copy_process () in output.o... I will take a look into it.