Fixed
Created: Jul 29, 2024
Updated: Aug 28, 2024
Resolved Date: Jul 29, 2024
Found In Version: 10.24.33.1
Fix Version: 10.24.33.1
Severity: Standard
Applicable for: Wind River Linux LTS 24
Component/s: Kernel
In the Linux kernel, the following vulnerability has been resolved:powerpc/pseries: Whitelist dtl slub object for copying to userspaceReading the dispatch trace log from /sys/kernel/debug/powerpc/dtl/cpu-*results in a BUG() when the config CONFIG_HARDENED_USERCOPY is enabled asshown below. kernel BUG at mm/usercopy.c:102! Oops: Exception in kernel mode, sig: 5 #1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries Modules linked in: xfs libcrc32c dm_service_time sd_mod t10_pi sg ibmvfc scsi_transport_fc ibmveth pseries_wdt dm_multipath dm_mirror dm_region_hash dm_log dm_mod fuse CPU: 27 PID: 1815 Comm: python3 Not tainted 6.10.0-rc3 #85 Hardware name: IBM,9040-MRX POWER10 (raw) 0x800200 0xf000006 of:IBM,FW1060.00 (NM1060_042) hv:phyp pSeries NIP: c0000000005d23d4 LR: c0000000005d23d0 CTR: 00000000006ee6f8 REGS: c000000120c078c0 TRAP: 0700 Not tainted (6.10.0-rc3) MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE> CR: 2828220f XER: 0000000e CFAR: c0000000001fdc80 IRQMASK: 0 [ ... GPRs omitted ... ] NIP [c0000000005d23d4] usercopy_abort+0x78/0xb0 LR [c0000000005d23d0] usercopy_abort+0x74/0xb0 Call Trace: usercopy_abort+0x74/0xb0 (unreliable) __check_heap_object+0xf8/0x120 check_heap_object+0x218/0x240 __check_object_size+0x84/0x1a4 dtl_file_read+0x17c/0x2c4 full_proxy_read+0x8c/0x110 vfs_read+0xdc/0x3a0 ksys_read+0x84/0x144 system_call_exception+0x124/0x330 system_call_vectored_common+0x15c/0x2ec --- interrupt: 3000 at 0x7fff81f3ab34Commit 6d07d1cd300f ("usercopy: Restrict non-usercopy caches to size 0")requires that only whitelisted areas in slab/slub objects can be copied touserspace when usercopy hardening is enabled using CONFIG_HARDENED_USERCOPY.Dtl contains hypervisor dispatch events which are expected to be read byprivileged users. Hence mark this safe for user access.Specify useroffset=0 and usersize=DISPATCH_LOG_BYTES to whitelist theentire object.
CREATE(Triage):(User=admin) [CVE-2024-41065 (https://nvd.nist.gov/vuln/detail/CVE-2024-41065)
