CVE-2024-41065

In the Linux kernel, the following vulnerability has been resolved:

powerpc/pseries: Whitelist dtl slub object for copying to userspace

Reading the dispatch trace log from /sys/kernel/debug/powerpc/dtl/cpu-* results in a BUG() when the config CONFIG_HARDENED_USERCOPY is enabled as shown 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 0x7fff81f3ab34

Commit 6d07d1cd300f (usercopy: Restrict non-usercopy caches to size 0) requires that only whitelisted areas in slab/slub objects can be copied to userspace when usercopy hardening is enabled using CONFIG_HARDENED_USERCOPY. Dtl contains hypervisor dispatch events which are expected to be read by privileged users. Hence mark this safe for user access. Specify useroffset=0 and usersize=DISPATCH_LOG_BYTES to whitelist the entire object.

Affected Software

References

• https://git.kernel.org/stable/c/0f5892212c27be31792ef1daa89c8dac1b3047e4
• https://git.kernel.org/stable/c/1a14150e1656f7a332a943154fc486504db4d586
• https://git.kernel.org/stable/c/1ee68686d1e2a5da35d5650be0be1ce06fe2ceb2
• https://git.kernel.org/stable/c/6b16098148ea58a67430d90e20476be2377c3acd
• https://git.kernel.org/stable/c/a7b952941ce07e1e7a2cafd08c64a98e14f553e6
• https://git.kernel.org/stable/c/e512a59b472684d8585125101ab03b86c2c1348a
• https://git.kernel.org/stable/c/e59822f9d700349cd17968d22c979db23a2d347f