CVE-2024-41065: powerpc/pseries: Whitelist dtl slub object for copying to userspace
First published: Mon Jul 29 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.4.281 | 5.4.281 |
| redhat/kernel | <5.10.223 | 5.10.223 |
| redhat/kernel | <5.15.164 | 5.15.164 |
| redhat/kernel | <6.1.101 | 6.1.101 |
| redhat/kernel | <6.6.42 | 6.6.42 |
| redhat/kernel | <6.9.11 | 6.9.11 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- 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
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-41065
- https://nvd.nist.gov/vuln/detail/CVE-2024-41065
- https://launchpad.net/bugs/cve/CVE-2024-41065
- https://security-tracker.debian.org/tracker/CVE-2024-41065
- https://ubuntu.com/security/CVE-2024-41065
- https://git.kernel.org/linus/1a14150e1656f7a332a943154fc486504db4d586
- https://lore.kernel.org/linux-cve-announce/2024072907-CVE-2024-41065-2501@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2301615
- https://access.redhat.com/errata/RHSA-2024:7000
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2300440
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