In the Linux kernel, the following vulnerability has been resolved:
mlxsw: thermal: Fix out-of-bounds memory accesses
Currently, mlxsw allows cooling states to be set above the maximum cooling state supported by the driver:
# cat /sys/class/thermal/thermal_zone2/cdev0/type mlxsw_fan # cat /sys/class/thermal/thermal_zone2/cdev0/max_state 10 # echo 18 > /sys/class/thermal/thermal_zone2/cdev0/cur_state # echo $? 0
This results in out-of-bounds memory accesses when thermal state transition statistics are enabled (CONFIG_THERMAL_STATISTICS=y), as the transition table is accessed with a too large index (state) [1].
According to the thermal maintainer, it is the responsibility of the driver to reject such operations [2].
Therefore, return an error when the state to be set exceeds the maximum cooling state supported by the driver.
To avoid dead code, as suggested by the thermal maintainer [3], partially revert commit a421ce088ac8 ("mlxsw: core: Extend cooling device with cooling levels") that tried to interpret these invalid cooling states (above the maximum) in a special way. The cooling levels array is not removed in order to prevent the fans going below 20% PWM, which would cause them to get stuck at 0% PWM.
[1] BUG: KASAN: slab-out-of-bounds in thermal_cooling_device_stats_update+0x271/0x290 Read of size 4 at addr ffff8881052f7bf8 by task kworker/0:0/5
CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.15.0-rc3-custom-45935-gce1adf704b14 #122 Hardware name: Mellanox Technologies Ltd. "MSN2410-CB2FO"/"SA000874", BIOS 4.6.5 03/08/2016 Workqueue: events_freezable_power_ thermal_zone_device_check Call Trace: dump_stack_lvl+0x8b/0xb3 print_address_description.constprop.0+0x1f/0x140 kasan_report.cold+0x7f/0x11b thermal_cooling_device_stats_update+0x271/0x290 __thermal_cdev_update+0x15e/0x4e0 thermal_cdev_update+0x9f/0xe0 step_wise_throttle+0x770/0xee0 thermal_zone_device_update+0x3f6/0xdf0 process_one_work+0xa42/0x1770 worker_thread+0x62f/0x13e0 kthread+0x3ee/0x4e0 ret_from_fork+0x1f/0x30
Allocated by task 1: kasan_save_stack+0x1b/0x40 __kasan_kmalloc+0x7c/0x90 thermal_cooling_device_setup_sysfs+0x153/0x2c0 __thermal_cooling_device_register.part.0+0x25b/0x9c0 thermal_cooling_device_register+0xb3/0x100 mlxsw_thermal_init+0x5c5/0x7e0 __mlxsw_core_bus_device_register+0xcb3/0x19c0 mlxsw_core_bus_device_register+0x56/0xb0 mlxsw_pci_probe+0x54f/0x710 local_pci_probe+0xc6/0x170 pci_device_probe+0x2b2/0x4d0 really_probe+0x293/0xd10 __driver_probe_device+0x2af/0x440 driver_probe_device+0x51/0x1e0 __driver_attach+0x21b/0x530 bus_for_each_dev+0x14c/0x1d0 bus_add_driver+0x3ac/0x650 driver_register+0x241/0x3d0 mlxsw_sp_module_init+0xa2/0x174 do_one_initcall+0xee/0x5f0 kernel_init_freeable+0x45a/0x4de kernel_init+0x1f/0x210 ret_from_fork+0x1f/0x30
The buggy address belongs to the object at ffff8881052f7800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 1016 bytes inside of 1024-byte region [ffff8881052f7800, ffff8881052f7c00) The buggy address belongs to the page: page:0000000052355272 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1052f0 head:0000000052355272 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x200000000010200(slab|head|node=0|zone=2) raw: 0200000000010200 ffffea0005034800 0000000300000003 ffff888100041dc0 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff8881052f7a80: 00 00 00 00 00 00 04 fc fc fc fc fc fc fc fc fc ffff8881052f7b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881052f7b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881052f7c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881052f7c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[2] https://lore.kernel.org/linux-pm/9aca37cb-1629-5c67- ---truncated---
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-rt-debug-kvmUpgrade kernel-zfcpdump-develUpgrade kernel-rt-coreUpgrade kernel-tools-libsUpgrade kernel-modules-extraUpgrade kernel-rt-debug-develUpgrade kernel-modulesUpgrade kernel-debug-develUpgrade kernel-debug-modules-extraUpgrade kernel-rt-modulesUpgrade kernel-debugUpgrade kernel-zfcpdumpUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-coreUpgrade kernel-headersUpgrade kernel-rt-debugUpgrade kernel-develUpgrade kernel-rt-develUpgrade kernel-rt-debug-modulesUpgrade kernel-debug-coreUpgrade kernel-docUpgrade kernel-rt-debug-modules-extraUpgrade kernel-debug-modulesUpgrade python3-perfUpgrade kernel-rt-kvmUpgrade kernel-toolsUpgrade kernelUpgrade kernel-zfcpdump-coreUpgrade kernel-tools-libs-develUpgrade perfUpgrade kernel-abi-stablelistsUpgrade kernel-zfcpdump-modulesUpgrade bpftoolUpgrade kernel-rtUpgrade kernel-cross-headersUpgrade kernel-rt-modules-extraUpgrade kernel-rt-debug-core | Sep 26, 2024 | May 22, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | May 22, 2024 |
| Oracle_linux | — | Upgrade kernel | Oct 16, 2024 | May 22, 2024 |
| Redhat_linux | — | No solution existsUpgrade kernel-rtUpgrade kernel | Sep 25, 2024 | May 22, 2024 |
| Rocky_linux | — | Upgrade kernel-rt-debugUpgrade kernel-develUpgrade perfUpgrade kernel-rt-coreUpgrade kernelUpgrade kernel-debugUpgrade kernel-debug-develUpgrade kernel-tools-libs-develUpgrade python3-perfUpgrade kernel-cross-headersUpgrade kernel-debuginfoUpgrade kernel-rt-modules-extraUpgrade perf-debuginfoUpgrade kernel-rt-debug-kvmUpgrade python3-perf-debuginfoUpgrade kernel-rt-debuginfo-common-x86_64Upgrade kernel-modules-extraUpgrade kernel-rtUpgrade kernel-debug-modules-extraUpgrade kernel-rt-debug-modules-extraUpgrade kernel-rt-debug-modulesUpgrade bpftool-debuginfoUpgrade kernel-toolsUpgrade kernel-rt-debug-coreUpgrade kernel-headersUpgrade kernel-debug-debuginfoUpgrade bpftoolUpgrade kernel-rt-debug-debuginfoUpgrade kernel-debug-modulesUpgrade kernel-rt-develUpgrade kernel-tools-debuginfoUpgrade kernel-modulesUpgrade kernel-rt-debuginfoUpgrade kernel-rt-modulesUpgrade kernel-tools-libsUpgrade kernel-rt-debug-develUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-debug-coreUpgrade kernel-coreUpgrade kernel-rt-kvm | Oct 2, 2024 | May 22, 2024 |
| Suse | — | Upgrade dtb-broadcomUpgrade kernel-rt-optionalUpgrade kernel-rt-livepatch-develUpgrade kernel-docs-htmlUpgrade dlm-kmp-64kbUpgrade dtb-marvellUpgrade kselftests-kmp-64kbUpgrade ocfs2-kmp-64kbUpgrade kernel-obs-buildUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-azure-vdsoUpgrade dtb-appleUpgrade kernel-debug-vdsoUpgrade kernel-source-azureUpgrade kernel-preemptUpgrade dtb-allwinnerUpgrade ocfs2-kmp-defaultUpgrade kernel-default-livepatchUpgrade dtb-exynosUpgrade kernel-default-base-rebuildUpgrade kernel-rt_debug-develUpgrade kernel-source-rtUpgrade dtb-caviumUpgrade kernel-rtUpgrade kernel-azureUpgrade kernel-default-livepatch-develUpgrade kernel-default-vdsoUpgrade kernel-64kb-extraUpgrade kernel-rt-extraUpgrade cluster-md-kmp-64kbUpgrade kernel-azure-develUpgrade dtb-sprdUpgrade kernel-rt_debugUpgrade kernel-azure-extraUpgrade dtb-nvidiaUpgrade kernel-default-baseUpgrade kernel-preempt-develUpgrade dtb-qcomUpgrade dlm-kmp-rtUpgrade kernel-rt-vdsoUpgrade kernel-source-vanillaUpgrade dtb-alteraUpgrade dtb-rockchipUpgrade dtb-socionextUpgrade gfs2-kmp-azureUpgrade kselftests-kmp-azureUpgrade kernel-defaultUpgrade kernel-azure-optionalUpgrade kernel-kvmsmall-vdsoUpgrade kernel-rt_debug-livepatch-develUpgrade dtb-lgUpgrade dtb-freescaleUpgrade reiserfs-kmp-64kbUpgrade gfs2-kmp-defaultUpgrade kernel-macrosUpgrade kernel-rt_debug-vdsoUpgrade reiserfs-kmp-azureUpgrade kernel-develUpgrade dlm-kmp-azureUpgrade kernel-rt-develUpgrade kernel-default-develUpgrade kernel-devel-rtUpgrade kernel-zfcpdumpUpgrade dtb-apmUpgrade kernel-sourceUpgrade cluster-md-kmp-rtUpgrade kernel-64kb-optionalUpgrade reiserfs-kmp-rtUpgrade kernel-debug-livepatch-develUpgrade ocfs2-kmp-azureUpgrade kernel-syms-azureUpgrade kernel-debug-develUpgrade kernel-64kbUpgrade dtb-hisiliconUpgrade kernel-debugUpgrade dtb-xilinxUpgrade kernel-azure-livepatch-develUpgrade kselftests-kmp-rtUpgrade kselftests-kmp-defaultUpgrade kernel-symsUpgrade cluster-md-kmp-defaultUpgrade dlm-kmp-defaultUpgrade kernel-rt-livepatchUpgrade kernel-64kb-livepatch-develUpgrade dtb-amazonUpgrade kernel-syms-rtUpgrade kernel-kvmsmall-develUpgrade reiserfs-kmp-defaultUpgrade dtb-armUpgrade dtb-renesasUpgrade kernel-default-extraUpgrade kernel-devel-azureUpgrade kernel-default-optionalUpgrade gfs2-kmp-64kbUpgrade kernel-docsUpgrade dtb-mediatekUpgrade ocfs2-kmp-rtUpgrade kernel-obs-qaUpgrade kernel-kvmsmallUpgrade kernel-64kb-develUpgrade gfs2-kmp-rtUpgrade dtb-amlogicUpgrade dtb-amdUpgrade cluster-md-kmp-azure | Aug 9, 2024 | May 22, 2024 |
| Ubuntu | — | Upgrade linux-raspiUpgrade linux-azure-fipsUpgrade linux-aws-5.4Upgrade linux-gkeopUpgrade linux-azure-5.4Upgrade linuxUpgrade linux-azureUpgrade linux-oracle-5.4Upgrade linux-raspi-5.4Upgrade linux-aws-fipsUpgrade linux-gcp-fipsUpgrade linux-gcpUpgrade linux-ibmUpgrade linux-awsUpgrade linux-kvmUpgrade linux-gcp-5.4Upgrade linux-fipsUpgrade linux-oracleUpgrade linux-bluefieldUpgrade linux-hwe-5.4 | Nov 19, 2024 | May 22, 2024 |
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub