cve-2024-42126
Vulnerability from cvelistv5
Published
2024-07-30 07:46
Modified
2024-12-19 09:13
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: powerpc: Avoid nmi_enter/nmi_exit in real mode interrupt. nmi_enter()/nmi_exit() touches per cpu variables which can lead to kernel crash when invoked during real mode interrupt handling (e.g. early HMI/MCE interrupt handler) if percpu allocation comes from vmalloc area. Early HMI/MCE handlers are called through DEFINE_INTERRUPT_HANDLER_NMI() wrapper which invokes nmi_enter/nmi_exit calls. We don't see any issue when percpu allocation is from the embedded first chunk. However with CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK enabled there are chances where percpu allocation can come from the vmalloc area. With kernel command line "percpu_alloc=page" we can force percpu allocation to come from vmalloc area and can see kernel crash in machine_check_early: [ 1.215714] NIP [c000000000e49eb4] rcu_nmi_enter+0x24/0x110 [ 1.215717] LR [c0000000000461a0] machine_check_early+0xf0/0x2c0 [ 1.215719] --- interrupt: 200 [ 1.215720] [c000000fffd73180] [0000000000000000] 0x0 (unreliable) [ 1.215722] [c000000fffd731b0] [0000000000000000] 0x0 [ 1.215724] [c000000fffd73210] [c000000000008364] machine_check_early_common+0x134/0x1f8 Fix this by avoiding use of nmi_enter()/nmi_exit() in real mode if percpu first chunk is not embedded.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0db880fc865ffb522141ced4bfa66c12ab1fbb70
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0f37946c62c48a907625348cbc720a7a0c547d1e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2c78c9411e685dbc9eac8c2845111b03501975b8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8d3f83dfb23674540c827a8d65fba20aa300b252
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2afb26615adf6c3ceaaa7732aa839bcd587a057
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fb6675db04c4b79883373edc578d5df7bbc84848
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0db880fc865ffb522141ced4bfa66c12ab1fbb70
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0f37946c62c48a907625348cbc720a7a0c547d1e
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2c78c9411e685dbc9eac8c2845111b03501975b8
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8d3f83dfb23674540c827a8d65fba20aa300b252
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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We don't see any issue when\\npercpu allocation is from the embedded first chunk. However with\\nCONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK enabled there are chances where percpu\\nallocation can come from the vmalloc area.\\n\\nWith kernel command line \\\"percpu_alloc=page\\\" we can force percpu allocation\\nto come from vmalloc area and can see kernel crash in machine_check_early:\\n\\n[    1.215714] NIP [c000000000e49eb4] rcu_nmi_enter+0x24/0x110\\n[    1.215717] LR [c0000000000461a0] machine_check_early+0xf0/0x2c0\\n[    1.215719] --- interrupt: 200\\n[    1.215720] [c000000fffd73180] [0000000000000000] 0x0 (unreliable)\\n[    1.215722] [c000000fffd731b0] [0000000000000000] 0x0\\n[    1.215724] [c000000fffd73210] [c000000000008364] machine_check_early_common+0x134/0x1f8\\n\\nFix this by avoiding use of nmi_enter()/nmi_exit() in real mode if percpu\\nfirst chunk is not embedded.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-05T09:37:54.664Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-42126\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-05T09:37:54.664Z\", \"dateReserved\": \"2024-07-29T15:50:41.179Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-30T07:46:23.179Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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