cve-2024-40915
Vulnerability from cvelistv5
Published
2024-07-12 12:24
Modified
2024-11-05 09:33
Severity ?
Summary
riscv: rewrite __kernel_map_pages() to fix sleeping in invalid context
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8661a7af04991201640863ad1a0983173f84b5eb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/919f8626099d9909b9a9620b05e8c8ab06581876
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d5257ceb19d92069195254866421f425aea42915
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fb1cf0878328fe75d47f0aed0a65b30126fcefc4
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8661a7af04991201640863ad1a0983173f84b5eb
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/919f8626099d9909b9a9620b05e8c8ab06581876
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d5257ceb19d92069195254866421f425aea42915
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fb1cf0878328fe75d47f0aed0a65b30126fcefc4
Impacted products
Vendor Product Version
Linux Linux Version: 5.7
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: rewrite __kernel_map_pages() to fix sleeping in invalid context\n\n__kernel_map_pages() is a debug function which clears the valid bit in page\ntable entry for deallocated pages to detect illegal memory accesses to\nfreed pages.\n\nThis function set/clear the valid bit using __set_memory(). __set_memory()\nacquires init_mm\u0027s semaphore, and this operation may sleep. This is\nproblematic, because  __kernel_map_pages() can be called in atomic context,\nand thus is illegal to sleep. An example warning that this causes:\n\nBUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1578\nin_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2, name: kthreadd\npreempt_count: 2, expected: 0\nCPU: 0 PID: 2 Comm: kthreadd Not tainted 6.9.0-g1d4c6d784ef6 #37\nHardware name: riscv-virtio,qemu (DT)\nCall Trace:\n[\u003cffffffff800060dc\u003e] dump_backtrace+0x1c/0x24\n[\u003cffffffff8091ef6e\u003e] show_stack+0x2c/0x38\n[\u003cffffffff8092baf8\u003e] dump_stack_lvl+0x5a/0x72\n[\u003cffffffff8092bb24\u003e] dump_stack+0x14/0x1c\n[\u003cffffffff8003b7ac\u003e] __might_resched+0x104/0x10e\n[\u003cffffffff8003b7f4\u003e] __might_sleep+0x3e/0x62\n[\u003cffffffff8093276a\u003e] down_write+0x20/0x72\n[\u003cffffffff8000cf00\u003e] __set_memory+0x82/0x2fa\n[\u003cffffffff8000d324\u003e] __kernel_map_pages+0x5a/0xd4\n[\u003cffffffff80196cca\u003e] __alloc_pages_bulk+0x3b2/0x43a\n[\u003cffffffff8018ee82\u003e] __vmalloc_node_range+0x196/0x6ba\n[\u003cffffffff80011904\u003e] copy_process+0x72c/0x17ec\n[\u003cffffffff80012ab4\u003e] kernel_clone+0x60/0x2fe\n[\u003cffffffff80012f62\u003e] kernel_thread+0x82/0xa0\n[\u003cffffffff8003552c\u003e] kthreadd+0x14a/0x1be\n[\u003cffffffff809357de\u003e] ret_from_fork+0xe/0x1c\n\nRewrite this function with apply_to_existing_page_range(). It is fine to\nnot have any locking, because __kernel_map_pages() works with pages being\nallocated/deallocated and those pages are not changed by anyone else in the\nmeantime."
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-40915\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-12T13:15:14.660\",\"lastModified\":\"2024-11-21T09:31:51.053\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nriscv: rewrite __kernel_map_pages() to fix sleeping in invalid context\\n\\n__kernel_map_pages() is a debug function which clears the valid bit in page\\ntable entry for deallocated pages to detect illegal memory accesses to\\nfreed pages.\\n\\nThis function set/clear the valid bit using __set_memory(). __set_memory()\\nacquires init_mm\u0027s semaphore, and this operation may sleep. This is\\nproblematic, because  __kernel_map_pages() can be called in atomic context,\\nand thus is illegal to sleep. An example warning that this causes:\\n\\nBUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1578\\nin_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2, name: kthreadd\\npreempt_count: 2, expected: 0\\nCPU: 0 PID: 2 Comm: kthreadd Not tainted 6.9.0-g1d4c6d784ef6 #37\\nHardware name: riscv-virtio,qemu (DT)\\nCall Trace:\\n[\u003cffffffff800060dc\u003e] dump_backtrace+0x1c/0x24\\n[\u003cffffffff8091ef6e\u003e] show_stack+0x2c/0x38\\n[\u003cffffffff8092baf8\u003e] dump_stack_lvl+0x5a/0x72\\n[\u003cffffffff8092bb24\u003e] dump_stack+0x14/0x1c\\n[\u003cffffffff8003b7ac\u003e] __might_resched+0x104/0x10e\\n[\u003cffffffff8003b7f4\u003e] __might_sleep+0x3e/0x62\\n[\u003cffffffff8093276a\u003e] down_write+0x20/0x72\\n[\u003cffffffff8000cf00\u003e] __set_memory+0x82/0x2fa\\n[\u003cffffffff8000d324\u003e] __kernel_map_pages+0x5a/0xd4\\n[\u003cffffffff80196cca\u003e] __alloc_pages_bulk+0x3b2/0x43a\\n[\u003cffffffff8018ee82\u003e] __vmalloc_node_range+0x196/0x6ba\\n[\u003cffffffff80011904\u003e] copy_process+0x72c/0x17ec\\n[\u003cffffffff80012ab4\u003e] kernel_clone+0x60/0x2fe\\n[\u003cffffffff80012f62\u003e] kernel_thread+0x82/0xa0\\n[\u003cffffffff8003552c\u003e] kthreadd+0x14a/0x1be\\n[\u003cffffffff809357de\u003e] ret_from_fork+0xe/0x1c\\n\\nRewrite this function with apply_to_existing_page_range(). It is fine to\\nnot have any locking, because __kernel_map_pages() works with pages being\\nallocated/deallocated and those pages are not changed by anyone else in the\\nmeantime.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: riscv: reescribe __kernel_map_pages() para arreglar el modo de dormir en un contexto no v\u00e1lido. __kernel_map_pages() es una funci\u00f3n de depuraci\u00f3n que borra el bit v\u00e1lido en la entrada de la tabla de p\u00e1ginas para p\u00e1ginas designadas para detectar accesos ilegales a la memoria de las p\u00e1ginas liberadas. Esta funci\u00f3n establece/borra el bit v\u00e1lido usando __set_memory(). __set_memory() adquiere el sem\u00e1foro de init_mm y esta operaci\u00f3n puede suspenderse. Esto es problem\u00e1tico, porque __kernel_map_pages() se puede llamar en un contexto at\u00f3mico y, por lo tanto, es ilegal dormir. Un ejemplo de advertencia de que esto causa: ERROR: funci\u00f3n inactiva llamada desde un contexto no v\u00e1lido en kernel/locking/rwsem.c:1578 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2, nombre: kthreadd preempt_count: 2, esperado: 0 CPU: 0 PID: 2 Comm: kthreadd No contaminado 6.9.0-g1d4c6d784ef6 #37 Nombre de hardware: riscv-virtio,qemu (DT) Seguimiento de llamadas: [] dump_backtrace+0x1c/0x24 [] show_stack+0x2c/0x38 [] dump_stack_lvl+0x5a/0x72 [] dump_stack+0x14/0x1c [] __might_resched+0x104/0x10e [] __might_sleep+0x3e/0x62 [] down_write+0x20/0x72 [] __set_memory+0x82/0x2fa [] __kernel_map_pages+0x5a/0xd4 [] __alloc_pages_bulk+0x3b2/0x43a [] __vmalloc_node_range+0x196/0x6ba [] copy_process+0x72c/0x17ec [] kernel_clone+0x60/0x2fe [] kernel_thread+0x82/0xa0 [] kthreadd+0x14a/0x1be [] _from_fork+0xe/0x1c Reescribe esta funci\u00f3n con apply_to_existing_page_range(). Est\u00e1 bien no tener ning\u00fan bloqueo, porque __kernel_map_pages() funciona con p\u00e1ginas que se asignan/desasignan y, mientras tanto, nadie m\u00e1s cambia esas p\u00e1ginas.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/8661a7af04991201640863ad1a0983173f84b5eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/919f8626099d9909b9a9620b05e8c8ab06581876\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5257ceb19d92069195254866421f425aea42915\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fb1cf0878328fe75d47f0aed0a65b30126fcefc4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8661a7af04991201640863ad1a0983173f84b5eb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/919f8626099d9909b9a9620b05e8c8ab06581876\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/d5257ceb19d92069195254866421f425aea42915\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/fb1cf0878328fe75d47f0aed0a65b30126fcefc4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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