cve-2024-40915
Vulnerability from cvelistv5
Published
2024-07-12 12:24
Modified
2024-12-19 09:07
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: rewrite __kernel_map_pages() to fix sleeping in invalid context __kernel_map_pages() is a debug function which clears the valid bit in page table entry for deallocated pages to detect illegal memory accesses to freed pages. This function set/clear the valid bit using __set_memory(). __set_memory() acquires init_mm's semaphore, and this operation may sleep. This is problematic, because __kernel_map_pages() can be called in atomic context, and thus is illegal to sleep. An example warning that this causes: BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1578 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2, name: kthreadd preempt_count: 2, expected: 0 CPU: 0 PID: 2 Comm: kthreadd Not tainted 6.9.0-g1d4c6d784ef6 #37 Hardware name: riscv-virtio,qemu (DT) Call Trace: [<ffffffff800060dc>] dump_backtrace+0x1c/0x24 [<ffffffff8091ef6e>] show_stack+0x2c/0x38 [<ffffffff8092baf8>] dump_stack_lvl+0x5a/0x72 [<ffffffff8092bb24>] dump_stack+0x14/0x1c [<ffffffff8003b7ac>] __might_resched+0x104/0x10e [<ffffffff8003b7f4>] __might_sleep+0x3e/0x62 [<ffffffff8093276a>] down_write+0x20/0x72 [<ffffffff8000cf00>] __set_memory+0x82/0x2fa [<ffffffff8000d324>] __kernel_map_pages+0x5a/0xd4 [<ffffffff80196cca>] __alloc_pages_bulk+0x3b2/0x43a [<ffffffff8018ee82>] __vmalloc_node_range+0x196/0x6ba [<ffffffff80011904>] copy_process+0x72c/0x17ec [<ffffffff80012ab4>] kernel_clone+0x60/0x2fe [<ffffffff80012f62>] kernel_thread+0x82/0xa0 [<ffffffff8003552c>] kthreadd+0x14a/0x1be [<ffffffff809357de>] ret_from_fork+0xe/0x1c Rewrite this function with apply_to_existing_page_range(). It is fine to not have any locking, because __kernel_map_pages() works with pages being allocated/deallocated and those pages are not changed by anyone else in the meantime.
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: 5fde3db5eb028b95aeefa1ab192d36800414e8b8
Version: 5fde3db5eb028b95aeefa1ab192d36800414e8b8
Version: 5fde3db5eb028b95aeefa1ab192d36800414e8b8
Version: 5fde3db5eb028b95aeefa1ab192d36800414e8b8
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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's 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[<ffffffff800060dc>] dump_backtrace+0x1c/0x24\n[<ffffffff8091ef6e>] show_stack+0x2c/0x38\n[<ffffffff8092baf8>] dump_stack_lvl+0x5a/0x72\n[<ffffffff8092bb24>] dump_stack+0x14/0x1c\n[<ffffffff8003b7ac>] __might_resched+0x104/0x10e\n[<ffffffff8003b7f4>] __might_sleep+0x3e/0x62\n[<ffffffff8093276a>] down_write+0x20/0x72\n[<ffffffff8000cf00>] __set_memory+0x82/0x2fa\n[<ffffffff8000d324>] __kernel_map_pages+0x5a/0xd4\n[<ffffffff80196cca>] __alloc_pages_bulk+0x3b2/0x43a\n[<ffffffff8018ee82>] __vmalloc_node_range+0x196/0x6ba\n[<ffffffff80011904>] copy_process+0x72c/0x17ec\n[<ffffffff80012ab4>] kernel_clone+0x60/0x2fe\n[<ffffffff80012f62>] kernel_thread+0x82/0xa0\n[<ffffffff8003552c>] kthreadd+0x14a/0x1be\n[<ffffffff809357de>] 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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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[<ffffffff800060dc>] dump_backtrace+0x1c/0x24\\n[<ffffffff8091ef6e>] show_stack+0x2c/0x38\\n[<ffffffff8092baf8>] dump_stack_lvl+0x5a/0x72\\n[<ffffffff8092bb24>] dump_stack+0x14/0x1c\\n[<ffffffff8003b7ac>] __might_resched+0x104/0x10e\\n[<ffffffff8003b7f4>] __might_sleep+0x3e/0x62\\n[<ffffffff8093276a>] down_write+0x20/0x72\\n[<ffffffff8000cf00>] __set_memory+0x82/0x2fa\\n[<ffffffff8000d324>] __kernel_map_pages+0x5a/0xd4\\n[<ffffffff80196cca>] __alloc_pages_bulk+0x3b2/0x43a\\n[<ffffffff8018ee82>] __vmalloc_node_range+0x196/0x6ba\\n[<ffffffff80011904>] copy_process+0x72c/0x17ec\\n[<ffffffff80012ab4>] kernel_clone+0x60/0x2fe\\n[<ffffffff80012f62>] kernel_thread+0x82/0xa0\\n[<ffffffff8003552c>] kthreadd+0x14a/0x1be\\n[<ffffffff809357de>] 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 válido. __kernel_map_pages() es una función de depuración que borra el bit válido en la entrada de la tabla de páginas para páginas designadas para detectar accesos ilegales a la memoria de las páginas liberadas. Esta función establece/borra el bit válido usando __set_memory(). __set_memory() adquiere el semáforo de init_mm y esta operación puede suspenderse. Esto es problemático, porque __kernel_map_pages() se puede llamar en un contexto atómico y, por lo tanto, es ilegal dormir. Un ejemplo de advertencia de que esto causa: ERROR: función inactiva llamada desde un contexto no válido 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 función con apply_to_existing_page_range(). Está bien no tener ningún bloqueo, porque __kernel_map_pages() funciona con páginas que se asignan/desasignan y, mientras tanto, nadie más cambia esas páginas.\"}],\"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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Security Advisory comment format.

This schema specifies the format of a comment related to a security advisory.

UUIDv4 of the comment
UUIDv4 of the Vulnerability-Lookup instance
When the comment was created originally
When the comment was last updated
Title of the comment
Description of the comment
The identifier of the vulnerability (CVE ID, GHSA-ID, PYSEC ID, etc.).



Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.