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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-56677

powerpc/fadump: Move fadump_cma_init to setup_arch() after initmem_init()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: powerpc/fadump: Move fadump_cma_init to setup_arch() after initmem_init() During early init CMA_MIN_ALIGNMENT_BYTES can be PAGE_SIZE, since pageblock_order is still zero and it gets initialized later during initmem_init() e.g. setup_arch() -> initmem_init() -> sparse_init() -> set_pageblock_order() One such use case where this causes issue is - early_setup() -> early_init_devtree() -> fadump_reserve_mem() -> fadump_cma_init() This causes CMA memory alignment check to be bypassed in cma_init_reserved_mem(). Then later cma_activate_area() can hit a VM_BUG_ON_PAGE(pfn & ((1 << order) - 1)) if the reserved memory area was not pageblock_order aligned. Fix it by moving the fadump_cma_init() after initmem_init(), where other such cma reservations also gets called. <stack trace> ============== page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10010 flags: 0x13ffff800000000(node=1|zone=0|lastcpupid=0x7ffff) CMA raw: 013ffff800000000 5deadbeef0000100 5deadbeef0000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: VM_BUG_ON_PAGE(pfn & ((1 << order) - 1)) ------------[ cut here ]------------ kernel BUG at mm/page_alloc.c:778! Call Trace: __free_one_page+0x57c/0x7b0 (unreliable) free_pcppages_bulk+0x1a8/0x2c8 free_unref_page_commit+0x3d4/0x4e4 free_unref_page+0x458/0x6d0 init_cma_reserved_pageblock+0x114/0x198 cma_init_reserved_areas+0x270/0x3e0 do_one_initcall+0x80/0x2f8 kernel_init_freeable+0x33c/0x530 kernel_init+0x34/0x26c ret_from_kernel_user_thread+0x14/0x1c

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 11ac3e87ce09c27f4587a8c4fe0829d814021a82 to < aabef6301dcf410dfd2b8759cd413b2a003c7e3faffected
  • 11ac3e87ce09c27f4587a8c4fe0829d814021a82 to < c5c1d1ef70834013fc3bd12b6a0f4664c6d75a74affected
  • 11ac3e87ce09c27f4587a8c4fe0829d814021a82 to < f551637fe9bf863386309e03f9d148d97f535ad1affected
  • 11ac3e87ce09c27f4587a8c4fe0829d814021a82 to < 7351c5a6507b4401aeecadb5959131410a339520affected
  • 11ac3e87ce09c27f4587a8c4fe0829d814021a82 to < 05b94cae1c47f94588c3e7096963c1007c4d9c1daffected

Linux Linux

Default version status: affected

  • 5.19affected
  • 0 to < 5.19unaffected
  • 6.1.120 to ≤ 6.1.*unaffected
  • 6.6.64 to ≤ 6.6.*unaffected
  • 6.11.11 to ≤ 6.11.*unaffected
  • 6.12.2 to ≤ 6.12.*unaffected
  • 6.13 to ≤ *unaffected

References