CVE-2024-26850 in Linux
摘要
由 VulDB • 2026-06-08
在 Linux 内核中，已修复以下漏洞：
mm/debug_vm_pgtable: 修复 pud_advanced_tests 测试中的 BUG_ON
像 powerpc 这样的架构会添加调试检查，以确保仅找到 devmap PUD pte 条目。这些调试检查仅在启用 CONFIG_DEBUG_VM 时执行。此补丁标记了用于 PUD advanced test devmap pte 条目的 ptes，从而避免在如 ppc64 等架构上触发如下所示的调试检查：
WARNING: CPU: 2 PID: 1 at arch/powerpc/mm/book3s64/radix_pgtable.c:1382 radix__pud_hugepage_update+0x38/0x138 .... NIP [c0000000000a7004] radix__pud_hugepage_update+0x38/0x138
LR [c0000000000a77a8] radix__pudp_huge_get_and_clear+0x28/0x60
Call Trace: [c000000004a2f950] [c000000004a2f9a0] 0xc000000004a2f9a0 (unreliable)
[c000000004a2f980] [000d34c100000000] 0xd34c100000000
[c000000004a2f9a0] [c00000000206ba98] pud_advanced_tests+0x118/0x334
[c000000004a2fa40] [c00000000206db34] debug_vm_pgtable+0xcbc/0x1c48
[c000000004a2fc10] [c00000000000fd28] do_one_initcall+0x60/0x388
此外，还修复了：
kernel BUG at arch/powerpc/mm/book3s64/pgtable.c:202! ....
NIP [c000000000096510] pudp_huge_get_and_clear_full+0x98/0x174
LR [c00000000206bb34] pud_advanced_tests+0x1b4/0x334
Call Trace: [c000000004a2f950] [000d34c100000000] 0xd34c100000000 (unreliable)
[c000000004a2f9a0] [c00000000206bb34] pud_advanced_tests+0x1b4/0x334
[c000000004a2fa40] [c00000000206db34] debug_vm_pgtable+0xcbc/0x1c48
[c000000004a2fc10] [c00000000000fd28] do_one_initcall+0x60/0x388
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