CVE-2025-22010 in Linux
摘要
由 VulDB • 2026-05-23
在 Linux 内核中，已修复以下漏洞：
RDMA/hns：修复 bt 页面循环期间的软锁死问题
驱动程序在分配 bt 页面并将其与缓冲区页面映射时，会运行一个 for 循环。当分配大型缓冲区（例如超过 100GB 的 MR）时，可能需要大量的循环次数。这将导致软锁死：
watchdog: BUG: soft lockup - CPU#27 stuck for 22s! ... Call trace: hem_list_alloc_mid_bt+0x124/0x394 [hns_roce_hw_v2]
hns_roce_hem_list_request+0xf8/0x160 [hns_roce_hw_v2]
hns_roce_mtr_create+0x2e4/0x360 [hns_roce_hw_v2]
alloc_mr_pbl+0xd4/0x17c [hns_roce_hw_v2]
hns_roce_reg_user_mr+0xf8/0x190 [hns_roce_hw_v2]
ib_uverbs_reg_mr+0x118/0x290
watchdog: BUG: soft lockup - CPU#35 stuck for 23s! ... Call trace: hns_roce_hem_list_find_mtt+0x7c/0xb0 [hns_roce_hw_v2]
mtr_map_bufs+0xc4/0x204 [hns_roce_hw_v2]
hns_roce_mtr_create+0x31c/0x3c4 [hns_roce_hw_v2]
alloc_mr_pbl+0xb0/0x160 [hns_roce_hw_v2]
hns_roce_reg_user_mr+0x108/0x1c0 [hns_roce_hw_v2]
ib_uverbs_reg_mr+0x120/0x2bc
添加 cond_resched() 以修复这些循环期间的软锁死问题。为了不影响正常大小缓冲区的分配性能，将 100GB MR 的循环次数设置为调用 cond_resched() 的阈值。
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