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In the Linux kernel, the following vulnerability has been resolved:
fsdax: Fix infinite loop in dax_iomap_rw()
I got an infinite loop and a WARNING report when executing a tail command in virtiofs.
WARNING: CPU: 10 PID: 964 at fs/iomap/iter.c:34 iomap_iter+0x3a2/0x3d0 Modules linked in: CPU: 10 PID: 964 Comm: tail Not tainted 5.19.0-rc7 Call Trace: <TASK> dax_iomap_rw+0xea/0x620 ? __this_cpu_preempt_check+0x13/0x20 fuse_dax_read_iter+0x47/0x80 fuse_file_read_iter+0xae/0xd0 new_sync_read+0xfe/0x180 ? 0xffffffff81000000 vfs_read+0x14d/0x1a0 ksys_read+0x6d/0xf0 __x64_sys_read+0x1a/0x20 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd
The tail command will call read() with a count of 0. In this case, iomap_iter() will report this WARNING, and always return 1 which casuing the infinite loop in dax_iomap_rw().
Fixing by checking count whether is 0 in dax_iomap_rw().
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | Apr 28, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Apr 28, 2024 |
| Ubuntu | — | Upgrade linux-ibmUpgrade linux-azure-fde-5.15Upgrade linux-riscv-5.15Upgrade linux-lowlatencyUpgrade linux-intel-iotgUpgrade linux-kvmUpgrade linux-oracleUpgrade linux-gkeopUpgrade linux-azure-5.15Upgrade linux-gkeop-5.15Upgrade linux-azureUpgrade linux-nvidiaUpgrade linux-oracle-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-gcp-5.15Upgrade linuxUpgrade linux-awsUpgrade linux-lowlatency-hwe-5.15Upgrade linux-raspiUpgrade linux-realtimeUpgrade linux-gkeUpgrade linux-aws-5.15Upgrade linux-azure-fdeUpgrade linux-gcpUpgrade linux-hwe-5.15 | Nov 19, 2024 | Apr 28, 2024 |
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