First published: Wed May 01 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: scsi: core: Fix unremoved procfs host directory regression Commit fc663711b944 ("scsi: core: Remove the /proc/scsi/${proc_name} directory earlier") fixed a bug related to modules loading/unloading, by adding a call to scsi_proc_hostdir_rm() on scsi_remove_host(). But that led to a potential duplicate call to the hostdir_rm() routine, since it's also called from scsi_host_dev_release(). That triggered a regression report, which was then fixed by commit be03df3d4bfe ("scsi: core: Fix a procfs host directory removal regression"). The fix just dropped the hostdir_rm() call from dev_release(). But it happens that this proc directory is created on scsi_host_alloc(), and that function "pairs" with scsi_host_dev_release(), while scsi_remove_host() pairs with scsi_add_host(). In other words, it seems the reason for removing the proc directory on dev_release() was meant to cover cases in which a SCSI host structure was allocated, but the call to scsi_add_host() didn't happen. And that pattern happens to exist in some error paths, for example. Syzkaller causes that by using USB raw gadget device, error'ing on usb-storage driver, at usb_stor_probe2(). By checking that path, we can see that the BadDevice label leads to a scsi_host_put() after a SCSI host allocation, but there's no call to scsi_add_host() in such path. That leads to messages like this in dmesg (and a leak of the SCSI host proc structure): usb-storage 4-1:87.51: USB Mass Storage device detected proc_dir_entry 'scsi/usb-storage' already registered WARNING: CPU: 1 PID: 3519 at fs/proc/generic.c:377 proc_register+0x347/0x4e0 fs/proc/generic.c:376 The proper fix seems to still call scsi_proc_hostdir_rm() on dev_release(), but guard that with the state check for SHOST_CREATED; there is even a comment in scsi_host_dev_release() detailing that: such conditional is meant for cases where the SCSI host was allocated but there was no calls to {add,remove}_host(), like the usb-storage case. This is what we propose here and with that, the error path of usb-storage does not trigger the warning anymore.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Software | Affected Version | How to fix |
---|---|---|
debian/linux | 5.10.218-1 5.10.221-1 6.1.94-1 6.1.99-1 6.9.10-1 6.9.12-1 | |
ubuntu/linux | <5.4.0-189.209 | 5.4.0-189.209 |
ubuntu/linux | <5.15.0-116.126 | 5.15.0-116.126 |
ubuntu/linux | <6.8.0-35.35 | 6.8.0-35.35 |
ubuntu/linux | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-aws | <5.4.0-1128.138 | 5.4.0-1128.138 |
ubuntu/linux-aws | <5.15.0-1065.71 | 5.15.0-1065.71 |
ubuntu/linux-aws | <6.8.0-1009.9 | 6.8.0-1009.9 |
ubuntu/linux-aws | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-aws-5.15 | <5.15.0-1065.71~20.04.1 | 5.15.0-1065.71~20.04.1 |
ubuntu/linux-aws-5.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-aws-5.4 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-aws-6.5 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-aws-fips | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-aws-hwe | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-azure | <5.4.0-1133.140 | 5.4.0-1133.140 |
ubuntu/linux-azure | <5.15.0-1068.77 | 5.15.0-1068.77 |
ubuntu/linux-azure | <6.8.0-1008.8 | 6.8.0-1008.8 |
ubuntu/linux-azure | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-azure-4.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-azure-5.15 | <5.15.0-1068.77~20.04.1 | 5.15.0-1068.77~20.04.1 |
ubuntu/linux-azure-5.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-azure-5.4 | <5.4.0-1133.140~18.04.1 | 5.4.0-1133.140~18.04.1 |
ubuntu/linux-azure-5.4 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-azure-6.5 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-azure-fde | <5.15.0-1068.77.1 | 5.15.0-1068.77.1 |
ubuntu/linux-azure-fde | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-azure-fde-5.15 | <5.15.0-1068.77~20.04.1.1 | 5.15.0-1068.77~20.04.1.1 |
ubuntu/linux-azure-fde-5.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-azure-fips | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-bluefield | <5.4.0-1088.95 | 5.4.0-1088.95 |
ubuntu/linux-bluefield | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-fips | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-gcp | <5.4.0-1132.141 | 5.4.0-1132.141 |
ubuntu/linux-gcp | <5.15.0-1064.72 | 5.15.0-1064.72 |
ubuntu/linux-gcp | <6.8.0-1008.9 | 6.8.0-1008.9 |
ubuntu/linux-gcp | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-gcp-4.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-gcp-5.15 | <5.15.0-1065.73~20.04.1 | 5.15.0-1065.73~20.04.1 |
ubuntu/linux-gcp-5.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-gcp-5.4 | <5.4.0-1132.141~18.04.1 | 5.4.0-1132.141~18.04.1 |
ubuntu/linux-gcp-5.4 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-gcp-6.5 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-gcp-fips | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-gke | <5.15.0-1062.68 | 5.15.0-1062.68 |
ubuntu/linux-gke | <6.8.0-1004.7 | 6.8.0-1004.7 |
ubuntu/linux-gke | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-gkeop | <5.4.0-1095.99 | 5.4.0-1095.99 |
ubuntu/linux-gkeop | <5.15.0-1048.55 | 5.15.0-1048.55 |
ubuntu/linux-gkeop | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-gkeop-5.15 | <5.15.0-1048.55~20.04.1 | 5.15.0-1048.55~20.04.1 |
ubuntu/linux-gkeop-5.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-hwe | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-hwe-5.15 | <5.15.0-116.126~20.04.1 | 5.15.0-116.126~20.04.1 |
ubuntu/linux-hwe-5.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-hwe-5.4 | <5.4.0-189.209~18.04.1 | 5.4.0-189.209~18.04.1 |
ubuntu/linux-hwe-5.4 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-hwe-6.5 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-ibm | <5.4.0-1075.80 | 5.4.0-1075.80 |
ubuntu/linux-ibm | <5.15.0-1058.61 | 5.15.0-1058.61 |
ubuntu/linux-ibm | <6.8.0-1006.6 | 6.8.0-1006.6 |
ubuntu/linux-ibm | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-ibm-5.15 | <5.15.0-1058.61~20.04.1 | 5.15.0-1058.61~20.04.1 |
ubuntu/linux-ibm-5.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-ibm-5.4 | <5.4.0-1075.80~18.04.1 | 5.4.0-1075.80~18.04.1 |
ubuntu/linux-ibm-5.4 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-intel | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-intel-iotg | <5.15.0-1060.66 | 5.15.0-1060.66 |
ubuntu/linux-intel-iotg | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-intel-iotg-5.15 | <5.15.0-1060.66~20.04.1 | 5.15.0-1060.66~20.04.1 |
ubuntu/linux-intel-iotg-5.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-iot | <5.4.0-1040.41 | 5.4.0-1040.41 |
ubuntu/linux-iot | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-kvm | <5.4.0-1116.123 | 5.4.0-1116.123 |
ubuntu/linux-kvm | <5.15.0-1062.67 | 5.15.0-1062.67 |
ubuntu/linux-kvm | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-laptop | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-lowlatency | <5.15.0-116.126 | 5.15.0-116.126 |
ubuntu/linux-lowlatency | <6.8.0-35.35.1 | 6.8.0-35.35.1 |
ubuntu/linux-lowlatency | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-lowlatency-hwe-5.15 | <5.15.0-116.126~20.04.1 | 5.15.0-116.126~20.04.1 |
ubuntu/linux-lowlatency-hwe-5.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-lowlatency-hwe-6.5 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-lts-xenial | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-nvidia | <5.15.0-1060.61 | 5.15.0-1060.61 |
ubuntu/linux-nvidia | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-nvidia-6.5 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-nvidia-6.8 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-nvidia-lowlatency | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-oem-6.5 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-oem-6.8 | <6.8.0-1006.6 | 6.8.0-1006.6 |
ubuntu/linux-oem-6.8 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-oracle | <5.4.0-1127.136 | 5.4.0-1127.136 |
ubuntu/linux-oracle | <5.15.0-1063.69 | 5.15.0-1063.69 |
ubuntu/linux-oracle | <6.8.0-1006.6 | 6.8.0-1006.6 |
ubuntu/linux-oracle | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-oracle-5.15 | <5.15.0-1063.69~20.04.1 | 5.15.0-1063.69~20.04.1 |
ubuntu/linux-oracle-5.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-oracle-5.4 | <5.4.0-1127.136~18.04.1 | 5.4.0-1127.136~18.04.1 |
ubuntu/linux-oracle-5.4 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-oracle-6.5 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-raspi | <5.4.0-1112.124 | 5.4.0-1112.124 |
ubuntu/linux-raspi | <5.15.0-1058.61 | 5.15.0-1058.61 |
ubuntu/linux-raspi | <6.8.0-1005.5 | 6.8.0-1005.5 |
ubuntu/linux-raspi | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-raspi-5.4 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-riscv | <6.8.0-35.35.1 | 6.8.0-35.35.1 |
ubuntu/linux-riscv | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-riscv-5.15 | <5.15.0-1061.65~20.04.1 | 5.15.0-1061.65~20.04.1 |
ubuntu/linux-riscv-5.15 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-riscv-6.5 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-starfive | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-starfive-6.5 | <6.9~<6.8.3 | 6.9~ 6.8.3 |
ubuntu/linux-xilinx-zynqmp | <5.4.0-1047.51 | 5.4.0-1047.51 |
ubuntu/linux-xilinx-zynqmp | <6.9~<6.8.3 | 6.9~ 6.8.3 |
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(Appears in the following advisories)