| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47549: sata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| sata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl |
| |
| When the `rmmod sata_fsl.ko` command is executed in the PPC64 GNU/Linux, |
| a bug is reported: |
| ================================================================== |
| BUG: Unable to handle kernel data access on read at 0x80000800805b502c |
| Oops: Kernel access of bad area, sig: 11 [#1] |
| NIP [c0000000000388a4] .ioread32+0x4/0x20 |
| LR [80000000000c6034] .sata_fsl_port_stop+0x44/0xe0 [sata_fsl] |
| Call Trace: |
| .free_irq+0x1c/0x4e0 (unreliable) |
| .ata_host_stop+0x74/0xd0 [libata] |
| .release_nodes+0x330/0x3f0 |
| .device_release_driver_internal+0x178/0x2c0 |
| .driver_detach+0x64/0xd0 |
| .bus_remove_driver+0x70/0xf0 |
| .driver_unregister+0x38/0x80 |
| .platform_driver_unregister+0x14/0x30 |
| .fsl_sata_driver_exit+0x18/0xa20 [sata_fsl] |
| .__se_sys_delete_module+0x1ec/0x2d0 |
| .system_call_exception+0xfc/0x1f0 |
| system_call_common+0xf8/0x200 |
| ================================================================== |
| |
| The triggering of the BUG is shown in the following stack: |
| |
| driver_detach |
| device_release_driver_internal |
| __device_release_driver |
| drv->remove(dev) --> platform_drv_remove/platform_remove |
| drv->remove(dev) --> sata_fsl_remove |
| iounmap(host_priv->hcr_base); <---- unmap |
| kfree(host_priv); <---- free |
| devres_release_all |
| release_nodes |
| dr->node.release(dev, dr->data) --> ata_host_stop |
| ap->ops->port_stop(ap) --> sata_fsl_port_stop |
| ioread32(hcr_base + HCONTROL) <---- UAF |
| host->ops->host_stop(host) |
| |
| The iounmap(host_priv->hcr_base) and kfree(host_priv) functions should |
| not be executed in drv->remove. These functions should be executed in |
| host_stop after port_stop. Therefore, we move these functions to the |
| new function sata_fsl_host_stop and bind the new function to host_stop. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47549 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.24 with commit faf0b2e5afe7dae072d2715763c7f992b612b628 and fixed in 4.4.294 with commit cdcd80292106df5cda325426e96495503e41f947 |
| Issue introduced in 2.6.24 with commit faf0b2e5afe7dae072d2715763c7f992b612b628 and fixed in 4.9.292 with commit 91ba94d3f7afca195b224f77a72044fbde1389ce |
| Issue introduced in 2.6.24 with commit faf0b2e5afe7dae072d2715763c7f992b612b628 and fixed in 4.14.257 with commit 325ea49fc43cbc03a5e1e37de8f0ca6357ced4b1 |
| Issue introduced in 2.6.24 with commit faf0b2e5afe7dae072d2715763c7f992b612b628 and fixed in 4.19.220 with commit 0769449b0a5eabc3545337217ae690e46673e73a |
| Issue introduced in 2.6.24 with commit faf0b2e5afe7dae072d2715763c7f992b612b628 and fixed in 5.4.164 with commit 77393806c76b6b44f1c44bd957788c8bd9152c45 |
| Issue introduced in 2.6.24 with commit faf0b2e5afe7dae072d2715763c7f992b612b628 and fixed in 5.10.84 with commit 4a46b2f5dce02539e88a300800812bd24a45e097 |
| Issue introduced in 2.6.24 with commit faf0b2e5afe7dae072d2715763c7f992b612b628 and fixed in 5.15.7 with commit adf098e2a8a1e1fc075d6a5ba2edd13cf7189082 |
| Issue introduced in 2.6.24 with commit faf0b2e5afe7dae072d2715763c7f992b612b628 and fixed in 5.16 with commit 6c8ad7e8cf29eb55836e7a0215f967746ab2b504 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2021-47549 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/ata/sata_fsl.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/cdcd80292106df5cda325426e96495503e41f947 |
| https://git.kernel.org/stable/c/91ba94d3f7afca195b224f77a72044fbde1389ce |
| https://git.kernel.org/stable/c/325ea49fc43cbc03a5e1e37de8f0ca6357ced4b1 |
| https://git.kernel.org/stable/c/0769449b0a5eabc3545337217ae690e46673e73a |
| https://git.kernel.org/stable/c/77393806c76b6b44f1c44bd957788c8bd9152c45 |
| https://git.kernel.org/stable/c/4a46b2f5dce02539e88a300800812bd24a45e097 |
| https://git.kernel.org/stable/c/adf098e2a8a1e1fc075d6a5ba2edd13cf7189082 |
| https://git.kernel.org/stable/c/6c8ad7e8cf29eb55836e7a0215f967746ab2b504 |
