CVE-2021-47549 (GCVE-0-2021-47549)
Vulnerability from cvelistv5
Published
2024-05-24 15:09
Modified
2026-05-11 13:56
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: faf0b2e5afe7dae072d2715763c7f992b612b628
Version: faf0b2e5afe7dae072d2715763c7f992b612b628
Version: faf0b2e5afe7dae072d2715763c7f992b612b628
Version: faf0b2e5afe7dae072d2715763c7f992b612b628
Version: faf0b2e5afe7dae072d2715763c7f992b612b628
Version: faf0b2e5afe7dae072d2715763c7f992b612b628
Version: faf0b2e5afe7dae072d2715763c7f992b612b628
Version: faf0b2e5afe7dae072d2715763c7f992b612b628
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsata_fsl: fix UAF in sata_fsl_port_stop when rmmod sata_fsl\n\nWhen the `rmmod sata_fsl.ko` command is executed in the PPC64 GNU/Linux,\na bug is reported:\n ==================================================================\n BUG: Unable to handle kernel data access on read at 0x80000800805b502c\n Oops: Kernel access of bad area, sig: 11 [#1]\n NIP [c0000000000388a4] .ioread32+0x4/0x20\n LR [80000000000c6034] .sata_fsl_port_stop+0x44/0xe0 [sata_fsl]\n Call Trace:\n  .free_irq+0x1c/0x4e0 (unreliable)\n  .ata_host_stop+0x74/0xd0 [libata]\n  .release_nodes+0x330/0x3f0\n  .device_release_driver_internal+0x178/0x2c0\n  .driver_detach+0x64/0xd0\n  .bus_remove_driver+0x70/0xf0\n  .driver_unregister+0x38/0x80\n  .platform_driver_unregister+0x14/0x30\n  .fsl_sata_driver_exit+0x18/0xa20 [sata_fsl]\n  .__se_sys_delete_module+0x1ec/0x2d0\n  .system_call_exception+0xfc/0x1f0\n  system_call_common+0xf8/0x200\n ==================================================================\n\nThe triggering of the BUG is shown in the following stack:\n\ndriver_detach\n  device_release_driver_internal\n    __device_release_driver\n      drv-\u003eremove(dev) --\u003e platform_drv_remove/platform_remove\n        drv-\u003eremove(dev) --\u003e sata_fsl_remove\n          iounmap(host_priv-\u003ehcr_base);\t\t\t\u003c---- unmap\n          kfree(host_priv);                             \u003c---- free\n      devres_release_all\n        release_nodes\n          dr-\u003enode.release(dev, dr-\u003edata) --\u003e ata_host_stop\n            ap-\u003eops-\u003eport_stop(ap) --\u003e sata_fsl_port_stop\n                ioread32(hcr_base + HCONTROL)           \u003c---- UAF\n            host-\u003eops-\u003ehost_stop(host)\n\nThe iounmap(host_priv-\u003ehcr_base) and kfree(host_priv) functions should\nnot be executed in drv-\u003eremove. These functions should be executed in\nhost_stop after port_stop. Therefore, we move these functions to the\nnew function sata_fsl_host_stop and bind the new function to host_stop."
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    "cveId": "CVE-2021-47549",
    "datePublished": "2024-05-24T15:09:53.292Z",
    "dateReserved": "2024-05-24T15:02:54.831Z",
    "dateUpdated": "2026-05-11T13:56:46.684Z",
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