Description
In the Linux kernel, the following vulnerability has been resolved: arm64: hibernate: mask DAIF before restoring hibernated kernel The arm64 hibernate code manages the exception masking in an unsound way, leading to potential crashes and/or warnings during resume. When a hibernation image is saved in `swsusp_arch_suspend()`, all DAIF exceptions are masked (by virtue of `local_daif_save()`), and the suspended image is saved assuming that all DAIF exceptions will remain masked when the image is restored. When a hibernation image is resumed by `swsusp_arch_resume()`, only interrupts are masked (by virtue of `local_irq_disable()` in `resume_target_kernel()`). When pseudo-NMI is enabled the DAIF.IF bits will be clear, and regardless of pseudo-NMI the DAIF.DA bits will be clear. This means that there are two problems: (1) It is possible to take Debug, SError, or pseudo-NMI exceptions during the resume process. This is unsafe, as during the resume process both the old ane new kernels will tranisently be in an inconsistent state, and swsusp_arch_suspend_exit() won't retain an executable mapping of any exception vectors. Any exception taken here will be fatal and silent. (2) When re-entering the resumed kernel, some DAIF bits will be clear unexpectedly. This permits Debug, SError, or pseudo-NMI exceptions to be taken for a short period while the resumed kernel is not yet in a consistent state. This is detected by CONFIG_ARM64_DEBUG_PRIORITY_MASKING. Avoid these issues by masking all DAIF exceptions during resume.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
82869ac57b5d3b550446932c918dbf2caf020c9e to < c9c671e9ab87b639720db8f7f8648bdf0f3bc8ecaffected82869ac57b5d3b550446932c918dbf2caf020c9e to < 099ad3edcef1d955d9f5d6aab16ae78ecdfd4cdaaffected82869ac57b5d3b550446932c918dbf2caf020c9e to < 716c41bd476334afb943308be9ff2142e34461b7affected82869ac57b5d3b550446932c918dbf2caf020c9e to < 5370853041a3cb53a125b77528586278f64b378baffected82869ac57b5d3b550446932c918dbf2caf020c9e to < 290c5b0c9fc0c61fb1c41421ed2394f955206ea0affected82869ac57b5d3b550446932c918dbf2caf020c9e to < 012823494e20c3cce622982ebd3fd6971be39ad2affected82869ac57b5d3b550446932c918dbf2caf020c9e to < d736ace2c491623c9ab5e73744085e93e9ae3ebeaffected82869ac57b5d3b550446932c918dbf2caf020c9e to < 684bde100117931f4c51c644a95f42f2dab041bcaffected
Linux Linux
Default version status: affected
4.7affected0 to < 4.7unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/c9c671e9ab87b639720db8f7f8648bdf0f3bc8ec ↗
- https://git.kernel.org/stable/c/099ad3edcef1d955d9f5d6aab16ae78ecdfd4cda ↗
- https://git.kernel.org/stable/c/716c41bd476334afb943308be9ff2142e34461b7 ↗
- https://git.kernel.org/stable/c/5370853041a3cb53a125b77528586278f64b378b ↗
- https://git.kernel.org/stable/c/290c5b0c9fc0c61fb1c41421ed2394f955206ea0 ↗
- https://git.kernel.org/stable/c/012823494e20c3cce622982ebd3fd6971be39ad2 ↗
- https://git.kernel.org/stable/c/d736ace2c491623c9ab5e73744085e93e9ae3ebe ↗
- https://git.kernel.org/stable/c/684bde100117931f4c51c644a95f42f2dab041bc ↗