Bug 218953
| Summary: | copy_from_kernel_nofault_allowed() breaks MMUless devices | ||
|---|---|---|---|
| Product: | Memory Management | Reporter: | Yanjun Yang (yangyj.ee) |
| Component: | Other | Assignee: | Andrew Morton (akpm) |
| Status: | RESOLVED PATCH_ALREADY_AVAILABLE | ||
| Severity: | normal | CC: | yangyj.ee |
| Priority: | P3 | ||
| Hardware: | ARM | ||
| OS: | Linux | ||
| Kernel Version: | Subsystem: | ||
| Regression: | No | Bisected commit-id: | |
| Attachments: | fix address check bug for MMUless devices. | ||
Also sent a patch to the linux-arm-kernel maillist. "[PATCH] ARM: Remove address checking for MMUless devices". Wish this will help the process. (In reply to Yanjun Yang from comment #1) > Also sent a patch to the linux-arm-kernel maillist. "[PATCH] ARM: Remove > address checking for MMUless devices". Wish this will help the process. But I forget to CC anyone... My patch will be merged in v6.11-rc1. |
Created attachment 306450 [details] fix address check bug for MMUless devices. commit-id: 169f9102f9198b04afffa6164372a4ba4070f412 introduced copy_from_kernel_nofault_allowed() to check valid address. However, for devices without MMU, addr > TASK_SIZE will fail. I'm using stm32, not sure for others. attached patch fixed this bug for me.