Opened 5 years ago
Last modified 5 years ago
#760 accepted defect
vreg's can be modified by an arbitrary thread running on another CPU
| Reported by: | Jakub Jermář | Owned by: | Jakub Jermář |
|---|---|---|---|
| Priority: | major | Milestone: | |
| Component: | helenos/kernel/amd64 | Version: | mainline |
| Keywords: | Cc: | ||
| Blocker for: | Depends on: | ||
| See also: |
Description
On amd64 and ia32, vreg_init() creates a user-writable page for each CPU with the intention to offer this page via the FS, resp. GS, register as an array of virtual registers that can be used by uspace to implement eg. TLS. Unfortunately, this page can be accessed and written to also from other CPUs without any limits.
Change History (2)
comment:1 by , 5 years ago
| Owner: | set to |
|---|---|
| Status: | new → accepted |
comment:2 by , 5 years ago
| Milestone: | 0.8.0 |
|---|
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