RFC prctl: set-mm -- Rework interface
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- v1 RFC Latest2 patches 15 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | prctl: PR_SET_MM -- Factor out mmap_sem when update mm::exe_filekernel/ | +11 | 0 replies | |
| 2/2 | prctl: PR_SET_MM -- Introduce PR_SET_MM_MAP operationinclude/ kernel/ | +206 | 16 replies |
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Cover letter [RFC 0/2] prctl: set-mm -- Rework interface
Hi!
While been implementing c/r for user-namespaces we found that having CAP_SYS_RESOURCE requirement in prctl set-mm opcode is somewhat inconvenient and doesn't allow us to proceed restore of user-ns since we loose CAP_SYS_RESOURCE upon new user-ns creation.
So it looks better to provide new interface and deprecate old one leaving cap-sys-resource behind.
I would highly appreciate any comments on validate_prctl_map_locked() helper in second patch which tests for new struct mm_struct values being sane. I hope I didn't miss something obvious but as fas as I see even using some "bad" values can't affect the kernel since members are used mostly for statistics purpose.
Please take a look once time permit, any comments are highly appreciated.
Cyrill