Messages in this thread | | | From | Andy Lutomirski <> | Subject | [PATCH v2 0/5] x86/fault: #PF improvements, mostly related to USER bit | Date | Wed, 21 Nov 2018 15:11:21 -0800 |
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This series is a whole bunch of page fault cleanups, plus a couple of OOPS diagnostic improvements. The overall goals are to clean up handling of the faulting CPL, the USER bit in the error_code, and the log messages generated by #PF OOPSes.
This series can also be seen as CET preparation. CET introduces the WRUSS instruction, which is the very first way for CPL 0 code to cause a #PF fault with the USER bit set. Let's get the page fault code into shape before we start using WRUSS :)
Changes from v1: - Rebase on top of tip:x86/mm, now that a bunch of v1 was applied. The only material changes are that 'x86/fault: Check user_mode(regs) when validating a stack extension' is gone because the code it fixed has been deleted and that 'x86/fault: Remove sw_error_code' lost the hunk that changed the same code.
Andy Lutomirski (5): x86/fault: Remove sw_error_code x86/fault: Don't try to recover from an implicit supervisor access x86/oops: Show the correct CS value in show_regs() x86/fault: Decode page fault OOPSes better x86/vsyscall/64: Use X86_PF constants in the simulated #PF error code
arch/x86/entry/vsyscall/vsyscall_64.c | 2 +- arch/x86/kernel/process_64.c | 5 +- arch/x86/mm/fault.c | 144 +++++++++++++++++++------- 3 files changed, 108 insertions(+), 43 deletions(-)
-- 2.17.2
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