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 :)
Andy Lutomirski (13):
x86/fault: Check user_mode(regs) when avoiding an mmap_sem deadlock
x86/fault: Check user_mode(regs) when validating a stack extension
x86/cpufeatures, x86/fault: Mark SMAP as disabled when configured out
x86/fault: Fold smap_violation() into do_user_addr_fault()
x86/fault: Fix SMAP #PF handling buglet for implicit supervisor
accesses
x86/fault: Improve the condition for signalling vs OOPSing
x86/fault: Make error_code sanitization more robust
x86/fault: Don't set thread.cr2, etc before OOPSing
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/include/asm/disabled-features.h | 8 +-
arch/x86/kernel/process_64.c | 5 +-
arch/x86/mm/fault.c | 224 ++++++++++++++---------
4 files changed, 150 insertions(+), 89 deletions(-)
--
2.17.2
