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| author |   Thomas Gleixner <tglx@linutronix.de> | 2017-12-23 19:45:11 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-12-23 20:18:42 +0100 |
| commit | f6c4fd506cb626e4346aa81688f255e593a7c5a0 (patch) | |
| tree | 51356ab92d31c42e817b02ded05fe2dad0d17a81 /tools/testing/selftests/x86 | |
| parent | init: Invoke init_espfix_bsp() from mm_init() (diff) | |
| download | wireguard-linux-f6c4fd506cb626e4346aa81688f255e593a7c5a0.tar.xz wireguard-linux-f6c4fd506cb626e4346aa81688f255e593a7c5a0.zip | |
x86/cpu_entry_area: Prevent wraparound in setup_cpu_entry_area_ptes() on 32bit
The loop which populates the CPU entry area PMDs can wrap around on 32bit
machines when the number of CPUs is small.
It worked wonderful for NR_CPUS=64 for whatever reason and the moron who
wrote that code did not bother to test it with !SMP.
Check for the wraparound to fix it.
Fixes: 92a0f81d8957 ("x86/cpu_entry_area: Move it out of the fixmap")
Reported-by: kernel test robot <fengguang.wu@intel.com>
Signed-off-by: Thomas "Feels stupid" Gleixner <tglx@linutronix.de>
Tested-by: Borislav Petkov <bp@alien8.de>
Diffstat (limited to 'tools/testing/selftests/x86')
0 files changed, 0 insertions, 0 deletions