https://github.com/torvalds/linux
Revision f6c4fd506cb626e4346aa81688f255e593a7c5a0 authored by Thomas Gleixner on 23 December 2017, 18:45:11 UTC, committed by Thomas Gleixner on 23 December 2017, 19:18:42 UTC
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>
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History 
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Tip revision: f6c4fd506cb626e4346aa81688f255e593a7c5a0 authored by Thomas Gleixner on 23 December 2017, 18:45:11 UTC
x86/cpu_entry_area: Prevent wraparound in setup_cpu_entry_area_ptes() on 32bit
x86/cpu_entry_area: Prevent wraparound in setup_cpu_entry_area_ptes() on 32bit
Tip revision: f6c4fd5
| File | Mode | Size |
|---|---|---|
| Documentation | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .get_maintainer.ignore | -rw-r--r-- | 31 bytes |
| .gitattributes | -rw-r--r-- | 30 bytes |
| .gitignore | -rw-r--r-- | 1.3 KB |
| .mailmap | -rw-r--r-- | 8.7 KB |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 96.2 KB |
| Kbuild | -rw-r--r-- | 2.2 KB |
| Kconfig | -rw-r--r-- | 287 bytes |
| MAINTAINERS | -rw-r--r-- | 420.4 KB |
| Makefile | -rw-r--r-- | 58.4 KB |
| README | -rw-r--r-- | 722 bytes |
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