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Differential D17536

Flush L1 data cache on syscall return with an error.
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Authored by kib on Oct 12 2018, 4:22 PM.
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emaste
jhb
bwidawsk
mjg
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rS339507: amd64: flush L1 data cache on syscall return with an error.
Summary

A knob allows to select the flushing mode or turn it off/on.

It is curious that I was not able to measure statistically significant difference between flush enabled vs disabled using syscall_timing getuid.

List of ignored syscall errors should be updated.

The patch is based on the https://www.openwall.com/lists/kernel-hardening/2018/10/11/10

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rS FreeBSD src repository - subversion
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PathSize
head/
sys/
amd64/
amd64/
1 line
8 lines
7 lines
80 lines
ia32/
1 line
include/
4 lines
dev/
cpuctl/
3 lines

Diff 49375

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head/sys/amd64/amd64/initcpu.c

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head/sys/amd64/amd64/machdep.c

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head/sys/amd64/amd64/support.S

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head/sys/amd64/amd64/trap.c

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head/sys/amd64/ia32/ia32_syscall.c

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head/sys/amd64/include/md_var.h

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head/sys/dev/cpuctl/cpuctl.c

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