| Message ID | 20190227010544.597579-1-jeremy.linton@arm.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | arm64: add system vulnerability sysfs entries | expand |
Hi Jeremy, On Tue, Feb 26, 2019 at 07:05:34PM -0600, Jeremy Linton wrote: > Jeremy Linton (6): > arm64: Provide a command line to disable spectre_v2 mitigation > arm64: add sysfs vulnerability show for meltdown > arm64: Always enable spectrev2 vulnerability detection > arm64: add sysfs vulnerability show for spectre v2 > arm64: Always enable ssb vulnerability detection > arm64: add sysfs vulnerability show for speculative store bypass > > Marc Zyngier (2): > arm64: Advertise mitigation of Spectre-v2, or lack thereof > arm64: Use firmware to detect CPUs that are not affected by Spectre-v2 > > Mian Yousaf Kaukab (2): > arm64: add sysfs vulnerability show for spectre v1 > arm64: enable generic CPU vulnerabilites support The patches look fine to me (I'm giving them some testing now). However, It would be nice if we got the acks/reviewed-by tags from the people that looked at the previous series (Andre, Suzuki, Julien). You haven't included any tags in this series, I guess there were sufficient changes not to carry them over. If I get the acks by tomorrow, I'll queue them for 5.1, otherwise they'd have to wait for the next merging window. Thanks.
Hi Jeremy, > Jeremy Linton <jeremy.linton@arm.com> hat am 27. Februar 2019 um 02:05 geschrieben: > > > Arm64 machines should be displaying a human readable > vulnerability status to speculative execution attacks in > /sys/devices/system/cpu/vulnerabilities > > This series enables that behavior by providing the expected > functions. Those functions expose the cpu errata and feature > states, as well as whether firmware is responding appropriately > to display the overall machine status. This means that in a > heterogeneous machine we will only claim the machine is mitigated > or safe if we are confident all booted cores are safe or > mitigated. > here are the results for Raspberry Pi 3 B: l1tf:Not affected meltdown:Not affected spec_store_bypass:Not affected spectre_v1:Mitigation: __user pointer sanitization spectre_v2:Not affected Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Arm64 machines should be displaying a human readable vulnerability status to speculative execution attacks in /sys/devices/system/cpu/vulnerabilities This series enables that behavior by providing the expected functions. Those functions expose the cpu errata and feature states, as well as whether firmware is responding appropriately to display the overall machine status. This means that in a heterogeneous machine we will only claim the machine is mitigated or safe if we are confident all booted cores are safe or mitigated. v4->v5: Revert the changes to remove the CONFIG_EXPERT hidden options, but leave the detection paths building without #ifdef wrappers. Also remove the CONFIG_GENERIC_CPU_VULNERABILITIES #ifdefs as we are 'select'ing the option in the Kconfig. This allows us to keep all three variations of the CONFIG/enable/disable paths without a lot of (CONFIG_X || CONFIG_Y) checks. Various bits/pieces moved between the patches in an attempt to keep similar features/changes together. v3->v4: Drop the patch which selectivly exports sysfs entries Remove the CONFIG_EXPERT hidden options which allowed the kernel to be built without the vulnerability detection code. Pick Marc Z's patches which invert the white/black lists for spectrev2 and clean up the firmware detection logic. Document the existing kpti controls Add a nospectre_v2 option to boot time disable the mitigation v2->v3: Remove "Unknown" states, replace with further blacklists and default vulnerable/not affected states. Add the ability for an arch port to selectively export sysfs vulnerabilities. v1->v2: Add "Unknown" state to ABI/testing docs. Minor tweaks. Jeremy Linton (6): arm64: Provide a command line to disable spectre_v2 mitigation arm64: add sysfs vulnerability show for meltdown arm64: Always enable spectrev2 vulnerability detection arm64: add sysfs vulnerability show for spectre v2 arm64: Always enable ssb vulnerability detection arm64: add sysfs vulnerability show for speculative store bypass Marc Zyngier (2): arm64: Advertise mitigation of Spectre-v2, or lack thereof arm64: Use firmware to detect CPUs that are not affected by Spectre-v2 Mian Yousaf Kaukab (2): arm64: add sysfs vulnerability show for spectre v1 arm64: enable generic CPU vulnerabilites support .../admin-guide/kernel-parameters.txt | 8 +- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/cpufeature.h | 4 - arch/arm64/kernel/cpu_errata.c | 239 +++++++++++++----- arch/arm64/kernel/cpufeature.c | 47 +++- 5 files changed, 216 insertions(+), 83 deletions(-)