61f01dd941
AMD CPUs don't reinitialize the SS descriptor on SYSRET, so SYSRET with
SS == 0 results in an invalid usermode state in which SS is apparently
equal to __USER_DS but causes #SS if used.
Work around the issue by setting SS to __KERNEL_DS __switch_to, thus
ensuring that SYSRET never happens with SS set to NULL.
This was exposed by a recent vDSO cleanup.
Fixes:
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.. | ||
mcheck | ||
microcode | ||
mtrr | ||
.gitignore | ||
amd.c | ||
bugs.c | ||
bugs_64.c | ||
centaur.c | ||
common.c | ||
cpu.h | ||
cyrix.c | ||
hypervisor.c | ||
intel.c | ||
intel_cacheinfo.c | ||
intel_pt.h | ||
Makefile | ||
match.c | ||
mkcapflags.sh | ||
mshyperv.c | ||
perf_event.c | ||
perf_event.h | ||
perf_event_amd.c | ||
perf_event_amd_ibs.c | ||
perf_event_amd_iommu.c | ||
perf_event_amd_iommu.h | ||
perf_event_amd_uncore.c | ||
perf_event_intel.c | ||
perf_event_intel_bts.c | ||
perf_event_intel_cqm.c | ||
perf_event_intel_ds.c | ||
perf_event_intel_lbr.c | ||
perf_event_intel_pt.c | ||
perf_event_intel_rapl.c | ||
perf_event_intel_uncore.c | ||
perf_event_intel_uncore.h | ||
perf_event_intel_uncore_nhmex.c | ||
perf_event_intel_uncore_snb.c | ||
perf_event_intel_uncore_snbep.c | ||
perf_event_knc.c | ||
perf_event_p4.c | ||
perf_event_p6.c | ||
perfctr-watchdog.c | ||
powerflags.c | ||
proc.c | ||
rdrand.c | ||
scattered.c | ||
topology.c | ||
transmeta.c | ||
umc.c | ||
vmware.c |