diff options
| -rw-r--r-- | pkg/sentry/pgalloc/pgalloc.go | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/pkg/sentry/pgalloc/pgalloc.go b/pkg/sentry/pgalloc/pgalloc.go index 577e9306a..2b11ea4ae 100644 --- a/pkg/sentry/pgalloc/pgalloc.go +++ b/pkg/sentry/pgalloc/pgalloc.go @@ -180,6 +180,11 @@ type MemoryFileOpts struct { // notifications to determine when eviction is necessary. This option has // no effect unless DelayedEviction is DelayedEvictionEnabled. UseHostMemcgPressure bool + + // If ManualZeroing is true, MemoryFile must not assume that new pages + // obtained from the host are zero-filled, such that MemoryFile must manually + // zero newly-allocated pages. + ManualZeroing bool } // DelayedEvictionType is the type of MemoryFileOpts.DelayedEviction. @@ -432,6 +437,15 @@ func (f *MemoryFile) Allocate(length uint64, kind usage.MemoryKind) (platform.Fi // Mark selected pages as in use. fr := platform.FileRange{start, end} + if f.opts.ManualZeroing { + if err := f.forEachMappingSlice(fr, func(bs []byte) { + for i := range bs { + bs[i] = 0 + } + }); err != nil { + return platform.FileRange{}, err + } + } if !f.usage.Add(fr, usageInfo{ kind: kind, refs: 1, |