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author | gVisor bot <gvisor-bot@google.com> | 2020-06-09 18:18:51 +0000 |
---|---|---|
committer | gVisor bot <gvisor-bot@google.com> | 2020-06-09 18:18:51 +0000 |
commit | 9d4fc7c8805367764e015f18fb9b306fa870a95a (patch) | |
tree | 6626cb6fd50223a9f012dc770fe83aa14e6418e3 /pkg/sentry/pgalloc/pgalloc.go | |
parent | 1497e757ae503fdbe3877550dcb93b1b6e42c668 (diff) | |
parent | ecff24930cb2dd5b0910da859d6e712f2f1d32c4 (diff) |
Merge release-20200522.0-101-gecff24930 (automated)
Diffstat (limited to 'pkg/sentry/pgalloc/pgalloc.go')
-rw-r--r-- | pkg/sentry/pgalloc/pgalloc.go | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/pkg/sentry/pgalloc/pgalloc.go b/pkg/sentry/pgalloc/pgalloc.go index c8d9facc2..46f19d218 100644 --- a/pkg/sentry/pgalloc/pgalloc.go +++ b/pkg/sentry/pgalloc/pgalloc.go @@ -393,16 +393,17 @@ func (f *MemoryFile) Allocate(length uint64, kind usage.MemoryKind) (platform.Fi return platform.FileRange{}, syserror.ENOMEM } - // Expand the file if needed. Note that findAvailableRange will - // appropriately double the fileSize when required. + // Expand the file if needed. if int64(fr.End) > f.fileSize { - if err := f.file.Truncate(int64(fr.End)); err != nil { + // Round the new file size up to be chunk-aligned. + newFileSize := (int64(fr.End) + chunkMask) &^ chunkMask + if err := f.file.Truncate(newFileSize); err != nil { return platform.FileRange{}, err } - f.fileSize = int64(fr.End) + f.fileSize = newFileSize f.mappingsMu.Lock() oldMappings := f.mappings.Load().([]uintptr) - newMappings := make([]uintptr, f.fileSize>>chunkShift) + newMappings := make([]uintptr, newFileSize>>chunkShift) copy(newMappings, oldMappings) f.mappings.Store(newMappings) f.mappingsMu.Unlock() |