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-rw-r--r--pkg/sentry/mm/syscalls.go10
1 files changed, 10 insertions, 0 deletions
diff --git a/pkg/sentry/mm/syscalls.go b/pkg/sentry/mm/syscalls.go
index 0368c6794..af1e53f5d 100644
--- a/pkg/sentry/mm/syscalls.go
+++ b/pkg/sentry/mm/syscalls.go
@@ -470,6 +470,16 @@ func (mm *MemoryManager) MRemap(ctx context.Context, oldAddr usermem.Addr, oldSi
return 0, syserror.EINVAL
}
+ // Check that the new region is valid.
+ _, err := mm.findAvailableLocked(newSize, findAvailableOpts{
+ Addr: newAddr,
+ Fixed: true,
+ Unmap: true,
+ })
+ if err != nil {
+ return 0, err
+ }
+
// Unmap any mappings at the destination.
mm.unmapLocked(ctx, newAR)