gvisor: interrupt the sendfile system call if a task has been interrupted

sendfile can be called for a big range and it can require significant
amount of time to process it, so we need to handle task interrupts in
this system call.

PiperOrigin-RevId: 249781023
Change-Id: Ifc2ec505d74c06f5ee76f93b8d30d518ec2d4015

1 files changed, 6 insertions, 0 deletions

diff --git a/pkg/sentry/fs/file.go b/pkg/sentry/fs/file.go
index 8f1baca23..8c1307235 100644
--- a/pkg/sentry/fs/file.go
+++ b/pkg/sentry/fs/file.go
@@ -516,12 +516,18 @@ type lockedReader struct {
 
 // Read implements io.Reader.Read.
 func (r *lockedReader) Read(buf []byte) (int, error) {
+	if r.Ctx.Interrupted() {
+		return 0, syserror.ErrInterrupted
+	}
 	n, err := r.File.FileOperations.Read(r.Ctx, r.File, usermem.BytesIOSequence(buf), r.File.offset)
 	return int(n), err
 }
 
 // ReadAt implements io.Reader.ReadAt.
 func (r *lockedReader) ReadAt(buf []byte, offset int64) (int, error) {
+	if r.Ctx.Interrupted() {
+		return 0, syserror.ErrInterrupted
+	}
 	n, err := r.File.FileOperations.Read(r.Ctx, r.File, usermem.BytesIOSequence(buf), offset)
 	return int(n), err
 }