Fix EOF handling for splice.

Also, add corresponding EOF tests for splice/sendfile.

Discovered by syzkaller.

PiperOrigin-RevId: 328975990

1 files changed, 6 insertions, 1 deletions

diff --git a/pkg/sentry/syscalls/linux/vfs2/splice.go b/pkg/sentry/syscalls/linux/vfs2/splice.go
index 192411393..68ce94778 100644
--- a/pkg/sentry/syscalls/linux/vfs2/splice.go
+++ b/pkg/sentry/syscalls/linux/vfs2/splice.go
@@ -141,9 +141,14 @@ func Splice(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Syscal
 				inOffset += n
 			}
 		default:
-			panic("not possible")
+			panic("at least one end of splice must be a pipe")
 		}
 
+		if n == 0 && err == io.EOF {
+			// We reached the end of the file. Eat the error and exit the loop.
+			err = nil
+			break
+		}
 		if n != 0 || err != syserror.ErrWouldBlock || nonBlock {
 			break
 		}