executor: ignore EBADF when reading tun

Fuzzer managed to do:

executing program 0:
...
close_range(r5, 0xffffffffffffffff, 0x0)
...
SYZFATAL: executor 0 failed 11 times: executor 0: exit status 67
SYZFAIL: tun read failed
 (errno 9: Bad file descriptor)

2 files changed, 3 insertions, 2 deletions

diff --git a/executor/common_linux.h b/executor/common_linux.h
index f53a0e781..93ecef654 100644
--- a/executor/common_linux.h
+++ b/executor/common_linux.h
@@ -1749,8 +1749,9 @@ static int read_tun(char* data, int size)
 
 	int rv = read(tunfd, data, size);
 	if (rv < 0) {
+		// EBADF can be returned if the test closes tunfd with close_range syscall.
 		// Tun sometimes returns EBADFD, unclear if it's a kernel bug or not.
-		if (errno == EAGAIN || errno == EBADFD)
+		if (errno == EAGAIN || errno == EBADF || errno == EBADFD)
 			return -1;
 		fail("tun read failed");
 	}
diff --git a/pkg/csource/generated.go b/pkg/csource/generated.go
index 6f5cf9095..c983873c8 100644
--- a/pkg/csource/generated.go
+++ b/pkg/csource/generated.go
@@ -4258,7 +4258,7 @@ static int read_tun(char* data, int size)
 
 	int rv = read(tunfd, data, size);
 	if (rv < 0) {
-		if (errno == EAGAIN || errno == EBADFD)
+		if (errno == EAGAIN || errno == EBADF || errno == EBADFD)
 			return -1;
 		fail("tun read failed");
 	}