------- Comment From [email protected] 2024-12-09 10:26 EDT-------
A fix was posted by the maintainer on qemu-devel
diff --git a/hw/9pfs/9p-util.h b/hw/9pfs/9p-util.h
index 51c94b0116..95ee4da9bd 100644
--- a/hw/9pfs/9p-util.h
+++ b/hw/9pfs/9p-util.h
@@ -177,20 +177,27 @@ again:
return -1;
}
- if (close_if_special_file(fd) < 0) {
- return -1;
- }
-
- serrno = errno;
- /* O_NONBLOCK was only needed to open the file. Let's drop it. We don't
- * do that with O_PATH since fcntl(F_SETFL) isn't supported, and openat()
- * ignored it anyway.
- */
+ /* Only if O_PATH is not set ... */
if (!(flags & O_PATH_9P_UTIL)) {
+ /*
+ * Prevent I/O on special files (device files, etc.) on host side,
+ * however it is safe and required to allow opening them with O_PATH,
+ * as this is limited to (required) path based operations only.
+ */
+ if (close_if_special_file(fd) < 0) {
+ return -1;
+ }
+
+ serrno = errno;
+ /*
+ * O_NONBLOCK was only needed to open the file. Let's drop it. We don't
+ * do that with O_PATH since fcntl(F_SETFL) isn't supported, and
+ * openat() ignored it anyway.
+ */
ret = fcntl(fd, F_SETFL, flags);
assert(!ret);
+ errno = serrno;
}
- errno = serrno;
return fd;
}
--
2.39.5
this fixes the issue for me.
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https://bugs.launchpad.net/bugs/2091099
Title:
[UBUNTU 24.04] OS guest boot issues on 9p filesystem
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