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From a5804fcf7b22fc7d1f9ec794dd284c7d504bd16b Mon Sep 17 00:00:00 2001
From: Omar Sandoval <osandov@fb.com>
Date: Thu, 14 May 2020 08:06:43 +0200
Subject: [PATCH] 9pfs: local: ignore O_NOATIME if we don't have permissions
QEMU's local 9pfs server passes through O_NOATIME from the client. If
the QEMU process doesn't have permissions to use O_NOATIME (namely, it
does not own the file nor have the CAP_FOWNER capability), the open will
fail. This causes issues when from the client's point of view, it
believes it has permissions to use O_NOATIME (e.g., a process running as
root in the virtual machine). Additionally, overlayfs on Linux opens
files on the lower layer using O_NOATIME, so in this case a 9pfs mount
can't be used as a lower layer for overlayfs (cf.
https://github.com/osandov/drgn/blob/dabfe1971951701da13863dbe6d8a1d172ad9650/vmtest/onoatimehack.c
and https://github.com/NixOS/nixpkgs/issues/54509).
Luckily, O_NOATIME is effectively a hint, and is often ignored by, e.g.,
network filesystems. open(2) notes that O_NOATIME "may not be effective
on all filesystems. One example is NFS, where the server maintains the
access time." This means that we can honor it when possible but fall
back to ignoring it.
Acked-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Message-Id: <e9bee604e8df528584693a4ec474ded6295ce8ad.1587149256.git.osandov@fb.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
Upstream-Status: Backport [https://gitlab.com/qemu-project/qemu/-/commit/a5804fcf7b22fc7d1f9ec794dd284c7d504bd16b]
Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
---
hw/9pfs/9p-util.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/hw/9pfs/9p-util.h b/hw/9pfs/9p-util.h
index 79ed6b233e5..546f46dc7dc 100644
--- a/hw/9pfs/9p-util.h
+++ b/hw/9pfs/9p-util.h
@@ -37,9 +37,22 @@ static inline int openat_file(int dirfd, const char *name, int flags,
{
int fd, serrno, ret;
+again:
fd = openat(dirfd, name, flags | O_NOFOLLOW | O_NOCTTY | O_NONBLOCK,
mode);
if (fd == -1) {
+ if (errno == EPERM && (flags & O_NOATIME)) {
+ /*
+ * The client passed O_NOATIME but we lack permissions to honor it.
+ * Rather than failing the open, fall back without O_NOATIME. This
+ * doesn't break the semantics on the client side, as the Linux
+ * open(2) man page notes that O_NOATIME "may not be effective on
+ * all filesystems". In particular, NFS and other network
+ * filesystems ignore it entirely.
+ */
+ flags &= ~O_NOATIME;
+ goto again;
+ }
return -1;
}
--
GitLab
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