linux-kernel - [PATCH AUTOSEL 6.5 22/52] nfs42: client needs to strip file mode's suid/sgid bit after ALLOCATE op

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Message-ID: <20231029225441.789781-22-sashal@kernel.org>
Date:   Sun, 29 Oct 2023 18:53:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dai Ngo <dai.ngo@...cle.com>,
        Trond Myklebust <trondmy@...merspace.com>,
        Jeff Layton <jlayton@...nel.org>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        Sasha Levin <sashal@...nel.org>,
        trond.myklebust@...merspace.com, anna@...nel.org,
        linux-nfs@...r.kernel.org
Subject: [PATCH AUTOSEL 6.5 22/52] nfs42: client needs to strip file mode's suid/sgid bit after ALLOCATE op

From: Dai Ngo <dai.ngo@...cle.com>

[ Upstream commit f588d72bd95f748849685412b1f0c7959ca228cf ]

The Linux NFS server strips the SUID and SGID from the file mode
on ALLOCATE op.

Modify _nfs42_proc_fallocate to add NFS_INO_REVAL_FORCED to
nfs_set_cache_invalid's argument to force update of the file
mode suid/sgid bit.

Suggested-by: Trond Myklebust <trondmy@...merspace.com>
Signed-off-by: Dai Ngo <dai.ngo@...cle.com>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
Tested-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfs/nfs42proc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 063e00aff87ed..28704f924612c 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -81,7 +81,8 @@ static int _nfs42_proc_fallocate(struct rpc_message *msg, struct file *filep,
 	if (status == 0) {
 		if (nfs_should_remove_suid(inode)) {
 			spin_lock(&inode->i_lock);
-			nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
+			nfs_set_cache_invalid(inode,
+				NFS_INO_REVAL_FORCED | NFS_INO_INVALID_MODE);
 			spin_unlock(&inode->i_lock);
 		}
 		status = nfs_post_op_update_inode_force_wcc(inode,
-- 
2.42.0