From: Ronnie Sahlberg <lsahlber@redhat.com>
To: linux-cifs <linux-cifs@vger.kernel.org>
Cc: Steve French <smfrench@gmail.com>
Subject: [PATCH] cifs: revalidate mapping when we open files for SMB1 POSIX
Date: Thu, 25 Mar 2021 16:26:35 +1000 [thread overview]
Message-ID: <20210325062635.43370-1-lsahlber@redhat.com> (raw)
RHBZ: 1933527
Under SMB1 + POSIX, if an inode is reused on a server after we have read and
cached a part of a file, when we then open the new file with the
re-cycled inode there is a chance that we may serve the old data out of cache
to the application.
This only happens for SMB1 (deprecated) and when posix are used.
The simplest solution to avoid this race is to force a revalidate
on smb1-posix open.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
---
fs/cifs/file.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 26de4329d161..042e24aad410 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -165,6 +165,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
goto posix_open_ret;
}
} else {
+ cifs_revalidate_mapping(*pinode);
cifs_fattr_to_inode(*pinode, &fattr);
}
--
2.29.2
next reply other threads:[~2021-03-25 6:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 6:26 Ronnie Sahlberg [this message]
2021-03-25 15:34 ` [PATCH] cifs: revalidate mapping when we open files for SMB1 POSIX Paulo Alcantara
2021-03-25 15:42 ` Steve French
-- strict thread matches above, loose matches on Subject: below --
2021-03-25 6:14 Ronnie Sahlberg
2021-03-25 5:23 Ronnie Sahlberg
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