From 8505c8bfd85a260c9dc5c47e15bd8c5357fcbcd2 Mon Sep 17 00:00:00 2001 From: Steve French Date: Mon, 18 Jun 2018 14:01:59 -0500 Subject: [PATCH] smb3: if server does not support posix do not allow posix mount option If user specifies "posix" on an SMB3.11 mount, then fail the mount if server does not return the POSIX negotiate context indicating support for posix. Signed-off-by: Steve French Reviewed-by: Aurelien Aptel --- fs/cifs/connect.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 5df2c06..9d02563 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -3031,11 +3031,15 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info) } #ifdef CONFIG_CIFS_SMB311 - if ((volume_info->linux_ext) && (ses->server->posix_ext_supported)) { - if (ses->server->vals->protocol_id == SMB311_PROT_ID) { + if (volume_info->linux_ext) { + if (ses->server->posix_ext_supported) { tcon->posix_extensions = true; printk_once(KERN_WARNING "SMB3.11 POSIX Extensions are experimental\n"); + } else { + cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions.\n"); + rc = -EOPNOTSUPP; + goto out_fail; } } #endif /* 311 */ -- 2.7.4