From 9801d8a39cfe6c34f39f9552a246a6bd002e735e Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Tue, 17 Oct 2006 00:10:14 -0700 Subject: [PATCH] [PATCH] knfsd: nfsd4: fix open permission checking We weren't actually checking for SHARE_ACCESS_WRITE, with the result that the owner could open a non-writeable file for write! Continue to allow DENY_WRITE only with write access. Thanks to Jim Rees for reporting the bug. Signed-off-by: J. Bruce Fields Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/nfsd/nfs4proc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index a05d3376cc46..d1fac6872c44 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -78,8 +78,10 @@ do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfs if (open->op_share_access & NFS4_SHARE_ACCESS_READ) accmode |= MAY_READ; - if (open->op_share_deny & NFS4_SHARE_ACCESS_WRITE) + if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) accmode |= (MAY_WRITE | MAY_TRUNC); + if (open->op_share_deny & NFS4_SHARE_DENY_WRITE) + accmode |= MAY_WRITE; status = fh_verify(rqstp, current_fh, S_IFREG, accmode); -- 2.20.1