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Groups > linux.kernel > #1448698

[PATCH 1/7] nfsd: Make creates return EEXIST instead of EACCES

From "J. Bruce Fields" <bfields@redhat.com>
Newsgroups linux.kernel
Subject [PATCH 1/7] nfsd: Make creates return EEXIST instead of EACCES
Date 2016-07-22 20:00 +0200
Message-ID <rXMTU-xT-23@gated-at.bofh.it> (permalink)
References <rXMKd-r1-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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From: Oleg Drokin <green@linuxhacker.ru>

When doing a create (mkdir/mknod) on a name, it's worth
checking the name exists first before returning EACCES in case
the directory is not writeable by the user.
This makes return values on the client more consistent
regardless of whenever the entry there is cached in the local
cache or not.
Another positive side effect is certain programs only expect
EEXIST in that case even despite POSIX allowing any valid
error to be returned.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---
 fs/nfsd/nfs4proc.c |  6 +++++-
 fs/nfsd/vfs.c      | 11 ++++++++++-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index e0c15f879d89..9d7e1edf0cca 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -605,8 +605,12 @@ nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 
 	fh_init(&resfh, NFS4_FHSIZE);
 
+	/*
+	 * We just check that parent is accessible here, nfsd_* do their
+	 * own access permission checks
+	 */
 	status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
-			   NFSD_MAY_CREATE);
+			   NFSD_MAY_EXEC);
 	if (status)
 		return status;
 
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 6fbd81ecb410..fda4f86161f8 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1161,7 +1161,11 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
 	if (isdotent(fname, flen))
 		goto out;
 
-	err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE);
+	/*
+	 * Even though it is a create, first let's see if we are even allowed
+	 * to peek inside the parent
+	 */
+	err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC);
 	if (err)
 		goto out;
 
@@ -1211,6 +1215,11 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
 		goto out; 
 	}
 
+	/* Now let's see if we actually have permissions to create */
+	err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE);
+	if (err)
+		goto out;
+
 	if (!(iap->ia_valid & ATTR_MODE))
 		iap->ia_mode = 0;
 	iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type;
-- 
2.7.4

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Thread

Re: [PATCH] nfsd: Make creates return EEXIST correctly instead of EPERM Oleg Drokin <green@linuxhacker.ru> - 2016-07-21 22:40 +0200
  Re: [PATCH] nfsd: Make creates return EEXIST correctly instead of  EPERM "J. Bruce Fields" <bfields@fieldses.org> - 2016-07-22 04:00 +0200
    Re: [PATCH] nfsd: Make creates return EEXIST correctly instead of EPERM Oleg Drokin <green@linuxhacker.ru> - 2016-07-22 08:40 +0200
      Re: [PATCH] nfsd: Make creates return EEXIST correctly instead of  EPERM "J. Bruce Fields" <bfields@fieldses.org> - 2016-07-22 13:00 +0200
        Re: [PATCH] nfsd: Make creates return EEXIST correctly instead of EPERM Oleg Drokin <green@linuxhacker.ru> - 2016-07-22 17:20 +0200
          Re: [PATCH] nfsd: Make creates return EEXIST correctly instead of EPERM "J. Bruce Fields" <bfields@redhat.com> - 2016-07-22 20:00 +0200
            [PATCH 6/7] nfsd: clean up bad-type check in nfsd_create_locked "J. Bruce Fields" <bfields@redhat.com> - 2016-07-22 20:00 +0200
            [PATCH 1/7] nfsd: Make creates return EEXIST instead of EACCES "J. Bruce Fields" <bfields@redhat.com> - 2016-07-22 20:00 +0200
            [PATCH 7/7] nfsd: drop unnecessary MAY_EXEC check from create "J. Bruce Fields" <bfields@redhat.com> - 2016-07-22 20:00 +0200

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