From: Sasha Levin <sashal@kernel.org>
To: stable@vger.kernel.org
Cc: Chuck Lever <cel@kernel.org>, Jeff Layton <jlayton@kernel.org>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.18.y 2/3] NFSD: Move version-specific ACCESS maps into per-version code
Date: Thu, 5 Nov 2026 21:29:13 -0500 [thread overview]
Message-ID: <20261106022850.3722633-2-sashal@kernel.org> (raw)
In-Reply-To: <20261106022850.3722633-1-sashal@kernel.org>
From: Chuck Lever <cel@kernel.org>
[ Upstream commit 3423b5f91d80d3a76424e1c9f1d0f95d4dd80101 ]
nfsd_access() owns three static tables that map on-the-wire ACCESS
bits to NFSD_MAY flags, and every NFS version shares them. That puts
protocol-version specifics in the version-agnostic VFS layer. The
NFSv4.2 extended-attribute bits are wedged into the NFSv3 tables
under CONFIG_NFSD_V4.
Give each version its own tables in its proc code and pass the
matching set into nfsd_access() as a new argument.
Splitting the tables also stops the NFSv2-ACL and NFSv3 ACCESS paths
from answering for the NFSv4.2 extended-attribute bits. Both use the
NFSv4-augmented table whenever CONFIG_NFSD_V4 is set, so an NFSv3
request that sets an xattr bit has it echoed back in the reply even
though those bits are undefined for v3.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260810141900.33846-2-cel@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>
Stable-dep-of: ccfc4db5ab74 ("NFSD: map fh_verify() status codes for NFS_ACLv2 replies")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/nfsd/nfs2acl.c | 46 ++++++++++++++++++++++++++-
fs/nfsd/nfs3proc.c | 41 +++++++++++++++++++++++-
fs/nfsd/nfs4proc.c | 42 +++++++++++++++++++++++--
fs/nfsd/vfs.c | 78 ++++++++++------------------------------------
fs/nfsd/vfs.h | 15 ++++++++-
5 files changed, 155 insertions(+), 67 deletions(-)
diff --git a/fs/nfsd/nfs2acl.c b/fs/nfsd/nfs2acl.c
index 2998640f259de..537097ce8c767 100644
--- a/fs/nfsd/nfs2acl.c
+++ b/fs/nfsd/nfs2acl.c
@@ -15,6 +15,48 @@
#define NFSDDBG_FACILITY NFSDDBG_PROC
+/*
+ * These maps are identical to the NFSv3 maps (nfs3proc.c). This enables
+ * the behavior of the two versions to diverge if needed.
+ */
+static const struct nfsd_access_map nfsd2_regaccess[] = {
+ { NFS3_ACCESS_READ, NFSD_MAY_READ },
+ { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
+ { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
+ { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE },
+ { 0, 0 }
+};
+
+static const struct nfsd_access_map nfsd2_diraccess[] = {
+ { NFS3_ACCESS_READ, NFSD_MAY_READ },
+ { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC },
+ { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
+ { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE },
+ { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE },
+ { 0, 0 }
+};
+
+/*
+ * Some clients - Solaris 2.6 at least, make an access call to the NFS
+ * server to check for access for things like /dev/null (which really,
+ * NFSD doesn't care about). So NFSD provides simple access checking
+ * for those objects, looking mainly at mode bits, ignoring read-only
+ * filesystem checks.
+ */
+static const struct nfsd_access_map nfsd2_otheraccess[] = {
+ { NFS3_ACCESS_READ, NFSD_MAY_READ },
+ { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
+ { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
+ { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
+ { 0, 0 }
+};
+
+static const struct nfsd_access_maps nfsd2_access_maps = {
+ .regular = nfsd2_regaccess,
+ .directory = nfsd2_diraccess,
+ .other = nfsd2_otheraccess,
+};
+
/*
* NULL call.
*/
@@ -180,7 +222,9 @@ static __be32 nfsacld_proc_access(struct svc_rqst *rqstp)
fh_copy(&resp->fh, &argp->fh);
resp->access = argp->access;
- resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
+
+ resp->status = nfsd_access(rqstp, &resp->fh, &nfsd2_access_maps,
+ &resp->access, NULL);
if (resp->status != nfs_ok)
goto out;
resp->status = fh_getattr(&resp->fh, &resp->stat);
diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index b71c869aaea7c..87c5e766133c8 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -48,6 +48,44 @@ static bool nfsd3_time_in_range(const struct iattr *iap)
return true;
}
+static const struct nfsd_access_map nfsd3_regaccess[] = {
+ { NFS3_ACCESS_READ, NFSD_MAY_READ },
+ { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
+ { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
+ { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE },
+ { 0, 0 }
+};
+
+static const struct nfsd_access_map nfsd3_diraccess[] = {
+ { NFS3_ACCESS_READ, NFSD_MAY_READ },
+ { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC },
+ { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
+ { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE },
+ { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE },
+ { 0, 0 }
+};
+
+/*
+ * Some clients - Solaris 2.6 at least, make an access call to the NFS
+ * server to check for access for things like /dev/null (which really,
+ * NFSD doesn't care about). So NFSD provides simple access checking
+ * for those objects, looking mainly at mode bits, ignoring read-only
+ * filesystem checks.
+ */
+static const struct nfsd_access_map nfsd3_otheraccess[] = {
+ { NFS3_ACCESS_READ, NFSD_MAY_READ },
+ { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
+ { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
+ { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
+ { 0, 0 }
+};
+
+static const struct nfsd_access_maps nfsd3_access_maps = {
+ .regular = nfsd3_regaccess,
+ .directory = nfsd3_diraccess,
+ .other = nfsd3_otheraccess,
+};
+
static int nfsd3_iocb_flags(enum nfs3_stable_how how)
{
switch (how) {
@@ -185,7 +223,8 @@ nfsd3_proc_access(struct svc_rqst *rqstp)
fh_copy(&resp->fh, &argp->fh);
resp->access = argp->access;
- resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
+ resp->status = nfsd_access(rqstp, &resp->fh, &nfsd3_access_maps,
+ &resp->access, NULL);
resp->status = nfsd3_map_status(resp->status);
return rpc_success;
}
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 161208b972be2..6c33eebd1a144 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -68,6 +68,43 @@ MODULE_PARM_DESC(nfsd4_ssc_umount_timeout,
#define NFSDDBG_FACILITY NFSDDBG_PROC
+static const struct nfsd_access_map nfsd4_regaccess[] = {
+ { NFS4_ACCESS_READ, NFSD_MAY_READ },
+ { NFS4_ACCESS_EXECUTE, NFSD_MAY_EXEC },
+ { NFS4_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
+ { NFS4_ACCESS_EXTEND, NFSD_MAY_WRITE },
+ { NFS4_ACCESS_XAREAD, NFSD_MAY_READ },
+ { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE },
+ { NFS4_ACCESS_XALIST, NFSD_MAY_READ },
+ { 0, 0 }
+};
+
+static const struct nfsd_access_map nfsd4_diraccess[] = {
+ { NFS4_ACCESS_READ, NFSD_MAY_READ },
+ { NFS4_ACCESS_LOOKUP, NFSD_MAY_EXEC },
+ { NFS4_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
+ { NFS4_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE },
+ { NFS4_ACCESS_DELETE, NFSD_MAY_REMOVE },
+ { NFS4_ACCESS_XAREAD, NFSD_MAY_READ },
+ { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE },
+ { NFS4_ACCESS_XALIST, NFSD_MAY_READ },
+ { 0, 0 }
+};
+
+static const struct nfsd_access_map nfsd4_otheraccess[] = {
+ { NFS4_ACCESS_READ, NFSD_MAY_READ },
+ { NFS4_ACCESS_EXECUTE, NFSD_MAY_EXEC },
+ { NFS4_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
+ { NFS4_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
+ { 0, 0 }
+};
+
+static const struct nfsd_access_maps nfsd4_access_maps = {
+ .regular = nfsd4_regaccess,
+ .directory = nfsd4_diraccess,
+ .other = nfsd4_otheraccess,
+};
+
static int nfsd4_iocb_flags(enum stable_how4 how)
{
switch (how) {
@@ -764,10 +801,9 @@ nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
if (access->ac_req_access & ~access_full)
return nfserr_inval;
-
access->ac_resp_access = access->ac_req_access;
- return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
- &access->ac_supported);
+ return nfsd_access(rqstp, &cstate->current_fh, &nfsd4_access_maps,
+ &access->ac_resp_access, &access->ac_supported);
}
static __be32
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index a126da5c3e8e3..7094902ca93a8 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -753,64 +753,21 @@ __be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp,
}
#endif /* defined(CONFIG_NFSD_V4) */
-/*
- * Check server access rights to a file system object
+/**
+ * nfsd_access - Check caller's access rights to a file system object
+ * @rqstp: RPC transaction context
+ * @fhp: target NFS filehandle
+ * @maps: tables mapping on-the-wire access bits to NFSD_MAY flags
+ * @access: requested access bits on entry, permitted bits on return
+ * @supported: optional output of the access bits the server supports
+ *
+ * Return: nfs_ok on success, otherwise an nfserr status code
*/
-struct accessmap {
- u32 access;
- int how;
-};
-static struct accessmap nfs3_regaccess[] = {
- { NFS3_ACCESS_READ, NFSD_MAY_READ },
- { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
- { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC },
- { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE },
-
-#ifdef CONFIG_NFSD_V4
- { NFS4_ACCESS_XAREAD, NFSD_MAY_READ },
- { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE },
- { NFS4_ACCESS_XALIST, NFSD_MAY_READ },
-#endif
-
- { 0, 0 }
-};
-
-static struct accessmap nfs3_diraccess[] = {
- { NFS3_ACCESS_READ, NFSD_MAY_READ },
- { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC },
- { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC},
- { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE },
- { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE },
-
-#ifdef CONFIG_NFSD_V4
- { NFS4_ACCESS_XAREAD, NFSD_MAY_READ },
- { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE },
- { NFS4_ACCESS_XALIST, NFSD_MAY_READ },
-#endif
-
- { 0, 0 }
-};
-
-static struct accessmap nfs3_anyaccess[] = {
- /* Some clients - Solaris 2.6 at least, make an access call
- * to the server to check for access for things like /dev/null
- * (which really, the server doesn't care about). So
- * We provide simple access checking for them, looking
- * mainly at mode bits, and we make sure to ignore read-only
- * filesystem checks
- */
- { NFS3_ACCESS_READ, NFSD_MAY_READ },
- { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC },
- { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
- { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS },
-
- { 0, 0 }
-};
-
-__be32
-nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported)
+__be32 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ const struct nfsd_access_maps *maps,
+ u32 *access, u32 *supported)
{
- struct accessmap *map;
+ const struct nfsd_access_map *map;
struct svc_export *export;
struct dentry *dentry;
u32 query, result = 0, sresult = 0;
@@ -824,12 +781,11 @@ nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *suppor
dentry = fhp->fh_dentry;
if (d_is_reg(dentry))
- map = nfs3_regaccess;
+ map = maps->regular;
else if (d_is_dir(dentry))
- map = nfs3_diraccess;
+ map = maps->directory;
else
- map = nfs3_anyaccess;
-
+ map = maps->other;
query = *access;
for (; map->access; map++) {
@@ -839,7 +795,7 @@ nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *suppor
sresult |= map->access;
err2 = nfsd_permission(&rqstp->rq_cred, export,
- dentry, map->how);
+ dentry, map->may);
switch (err2) {
case nfs_ok:
result |= map->access;
diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index 2f589c4f0248c..7f6b90b6272d1 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -38,6 +38,17 @@
#define NFSD_MAY_CREATE (NFSD_MAY_EXEC|NFSD_MAY_WRITE)
#define NFSD_MAY_REMOVE (NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC)
+struct nfsd_access_map {
+ u32 access;
+ int may;
+};
+
+struct nfsd_access_maps {
+ const struct nfsd_access_map *regular;
+ const struct nfsd_access_map *directory;
+ const struct nfsd_access_map *other;
+};
+
struct nfsd_file;
/*
@@ -96,7 +107,9 @@ __be32 nfsd_create_locked(struct svc_rqst *, struct svc_fh *,
__be32 nfsd_create(struct svc_rqst *, struct svc_fh *,
char *name, int len, struct nfsd_attrs *attrs,
int type, dev_t rdev, struct svc_fh *res);
-__be32 nfsd_access(struct svc_rqst *, struct svc_fh *, u32 *, u32 *);
+__be32 nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ const struct nfsd_access_maps *maps,
+ u32 *access, u32 *supported);
__be32 nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
struct svc_fh *resfhp, struct nfsd_attrs *iap);
__be32 nfsd_commit(struct svc_rqst *rqst, struct svc_fh *fhp,
--
2.53.0
next prev parent reply other threads:[~2026-11-06 2:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-04 18:54 FAILED: patch "[PATCH] NFSD: map fh_verify() status codes for NFS_ACLv2 replies" failed to apply to 6.18-stable tree gregkh
2026-11-06 2:29 ` [PATCH 6.18.y 1/3] NFSD: Replace nfsd_write()'s "stable" argument with "iocb_flags" Sasha Levin
2026-11-06 2:29 ` Sasha Levin [this message]
2026-11-06 2:29 ` [PATCH 6.18.y 3/3] NFSD: map fh_verify() status codes for NFS_ACLv2 replies Sasha Levin
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