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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-23 16:00:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-23 16:00:10 -0700
commit9157141c95bc3ffcdae93fde5d5aafee7ce6e39a (patch)
treed19dd16a9caeec931fabfb31213aac9dda68af6d /net
parent6f7948f566bf423ddf5ff58dc0198afcf37c0b64 (diff)
parent108b833cde9c9b93204e6a4e455829a67f9785c3 (diff)
downloadlinux-9157141c95bc3ffcdae93fde5d5aafee7ce6e39a.tar.bz2
Merge tag 'nfsd-4.19-1' of git://linux-nfs.org/~bfields/linux
Pull nfsd updates from Bruce Fields: "Chuck Lever fixed a problem with NFSv4.0 callbacks over GSS from multi-homed servers. The only new feature is a minor bit of protocol (change_attr_type) which the client doesn't even use yet. Other than that, various bugfixes and cleanup" * tag 'nfsd-4.19-1' of git://linux-nfs.org/~bfields/linux: (27 commits) sunrpc: Add comment defining gssd upcall API keywords nfsd: Remove callback_cred nfsd: Use correct credential for NFSv4.0 callback with GSS sunrpc: Extract target name into svc_cred sunrpc: Enable the kernel to specify the hostname part of service principals sunrpc: Don't use stack buffer with scatterlist rpc: remove unneeded variable 'ret' in rdma_listen_handler nfsd: use true and false for boolean values nfsd: constify write_op[] fs/nfsd: Delete invalid assignment statements in nfsd4_decode_exchange_id NFSD: Handle full-length symlinks NFSD: Refactor the generic write vector fill helper svcrdma: Clean up Read chunk path svcrdma: Avoid releasing a page in svc_xprt_release() nfsd: Mark expected switch fall-through sunrpc: remove redundant variables 'checksumlen','blocksize' and 'data' nfsd: fix leaked file lock with nfs exported overlayfs nfsd: don't advertise a SCSI layout for an unsupported request_queue nfsd: fix corrupted reply to badly ordered compound nfsd: clarify check_op_ordering ...
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/auth_gss/auth_gss.c37
-rw-r--r--net/sunrpc/auth_gss/gss_krb5_crypto.c14
-rw-r--r--net/sunrpc/auth_gss/gss_krb5_wrap.c2
-rw-r--r--net/sunrpc/auth_gss/gss_rpc_upcall.c70
-rw-r--r--net/sunrpc/svc.c78
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma.c2
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_recvfrom.c9
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_rw.c32
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_sendto.c4
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_transport.c3
10 files changed, 140 insertions, 111 deletions
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 0fc397fae42b..962afb8912d5 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -284,7 +284,12 @@ err:
return p;
}
-#define UPCALL_BUF_LEN 128
+/* XXX: Need some documentation about why UPCALL_BUF_LEN is so small.
+ * Is user space expecting no more than UPCALL_BUF_LEN bytes?
+ * Note that there are now _two_ NI_MAXHOST sized data items
+ * being passed in this string.
+ */
+#define UPCALL_BUF_LEN 256
struct gss_upcall_msg {
refcount_t count;
@@ -456,18 +461,44 @@ static int gss_encode_v1_msg(struct gss_upcall_msg *gss_msg,
buflen -= len;
p += len;
gss_msg->msg.len = len;
+
+ /*
+ * target= is a full service principal that names the remote
+ * identity that we are authenticating to.
+ */
if (target_name) {
len = scnprintf(p, buflen, "target=%s ", target_name);
buflen -= len;
p += len;
gss_msg->msg.len += len;
}
- if (service_name != NULL) {
- len = scnprintf(p, buflen, "service=%s ", service_name);
+
+ /*
+ * gssd uses service= and srchost= to select a matching key from
+ * the system's keytab to use as the source principal.
+ *
+ * service= is the service name part of the source principal,
+ * or "*" (meaning choose any).
+ *
+ * srchost= is the hostname part of the source principal. When
+ * not provided, gssd uses the local hostname.
+ */
+ if (service_name) {
+ char *c = strchr(service_name, '@');
+
+ if (!c)
+ len = scnprintf(p, buflen, "service=%s ",
+ service_name);
+ else
+ len = scnprintf(p, buflen,
+ "service=%.*s srchost=%s ",
+ (int)(c - service_name),
+ service_name, c + 1);
buflen -= len;
p += len;
gss_msg->msg.len += len;
}
+
if (mech->gm_upcall_enctypes) {
len = scnprintf(p, buflen, "enctypes=%s ",
mech->gm_upcall_enctypes);
diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c
index 8654494b4d0a..d31f868b643c 100644
--- a/net/sunrpc/auth_gss/gss_krb5_crypto.c
+++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c
@@ -169,7 +169,7 @@ make_checksum_hmac_md5(struct krb5_ctx *kctx, char *header, int hdrlen,
struct scatterlist sg[1];
int err = -1;
u8 *checksumdata;
- u8 rc4salt[4];
+ u8 *rc4salt;
struct crypto_ahash *md5;
struct crypto_ahash *hmac_md5;
struct ahash_request *req;
@@ -183,14 +183,18 @@ make_checksum_hmac_md5(struct krb5_ctx *kctx, char *header, int hdrlen,
return GSS_S_FAILURE;
}
+ rc4salt = kmalloc_array(4, sizeof(*rc4salt), GFP_NOFS);
+ if (!rc4salt)
+ return GSS_S_FAILURE;
+
if (arcfour_hmac_md5_usage_to_salt(usage, rc4salt)) {
dprintk("%s: invalid usage value %u\n", __func__, usage);
- return GSS_S_FAILURE;
+ goto out_free_rc4salt;
}
checksumdata = kmalloc(GSS_KRB5_MAX_CKSUM_LEN, GFP_NOFS);
if (!checksumdata)
- return GSS_S_FAILURE;
+ goto out_free_rc4salt;
md5 = crypto_alloc_ahash("md5", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(md5))
@@ -258,6 +262,8 @@ out_free_md5:
crypto_free_ahash(md5);
out_free_cksum:
kfree(checksumdata);
+out_free_rc4salt:
+ kfree(rc4salt);
return err ? GSS_S_FAILURE : 0;
}
@@ -373,7 +379,6 @@ make_checksum_v2(struct krb5_ctx *kctx, char *header, int hdrlen,
struct scatterlist sg[1];
int err = -1;
u8 *checksumdata;
- unsigned int checksumlen;
if (kctx->gk5e->keyed_cksum == 0) {
dprintk("%s: expected keyed hash for %s\n",
@@ -393,7 +398,6 @@ make_checksum_v2(struct krb5_ctx *kctx, char *header, int hdrlen,
tfm = crypto_alloc_ahash(kctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm))
goto out_free_cksum;
- checksumlen = crypto_ahash_digestsize(tfm);
req = ahash_request_alloc(tfm, GFP_NOFS);
if (!req)
diff --git a/net/sunrpc/auth_gss/gss_krb5_wrap.c b/net/sunrpc/auth_gss/gss_krb5_wrap.c
index a737c2da0837..9a1347fec6f4 100644
--- a/net/sunrpc/auth_gss/gss_krb5_wrap.c
+++ b/net/sunrpc/auth_gss/gss_krb5_wrap.c
@@ -440,7 +440,6 @@ static u32
gss_wrap_kerberos_v2(struct krb5_ctx *kctx, u32 offset,
struct xdr_buf *buf, struct page **pages)
{
- int blocksize;
u8 *ptr, *plainhdr;
s32 now;
u8 flags = 0x00;
@@ -473,7 +472,6 @@ gss_wrap_kerberos_v2(struct krb5_ctx *kctx, u32 offset,
*ptr++ = 0xff;
be16ptr = (__be16 *)ptr;
- blocksize = crypto_skcipher_blocksize(kctx->acceptor_enc);
*be16ptr++ = 0;
/* "inner" token header always uses 0 for RRC */
*be16ptr++ = 0;
diff --git a/net/sunrpc/auth_gss/gss_rpc_upcall.c b/net/sunrpc/auth_gss/gss_rpc_upcall.c
index 1c7c49dbf8ba..73dcda060335 100644
--- a/net/sunrpc/auth_gss/gss_rpc_upcall.c
+++ b/net/sunrpc/auth_gss/gss_rpc_upcall.c
@@ -234,6 +234,35 @@ static int gssp_alloc_receive_pages(struct gssx_arg_accept_sec_context *arg)
return 0;
}
+static char *gssp_stringify(struct xdr_netobj *netobj)
+{
+ return kstrndup(netobj->data, netobj->len, GFP_KERNEL);
+}
+
+static void gssp_hostbased_service(char **principal)
+{
+ char *c;
+
+ if (!*principal)
+ return;
+
+ /* terminate and remove realm part */
+ c = strchr(*principal, '@');
+ if (c) {
+ *c = '\0';
+
+ /* change service-hostname delimiter */
+ c = strchr(*principal, '/');
+ if (c)
+ *c = '@';
+ }
+ if (!c) {
+ /* not a service principal */
+ kfree(*principal);
+ *principal = NULL;
+ }
+}
+
/*
* Public functions
*/
@@ -262,6 +291,7 @@ int gssp_accept_sec_context_upcall(struct net *net,
*/
.exported_context_token.len = GSSX_max_output_handle_sz,
.mech.len = GSS_OID_MAX_LEN,
+ .targ_name.display_name.len = GSSX_max_princ_sz,
.src_name.display_name.len = GSSX_max_princ_sz
};
struct gssx_res_accept_sec_context res = {
@@ -275,6 +305,7 @@ int gssp_accept_sec_context_upcall(struct net *net,
.rpc_cred = NULL, /* FIXME ? */
};
struct xdr_netobj client_name = { 0 , NULL };
+ struct xdr_netobj target_name = { 0, NULL };
int ret;
if (data->in_handle.len != 0)
@@ -285,8 +316,6 @@ int gssp_accept_sec_context_upcall(struct net *net,
if (ret)
return ret;
- /* use nfs/ for targ_name ? */
-
ret = gssp_call(net, &msg);
gssp_free_receive_pages(&arg);
@@ -304,6 +333,7 @@ int gssp_accept_sec_context_upcall(struct net *net,
kfree(rctxh.mech.data);
}
client_name = rctxh.src_name.display_name;
+ target_name = rctxh.targ_name.display_name;
}
if (res.options.count == 1) {
@@ -325,32 +355,22 @@ int gssp_accept_sec_context_upcall(struct net *net,
}
/* convert to GSS_NT_HOSTBASED_SERVICE form and set into creds */
- if (data->found_creds && client_name.data != NULL) {
- char *c;
-
- data->creds.cr_raw_principal = kstrndup(client_name.data,
- client_name.len, GFP_KERNEL);
-
- data->creds.cr_principal = kstrndup(client_name.data,
- client_name.len, GFP_KERNEL);
- if (data->creds.cr_principal) {
- /* terminate and remove realm part */
- c = strchr(data->creds.cr_principal, '@');
- if (c) {
- *c = '\0';
-
- /* change service-hostname delimiter */
- c = strchr(data->creds.cr_principal, '/');
- if (c) *c = '@';
- }
- if (!c) {
- /* not a service principal */
- kfree(data->creds.cr_principal);
- data->creds.cr_principal = NULL;
- }
+ if (data->found_creds) {
+ if (client_name.data) {
+ data->creds.cr_raw_principal =
+ gssp_stringify(&client_name);
+ data->creds.cr_principal =
+ gssp_stringify(&client_name);
+ gssp_hostbased_service(&data->creds.cr_principal);
+ }
+ if (target_name.data) {
+ data->creds.cr_targ_princ =
+ gssp_stringify(&target_name);
+ gssp_hostbased_service(&data->creds.cr_targ_princ);
}
}
kfree(client_name.data);
+ kfree(target_name.data);
return ret;
}
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 30a4226baf03..d13e05f1a990 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -1537,16 +1537,16 @@ EXPORT_SYMBOL_GPL(svc_max_payload);
/**
* svc_fill_write_vector - Construct data argument for VFS write call
* @rqstp: svc_rqst to operate on
+ * @pages: list of pages containing data payload
* @first: buffer containing first section of write payload
* @total: total number of bytes of write payload
*
- * Returns the number of elements populated in the data argument array.
+ * Fills in rqstp::rq_vec, and returns the number of elements.
*/
-unsigned int svc_fill_write_vector(struct svc_rqst *rqstp, struct kvec *first,
- size_t total)
+unsigned int svc_fill_write_vector(struct svc_rqst *rqstp, struct page **pages,
+ struct kvec *first, size_t total)
{
struct kvec *vec = rqstp->rq_vec;
- struct page **pages;
unsigned int i;
/* Some types of transport can present the write payload
@@ -1560,14 +1560,11 @@ unsigned int svc_fill_write_vector(struct svc_rqst *rqstp, struct kvec *first,
++i;
}
- WARN_ON_ONCE(rqstp->rq_arg.page_base != 0);
- pages = rqstp->rq_arg.pages;
while (total) {
vec[i].iov_base = page_address(*pages);
vec[i].iov_len = min_t(size_t, total, PAGE_SIZE);
total -= vec[i].iov_len;
++i;
-
++pages;
}
@@ -1580,65 +1577,48 @@ EXPORT_SYMBOL_GPL(svc_fill_write_vector);
* svc_fill_symlink_pathname - Construct pathname argument for VFS symlink call
* @rqstp: svc_rqst to operate on
* @first: buffer containing first section of pathname
+ * @p: buffer containing remaining section of pathname
* @total: total length of the pathname argument
*
- * Returns pointer to a NUL-terminated string, or an ERR_PTR. The buffer is
- * released automatically when @rqstp is recycled.
+ * The VFS symlink API demands a NUL-terminated pathname in mapped memory.
+ * Returns pointer to a NUL-terminated string, or an ERR_PTR. Caller must free
+ * the returned string.
*/
char *svc_fill_symlink_pathname(struct svc_rqst *rqstp, struct kvec *first,
- size_t total)
+ void *p, size_t total)
{
- struct xdr_buf *arg = &rqstp->rq_arg;
- struct page **pages;
- char *result;
-
- /* VFS API demands a NUL-terminated pathname. This function
- * uses a page from @rqstp as the pathname buffer, to enable
- * direct placement. Thus the total buffer size is PAGE_SIZE.
- * Space in this buffer for NUL-termination requires that we
- * cap the size of the returned symlink pathname just a
- * little early.
- */
- if (total > PAGE_SIZE - 1)
- return ERR_PTR(-ENAMETOOLONG);
+ size_t len, remaining;
+ char *result, *dst;
- /* Some types of transport can present the pathname entirely
- * in rq_arg.pages. If not, then copy the pathname into one
- * page.
- */
- pages = arg->pages;
- WARN_ON_ONCE(arg->page_base != 0);
- if (first->iov_base == 0) {
- result = page_address(*pages);
- result[total] = '\0';
- } else {
- size_t len, remaining;
- char *dst;
+ result = kmalloc(total + 1, GFP_KERNEL);
+ if (!result)
+ return ERR_PTR(-ESERVERFAULT);
- result = page_address(*(rqstp->rq_next_page++));
- dst = result;
- remaining = total;
+ dst = result;
+ remaining = total;
- len = min_t(size_t, total, first->iov_len);
+ len = min_t(size_t, total, first->iov_len);
+ if (len) {
memcpy(dst, first->iov_base, len);
dst += len;
remaining -= len;
+ }
- /* No more than one page left */
- if (remaining) {
- len = min_t(size_t, remaining, PAGE_SIZE);
- memcpy(dst, page_address(*pages), len);
- dst += len;
- }
-
- *dst = '\0';
+ if (remaining) {
+ len = min_t(size_t, remaining, PAGE_SIZE);
+ memcpy(dst, p, len);
+ dst += len;
}
- /* Sanity check: we don't allow the pathname argument to
+ *dst = '\0';
+
+ /* Sanity check: Linux doesn't allow the pathname argument to
* contain a NUL byte.
*/
- if (strlen(result) != total)
+ if (strlen(result) != total) {
+ kfree(result);
return ERR_PTR(-EINVAL);
+ }
return result;
}
EXPORT_SYMBOL_GPL(svc_fill_symlink_pathname);
diff --git a/net/sunrpc/xprtrdma/svc_rdma.c b/net/sunrpc/xprtrdma/svc_rdma.c
index 357ba90c382d..134bef6a451e 100644
--- a/net/sunrpc/xprtrdma/svc_rdma.c
+++ b/net/sunrpc/xprtrdma/svc_rdma.c
@@ -94,7 +94,6 @@ static int read_reset_stat(struct ctl_table *table, int write,
atomic_set(stat, 0);
else {
char str_buf[32];
- char *data;
int len = snprintf(str_buf, 32, "%d\n", atomic_read(stat));
if (len >= 32)
return -EFAULT;
@@ -103,7 +102,6 @@ static int read_reset_stat(struct ctl_table *table, int write,
*lenp = 0;
return 0;
}
- data = &str_buf[*ppos];
len -= *ppos;
if (len > *lenp)
len = *lenp;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index 2ef75e885411..b24d5b8f2fee 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -365,9 +365,6 @@ static void svc_rdma_build_arg_xdr(struct svc_rqst *rqstp,
arg->page_base = 0;
arg->buflen = ctxt->rc_byte_len;
arg->len = ctxt->rc_byte_len;
-
- rqstp->rq_respages = &rqstp->rq_pages[0];
- rqstp->rq_next_page = rqstp->rq_respages + 1;
}
/* This accommodates the largest possible Write chunk,
@@ -729,6 +726,12 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
svc_rdma_build_arg_xdr(rqstp, ctxt);
+ /* Prevent svc_xprt_release from releasing pages in rq_pages
+ * if we return 0 or an error.
+ */
+ rqstp->rq_respages = rqstp->rq_pages;
+ rqstp->rq_next_page = rqstp->rq_respages;
+
p = (__be32 *)rqstp->rq_arg.head[0].iov_base;
ret = svc_rdma_xdr_decode_req(&rqstp->rq_arg);
if (ret < 0)
diff --git a/net/sunrpc/xprtrdma/svc_rdma_rw.c b/net/sunrpc/xprtrdma/svc_rdma_rw.c
index 04cb3363172a..dc1951759a8e 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_rw.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_rw.c
@@ -680,6 +680,7 @@ static int svc_rdma_build_read_chunk(struct svc_rqst *rqstp,
struct svc_rdma_read_info *info,
__be32 *p)
{
+ unsigned int i;
int ret;
ret = -EINVAL;
@@ -702,6 +703,12 @@ static int svc_rdma_build_read_chunk(struct svc_rqst *rqstp,
info->ri_chunklen += rs_length;
}
+ /* Pages under I/O have been copied to head->rc_pages.
+ * Prevent their premature release by svc_xprt_release() .
+ */
+ for (i = 0; i < info->ri_readctxt->rc_page_count; i++)
+ rqstp->rq_pages[i] = NULL;
+
return ret;
}
@@ -817,7 +824,6 @@ int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma, struct svc_rqst *rqstp,
struct svc_rdma_recv_ctxt *head, __be32 *p)
{
struct svc_rdma_read_info *info;
- struct page **page;
int ret;
/* The request (with page list) is constructed in
@@ -844,27 +850,15 @@ int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma, struct svc_rqst *rqstp,
ret = svc_rdma_build_normal_read_chunk(rqstp, info, p);
else
ret = svc_rdma_build_pz_read_chunk(rqstp, info, p);
-
- /* Mark the start of the pages that can be used for the reply */
- if (info->ri_pageoff > 0)
- info->ri_pageno++;
- rqstp->rq_respages = &rqstp->rq_pages[info->ri_pageno];
- rqstp->rq_next_page = rqstp->rq_respages + 1;
-
if (ret < 0)
- goto out;
+ goto out_err;
ret = svc_rdma_post_chunk_ctxt(&info->ri_cc);
-
-out:
- /* Read sink pages have been moved from rqstp->rq_pages to
- * head->rc_arg.pages. Force svc_recv to refill those slots
- * in rq_pages.
- */
- for (page = rqstp->rq_pages; page < rqstp->rq_respages; page++)
- *page = NULL;
-
if (ret < 0)
- svc_rdma_read_info_free(info);
+ goto out_err;
+ return 0;
+
+out_err:
+ svc_rdma_read_info_free(info);
return ret;
}
diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
index ffef0c508f1a..8602a5f1b515 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
@@ -656,7 +656,9 @@ static void svc_rdma_save_io_pages(struct svc_rqst *rqstp,
ctxt->sc_pages[i] = rqstp->rq_respages[i];
rqstp->rq_respages[i] = NULL;
}
- rqstp->rq_next_page = rqstp->rq_respages + 1;
+
+ /* Prevent svc_xprt_release from releasing pages in rq_pages */
+ rqstp->rq_next_page = rqstp->rq_respages;
}
/* Prepare the portion of the RPC Reply that will be transmitted
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 547b2cdf1427..2848cafd4a17 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -296,7 +296,6 @@ static int rdma_listen_handler(struct rdma_cm_id *cma_id,
struct rdma_cm_event *event)
{
struct sockaddr *sap = (struct sockaddr *)&cma_id->route.addr.src_addr;
- int ret = 0;
trace_svcrdma_cm_event(event, sap);
@@ -315,7 +314,7 @@ static int rdma_listen_handler(struct rdma_cm_id *cma_id,
break;
}
- return ret;
+ return 0;
}
static int rdma_cma_handler(struct rdma_cm_id *cma_id,