net/rds: remove user triggered WARN_ON in rds_sendmsg

per comment from Leon in rdma mailing list
https://lkml.org/lkml/2018/10/31/312 :

Please don't forget to remove user triggered WARN_ON.
https://lwn.net/Articles/769365/
"Greg Kroah-Hartman raised the problem of core kernel API code that will
use WARN_ON_ONCE() to complain about bad usage; that will not generate
the desired result if WARN_ON_ONCE() is configured to crash the machine.
He was told that the code should just call pr_warn() instead, and that
the called function should return an error in such situations. It was
generally agreed that any WARN_ON() or WARN_ON_ONCE() calls that can be
triggered from user space need to be fixed."

in addition harden rds_sendmsg to detect and overcome issues with
invalid sg count and fail the sendmsg.

Suggested-by: Leon Romanovsky <leon@kernel.org>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: shamir rabinovitch <shamir.rabinovitch@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/rds/message.c b/net/rds/message.c
index 4b00b11..f139420 100644 (file)
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -308,16 +308,27 @@ out:
 /*
  * RDS ops use this to grab SG entries from the rm's sg pool.
  */
-struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents)
+struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents,
+                                         int *ret)
 {
        struct scatterlist *sg_first = (struct scatterlist *) &rm[1];
        struct scatterlist *sg_ret;
 
-       WARN_ON(rm->m_used_sgs + nents > rm->m_total_sgs);
-       WARN_ON(!nents);
+       if (WARN_ON(!ret))
+               return NULL;
 
-       if (rm->m_used_sgs + nents > rm->m_total_sgs)
+       if (nents <= 0) {
+               pr_warn("rds: alloc sgs failed! nents <= 0\n");
+               *ret = -EINVAL;
                return NULL;
+       }
+
+       if (rm->m_used_sgs + nents > rm->m_total_sgs) {
+               pr_warn("rds: alloc sgs failed! total %d used %d nents %d\n",
+                       rm->m_total_sgs, rm->m_used_sgs, nents);
+               *ret = -ENOMEM;
+               return NULL;
+       }
 
        sg_ret = &sg_first[rm->m_used_sgs];
        sg_init_table(sg_ret, nents);
@@ -332,6 +343,7 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in
        unsigned int i;
        int num_sgs = ceil(total_len, PAGE_SIZE);
        int extra_bytes = num_sgs * sizeof(struct scatterlist);
+       int ret;
 
        rm = rds_message_alloc(extra_bytes, GFP_NOWAIT);
        if (!rm)
@@ -340,10 +352,10 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in
        set_bit(RDS_MSG_PAGEVEC, &rm->m_flags);
        rm->m_inc.i_hdr.h_len = cpu_to_be32(total_len);
        rm->data.op_nents = ceil(total_len, PAGE_SIZE);
-       rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs);
+       rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs, &ret);
        if (!rm->data.op_sg) {
                rds_message_put(rm);
-               return ERR_PTR(-ENOMEM);
+               return ERR_PTR(ret);
        }
 
        for (i = 0; i < rm->data.op_nents; ++i) {

diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index e1965d9..182ab84 100644 (file)
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -623,11 +623,9 @@ int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
        op->op_active = 1;
        op->op_recverr = rs->rs_recverr;
        WARN_ON(!nr_pages);
-       op->op_sg = rds_message_alloc_sgs(rm, nr_pages);
-       if (!op->op_sg) {
-               ret = -ENOMEM;
+       op->op_sg = rds_message_alloc_sgs(rm, nr_pages, &ret);
+       if (!op->op_sg)
                goto out_pages;
-       }
 
        if (op->op_notify || op->op_recverr) {
                /* We allocate an uninitialized notifier here, because
@@ -839,11 +837,9 @@ int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
        rm->atomic.op_silent = !!(args->flags & RDS_RDMA_SILENT);
        rm->atomic.op_active = 1;
        rm->atomic.op_recverr = rs->rs_recverr;
-       rm->atomic.op_sg = rds_message_alloc_sgs(rm, 1);
-       if (!rm->atomic.op_sg) {
-               ret = -ENOMEM;
+       rm->atomic.op_sg = rds_message_alloc_sgs(rm, 1, &ret);
+       if (!rm->atomic.op_sg)
                goto err;
-       }
 
        /* verify 8 byte-aligned */
        if (args->local_addr & 0x7) {

diff --git a/net/rds/rds.h b/net/rds/rds.h
index 4d25231..02ec4a3 100644 (file)
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -839,7 +839,8 @@ rds_conn_connecting(struct rds_connection *conn)
 
 /* message.c */
 struct rds_message *rds_message_alloc(unsigned int nents, gfp_t gfp);
-struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents);
+struct scatterlist *rds_message_alloc_sgs(struct rds_message *rm, int nents,
+                                         int *ret);
 int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from,
                               bool zcopy);
 struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned int total_len);

diff --git a/net/rds/send.c b/net/rds/send.c
index ec2267c..b39b307 100644 (file)
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -886,6 +886,9 @@ static int rds_rm_size(struct msghdr *msg, int num_sgs,
        bool zcopy_cookie = false;
        struct rds_iov_vector *iov, *tmp_iov;
 
+       if (num_sgs < 0)
+               return -EINVAL;
+
        for_each_cmsghdr(cmsg, msg) {
                if (!CMSG_OK(msg, cmsg))
                        return -EINVAL;
@@ -1259,11 +1262,9 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
 
        /* Attach data to the rm */
        if (payload_len) {
-               rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs);
-               if (!rm->data.op_sg) {
-                       ret = -ENOMEM;
+               rm->data.op_sg = rds_message_alloc_sgs(rm, num_sgs, &ret);
+               if (!rm->data.op_sg)
                        goto out;
-               }
                ret = rds_message_copy_from_user(rm, &msg->msg_iter, zcopy);
                if (ret)
                        goto out;