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authorshamir rabinovitch <shamir.rabinovitch@oracle.com>2018-12-16 10:01:09 +0300
committerDavid S. Miller <davem@davemloft.net>2018-12-19 21:27:58 +0300
commitc75ab8a55ac1083c232e4407f52b0cadae6c1e0e (patch)
treee83b619d72b6c229928260b1a9644c79ba08dda5 /net/rds/rds.h
parentea010070d0a7497253d5a6f919f6dd107450b31a (diff)
downloadlinux-c75ab8a55ac1083c232e4407f52b0cadae6c1e0e.tar.xz
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>
Diffstat (limited to 'net/rds/rds.h')
-rw-r--r--net/rds/rds.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 4d2523100093..02ec4a3b2799 100644
--- 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);