diff options
| author | Dag Moxnes <dag.moxnes@oracle.com> | 2019-08-23 16:03:18 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-08-23 14:55:52 -0700 |
| commit | bf1867db9b850fff2dd54a1a117a684a10b8cd90 (patch) | |
| tree | 6a24f3846825650b85630061b57808e6996bbceb /net/rds/ib_recv.c | |
| parent | 87cade2997c9210cfeb625957e44b865a89d0c13 (diff) | |
net/rds: Whitelist rdma_cookie and rx_tstamp for usercopy
Add the RDMA cookie and RX timestamp to the usercopy whitelist.
After the introduction of hardened usercopy whitelisting
(https://lwn.net/Articles/727322/), a warning is displayed when the
RDMA cookie or RX timestamp is copied to userspace:
kernel: WARNING: CPU: 3 PID: 5750 at
mm/usercopy.c:81 usercopy_warn+0x8e/0xa6
[...]
kernel: Call Trace:
kernel: __check_heap_object+0xb8/0x11b
kernel: __check_object_size+0xe3/0x1bc
kernel: put_cmsg+0x95/0x115
kernel: rds_recvmsg+0x43d/0x620 [rds]
kernel: sock_recvmsg+0x43/0x4a
kernel: ___sys_recvmsg+0xda/0x1e6
kernel: ? __handle_mm_fault+0xcae/0xf79
kernel: __sys_recvmsg+0x51/0x8a
kernel: SyS_recvmsg+0x12/0x1c
kernel: do_syscall_64+0x79/0x1ae
When the whitelisting feature was introduced, the memory for the RDMA
cookie and RX timestamp in RDS was not added to the whitelist, causing
the warning above.
Signed-off-by: Dag Moxnes <dag.moxnes@oracle.com>
Tested-by: Jenny <jenny.x.xu@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/ib_recv.c')
| -rw-r--r-- | net/rds/ib_recv.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c index 1a8a4a760b84..a0f99bbf362c 100644 --- a/net/rds/ib_recv.c +++ b/net/rds/ib_recv.c @@ -1048,9 +1048,14 @@ int rds_ib_recv_init(void) si_meminfo(&si); rds_ib_sysctl_max_recv_allocation = si.totalram / 3 * PAGE_SIZE / RDS_FRAG_SIZE; - rds_ib_incoming_slab = kmem_cache_create("rds_ib_incoming", - sizeof(struct rds_ib_incoming), - 0, SLAB_HWCACHE_ALIGN, NULL); + rds_ib_incoming_slab = + kmem_cache_create_usercopy("rds_ib_incoming", + sizeof(struct rds_ib_incoming), + 0, SLAB_HWCACHE_ALIGN, + offsetof(struct rds_ib_incoming, + ii_inc.i_usercopy), + sizeof(struct rds_inc_usercopy), + NULL); if (!rds_ib_incoming_slab) goto out; |