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syzbot found WARNING in rds_rdma_extra_size [1] when RDS_CMSG_RDMA_ARGS control message is passed with user-controlled 0x40001 bytes of args->nr_local, causing order >= MAX_ORDER condition. The exact value 0x40001 can be checked with UIO_MAXIOV which is 0x400. So for kcalloc() 0x400 iovecs with sizeof(struct rds_iovec) = 0x10 is the closest limit, with 0x10 leftover. Same condition is currently done in rds_cmsg_rdma_args(). [1] WARNING: mm/page_alloc.c:5011 [..] Call Trace: alloc_pages_current+0x18c/0x2a0 mm/mempolicy.c:2267 alloc_pages include/linux/gfp.h:547 [inline] kmalloc_order+0x2e/0xb0 mm/slab_common.c:837 kmalloc_order_trace+0x14/0x120 mm/slab_common.c:853 kmalloc_array include/linux/slab.h:592 [inline] kcalloc include/linux/slab.h:621 [inline] rds_rdma_extra_size+0xb2/0x3b0 net/rds/rdma.c:568 rds_rm_size net/rds/send.c:928 [inline] Reported-by: syzbot+1bd2b07f93745fa38425@syzkaller.appspotmail.com Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@gmail.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Link: https://lore.kernel.org/r/20210201203233.1324704-1-snovitoll@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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| .. | ||
| af_rds.c | ||
| bind.c | ||
| cong.c | ||
| connection.c | ||
| ib_cm.c | ||
| ib_frmr.c | ||
| ib_mr.h | ||
| ib_rdma.c | ||
| ib_recv.c | ||
| ib_ring.c | ||
| ib_send.c | ||
| ib_stats.c | ||
| ib_sysctl.c | ||
| ib.c | ||
| ib.h | ||
| info.c | ||
| info.h | ||
| Kconfig | ||
| loop.c | ||
| loop.h | ||
| Makefile | ||
| message.c | ||
| page.c | ||
| rdma_transport.c | ||
| rdma_transport.h | ||
| rdma.c | ||
| rds_single_path.h | ||
| rds.h | ||
| recv.c | ||
| send.c | ||
| stats.c | ||
| sysctl.c | ||
| tcp_connect.c | ||
| tcp_listen.c | ||
| tcp_recv.c | ||
| tcp_send.c | ||
| tcp_stats.c | ||
| tcp.c | ||
| tcp.h | ||
| threads.c | ||
| transport.c | ||