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RDMA/uverbs: Fix slab-out-of-bounds in ib_uverbs_ex_create_flow
The check of cmd.flow_attr.size should check into account the size of the reserved field (2 bytes), otherwise user can provide a size which will cause a slab-out-of-bounds warning below. ================================================================== BUG: KASAN: slab-out-of-bounds in ib_uverbs_ex_create_flow+0x1740/0x1d00 Read of size 2 at addr ffff880068dff1a6 by task syz-executor775/269 CPU: 0 PID: 269 Comm: syz-executor775 Not tainted 4.18.0-rc1+ #245 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.11.0-0-g63451fca13-prebuilt.qemu-project.org 04/01/2014 Call Trace: dump_stack+0xef/0x17e print_address_description+0x83/0x3b0 kasan_report+0x18d/0x4d0 ib_uverbs_ex_create_flow+0x1740/0x1d00 ib_uverbs_write+0x923/0x1010 __vfs_write+0x10d/0x720 vfs_write+0x1b0/0x550 ksys_write+0xc6/0x1a0 do_syscall_64+0xa7/0x590 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x433899 Code: fd ff 48 81 c4 80 00 00 00 e9 f1 fe ff ff 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b 91 fd ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc2724db58 EFLAGS: 00000217 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000020006880 RCX: 0000000000433899 RDX: 00000000000000e0 RSI: 0000000020002480 RDI: 0000000000000003 RBP: 00000000006d7018 R08: 00000000004002f8 R09: 00000000004002f8 R10: 00000000004002f8 R11: 0000000000000217 R12: 0000000000000000 R13: 000000000040cd20 R14: 000000000040cdb0 R15: 0000000000000006 Allocated by task 269: kasan_kmalloc+0xa0/0xd0 __kmalloc+0x1a9/0x510 ib_uverbs_ex_create_flow+0x26c/0x1d00 ib_uverbs_write+0x923/0x1010 __vfs_write+0x10d/0x720 vfs_write+0x1b0/0x550 ksys_write+0xc6/0x1a0 do_syscall_64+0xa7/0x590 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 0: __kasan_slab_free+0x12e/0x180 kfree+0x159/0x630 detach_buf+0x559/0x7a0 virtqueue_get_buf_ctx+0x3cc/0xab0 virtblk_done+0x1eb/0x3d0 vring_interrupt+0x16d/0x2b0 __handle_irq_event_percpu+0x10a/0x980 handle_irq_event_percpu+0x77/0x190 handle_irq_event+0xc6/0x1a0 handle_edge_irq+0x211/0xd80 handle_irq+0x3d/0x60 do_IRQ+0x9b/0x220 The buggy address belongs to the object at ffff880068dff180 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 38 bytes inside of 64-byte region [ffff880068dff180, ffff880068dff1c0) The buggy address belongs to the page: page:ffffea0001a37fc0 count:1 mapcount:0 mapping:ffff88006c401780 index:0x0 flags: 0x4000000000000100(slab) raw: 4000000000000100 ffffea0001a31100 0000001100000011 ffff88006c401780 raw: 0000000000000000 00000000802a002a 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff880068dff080: fb fb fb fb fc fc fc fc fb fb fb fb fb fb fb fb ffff880068dff100: fc fc fc fc fb fb fb fb fb fb fb fb fc fc fc fc >ffff880068dff180: 00 00 00 00 07 fc fc fc fc fc fc fc fb fb fb fb ^ ffff880068dff200: fb fb fb fb fc fc fc fc 00 00 00 00 00 00 fc fc ffff880068dff280: fc fc fc fc 00 00 00 00 00 00 00 00 fc fc fc fc ================================================================== Cc: <stable@vger.kernel.org> # 3.12 Fixes: f884827 ("IB/core: clarify overflow/underflow checks on ib_create/destroy_flow") Cc: syzkaller <syzkaller@googlegroups.com> Reported-by: Noa Osherovich <noaos@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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