On Mon, May 10, 2021 at 05:46:00PM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@xxxxxxxxxx>
>
> The user_entry_size is supplied by the user and later used as a
> denominator to calculate number of entries. The zero supplied by
> the user will trigger the following divide-by-zero error:
>
> divide error: 0000 [#1] SMP KASAN PTI
> CPU: 4 PID: 497 Comm: c_repro Not tainted 5.13.0-rc1+ #281
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
> RIP: 0010:ib_uverbs_handler_UVERBS_METHOD_QUERY_GID_TABLE+0x1b1/0x510
> Code: 87 59 03 00 00 e8 9f ab 1e ff 48 8d bd a8 00 00 00 e8 d3 70 41 ff 44 0f b7 b5 a8 00 00 00 e8 86 ab 1e ff 31 d2 4c 89 f0 31 ff <49> f7 f5 48 89 d6 48 89 54 24 10 48 89 04 24 e8 1b ad 1e ff 48 8b
> RSP: 0018:ffff88810416f828 EFLAGS: 00010246
> RAX: 0000000000000008 RBX: 1ffff1102082df09 RCX: ffffffff82183f3d
> RDX: 0000000000000000 RSI: ffff888105f2da00 RDI: 0000000000000000
> RBP: ffff88810416fa98 R08: 0000000000000001 R09: ffffed102082df5f
> R10: ffff88810416faf7 R11: ffffed102082df5e R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000008 R15: ffff88810416faf0
> FS: 00007f5715efa740(0000) GS:ffff88811a700000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000840 CR3: 000000010c2e0001 CR4: 0000000000370ea0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> ? ib_uverbs_handler_UVERBS_METHOD_INFO_HANDLES+0x4b0/0x4b0
> ? __radix_tree_lookup+0x190/0x190
> ? write_comp_data+0x2a/0x80
> ? __sanitizer_cov_trace_pc+0x1d/0x50
> ? __bitmap_subset+0x9a/0x130
> ib_uverbs_cmd_verbs+0x1546/0x1940
> ? __kernel_text_address+0xe/0x30
> ? ib_uverbs_handler_UVERBS_METHOD_INFO_HANDLES+0x4b0/0x4b0
> ? uverbs_fill_udata+0x510/0x510
> ? putname+0xa8/0xc0
> ? kasan_set_free_info+0x20/0x30
> ? __kasan_slab_free+0xed/0x130
> ? kmem_cache_free+0x94/0x410
> ? putname+0xa8/0xc0
> ? do_sys_openat2+0x477/0x780
> ? do_sys_open+0xc8/0x150
> ? __sanitizer_cov_trace_pc+0x1d/0x50
> ? restore_nameidata+0x8a/0xb0
> ? __sanitizer_cov_trace_pc+0x1d/0x50
> ? do_filp_open+0x166/0x1f0
> ? should_fail+0x78/0x2a0
> ? may_open_dev+0x80/0x80
> ? write_comp_data+0x2a/0x80
> ? __sanitizer_cov_trace_pc+0x1d/0x50
> ib_uverbs_ioctl+0x186/0x240
> ? ib_uverbs_cmd_verbs+0x1940/0x1940
> ? fsnotify+0xba0/0xba0
> ? write_comp_data+0x2a/0x80
> ? write_comp_data+0x2a/0x80
> ? ib_uverbs_cmd_verbs+0x1940/0x1940
> __x64_sys_ioctl+0x38a/0x1220
> ? generic_block_fiemap+0x60/0x60
> ? putname+0xa8/0xc0
> ? __sanitizer_cov_trace_pc+0x1d/0x50
> ? do_sys_openat2+0x47c/0x780
> ? file_open_root+0x420/0x420
> ? __sanitizer_cov_trace_pc+0x1d/0x50
> ? cgroup_rstat_updated+0x66/0x1a0
> ? do_sys_open+0xc8/0x150
> ? filp_open+0x80/0x80
> ? write_comp_data+0x2a/0x80
> ? fpregs_assert_state_consistent+0x90/0xa0
> ? __sanitizer_cov_trace_pc+0x1d/0x50
> ? exit_to_user_mode_prepare+0x35/0x160
> do_syscall_64+0x3f/0x80
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x7f5715ff0f59
> Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 73 01 c3 48 8b 0d 07 6f 0c 00 f7 d8 64 89 01 48
> RSP: 002b:00007ffd33031858 EFLAGS: 00000213 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5715ff0f59
> RDX: 0000000020000180 RSI: 00000000c0181b01 RDI: 0000000000000003
> RBP: 00007ffd33031870 R08: 00007ffd33031950 R09: 00007ffd33031950
> R10: 0000000000000000 R11: 0000000000000213 R12: 0000558a0989b060
> R13: 00007ffd33031950 R14: 0000000000000000 R15: 0000000000000000
> Modules linked in:
> Dumping ftrace buffer:
> (ftrace buffer empty)
> ---[ end trace 7776f38b0b269133 ]---
> RIP: 0010:ib_uverbs_handler_UVERBS_METHOD_QUERY_GID_TABLE+0x1b1/0x510
> Code: 87 59 03 00 00 e8 9f ab 1e ff 48 8d bd a8 00 00 00 e8 d3 70 41 ff 44 0f b7 b5 a8 00 00 00 e8 86 ab 1e ff 31 d2 4c 89 f0 31 ff <49> f7 f5 48 89 d6 48 89 54 24 10 48 89 04 24 e8 1b ad 1e ff 48 8b
> RSP: 0018:ffff88810416f828 EFLAGS: 00010246
> RAX: 0000000000000008 RBX: 1ffff1102082df09 RCX: ffffffff82183f3d
> RDX: 0000000000000000 RSI: ffff888105f2da00 RDI: 0000000000000000
> RBP: ffff88810416fa98 R08: 0000000000000001 R09: ffffed102082df5f
> R10: ffff88810416faf7 R11: ffffed102082df5e R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000008 R15: ffff88810416faf0
> FS: 00007f5715efa740(0000) GS:ffff88811a700000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000840 CR3: 000000010c2e0001 CR4: 0000000000370ea0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Kernel panic - not syncing: Fatal exception
> Dumping ftrace buffer:
> (ftrace buffer empty)
> Kernel Offset: disabled
> Rebooting in 1 seconds..
>
> Fixes: 9f85cbe50aa0 ("RDMA/uverbs: Expose the new GID query API to user space")
> Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
> ---
> drivers/infiniband/core/uverbs_std_types_device.c | 3 +++
> 1 file changed, 3 insertions(+)
Applied to for-rc, thanks
Jason
