Messages in this thread | | | Date | Wed, 10 Jan 2024 13:55:52 +0000 | From | Simon Horman <> | Subject | Re: [PATCH net v1] net: qualcomm: rmnet: fix global oob in rmnet_policy |
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On Wed, Jan 10, 2024 at 02:14:00PM +0800, Lin Ma wrote: > The variable rmnet_link_ops assign a *bigger* maxtype which leads to a > global out-of-bounds read when parsing the netlink attributes. See bug > trace below: > > ================================================================== > BUG: KASAN: global-out-of-bounds in validate_nla lib/nlattr.c:386 [inline] > BUG: KASAN: global-out-of-bounds in __nla_validate_parse+0x24af/0x2750 lib/nlattr.c:600 > Read of size 1 at addr ffffffff92c438d0 by task syz-executor.6/84207 > > CPU: 0 PID: 84207 Comm: syz-executor.6 Tainted: G N 6.1.0 #3 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106 > print_address_description mm/kasan/report.c:284 [inline] > print_report+0x172/0x475 mm/kasan/report.c:395 > kasan_report+0xbb/0x1c0 mm/kasan/report.c:495 > validate_nla lib/nlattr.c:386 [inline] > __nla_validate_parse+0x24af/0x2750 lib/nlattr.c:600 > __nla_parse+0x3e/0x50 lib/nlattr.c:697 > nla_parse_nested_deprecated include/net/netlink.h:1248 [inline] > __rtnl_newlink+0x50a/0x1880 net/core/rtnetlink.c:3485 > rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3594 > rtnetlink_rcv_msg+0x43c/0xd70 net/core/rtnetlink.c:6091 > netlink_rcv_skb+0x14f/0x410 net/netlink/af_netlink.c:2540 > netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] > netlink_unicast+0x54e/0x800 net/netlink/af_netlink.c:1345 > netlink_sendmsg+0x930/0xe50 net/netlink/af_netlink.c:1921 > sock_sendmsg_nosec net/socket.c:714 [inline] > sock_sendmsg+0x154/0x190 net/socket.c:734 > ____sys_sendmsg+0x6df/0x840 net/socket.c:2482 > ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536 > __sys_sendmsg+0xf3/0x1c0 net/socket.c:2565 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7fdcf2072359 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fdcf13e3168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00007fdcf219ff80 RCX: 00007fdcf2072359 > RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003 > RBP: 00007fdcf20bd493 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007fffbb8d7bdf R14: 00007fdcf13e3300 R15: 0000000000022000 > </TASK> > > The buggy address belongs to the variable: > rmnet_policy+0x30/0xe0 > > The buggy address belongs to the physical page: > page:0000000065bdeb3c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x155243 > flags: 0x200000000001000(reserved|node=0|zone=2) > raw: 0200000000001000 ffffea00055490c8 ffffea00055490c8 0000000000000000 > raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffffffff92c43780: f9 f9 f9 f9 00 00 00 02 f9 f9 f9 f9 00 00 00 07 > ffffffff92c43800: f9 f9 f9 f9 00 00 00 05 f9 f9 f9 f9 06 f9 f9 f9 > >ffffffff92c43880: f9 f9 f9 f9 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 > ^ > ffffffff92c43900: 00 00 00 00 00 00 00 00 07 f9 f9 f9 f9 f9 f9 f9 > ffffffff92c43980: 00 00 00 07 f9 f9 f9 f9 00 00 00 05 f9 f9 f9 f9 > > According to the comment of `nla_parse_nested_deprecated`, the maxtype > should be len(destination array) - 1. Hence use `IFLA_RMNET_MAX` here. > > Fixes: 14452ca3b5ce ("net: qualcomm: rmnet: Export mux_id and flags to netlink") > Signed-off-by: Lin Ma <linma@zju.edu.cn>
Thanks,
I agree with your analysis, proposed fix, and that the problem was introduced in it's current form by the cited commit.
Reviewed-by: Simon Horman <horms@kernel.org>
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