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 <[email protected]>
---
drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
index 39d24e07f306..5b69b9268c75 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
@@ -396,7 +396,7 @@ static int rmnet_fill_info(struct sk_buff *skb, const struct net_device *dev)
struct rtnl_link_ops rmnet_link_ops __read_mostly = {
.kind = "rmnet",
- .maxtype = __IFLA_RMNET_MAX,
+ .maxtype = IFLA_RMNET_MAX,
.priv_size = sizeof(struct rmnet_priv),
.setup = rmnet_vnd_setup,
.validate = rmnet_rtnl_validate,
--
2.17.1
On 1/9/2024 11:14 PM, 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 <[email protected]>
> ---
> drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
> index 39d24e07f306..5b69b9268c75 100644
> --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
> +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
> @@ -396,7 +396,7 @@ static int rmnet_fill_info(struct sk_buff *skb, const struct net_device *dev)
>
> struct rtnl_link_ops rmnet_link_ops __read_mostly = {
> .kind = "rmnet",
> - .maxtype = __IFLA_RMNET_MAX,
> + .maxtype = IFLA_RMNET_MAX,
> .priv_size = sizeof(struct rmnet_priv),
> .setup = rmnet_vnd_setup,
> .validate = rmnet_rtnl_validate,
Thanks for fixing this
Reviewed-by: Subash Abhinov Kasiviswanathan <[email protected]>
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 <[email protected]>
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 <[email protected]>
Wed, Jan 10, 2024 at 07:14:00AM CET, [email protected] 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 <[email protected]>
Reviewed-by: Jiri Pirko <[email protected]>
Btw, any idea why this rmnet thing, which clearly looks like a
softdevice, is in vendor directory where drivers for real devices should
reside?
On 1/10/2024 9:32 AM, Jiri Pirko wrote:
> Wed, Jan 10, 2024 at 07:14:00AM CET, [email protected] 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 <[email protected]>
>
> Reviewed-by: Jiri Pirko <[email protected]>
>
> Btw, any idea why this rmnet thing, which clearly looks like a
> softdevice, is in vendor directory where drivers for real devices should
> reside?
>
I believe we had discussed this during the initial implementation patch
series and concluded to move the code to drivers. Link for reference -
https://lkml.kernel.org/netdev/[email protected]/
Wed, Jan 10, 2024 at 07:16:38PM CET, [email protected] wrote:
>On 1/10/2024 9:32 AM, Jiri Pirko wrote:
>> Wed, Jan 10, 2024 at 07:14:00AM CET, [email protected] 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 <[email protected]>
>>
>> Reviewed-by: Jiri Pirko <[email protected]>
>>
>> Btw, any idea why this rmnet thing, which clearly looks like a
>> softdevice, is in vendor directory where drivers for real devices should
>> reside?
>>
>
>I believe we had discussed this during the initial implementation patch
>series and concluded to move the code to drivers. Link for reference -
>
>https://lkml.kernel.org/netdev/[email protected]/
Okay, I forgot of course. Still, this is quite odd beast :/
Hello:
This patch was applied to netdev/net.git (main)
by Jakub Kicinski <[email protected]>:
On Wed, 10 Jan 2024 14:14:00 +0800 you 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
>
> [...]
Here is the summary with links:
- [net,v1] net: qualcomm: rmnet: fix global oob in rmnet_policy
https://git.kernel.org/netdev/net/c/b33fb5b801c6
You are awesome, thank you!
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