syzbot reported the following uninit-value access issue:
=====================================================
BUG: KMSAN: uninit-value in strlen lib/string.c:418 [inline]
BUG: KMSAN: uninit-value in strstr+0xb8/0x2f0 lib/string.c:756
strlen lib/string.c:418 [inline]
strstr+0xb8/0x2f0 lib/string.c:756
tipc_nl_node_reset_link_stats+0x3ea/0xb50 net/tipc/node.c:2595
genl_family_rcv_msg_doit net/netlink/genetlink.c:971 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline]
genl_rcv_msg+0x11ec/0x1290 net/netlink/genetlink.c:1066
netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2545
genl_rcv+0x40/0x60 net/netlink/genetlink.c:1075
netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
netlink_unicast+0xf47/0x1250 net/netlink/af_netlink.c:1368
netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910
sock_sendmsg_nosec net/socket.c:730 [inline]
sock_sendmsg net/socket.c:753 [inline]
____sys_sendmsg+0x9c2/0xd60 net/socket.c:2541
___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
__sys_sendmsg net/socket.c:2624 [inline]
__do_sys_sendmsg net/socket.c:2633 [inline]
__se_sys_sendmsg net/socket.c:2631 [inline]
__x64_sys_sendmsg+0x307/0x490 net/socket.c:2631
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Uninit was created at:
slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767
slab_alloc_node mm/slub.c:3478 [inline]
kmem_cache_alloc_node+0x577/0xa80 mm/slub.c:3523
kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:559
__alloc_skb+0x318/0x740 net/core/skbuff.c:650
alloc_skb include/linux/skbuff.h:1286 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1214 [inline]
netlink_sendmsg+0xb34/0x13d0 net/netlink/af_netlink.c:1885
sock_sendmsg_nosec net/socket.c:730 [inline]
sock_sendmsg net/socket.c:753 [inline]
____sys_sendmsg+0x9c2/0xd60 net/socket.c:2541
___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
__sys_sendmsg net/socket.c:2624 [inline]
__do_sys_sendmsg net/socket.c:2633 [inline]
__se_sys_sendmsg net/socket.c:2631 [inline]
__x64_sys_sendmsg+0x307/0x490 net/socket.c:2631
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Link names must be null-terminated strings. If a link name which is not
null-terminated is passed through netlink, strstr() and similar functions
can cause buffer overrun. This causes the above issue.
This patch fixes this issue by returning -EINVAL if a non-null-terminated
link name is passed.
Fixes: ae36342b50a9 ("tipc: add link stat reset to new netlink api")
Reported-and-tested-by: [email protected]
Closes: https://syzkaller.appspot.com/bug?extid=5138ca807af9d2b42574
Signed-off-by: Shigeru Yoshida <[email protected]>
---
net/tipc/node.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/tipc/node.c b/net/tipc/node.c
index 3105abe97bb9..f167bdafc034 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -2586,6 +2586,10 @@ int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
+ if (link_name[strnlen(link_name,
+ nla_len(attrs[TIPC_NLA_LINK_NAME]))] != '\0')
+ return -EINVAL;
+
err = -EINVAL;
if (!strcmp(link_name, tipc_bclink_name)) {
err = tipc_bclink_reset_stats(net, tipc_bc_sndlink(net));
--
2.41.0
On 9/26/23 20:19, Jon Maloy wrote:
>
>
> On 2023-09-24 02:03, Shigeru Yoshida wrote:
>> syzbot reported the following uninit-value access issue:
>>
>> =====================================================
>> BUG: KMSAN: uninit-value in strlen lib/string.c:418 [inline]
>> BUG: KMSAN: uninit-value in strstr+0xb8/0x2f0 lib/string.c:756
>> strlen lib/string.c:418 [inline]
>> strstr+0xb8/0x2f0 lib/string.c:756
>> tipc_nl_node_reset_link_stats+0x3ea/0xb50 net/tipc/node.c:2595
>> genl_family_rcv_msg_doit net/netlink/genetlink.c:971 [inline]
>> genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline]
>> genl_rcv_msg+0x11ec/0x1290 net/netlink/genetlink.c:1066
>> netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2545
>> genl_rcv+0x40/0x60 net/netlink/genetlink.c:1075
>> netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
>> netlink_unicast+0xf47/0x1250 net/netlink/af_netlink.c:1368
>> netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910
>> sock_sendmsg_nosec net/socket.c:730 [inline]
>> sock_sendmsg net/socket.c:753 [inline]
>> ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2541
>> ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
>> __sys_sendmsg net/socket.c:2624 [inline]
>> __do_sys_sendmsg net/socket.c:2633 [inline]
>> __se_sys_sendmsg net/socket.c:2631 [inline]
>> __x64_sys_sendmsg+0x307/0x490 net/socket.c:2631
>> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>> do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
>> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>>
>> Uninit was created at:
>> slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767
>> slab_alloc_node mm/slub.c:3478 [inline]
>> kmem_cache_alloc_node+0x577/0xa80 mm/slub.c:3523
>> kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:559
>> __alloc_skb+0x318/0x740 net/core/skbuff.c:650
>> alloc_skb include/linux/skbuff.h:1286 [inline]
>> netlink_alloc_large_skb net/netlink/af_netlink.c:1214 [inline]
>> netlink_sendmsg+0xb34/0x13d0 net/netlink/af_netlink.c:1885
>> sock_sendmsg_nosec net/socket.c:730 [inline]
>> sock_sendmsg net/socket.c:753 [inline]
>> ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2541
>> ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
>> __sys_sendmsg net/socket.c:2624 [inline]
>> __do_sys_sendmsg net/socket.c:2633 [inline]
>> __se_sys_sendmsg net/socket.c:2631 [inline]
>> __x64_sys_sendmsg+0x307/0x490 net/socket.c:2631
>> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>> do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
>> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>>
>> Link names must be null-terminated strings. If a link name which is not
>> null-terminated is passed through netlink, strstr() and similar functions
>> can cause buffer overrun. This causes the above issue.
>>
>> This patch fixes this issue by returning -EINVAL if a non-null-terminated
>> link name is passed.
>>
>> Fixes: ae36342b50a9 ("tipc: add link stat reset to new netlink api")
>> Reported-and-tested-by: [email protected]
>> Closes: https://syzkaller.appspot.com/bug?extid=5138ca807af9d2b42574
>> Signed-off-by: Shigeru Yoshida <[email protected]>
>> ---
>> net/tipc/node.c | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/net/tipc/node.c b/net/tipc/node.c
>> index 3105abe97bb9..f167bdafc034 100644
>> --- a/net/tipc/node.c
>> +++ b/net/tipc/node.c
>> @@ -2586,6 +2586,10 @@ int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
>> link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
>> + if (link_name[strnlen(link_name,
>> + nla_len(attrs[TIPC_NLA_LINK_NAME]))] != '\0')
>> + return -EINVAL;
>> +
>> err = -EINVAL;
>> if (!strcmp(link_name, tipc_bclink_name)) {
>> err = tipc_bclink_reset_stats(net, tipc_bc_sndlink(net));
> Acked-by: Jon Maloy <[email protected]>
Thanks! syzbot reported very similar issue regarding bearer name too.
I've sent a patch for that issue.
Thanks,
Shigeru
On 2023-09-24 02:03, Shigeru Yoshida wrote:
> syzbot reported the following uninit-value access issue:
>
> =====================================================
> BUG: KMSAN: uninit-value in strlen lib/string.c:418 [inline]
> BUG: KMSAN: uninit-value in strstr+0xb8/0x2f0 lib/string.c:756
> strlen lib/string.c:418 [inline]
> strstr+0xb8/0x2f0 lib/string.c:756
> tipc_nl_node_reset_link_stats+0x3ea/0xb50 net/tipc/node.c:2595
> genl_family_rcv_msg_doit net/netlink/genetlink.c:971 [inline]
> genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline]
> genl_rcv_msg+0x11ec/0x1290 net/netlink/genetlink.c:1066
> netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2545
> genl_rcv+0x40/0x60 net/netlink/genetlink.c:1075
> netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
> netlink_unicast+0xf47/0x1250 net/netlink/af_netlink.c:1368
> netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910
> sock_sendmsg_nosec net/socket.c:730 [inline]
> sock_sendmsg net/socket.c:753 [inline]
> ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2541
> ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
> __sys_sendmsg net/socket.c:2624 [inline]
> __do_sys_sendmsg net/socket.c:2633 [inline]
> __se_sys_sendmsg net/socket.c:2631 [inline]
> __x64_sys_sendmsg+0x307/0x490 net/socket.c:2631
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Uninit was created at:
> slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767
> slab_alloc_node mm/slub.c:3478 [inline]
> kmem_cache_alloc_node+0x577/0xa80 mm/slub.c:3523
> kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:559
> __alloc_skb+0x318/0x740 net/core/skbuff.c:650
> alloc_skb include/linux/skbuff.h:1286 [inline]
> netlink_alloc_large_skb net/netlink/af_netlink.c:1214 [inline]
> netlink_sendmsg+0xb34/0x13d0 net/netlink/af_netlink.c:1885
> sock_sendmsg_nosec net/socket.c:730 [inline]
> sock_sendmsg net/socket.c:753 [inline]
> ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2541
> ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
> __sys_sendmsg net/socket.c:2624 [inline]
> __do_sys_sendmsg net/socket.c:2633 [inline]
> __se_sys_sendmsg net/socket.c:2631 [inline]
> __x64_sys_sendmsg+0x307/0x490 net/socket.c:2631
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Link names must be null-terminated strings. If a link name which is not
> null-terminated is passed through netlink, strstr() and similar functions
> can cause buffer overrun. This causes the above issue.
>
> This patch fixes this issue by returning -EINVAL if a non-null-terminated
> link name is passed.
>
> Fixes: ae36342b50a9 ("tipc: add link stat reset to new netlink api")
> Reported-and-tested-by: [email protected]
> Closes: https://syzkaller.appspot.com/bug?extid=5138ca807af9d2b42574
> Signed-off-by: Shigeru Yoshida <[email protected]>
> ---
> net/tipc/node.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/net/tipc/node.c b/net/tipc/node.c
> index 3105abe97bb9..f167bdafc034 100644
> --- a/net/tipc/node.c
> +++ b/net/tipc/node.c
> @@ -2586,6 +2586,10 @@ int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
>
> link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
>
> + if (link_name[strnlen(link_name,
> + nla_len(attrs[TIPC_NLA_LINK_NAME]))] != '\0')
> + return -EINVAL;
> +
> err = -EINVAL;
> if (!strcmp(link_name, tipc_bclink_name)) {
> err = tipc_bclink_reset_stats(net, tipc_bc_sndlink(net));
Acked-by: Jon Maloy <[email protected]>
On Sun, 2023-09-24 at 15:03 +0900, Shigeru Yoshida wrote:
> syzbot reported the following uninit-value access issue:
>
> =====================================================
> BUG: KMSAN: uninit-value in strlen lib/string.c:418 [inline]
> BUG: KMSAN: uninit-value in strstr+0xb8/0x2f0 lib/string.c:756
> strlen lib/string.c:418 [inline]
> strstr+0xb8/0x2f0 lib/string.c:756
> tipc_nl_node_reset_link_stats+0x3ea/0xb50 net/tipc/node.c:2595
> genl_family_rcv_msg_doit net/netlink/genetlink.c:971 [inline]
> genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline]
> genl_rcv_msg+0x11ec/0x1290 net/netlink/genetlink.c:1066
> netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2545
> genl_rcv+0x40/0x60 net/netlink/genetlink.c:1075
> netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
> netlink_unicast+0xf47/0x1250 net/netlink/af_netlink.c:1368
> netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910
> sock_sendmsg_nosec net/socket.c:730 [inline]
> sock_sendmsg net/socket.c:753 [inline]
> ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2541
> ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
> __sys_sendmsg net/socket.c:2624 [inline]
> __do_sys_sendmsg net/socket.c:2633 [inline]
> __se_sys_sendmsg net/socket.c:2631 [inline]
> __x64_sys_sendmsg+0x307/0x490 net/socket.c:2631
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Uninit was created at:
> slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767
> slab_alloc_node mm/slub.c:3478 [inline]
> kmem_cache_alloc_node+0x577/0xa80 mm/slub.c:3523
> kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:559
> __alloc_skb+0x318/0x740 net/core/skbuff.c:650
> alloc_skb include/linux/skbuff.h:1286 [inline]
> netlink_alloc_large_skb net/netlink/af_netlink.c:1214 [inline]
> netlink_sendmsg+0xb34/0x13d0 net/netlink/af_netlink.c:1885
> sock_sendmsg_nosec net/socket.c:730 [inline]
> sock_sendmsg net/socket.c:753 [inline]
> ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2541
> ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
> __sys_sendmsg net/socket.c:2624 [inline]
> __do_sys_sendmsg net/socket.c:2633 [inline]
> __se_sys_sendmsg net/socket.c:2631 [inline]
> __x64_sys_sendmsg+0x307/0x490 net/socket.c:2631
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Link names must be null-terminated strings. If a link name which is not
> null-terminated is passed through netlink, strstr() and similar functions
> can cause buffer overrun. This causes the above issue.
>
> This patch fixes this issue by returning -EINVAL if a non-null-terminated
> link name is passed.
>
> Fixes: ae36342b50a9 ("tipc: add link stat reset to new netlink api")
> Reported-and-tested-by: [email protected]
> Closes: https://syzkaller.appspot.com/bug?extid=5138ca807af9d2b42574
> Signed-off-by: Shigeru Yoshida <[email protected]>
> ---
> net/tipc/node.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/net/tipc/node.c b/net/tipc/node.c
> index 3105abe97bb9..f167bdafc034 100644
> --- a/net/tipc/node.c
> +++ b/net/tipc/node.c
> @@ -2586,6 +2586,10 @@ int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
>
> link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
>
> + if (link_name[strnlen(link_name,
> + nla_len(attrs[TIPC_NLA_LINK_NAME]))] != '\0')
> + return -EINVAL;
I have the same comment as for the other tipc patch, please use
nla_strscpy instead, thanks!
Paolo
On Tue, 03 Oct 2023 10:58:54 +0200, Paolo Abeni wrote:
> On Sun, 2023-09-24 at 15:03 +0900, Shigeru Yoshida wrote:
>> syzbot reported the following uninit-value access issue:
>>
>> =====================================================
>> BUG: KMSAN: uninit-value in strlen lib/string.c:418 [inline]
>> BUG: KMSAN: uninit-value in strstr+0xb8/0x2f0 lib/string.c:756
>> strlen lib/string.c:418 [inline]
>> strstr+0xb8/0x2f0 lib/string.c:756
>> tipc_nl_node_reset_link_stats+0x3ea/0xb50 net/tipc/node.c:2595
>> genl_family_rcv_msg_doit net/netlink/genetlink.c:971 [inline]
>> genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline]
>> genl_rcv_msg+0x11ec/0x1290 net/netlink/genetlink.c:1066
>> netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2545
>> genl_rcv+0x40/0x60 net/netlink/genetlink.c:1075
>> netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
>> netlink_unicast+0xf47/0x1250 net/netlink/af_netlink.c:1368
>> netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1910
>> sock_sendmsg_nosec net/socket.c:730 [inline]
>> sock_sendmsg net/socket.c:753 [inline]
>> ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2541
>> ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
>> __sys_sendmsg net/socket.c:2624 [inline]
>> __do_sys_sendmsg net/socket.c:2633 [inline]
>> __se_sys_sendmsg net/socket.c:2631 [inline]
>> __x64_sys_sendmsg+0x307/0x490 net/socket.c:2631
>> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>> do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
>> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>>
>> Uninit was created at:
>> slab_post_alloc_hook+0x12f/0xb70 mm/slab.h:767
>> slab_alloc_node mm/slub.c:3478 [inline]
>> kmem_cache_alloc_node+0x577/0xa80 mm/slub.c:3523
>> kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:559
>> __alloc_skb+0x318/0x740 net/core/skbuff.c:650
>> alloc_skb include/linux/skbuff.h:1286 [inline]
>> netlink_alloc_large_skb net/netlink/af_netlink.c:1214 [inline]
>> netlink_sendmsg+0xb34/0x13d0 net/netlink/af_netlink.c:1885
>> sock_sendmsg_nosec net/socket.c:730 [inline]
>> sock_sendmsg net/socket.c:753 [inline]
>> ____sys_sendmsg+0x9c2/0xd60 net/socket.c:2541
>> ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2595
>> __sys_sendmsg net/socket.c:2624 [inline]
>> __do_sys_sendmsg net/socket.c:2633 [inline]
>> __se_sys_sendmsg net/socket.c:2631 [inline]
>> __x64_sys_sendmsg+0x307/0x490 net/socket.c:2631
>> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>> do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
>> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>>
>> Link names must be null-terminated strings. If a link name which is not
>> null-terminated is passed through netlink, strstr() and similar functions
>> can cause buffer overrun. This causes the above issue.
>>
>> This patch fixes this issue by returning -EINVAL if a non-null-terminated
>> link name is passed.
>>
>> Fixes: ae36342b50a9 ("tipc: add link stat reset to new netlink api")
>> Reported-and-tested-by: [email protected]
>> Closes: https://syzkaller.appspot.com/bug?extid=5138ca807af9d2b42574
>> Signed-off-by: Shigeru Yoshida <[email protected]>
>> ---
>> net/tipc/node.c | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/net/tipc/node.c b/net/tipc/node.c
>> index 3105abe97bb9..f167bdafc034 100644
>> --- a/net/tipc/node.c
>> +++ b/net/tipc/node.c
>> @@ -2586,6 +2586,10 @@ int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
>>
>> link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
>>
>> + if (link_name[strnlen(link_name,
>> + nla_len(attrs[TIPC_NLA_LINK_NAME]))] != '\0')
>> + return -EINVAL;
>
> I have the same comment as for the other tipc patch, please use
> nla_strscpy instead, thanks!
Thank you for your comment. I'll send a v2 patch using nla_strscpy()
and check if other usage of TIPC_NLA_LINK_NAME have the same issue.
Thanks,
Shigeru
>
> Paolo
>