tap: add missing verification for short frame #104
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jira VULN-8274 cve CVE-2024-41090 commit-author Si-Wei Liu <[email protected]> commit ed7f2af The cited commit missed to check against the validity of the frame length in the tap_get_user_xdp() path, which could cause a corrupted skb to be sent downstack. Even before the skb is transmitted, the tap_get_user_xdp()-->skb_set_network_header() may assume the size is more than ETH_HLEN. Once transmitted, this could either cause out-of-bound access beyond the actual length, or confuse the underlayer with incorrect or inconsistent header length in the skb metadata. In the alternative path, tap_get_user() already prohibits short frame which has the length less than Ethernet header size from being transmitted. This is to drop any frame shorter than the Ethernet header size just like how tap_get_user() does. CVE: CVE-2024-41090 Link: https://lore.kernel.org/netdev/[email protected]/ Fixes: 0efac27 ("tap: accept an array of XDP buffs through sendmsg()") Cc: [email protected] Signed-off-by: Si-Wei Liu <[email protected]> Signed-off-by: Dongli Zhang <[email protected]> Reviewed-by: Willem de Bruijn <[email protected]> Reviewed-by: Paolo Abeni <[email protected]> Reviewed-by: Jason Wang <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]> (cherry picked from commit ed7f2af) Signed-off-by: Jeremy Allison <[email protected]>
bmastbergen
approved these changes
Feb 5, 2025
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kernel-selftest-baseline-9.2.log
kernel-selftest-9.2-patched.log
jira VULN-8274
cve CVE-2024-41090
commit-author Si-Wei Liu [email protected]
commit ed7f2af
The cited commit missed to check against the validity of the frame length in the tap_get_user_xdp() path, which could cause a corrupted skb to be sent downstack. Even before the skb is transmitted, the tap_get_user_xdp()-->skb_set_network_header() may assume the size is more than ETH_HLEN. Once transmitted, this could either cause out-of-bound access beyond the actual length, or confuse the underlayer with incorrect or inconsistent header length in the skb metadata.
In the alternative path, tap_get_user() already prohibits short frame which has the length less than Ethernet header size from being transmitted.
This is to drop any frame shorter than the Ethernet header size just like how tap_get_user() does.
CVE: CVE-2024-41090
Link: https://lore.kernel.org/netdev/[email protected]/ Fixes: 0efac27 ("tap: accept an array of XDP buffs through sendmsg()")
Cc: [email protected]
Signed-off-by: Si-Wei Liu [email protected]
Signed-off-by: Dongli Zhang [email protected]
Reviewed-by: Willem de Bruijn [email protected]
Reviewed-by: Paolo Abeni [email protected]
Reviewed-by: Jason Wang [email protected]
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski [email protected]
(cherry picked from commit ed7f2af)