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6f63e919fe
ieee80211_monitor_select_queue() validates the skb length using skb->len before dereferencing pointers into skb->data to access the 802.11 header. However, skb->len includes data in both the linear head buffer and non-linear fragments/pages. When AF_PACKET sends a packet large enough to become non-linear, the 802.11 header at skb->data + len_rthdr may extend past the linear head buffer even though skb->len appears sufficient. This leads to a slab-out-of-bounds read when accessing hdr->frame_control, as the kernel reads beyond the allocated skb head buffer: BUG: KASAN: slab-out-of-bounds in ieee80211_monitor_select_queue+0x1ed/0x220 syzbot has hit the same issues. Fix this by checking skb_headlen(skb) (which gives the length of the linear data region) instead of skb->len before dereferencing skb->data pointers. This ensures the required bytes are actually present in the linear portion of the skb. Apply the same fix to ieee80211_validate_radiotap_len() which has the same class of bug: it uses skb->len to validate accesses to skb->data, and to the corresponding checks in ieee80211_monitor_start_xmit(): for drivers advertising NETIF_F_SG the skb is not linearized before ndo_start_xmit, so the 802.11 header can be read past the linear buffer there as well. Fixes:cf0277e714("mac80211: fix skb buffering issue") Fixes:9b8a74e348("[MAC80211]: Improve sanity checks on injected packets") Reported-by: AutonomousCodeSecurity@microsoft.com Reported-by: syzbot+610e40369bc02181bad0@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=610e40369bc02181bad0 Reported-by: syzbot+878643e0580bc580f883@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=878643e0580bc580f883 Assisted-by: GitHub-Copilot:claude-opus-4.6 Signed-off-by: Cen Zhang (Microsoft) <cenzhang@linux.microsoft.com> Reviewed-by: Francis Perron <francis@akrites.dev> Link: https://patch.msgid.link/20260925024408.32143-1-cenzhang@linux.microsoft.com Signed-off-by: Johannes Berg <johannes.berg@intel.com>
6716 lines
179 KiB
6716 lines
179 KiB