Bug 2320247 (CVE-2024-47734)

Summary: CVE-2024-47734 kernel: bonding: Fix unnecessary warnings and logs from bond_xdp_get_xmit_slave()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Bug Depends On: 2320373    
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Description OSIDB Bzimport 2024-10-21 13:05:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bonding: Fix unnecessary warnings and logs from bond_xdp_get_xmit_slave()

syzbot reported a WARNING in bond_xdp_get_xmit_slave. To reproduce
this[1], one bond device (bond1) has xdpdrv, which increases
bpf_master_redirect_enabled_key. Another bond device (bond0) which is
unsupported by XDP but its slave (veth3) has xdpgeneric that returns
XDP_TX. This triggers WARN_ON_ONCE() from the xdp_master_redirect().
To reduce unnecessary warnings and improve log management, we need to
delete the WARN_ON_ONCE() and add ratelimit to the netdev_err().

[1] Steps to reproduce:
    # Needs tx_xdp with return XDP_TX;
    ip l add veth0 type veth peer veth1
    ip l add veth3 type veth peer veth4
    ip l add bond0 type bond mode 6 # BOND_MODE_ALB, unsupported by XDP
    ip l add bond1 type bond # BOND_MODE_ROUNDROBIN by default
    ip l set veth0 master bond1
    ip l set bond1 up
    # Increases bpf_master_redirect_enabled_key
    ip l set dev bond1 xdpdrv object tx_xdp.o section xdp_tx
    ip l set veth3 master bond0
    ip l set bond0 up
    ip l set veth4 up
    # Triggers WARN_ON_ONCE() from the xdp_master_redirect()
    ip l set veth3 xdpgeneric object tx_xdp.o section xdp_tx
Comment 1 Robb Gatica 2024-10-21 15:36:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102107-CVE-2024-47734-ad75@gregkh/T
Comment 3 Rohit Keshri 2024-10-24 04:15:14 UTC 
I could not relate to any security related threat in this, so I would request for a CVE rejection.