CVE-2022-49096

In the Linux kernel, the following vulnerability has been resolved:

net: sfc: add missing xdp queue reinitialization

After rx/tx ring buffer size is changed, kernel panic occurs when

it acts XDP_TX or XDP_REDIRECT.

When tx/rx ring buffer size is changed(ethtool -G), sfc driver

reallocates and reinitializes rx and tx queues and their buffer

(tx_queue->buffer).

But it misses reinitializing xdp queues(efx->xdp_tx_queues).

So, while it is acting XDP_TX or XDP_REDIRECT, it uses the uninitialized

tx_queue->buffer.

A new function efx_set_xdp_channels() is separated from efx_set_channels()

to handle only xdp queues.

Splat looks like:

BUG: kernel NULL pointer dereference, address: 000000000000002a

#PF: supervisor write access in kernel mode

#PF: error_code(0x0002) - not-present page

PGD 0 P4D 0

Oops: 0002 [#4] PREEMPT SMP NOPTI

RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]

CPU: 2 PID: 0 Comm: swapper/2 Tainted: G D 5.17.0+ #55 e8beeee8289528f11357029357cf

Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80

RSP: 0018:ffff92f121e45c60 EFLAGS: 00010297

RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]

RAX: 0000000000000040 RBX: ffff92ea506895c0 RCX: ffffffffc0330870

RDX: 0000000000000001 RSI: 00000001139b10ce RDI: ffff92ea506895c0

RBP: ffffffffc0358a80 R08: 00000001139b110d R09: 0000000000000000

R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040

R13: 0000000000000018 R14: 00000001139b10ce R15: ffff92ea506895c0

FS: 0000000000000000(0000) GS:ffff92f121ec0000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80

CR2: 000000000000002a CR3: 00000003e6810004 CR4: 00000000007706e0

RSP: 0018:ffff92f121e85c60 EFLAGS: 00010297

PKRU: 55555554

RAX: 0000000000000040 RBX: ffff92ea50689700 RCX: ffffffffc0330870

RDX: 0000000000000001 RSI: 00000001145a90ce RDI: ffff92ea50689700

RBP: ffffffffc0358a80 R08: 00000001145a910d R09: 0000000000000000

R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040

R13: 0000000000000018 R14: 00000001145a90ce R15: ffff92ea50689700

FS: 0000000000000000(0000) GS:ffff92f121e80000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 000000000000002a CR3: 00000003e6810005 CR4: 00000000007706e0

PKRU: 55555554

Call Trace:

<IRQ>

efx_xdp_tx_buffers+0x12b/0x3d0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]

__efx_rx_packet+0x5c3/0x930 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]

efx_rx_packet+0x28c/0x2e0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]

efx_ef10_ev_process+0x5f8/0xf40 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]

? enqueue_task_fair+0x95/0x550

efx_poll+0xc4/0x360 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]