CVE-2022-48715

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> scsi: bnx2fc: Make bnx2fc_recv_frame() mp safe<br /> <br /> Running tests with a debug kernel shows that bnx2fc_recv_frame() is<br /> modifying the per_cpu lport stats counters in a non-mpsafe way. Just boot<br /> a debug kernel and run the bnx2fc driver with the hardware enabled.<br /> <br /> [ 1391.699147] BUG: using smp_processor_id() in preemptible [00000000] code: bnx2fc_<br /> [ 1391.699160] caller is bnx2fc_recv_frame+0xbf9/0x1760 [bnx2fc]<br /> [ 1391.699174] CPU: 2 PID: 4355 Comm: bnx2fc_l2_threa Kdump: loaded Tainted: G B<br /> [ 1391.699180] Hardware name: HP ProLiant DL120 G7, BIOS J01 07/01/2013<br /> [ 1391.699183] Call Trace:<br /> [ 1391.699188] dump_stack_lvl+0x57/0x7d<br /> [ 1391.699198] check_preemption_disabled+0xc8/0xd0<br /> [ 1391.699205] bnx2fc_recv_frame+0xbf9/0x1760 [bnx2fc]<br /> [ 1391.699215] ? do_raw_spin_trylock+0xb5/0x180<br /> [ 1391.699221] ? bnx2fc_npiv_create_vports.isra.0+0x4e0/0x4e0 [bnx2fc]<br /> [ 1391.699229] ? bnx2fc_l2_rcv_thread+0xb7/0x3a0 [bnx2fc]<br /> [ 1391.699240] bnx2fc_l2_rcv_thread+0x1af/0x3a0 [bnx2fc]<br /> [ 1391.699250] ? bnx2fc_ulp_init+0xc0/0xc0 [bnx2fc]<br /> [ 1391.699258] kthread+0x364/0x420<br /> [ 1391.699263] ? _raw_spin_unlock_irq+0x24/0x50<br /> [ 1391.699268] ? set_kthread_struct+0x100/0x100<br /> [ 1391.699273] ret_from_fork+0x22/0x30<br /> <br /> Restore the old get_cpu/put_cpu code with some modifications to reduce the<br /> size of the critical section.