Dokyung Song <dokyung.song@xxxxxxxxx> wrote: > This patch fixes an intra-object buffer overflow in brcmfmac that occurs > when the device provides a 'bsscfgidx' equal to or greater than the > buffer size. The patch adds a check that leads to a safe failure if that > is the case. > > This fixes CVE-2022-3628. > > UBSAN: array-index-out-of-bounds in drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c > index 52 is out of range for type 'brcmf_if *[16]' > CPU: 0 PID: 1898 Comm: kworker/0:2 Tainted: G O 5.14.0+ #132 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014 > Workqueue: events brcmf_fweh_event_worker > Call Trace: > dump_stack_lvl+0x57/0x7d > ubsan_epilogue+0x5/0x40 > __ubsan_handle_out_of_bounds+0x69/0x80 > ? memcpy+0x39/0x60 > brcmf_fweh_event_worker+0xae1/0xc00 > ? brcmf_fweh_call_event_handler.isra.0+0x100/0x100 > ? rcu_read_lock_sched_held+0xa1/0xd0 > ? rcu_read_lock_bh_held+0xb0/0xb0 > ? lockdep_hardirqs_on_prepare+0x273/0x3e0 > process_one_work+0x873/0x13e0 > ? lock_release+0x640/0x640 > ? pwq_dec_nr_in_flight+0x320/0x320 > ? rwlock_bug.part.0+0x90/0x90 > worker_thread+0x8b/0xd10 > ? __kthread_parkme+0xd9/0x1d0 > ? process_one_work+0x13e0/0x13e0 > kthread+0x379/0x450 > ? _raw_spin_unlock_irq+0x24/0x30 > ? set_kthread_struct+0x100/0x100 > ret_from_fork+0x1f/0x30 > ================================================================================ > general protection fault, probably for non-canonical address 0xe5601c0020023fff: 0000 [#1] SMP KASAN > KASAN: maybe wild-memory-access in range [0x2b0100010011fff8-0x2b0100010011ffff] > CPU: 0 PID: 1898 Comm: kworker/0:2 Tainted: G O 5.14.0+ #132 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014 > Workqueue: events brcmf_fweh_event_worker > RIP: 0010:brcmf_fweh_call_event_handler.isra.0+0x42/0x100 > Code: 89 f5 53 48 89 fb 48 83 ec 08 e8 79 0b 38 fe 48 85 ed 74 7e e8 6f 0b 38 fe 48 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 8b 00 00 00 4c 8b 7d 00 44 89 e0 48 ba 00 00 00 > RSP: 0018:ffffc9000259fbd8 EFLAGS: 00010207 > RAX: dffffc0000000000 RBX: ffff888115d8cd50 RCX: 0000000000000000 > RDX: 0560200020023fff RSI: ffffffff8304bc91 RDI: ffff888115d8cd50 > RBP: 2b0100010011ffff R08: ffff888112340050 R09: ffffed1023549809 > R10: ffff88811aa4c047 R11: ffffed1023549808 R12: 0000000000000045 > R13: ffffc9000259fca0 R14: ffff888112340050 R15: ffff888112340000 > FS: 0000000000000000(0000) GS:ffff88811aa00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000004053ccc0 CR3: 0000000112740000 CR4: 0000000000750ef0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > PKRU: 55555554 > Call Trace: > brcmf_fweh_event_worker+0x117/0xc00 > ? brcmf_fweh_call_event_handler.isra.0+0x100/0x100 > ? rcu_read_lock_sched_held+0xa1/0xd0 > ? rcu_read_lock_bh_held+0xb0/0xb0 > ? lockdep_hardirqs_on_prepare+0x273/0x3e0 > process_one_work+0x873/0x13e0 > ? lock_release+0x640/0x640 > ? pwq_dec_nr_in_flight+0x320/0x320 > ? rwlock_bug.part.0+0x90/0x90 > worker_thread+0x8b/0xd10 > ? __kthread_parkme+0xd9/0x1d0 > ? process_one_work+0x13e0/0x13e0 > kthread+0x379/0x450 > ? _raw_spin_unlock_irq+0x24/0x30 > ? set_kthread_struct+0x100/0x100 > ret_from_fork+0x1f/0x30 > Modules linked in: 88XXau(O) 88x2bu(O) > ---[ end trace 41d302138f3ff55a ]--- > RIP: 0010:brcmf_fweh_call_event_handler.isra.0+0x42/0x100 > Code: 89 f5 53 48 89 fb 48 83 ec 08 e8 79 0b 38 fe 48 85 ed 74 7e e8 6f 0b 38 fe 48 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 8b 00 00 00 4c 8b 7d 00 44 89 e0 48 ba 00 00 00 > RSP: 0018:ffffc9000259fbd8 EFLAGS: 00010207 > RAX: dffffc0000000000 RBX: ffff888115d8cd50 RCX: 0000000000000000 > RDX: 0560200020023fff RSI: ffffffff8304bc91 RDI: ffff888115d8cd50 > RBP: 2b0100010011ffff R08: ffff888112340050 R09: ffffed1023549809 > R10: ffff88811aa4c047 R11: ffffed1023549808 R12: 0000000000000045 > R13: ffffc9000259fca0 R14: ffff888112340050 R15: ffff888112340000 > FS: 0000000000000000(0000) GS:ffff88811aa00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000004053ccc0 CR3: 0000000112740000 CR4: 0000000000750ef0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > PKRU: 55555554 > Kernel panic - not syncing: Fatal exception > > Reported-by: Dokyung Song <dokyungs@xxxxxxxxxxxx> > Reported-by: Jisoo Jang <jisoo.jang@xxxxxxxxxxxx> > Reported-by: Minsuk Kang <linuxlovemin@xxxxxxxxxxxx> > Reviewed-by: Arend van Spriel <aspriel@xxxxxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> > Signed-off-by: Dokyung Song <dokyung.song@xxxxxxxxx> Patch applied to wireless.git, thanks. 6788ba8aed4e wifi: brcmfmac: Fix potential buffer overflow in brcmf_fweh_event_worker() -- https://patchwork.kernel.org/project/linux-wireless/patch/20221021061359.GA550858@laguna/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
