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Date: Wed, 29 Mar 2023 16:07:24 -0300
From: Pedro Tammela <pctammela@...atatu.com>
To: Seth Forshee <sforshee@...italocean.com>,
Jakub Kicinski <kuba@...nel.org>
Cc: syzbot <syzbot+b53a9c0d1ea4ad62da8b@...kaller.appspotmail.com>,
davem@...emloft.net, edumazet@...gle.com, jhs@...atatu.com,
jiri@...nulli.us, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, pabeni@...hat.com,
syzkaller-bugs@...glegroups.com, xiyou.wangcong@...il.com
Subject: Re: [syzbot] [net?] KASAN: slab-use-after-free Write in
mini_qdisc_pair_swap
On 29/03/2023 00:37, Seth Forshee wrote:
> On Tue, Mar 28, 2023 at 06:47:33PM -0700, Jakub Kicinski wrote:
>> Seth, does this looks related to commit 267463823adb ("net: sch:
>> eliminate unnecessary RCU waits in mini_qdisc_pair_swap()")
>> by any chance?
>
> I don't see how it could be. The memory being written is part of the
> qdisc private memory, and tc_new_tfilter() takes a reference to the
> qdisc. If that memory has been freed doesn't it mean that something has
> done an unbalanced qdisc_put()?
>
Reverting Seth's patches (85c0c3eb9a66 and 267463823adb) leads to these
traces with the reproducer:
[ 52.704956][ C0] ------------[ cut here ]------------
[ 52.705568][ C0] ODEBUG: free active (active state 1) object:0
[ 52.706542][ C0] WARNING: CPU: 0 PID: 0 at lib/debugobjects.c0
[ 52.707283][ C0] Modules linked in:
[ 52.707602][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.0
[ 52.708304][ C0] Hardware name: QEMU Standard PC (i440FX + PI4
[ 52.709032][ C0] RIP: 0010:debug_print_object+0x196/0x290
[ 52.709509][ C0] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85e
[ 52.711011][ C0] RSP: 0018:ffffc90000007cd0 EFLAGS: 00010282
[ 52.711510][ C0] RAX: 0000000000000000 RBX: 0000000000000003 0
[ 52.712125][ C0] RDX: ffffffff8c495800 RSI: ffffffff814b96d7 1
[ 52.712748][ C0] RBP: 0000000000000001 R08: 0000000000000001 0
[ 52.713370][ C0] R10: 0000000000000000 R11: 203a47554245444f 0
[ 52.713983][ C0] R13: ffffffff8aa6e960 R14: 0000000000000000 8
[ 52.714609][ C0] FS: 0000000000000000(0000) GS:ffff8881f5a000
[ 52.715356][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008003
[ 52.715863][ C0] CR2: 000055914686f020 CR3: 000000011e856000 0
[ 52.716486][ C0] Call Trace:
[ 52.716742][ C0] <IRQ>
[ 52.716969][ C0] debug_check_no_obj_freed+0x302/0x420
[ 52.717423][ C0] slab_free_freelist_hook+0xec/0x1c0
[ 52.717848][ C0] ? rcu_core+0x818/0x1930
[ 52.718204][ C0] __kmem_cache_free+0xaf/0x2e0
[ 52.718590][ C0] rcu_core+0x818/0x1930
[ 52.718938][ C0] ? rcu_report_dead+0x610/0x610
[ 52.719328][ C0] __do_softirq+0x1d4/0x8ef
[ 52.719689][ C0] __irq_exit_rcu+0x11d/0x190
[ 52.720062][ C0] irq_exit_rcu+0x9/0x20
[ 52.720402][ C0] sysvec_apic_timer_interrupt+0x97/0xc0
[ 52.720842][ C0] </IRQ>
[ 52.721070][ C0] <TASK>
[ 52.721300][ C0] asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 52.721779][ C0] RIP: 0010:default_idle+0xf/0x20
[ 52.722172][ C0] Code: 89 07 49 c7 c0 08 00 00 00 4d 29 c8 4c5
[ 52.723631][ C0] RSP: 0018:ffffffff8c407e30 EFLAGS: 00000202
[ 52.724096][ C0] RAX: 000000000007897f RBX: 0000000000000000 6
[ 52.724702][ C0] RDX: 0000000000000000 RSI: 0000000000000001 0
[ 52.725335][ C0] RBP: ffffffff8c495800 R08: 0000000000000001 b
[ 52.725957][ C0] R10: ffffed103eb46d95 R11: 0000000000000000 0
[ 52.726550][ C0] R13: 0000000000000000 R14: ffffffff8e7834d0 0
[ 52.727162][ C0] ? ct_kernel_exit+0x1d6/0x240
[ 52.727542][ C0] default_idle_call+0x67/0xa0
[ 52.727912][ C0] do_idle+0x31e/0x3e0
[ 52.728241][ C0] ? arch_cpu_idle_exit+0x30/0x30
[ 52.728635][ C0] cpu_startup_entry+0x18/0x20
[ 52.729006][ C0] rest_init+0x16d/0x2b0
[ 52.729338][ C0] ? regulator_has_full_constraints+0x9/0x20
[ 52.729815][ C0] ? trace_init_perf_perm_irq_work_exit+0x20/00
[ 52.730309][ C0] arch_call_rest_init+0x13/0x30
[ 52.730703][ C0] start_kernel+0x352/0x4c0
[ 52.731087][ C0] secondary_startup_64_no_verify+0xce/0xdb
[ 52.731611][ C0] </TASK>
[ 52.731870][ C0] Kernel panic - not syncing: kernel: panic_on.
[ 52.732445][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.0
[ 52.733140][ C0] Hardware name: QEMU Standard PC (i440FX + PI4
[ 52.733867][ C0] Call Trace:
[ 52.734143][ C0] <IRQ>
[ 52.734380][ C0] dump_stack_lvl+0xd9/0x150
[ 52.734769][ C0] panic+0x684/0x730
[ 52.735082][ C0] ? panic_smp_self_stop+0x90/0x90
[ 52.735322][ C0] ? show_trace_log_lvl+0x285/0x390
[ 52.735322][ C0] ? debug_print_object+0x196/0x290
[ 52.735322][ C0] check_panic_on_warn+0xb1/0xc0
[ 52.735322][ C0] __warn+0xf2/0x390
[ 52.735322][ C0] ? debug_print_object+0x196/0x290
[ 52.735322][ C0] report_bug+0x2dd/0x500
[ 52.735322][ C0] handle_bug+0x3c/0x70
[ 52.735322][ C0] exc_invalid_op+0x18/0x50
[ 52.735322][ C0] asm_exc_invalid_op+0x1a/0x20
[ 52.735322][ C0] RIP: 0010:debug_print_object+0x196/0x290
[ 52.735322][ C0] Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85e
[ 52.735322][ C0] RSP: 0018:ffffc90000007cd0 EFLAGS: 00010282
[ 52.735322][ C0] RAX: 0000000000000000 RBX: 0000000000000003 0
[ 52.735322][ C0] RDX: ffffffff8c495800 RSI: ffffffff814b96d7 1
[ 52.735322][ C0] RBP: 0000000000000001 R08: 0000000000000001 0
[ 52.735322][ C0] R10: 0000000000000000 R11: 203a47554245444f 0
[ 52.735322][ C0] R13: ffffffff8aa6e960 R14: 0000000000000000 8
[ 52.735322][ C0] ? __warn_printk+0x187/0x310
[ 52.735322][ C0] debug_check_no_obj_freed+0x302/0x420
[ 52.735322][ C0] slab_free_freelist_hook+0xec/0x1c0
[ 52.735322][ C0] ? rcu_core+0x818/0x1930
[ 52.735322][ C0] __kmem_cache_free+0xaf/0x2e0
[ 52.735322][ C0] rcu_core+0x818/0x1930
[ 52.735322][ C0] ? rcu_report_dead+0x610/0x610
[ 52.735322][ C0] __do_softirq+0x1d4/0x8ef
[ 52.735322][ C0] __irq_exit_rcu+0x11d/0x190
[ 52.735322][ C0] irq_exit_rcu+0x9/0x20
[ 52.735322][ C0] sysvec_apic_timer_interrupt+0x97/0xc0
[ 52.735322][ C0] </IRQ>
[ 52.735322][ C0] <TASK>
[ 52.735322][ C0] asm_sysvec_apic_timer_interrupt+0x1a/0x20
[ 52.735322][ C0] RIP: 0010:default_idle+0xf/0x20
[ 52.735322][ C0] Code: 89 07 49 c7 c0 08 00 00 00 4d 29 c8 4c5
[ 52.735322][ C0] RSP: 0018:ffffffff8c407e30 EFLAGS: 00000202
[ 52.735322][ C0] RAX: 000000000007897f RBX: 0000000000000000 6
[ 52.735322][ C0] RDX: 0000000000000000 RSI: 0000000000000001 0
[ 52.735322][ C0] RBP: ffffffff8c495800 R08: 0000000000000001 b
[ 52.735322][ C0] R10: ffffed103eb46d95 R11: 0000000000000000 0
[ 52.735322][ C0] R13: 0000000000000000 R14: ffffffff8e7834d0 0
[ 52.735322][ C0] ? ct_kernel_exit+0x1d6/0x240
[ 52.735322][ C0] default_idle_call+0x67/0xa0
[ 52.735322][ C0] do_idle+0x31e/0x3e0
[ 52.735322][ C0] ? arch_cpu_idle_exit+0x30/0x30
[ 52.735322][ C0] cpu_startup_entry+0x18/0x20
[ 52.735322][ C0] rest_init+0x16d/0x2b0
[ 52.735322][ C0] ? regulator_has_full_constraints+0x9/0x20
[ 52.735322][ C0] ? trace_init_perf_perm_irq_work_exit+0x20/00
[ 52.735322][ C0] arch_call_rest_init+0x13/0x30
[ 52.735322][ C0] start_kernel+0x352/0x4c0
[ 52.735322][ C0] secondary_startup_64_no_verify+0xce/0xdb
[ 52.735322][ C0] </TASK>
[ 52.735322][ C0] Kernel Offset: disabled
[ 52.735322][ C0] Rebooting in 86400 seconds..
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