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Message-Id: <174957620590.185003.13986443341794227523.b4-ty@kernel.dk>
Date: Tue, 10 Jun 2025 11:23:25 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Penglei Jiang <superman.xpt@...il.com>
Cc: io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
syzbot+531502bbbe51d2f769f4@...kaller.appspotmail.com
Subject: Re: [PATCH v2] io_uring: fix use-after-free of sq->thread in
__io_uring_show_fdinfo()
On Tue, 10 Jun 2025 10:18:01 -0700, Penglei Jiang wrote:
> [BUG]
>
> [ 84.375406] ==================================================================
> [ 84.378543] BUG: KASAN: slab-use-after-free in getrusage+0x1109/0x1a60
> [ 84.381058] Read of size 8 at addr ffff88810de2d2c8 by task a.out/304
> [ 84.382977]
> [ 84.383767] CPU: 0 UID: 0 PID: 304 Comm: a.out Not tainted 6.16.0-rc1 #1 PREEMPT(voluntary)
> [ 84.383788] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
> [ 84.383819] Call Trace:
> [ 84.383841] <TASK>
> [ 84.383842] dump_stack_lvl+0x53/0x70
> [ 84.383957] print_report+0xd0/0x670
> [ 84.384008] ? __pfx__raw_spin_lock_irqsave+0x10/0x10
> [ 84.384057] ? getrusage+0x1109/0x1a60
> [ 84.384060] kasan_report+0xce/0x100
> [ 84.384063] ? getrusage+0x1109/0x1a60
> [ 84.384066] getrusage+0x1109/0x1a60
> [ 84.384070] ? __pfx_getrusage+0x10/0x10
> [ 84.384073] __io_uring_show_fdinfo+0x9fe/0x1790
> [ 84.384117] ? ksys_read+0xf7/0x1c0
> [ 84.384133] ? do_syscall_64+0xa4/0x260
> [ 84.384144] ? vsnprintf+0x591/0x1100
> [ 84.384155] ? __pfx___io_uring_show_fdinfo+0x10/0x10
> [ 84.384157] ? __pfx_vsnprintf+0x10/0x10
> [ 84.384175] ? mutex_trylock+0xcf/0x130
> [ 84.384185] ? __pfx_mutex_trylock+0x10/0x10
> [ 84.384198] ? __pfx_show_fd_locks+0x10/0x10
> [ 84.384219] ? io_uring_show_fdinfo+0x57/0x80
> [ 84.384222] io_uring_show_fdinfo+0x57/0x80
> [ 84.384224] seq_show+0x38c/0x690
> [ 84.384257] seq_read_iter+0x3f7/0x1180
> [ 84.384279] ? inode_set_ctime_current+0x160/0x4b0
> [ 84.384296] seq_read+0x271/0x3e0
> [ 84.384298] ? __pfx_seq_read+0x10/0x10
> [ 84.384300] ? __pfx__raw_spin_lock+0x10/0x10
> [ 84.384303] ? __mark_inode_dirty+0x402/0x810
> [ 84.384313] ? selinux_file_permission+0x368/0x500
> [ 84.384385] ? file_update_time+0x10f/0x160
> [ 84.384388] vfs_read+0x177/0xa40
> [ 84.384393] ? __pfx___handle_mm_fault+0x10/0x10
> [ 84.384440] ? __pfx_vfs_read+0x10/0x10
> [ 84.384443] ? mutex_lock+0x81/0xe0
> [ 84.384446] ? __pfx_mutex_lock+0x10/0x10
> [ 84.384449] ? fdget_pos+0x24d/0x4b0
> [ 84.384452] ksys_read+0xf7/0x1c0
> [ 84.384455] ? __pfx_ksys_read+0x10/0x10
> [ 84.384458] ? do_user_addr_fault+0x43b/0x9c0
> [ 84.384486] do_syscall_64+0xa4/0x260
> [ 84.384489] entry_SYSCALL_64_after_hwframe+0x77/0x7f
> [ 84.384528] RIP: 0033:0x7f0f74170fc9
> [ 84.384560] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 8
> [ 84.384563] RSP: 002b:00007fffece049e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000000
> [ 84.384588] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0f74170fc9
> [ 84.384611] RDX: 0000000000001000 RSI: 00007fffece049f0 RDI: 0000000000000004
> [ 84.384613] RBP: 00007fffece05ad0 R08: 0000000000000000 R09: 00007fffece04d90
> [ 84.384615] R10: 0000000000000000 R11: 0000000000000206 R12: 00005651720a1100
> [ 84.384617] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> [ 84.384619] </TASK>
> [ 84.384620]
> [ 84.461314] Allocated by task 298:
> [ 84.462019] kasan_save_stack+0x33/0x60
> [ 84.462598] kasan_save_track+0x14/0x30
> [ 84.463213] __kasan_slab_alloc+0x6e/0x70
> [ 84.463853] kmem_cache_alloc_node_noprof+0xe8/0x330
> [ 84.465483] copy_process+0x376/0x5e00
> [ 84.466798] create_io_thread+0xab/0xf0
> [ 84.468355] io_sq_offload_create+0x9ed/0xf20
> [ 84.470323] io_uring_setup+0x12b0/0x1cc0
> [ 84.471830] do_syscall_64+0xa4/0x260
> [ 84.473255] entry_SYSCALL_64_after_hwframe+0x77/0x7f
> [ 84.474952]
> [ 84.475758] Freed by task 22:
> [ 84.476878] kasan_save_stack+0x33/0x60
> [ 84.478400] kasan_save_track+0x14/0x30
> [ 84.479709] kasan_save_free_info+0x3b/0x60
> [ 84.480777] __kasan_slab_free+0x37/0x50
> [ 84.481299] kmem_cache_free+0xc4/0x360
> [ 84.481945] rcu_core+0x5ff/0x19f0
> [ 84.483038] handle_softirqs+0x18c/0x530
> [ 84.485407] run_ksoftirqd+0x20/0x30
> [ 84.487146] smpboot_thread_fn+0x287/0x6c0
> [ 84.488552] kthread+0x30d/0x630
> [ 84.489856] ret_from_fork+0xef/0x1a0
> [ 84.491239] ret_from_fork_asm+0x1a/0x30
> [ 84.492366]
> [ 84.493099] Last potentially related work creation:
> [ 84.495175] kasan_save_stack+0x33/0x60
> [ 84.496416] kasan_record_aux_stack+0x8c/0xa0
> [ 84.498060] __call_rcu_common.constprop.0+0x68/0x940
> [ 84.499326] __schedule+0xff2/0x2930
> [ 84.499970] __cond_resched+0x4c/0x80
> [ 84.501305] mutex_lock+0x5c/0xe0
> [ 84.502374] io_uring_del_tctx_node+0xe1/0x2b0
> [ 84.504251] io_uring_clean_tctx+0xb7/0x160
> [ 84.505377] io_uring_cancel_generic+0x34e/0x760
> [ 84.507126] do_exit+0x240/0x2350
> [ 84.508667] do_group_exit+0xab/0x220
> [ 84.509927] __x64_sys_exit_group+0x39/0x40
> [ 84.511223] x64_sys_call+0x1243/0x1840
> [ 84.512795] do_syscall_64+0xa4/0x260
> [ 84.514044] entry_SYSCALL_64_after_hwframe+0x77/0x7f
> [ 84.515792]
> [ 84.516374] The buggy address belongs to the object at ffff88810de2cb00
> [ 84.516374] which belongs to the cache task_struct of size 3712
> [ 84.521449] The buggy address is located 1992 bytes inside of
> [ 84.521449] freed 3712-byte region [ffff88810de2cb00, ffff88810de2d980)
> [ 84.524996]
> [ 84.525514] The buggy address belongs to the physical page:
> [ 84.527383] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10de28
> [ 84.530907] head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
> [ 84.533573] flags: 0x200000000000040(head|node=0|zone=2)
> [ 84.535366] page_type: f5(slab)
> [ 84.536410] raw: 0200000000000040 ffff8881001acdc0 dead000000000122 0000000000000000
> [ 84.538807] raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
> [ 84.542033] head: 0200000000000040 ffff8881001acdc0 dead000000000122 0000000000000000
> [ 84.545121] head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
> [ 84.547663] head: 0200000000000003 ffffea0004378a01 00000000ffffffff 00000000ffffffff
> [ 84.549959] head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
> [ 84.552180] page dumped because: kasan: bad access detected
> [ 84.554098]
> [ 84.554798] Memory state around the buggy address:
> [ 84.556798] ffff88810de2d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [ 84.559258] ffff88810de2d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [ 84.562112] >ffff88810de2d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [ 84.564710] ^
> [ 84.567076] ffff88810de2d300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [ 84.569900] ffff88810de2d380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> [ 84.573018] ==================================================================
>
> [...]
Applied, thanks!
[1/1] io_uring: fix use-after-free of sq->thread in __io_uring_show_fdinfo()
commit: ac0b8b327a5677dc6fecdf353d808161525b1ff0
Best regards,
--
Jens Axboe
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