* Re: [syzbot] [ext4?] [vfs?] KASAN: use-after-free Read in signalfd_cleanup [not found] <000000000000f4b96605f20e5e2f@google.com> @ 2023-01-12 22:40 ` syzbot 2023-01-13 2:12 ` [io_uring] " Eric Biggers 0 siblings, 1 reply; 4+ messages in thread From: syzbot @ 2023-01-12 22:40 UTC (permalink / raw) To: adilger.kernel, linux-ext4, linux-fsdevel, linux-kernel, llvm, nathan, ndesaulniers, syzkaller-bugs, trix, tytso, viro syzbot has found a reproducer for the following issue on: HEAD commit: 0a093b2893c7 Add linux-next specific files for 20230112 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=10a992a1480000 kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5 dashboard link: https://syzkaller.appspot.com/bug?extid=8317cc9c082c19d576a0 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11f672ee480000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1357774a480000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8317cc9c082c19d576a0@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 Read of size 8 at addr ffff88801d1508f0 by task syz-executor378/5077 CPU: 0 PID: 5077 Comm: syz-executor378 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x15e/0x45d mm/kasan/report.c:417 kasan_report+0xc0/0xf0 mm/kasan/report.c:517 __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 __wake_up_common_lock+0xd4/0x140 kernel/sched/wait.c:138 __wake_up kernel/sched/wait.c:160 [inline] __wake_up_pollfree+0x1d/0x60 kernel/sched/wait.c:246 wake_up_pollfree include/linux/wait.h:271 [inline] signalfd_cleanup+0x46/0x60 fs/signalfd.c:38 __cleanup_sighand kernel/fork.c:1688 [inline] __cleanup_sighand+0x76/0xb0 kernel/fork.c:1685 __exit_signal kernel/exit.c:209 [inline] release_task+0xbfa/0x1870 kernel/exit.c:255 wait_task_zombie kernel/exit.c:1198 [inline] wait_consider_task+0x306d/0x3ce0 kernel/exit.c:1425 do_wait_thread kernel/exit.c:1488 [inline] do_wait+0x7cd/0xd90 kernel/exit.c:1605 kernel_wait4+0x150/0x260 kernel/exit.c:1768 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1796 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7facd1d06656 Code: 0f 1f 40 00 31 c9 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 49 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 90 48 83 ec 28 89 54 24 14 48 89 74 24 RSP: 002b:00007ffc250fbf98 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: ffffffffffffffda RBX: 00007ffc250fc050 RCX: 00007facd1d06656 RDX: 0000000040000001 RSI: 00007ffc250fbfcc RDI: 00000000ffffffff RBP: 00007ffc250fbfcc R08: 000000000000003d R09: 00007ffc251bb080 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000f4240 R13: 0000000000000002 R14: 00007ffc250fc020 R15: 00007ffc250fc010 </TASK> Allocated by task 5081: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:769 [inline] kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062 io_alloc_req_refill io_uring/io_uring.h:348 [inline] io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 33: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] kmem_cache_free+0xec/0x4e0 mm/slub.c:3809 io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737 io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967 process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293 worker_thread+0x669/0x1090 kernel/workqueue.c:2440 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff88801d1508c0 which belongs to the cache io_kiocb of size 216 The buggy address is located 48 bytes inside of 216-byte region [ffff88801d1508c0, ffff88801d150998) The buggy address belongs to the physical page: page:ffffea0000745400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d150 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff88801beb7780 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 5081, tgid 5079 (syz-executor378), ts 61182579448, free_ts 52418879084 prep_new_page mm/page_alloc.c:2549 [inline] get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324 __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __kmem_cache_alloc_bulk mm/slub.c:3951 [inline] kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026 __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062 io_alloc_req_refill io_uring/io_uring.h:348 [inline] io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407 __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1451 [inline] free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3482 __folio_put_small mm/swap.c:106 [inline] __folio_put+0xc5/0x140 mm/swap.c:129 folio_put include/linux/mm.h:1203 [inline] put_page include/linux/mm.h:1272 [inline] anon_pipe_buf_release+0x3fb/0x4c0 fs/pipe.c:138 pipe_buf_release include/linux/pipe_fs_i.h:183 [inline] pipe_read+0x614/0x1110 fs/pipe.c:324 call_read_iter include/linux/fs.h:1846 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7fa/0x930 fs/read_write.c:470 ksys_read+0x1ec/0x250 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88801d150780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801d150800: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc >ffff88801d150880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff88801d150900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801d150980: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [io_uring] KASAN: use-after-free Read in signalfd_cleanup 2023-01-12 22:40 ` [syzbot] [ext4?] [vfs?] KASAN: use-after-free Read in signalfd_cleanup syzbot @ 2023-01-13 2:12 ` Eric Biggers 2023-01-13 2:17 ` Jens Axboe 0 siblings, 1 reply; 4+ messages in thread From: Eric Biggers @ 2023-01-13 2:12 UTC (permalink / raw) To: Jens Axboe, Pavel Begunkov, io-uring Cc: syzbot, adilger.kernel, linux-ext4, linux-fsdevel, linux-kernel, llvm, nathan, ndesaulniers, syzkaller-bugs, trix, tytso, viro Over to the io_uring maintainers and list, based on the reproducer...: r0 = signalfd4(0xffffffffffffffff, &(0x7f00000000c0), 0x8, 0x0) r1 = syz_io_uring_setup(0x87, &(0x7f0000000180), &(0x7f0000ffc000/0x3000)=nil, &(0x7f00006d4000/0x1000)=nil, &(0x7f0000000000)=<r2=>0x0, &(0x7f0000000040)=<r3=>0x0) pipe(&(0x7f0000000080)={0xffffffffffffffff, <r4=>0xffffffffffffffff}) write$binfmt_misc(r4, &(0x7f0000000000)=ANY=[], 0xfffffecc) syz_io_uring_submit(r2, r3, &(0x7f0000002240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r0}, 0x0) io_uring_enter(r1, 0x450c, 0x0, 0x0, 0x0, 0x0) On Thu, Jan 12, 2023 at 02:40:39PM -0800, syzbot wrote: > syzbot has found a reproducer for the following issue on: > > HEAD commit: 0a093b2893c7 Add linux-next specific files for 20230112 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=10a992a1480000 > kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5 > dashboard link: https://syzkaller.appspot.com/bug?extid=8317cc9c082c19d576a0 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11f672ee480000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1357774a480000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/8111a570d6cb/disk-0a093b28.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/ecc135b7fc9a/vmlinux-0a093b28.xz > kernel image: https://storage.googleapis.com/syzbot-assets/ca8d73b446ea/bzImage-0a093b28.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+8317cc9c082c19d576a0@syzkaller.appspotmail.com > > ================================================================== > BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 > Read of size 8 at addr ffff88801d1508f0 by task syz-executor378/5077 > > CPU: 0 PID: 5077 Comm: syz-executor378 Not tainted 6.2.0-rc3-next-20230112-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 > print_address_description mm/kasan/report.c:306 [inline] > print_report+0x15e/0x45d mm/kasan/report.c:417 > kasan_report+0xc0/0xf0 mm/kasan/report.c:517 > __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 > __wake_up_common_lock+0xd4/0x140 kernel/sched/wait.c:138 > __wake_up kernel/sched/wait.c:160 [inline] > __wake_up_pollfree+0x1d/0x60 kernel/sched/wait.c:246 > wake_up_pollfree include/linux/wait.h:271 [inline] > signalfd_cleanup+0x46/0x60 fs/signalfd.c:38 > __cleanup_sighand kernel/fork.c:1688 [inline] > __cleanup_sighand+0x76/0xb0 kernel/fork.c:1685 > __exit_signal kernel/exit.c:209 [inline] > release_task+0xbfa/0x1870 kernel/exit.c:255 > wait_task_zombie kernel/exit.c:1198 [inline] > wait_consider_task+0x306d/0x3ce0 kernel/exit.c:1425 > do_wait_thread kernel/exit.c:1488 [inline] > do_wait+0x7cd/0xd90 kernel/exit.c:1605 > kernel_wait4+0x150/0x260 kernel/exit.c:1768 > __do_sys_wait4+0x13f/0x150 kernel/exit.c:1796 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7facd1d06656 > Code: 0f 1f 40 00 31 c9 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 49 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 90 48 83 ec 28 89 54 24 14 48 89 74 24 > RSP: 002b:00007ffc250fbf98 EFLAGS: 00000246 > ORIG_RAX: 000000000000003d > RAX: ffffffffffffffda RBX: 00007ffc250fc050 RCX: 00007facd1d06656 > RDX: 0000000040000001 RSI: 00007ffc250fbfcc RDI: 00000000ffffffff > RBP: 00007ffc250fbfcc R08: 000000000000003d R09: 00007ffc251bb080 > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000f4240 > R13: 0000000000000002 R14: 00007ffc250fc020 R15: 00007ffc250fc010 > </TASK> > > Allocated by task 5081: > kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 > kasan_set_track+0x25/0x30 mm/kasan/common.c:52 > __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:325 > kasan_slab_alloc include/linux/kasan.h:186 [inline] > slab_post_alloc_hook mm/slab.h:769 [inline] > kmem_cache_alloc_bulk+0x3aa/0x730 mm/slub.c:4033 > __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062 > io_alloc_req_refill io_uring/io_uring.h:348 [inline] > io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407 > __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > > Freed by task 33: > kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 > kasan_set_track+0x25/0x30 mm/kasan/common.c:52 > kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 > ____kasan_slab_free mm/kasan/common.c:236 [inline] > ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 > kasan_slab_free include/linux/kasan.h:162 [inline] > slab_free_hook mm/slub.c:1781 [inline] > slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 > slab_free mm/slub.c:3787 [inline] > kmem_cache_free+0xec/0x4e0 mm/slub.c:3809 > io_req_caches_free+0x1a9/0x1e6 io_uring/io_uring.c:2737 > io_ring_exit_work+0x2e7/0xc80 io_uring/io_uring.c:2967 > process_one_work+0x9bf/0x1750 kernel/workqueue.c:2293 > worker_thread+0x669/0x1090 kernel/workqueue.c:2440 > kthread+0x2e8/0x3a0 kernel/kthread.c:376 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 > > The buggy address belongs to the object at ffff88801d1508c0 > which belongs to the cache io_kiocb of size 216 > The buggy address is located 48 bytes inside of > 216-byte region [ffff88801d1508c0, ffff88801d150998) > > The buggy address belongs to the physical page: > page:ffffea0000745400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d150 > flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) > raw: 00fff00000000200 ffff88801beb7780 dead000000000122 0000000000000000 > raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > page_owner tracks the page as allocated > page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 5081, tgid 5079 (syz-executor378), ts 61182579448, free_ts 52418879084 > prep_new_page mm/page_alloc.c:2549 [inline] > get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324 > __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590 > alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281 > alloc_slab_page mm/slub.c:1851 [inline] > allocate_slab+0x25f/0x350 mm/slub.c:1998 > new_slab mm/slub.c:2051 [inline] > ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 > __kmem_cache_alloc_bulk mm/slub.c:3951 [inline] > kmem_cache_alloc_bulk+0x23d/0x730 mm/slub.c:4026 > __io_alloc_req_refill+0xcc/0x40b io_uring/io_uring.c:1062 > io_alloc_req_refill io_uring/io_uring.h:348 [inline] > io_submit_sqes.cold+0x7c/0xc2 io_uring/io_uring.c:2407 > __do_sys_io_uring_enter+0x9e4/0x2c10 io_uring/io_uring.c:3429 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > page last free stack trace: > reset_page_owner include/linux/page_owner.h:24 [inline] > free_pages_prepare mm/page_alloc.c:1451 [inline] > free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501 > free_unref_page_prepare mm/page_alloc.c:3387 [inline] > free_unref_page+0x1d/0x490 mm/page_alloc.c:3482 > __folio_put_small mm/swap.c:106 [inline] > __folio_put+0xc5/0x140 mm/swap.c:129 > folio_put include/linux/mm.h:1203 [inline] > put_page include/linux/mm.h:1272 [inline] > anon_pipe_buf_release+0x3fb/0x4c0 fs/pipe.c:138 > pipe_buf_release include/linux/pipe_fs_i.h:183 [inline] > pipe_read+0x614/0x1110 fs/pipe.c:324 > call_read_iter include/linux/fs.h:1846 [inline] > new_sync_read fs/read_write.c:389 [inline] > vfs_read+0x7fa/0x930 fs/read_write.c:470 > ksys_read+0x1ec/0x250 fs/read_write.c:613 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > > Memory state around the buggy address: > ffff88801d150780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88801d150800: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc > >ffff88801d150880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb > ^ > ffff88801d150900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88801d150980: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc > ================================================================== > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000651be505f218ce8b%40google.com. ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [io_uring] KASAN: use-after-free Read in signalfd_cleanup 2023-01-13 2:12 ` [io_uring] " Eric Biggers @ 2023-01-13 2:17 ` Jens Axboe 2023-01-13 2:26 ` Eric Biggers 0 siblings, 1 reply; 4+ messages in thread From: Jens Axboe @ 2023-01-13 2:17 UTC (permalink / raw) To: Eric Biggers, Pavel Begunkov, io-uring Cc: syzbot, adilger.kernel, linux-ext4, linux-fsdevel, linux-kernel, llvm, nathan, ndesaulniers, syzkaller-bugs, trix, tytso, viro On 1/12/23 7:12 PM, Eric Biggers wrote: > Over to the io_uring maintainers and list, based on the reproducer...: > > r0 = signalfd4(0xffffffffffffffff, &(0x7f00000000c0), 0x8, 0x0) > r1 = syz_io_uring_setup(0x87, &(0x7f0000000180), &(0x7f0000ffc000/0x3000)=nil, &(0x7f00006d4000/0x1000)=nil, &(0x7f0000000000)=<r2=>0x0, &(0x7f0000000040)=<r3=>0x0) > pipe(&(0x7f0000000080)={0xffffffffffffffff, <r4=>0xffffffffffffffff}) > write$binfmt_misc(r4, &(0x7f0000000000)=ANY=[], 0xfffffecc) > syz_io_uring_submit(r2, r3, &(0x7f0000002240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r0}, 0x0) > io_uring_enter(r1, 0x450c, 0x0, 0x0, 0x0, 0x0) This was a buggy patch in a branch, already updated and can be discarded. -- Jens Axboe ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [io_uring] KASAN: use-after-free Read in signalfd_cleanup 2023-01-13 2:17 ` Jens Axboe @ 2023-01-13 2:26 ` Eric Biggers 0 siblings, 0 replies; 4+ messages in thread From: Eric Biggers @ 2023-01-13 2:26 UTC (permalink / raw) To: Jens Axboe Cc: Pavel Begunkov, io-uring, syzbot, adilger.kernel, linux-ext4, linux-fsdevel, linux-kernel, llvm, nathan, ndesaulniers, syzkaller-bugs, trix, tytso, viro On Thu, Jan 12, 2023 at 07:17:25PM -0700, Jens Axboe wrote: > On 1/12/23 7:12 PM, Eric Biggers wrote: > > Over to the io_uring maintainers and list, based on the reproducer...: > > > > r0 = signalfd4(0xffffffffffffffff, &(0x7f00000000c0), 0x8, 0x0) > > r1 = syz_io_uring_setup(0x87, &(0x7f0000000180), &(0x7f0000ffc000/0x3000)=nil, &(0x7f00006d4000/0x1000)=nil, &(0x7f0000000000)=<r2=>0x0, &(0x7f0000000040)=<r3=>0x0) > > pipe(&(0x7f0000000080)={0xffffffffffffffff, <r4=>0xffffffffffffffff}) > > write$binfmt_misc(r4, &(0x7f0000000000)=ANY=[], 0xfffffecc) > > syz_io_uring_submit(r2, r3, &(0x7f0000002240)=@IORING_OP_POLL_ADD={0x6, 0x0, 0x0, @fd=r0}, 0x0) > > io_uring_enter(r1, 0x450c, 0x0, 0x0, 0x0, 0x0) > > This was a buggy patch in a branch, already updated and can be discarded. > Then let's do: #syz invalid ^ permalink raw reply [flat|nested] 4+ messages in thread
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2023-01-12 22:40 ` [syzbot] [ext4?] [vfs?] KASAN: use-after-free Read in signalfd_cleanup syzbot
2023-01-13 2:12 ` [io_uring] " Eric Biggers
2023-01-13 2:17 ` Jens Axboe
2023-01-13 2:26 ` Eric Biggers
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