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9/4/2024 8:32 AM, Eric Dumazet wrote: > On Wed, Sep 4, 2024 at 5:13 PM syzbot > wrote: >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: fbdaffe41adc Merge branch 'am-qt2025-phy-rust' >> git tree: net-next >> console+strace: https://urldefense.com/v3/__https://syzkaller.appspot.com/x/log.txt?x=13d7c44d980000__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCinyPp6_w$ >> kernel config: https://urldefense.com/v3/__https://syzkaller.appspot.com/x/.config?x=996585887acdadb3__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChXq35SIA$ >> dashboard link: https://urldefense.com/v3/__https://syzkaller.appspot.com/bug?extid=8811381d455e3e9ec788__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCgeHsuB4Q$ >> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 >> syz repro: https://urldefense.com/v3/__https://syzkaller.appspot.com/x/repro.syz?x=14b395db980000__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChfSXV14A$ >> C reproducer: https://urldefense.com/v3/__https://syzkaller.appspot.com/x/repro.c?x=16d3fc53980000__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChGWZhDug$ >> >> Downloadable assets: >> disk image: https://urldefense.com/v3/__https://storage.googleapis.com/syzbot-assets/feaa1b13b490/disk-fbdaffe4.raw.xz__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChjbj6XGw$ >> vmlinux: https://urldefense.com/v3/__https://storage.googleapis.com/syzbot-assets/8e5dccd0377a/vmlinux-fbdaffe4.xz__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChlarTUfA$ >> kernel image: https://urldefense.com/v3/__https://storage.googleapis.com/syzbot-assets/75151f74f4c9/bzImage-fbdaffe4.xz__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCgl9hRVww$ >> >> Bisection is inconclusive: the first bad commit could be any of: >> >> 06ab21c3cb6e dt-bindings: net: mediatek,net: add top-level constraints >> 70d16e13368c dt-bindings: net: renesas,etheravb: add top-level constraints >> >> bisection log: https://urldefense.com/v3/__https://syzkaller.appspot.com/x/bisect.txt?x=11d42e63980000__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCjDvB9Flg$ >> >> IMPORTANT: if you fix the issue, please add the following tag to the commit: >> Reported-by: syzbot+8811381d455e3e9ec788@syzkaller.appspotmail.com >> >> ================================================================== >> BUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959 >> Read of size 4 at addr ffff8880326abcc4 by task syz-executor178/5235 >> >> CPU: 0 UID: 0 PID: 5235 Comm: syz-executor178 Not tainted 6.11.0-rc5-syzkaller-00742-gfbdaffe41adc #0 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 >> Call Trace: >> >> __dump_stack lib/dump_stack.c:93 [inline] >> dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 >> print_address_description mm/kasan/report.c:377 [inline] >> print_report+0x169/0x550 mm/kasan/report.c:488 >> kasan_report+0x143/0x180 mm/kasan/report.c:601 >> unix_stream_read_actor+0xa6/0xb0 net/unix/af_unix.c:2959 >> unix_stream_recv_urg+0x1df/0x320 net/unix/af_unix.c:2640 >> unix_stream_read_generic+0x2456/0x2520 net/unix/af_unix.c:2778 >> unix_stream_recvmsg+0x22b/0x2c0 net/unix/af_unix.c:2996 >> sock_recvmsg_nosec net/socket.c:1046 [inline] >> sock_recvmsg+0x22f/0x280 net/socket.c:1068 >> ____sys_recvmsg+0x1db/0x470 net/socket.c:2816 >> ___sys_recvmsg net/socket.c:2858 [inline] >> __sys_recvmsg+0x2f0/0x3e0 net/socket.c:2888 >> do_syscall_x64 arch/x86/entry/common.c:52 [inline] >> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 >> entry_SYSCALL_64_after_hwframe+0x77/0x7f >> RIP: 0033:0x7f5360d6b4e9 >> Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 >> RSP: 002b:00007fff29b3a458 EFLAGS: 00000246 ORIG_RAX: 000000000000002f >> RAX: ffffffffffffffda RBX: 00007fff29b3a638 RCX: 00007f5360d6b4e9 >> RDX: 0000000000002001 RSI: 0000000020000640 RDI: 0000000000000003 >> RBP: 00007f5360dde610 R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 >> R13: 00007fff29b3a628 R14: 0000000000000001 R15: 0000000000000001 >> >> >> Allocated by task 5235: >> kasan_save_stack mm/kasan/common.c:47 [inline] >> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 >> unpoison_slab_object mm/kasan/common.c:312 [inline] >> __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 >> kasan_slab_alloc include/linux/kasan.h:201 [inline] >> slab_post_alloc_hook mm/slub.c:3988 [inline] >> slab_alloc_node mm/slub.c:4037 [inline] >> kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4080 >> __alloc_skb+0x1c3/0x440 net/core/skbuff.c:667 >> alloc_skb include/linux/skbuff.h:1320 [inline] >> alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6528 >> sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2815 >> sock_alloc_send_skb include/net/sock.h:1778 [inline] >> queue_oob+0x108/0x680 net/unix/af_unix.c:2198 >> unix_stream_sendmsg+0xd24/0xf80 net/unix/af_unix.c:2351 >> sock_sendmsg_nosec net/socket.c:730 [inline] >> __sock_sendmsg+0x221/0x270 net/socket.c:745 >> ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597 >> ___sys_sendmsg net/socket.c:2651 [inline] >> __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680 >> do_syscall_x64 arch/x86/entry/common.c:52 [inline] >> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 >> entry_SYSCALL_64_after_hwframe+0x77/0x7f >> >> Freed by task 5235: >> kasan_save_stack mm/kasan/common.c:47 [inline] >> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 >> kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 >> poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 >> __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 >> kasan_slab_free include/linux/kasan.h:184 [inline] >> slab_free_hook mm/slub.c:2252 [inline] >> slab_free mm/slub.c:4473 [inline] >> kmem_cache_free+0x145/0x350 mm/slub.c:4548 >> unix_stream_read_generic+0x1ef6/0x2520 net/unix/af_unix.c:2917 >> unix_stream_recvmsg+0x22b/0x2c0 net/unix/af_unix.c:2996 >> sock_recvmsg_nosec net/socket.c:1046 [inline] >> sock_recvmsg+0x22f/0x280 net/socket.c:1068 >> __sys_recvfrom+0x256/0x3e0 net/socket.c:2255 >> __do_sys_recvfrom net/socket.c:2273 [inline] >> __se_sys_recvfrom net/socket.c:2269 [inline] >> __x64_sys_recvfrom+0xde/0x100 net/socket.c:2269 >> do_syscall_x64 arch/x86/entry/common.c:52 [inline] >> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 >> entry_SYSCALL_64_after_hwframe+0x77/0x7f >> >> The buggy address belongs to the object at ffff8880326abc80 >> which belongs to the cache skbuff_head_cache of size 240 >> The buggy address is located 68 bytes inside of >> freed 240-byte region [ffff8880326abc80, ffff8880326abd70) >> >> The buggy address belongs to the physical page: >> page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x326ab >> ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) >> page_type: 0xfdffffff(slab) >> raw: 00fff00000000000 ffff88801eaee780 ffffea0000b7dc80 dead000000000003 >> raw: 0000000000000000 00000000800c000c 00000001fdffffff 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 4686, tgid 4686 (udevadm), ts 32357469485, free_ts 28829011109 >> set_page_owner include/linux/page_owner.h:32 [inline] >> post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 >> prep_new_page mm/page_alloc.c:1501 [inline] >> get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 >> __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 >> __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] >> alloc_pages_node_noprof include/linux/gfp.h:296 [inline] >> alloc_slab_page+0x5f/0x120 mm/slub.c:2321 >> allocate_slab+0x5a/0x2f0 mm/slub.c:2484 >> new_slab mm/slub.c:2537 [inline] >> ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 >> __slab_alloc+0x58/0xa0 mm/slub.c:3813 >> __slab_alloc_node mm/slub.c:3866 [inline] >> slab_alloc_node mm/slub.c:4025 [inline] >> kmem_cache_alloc_node_noprof+0x1fe/0x320 mm/slub.c:4080 >> __alloc_skb+0x1c3/0x440 net/core/skbuff.c:667 >> alloc_skb include/linux/skbuff.h:1320 [inline] >> alloc_uevent_skb+0x74/0x230 lib/kobject_uevent.c:289 >> uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline] >> kobject_uevent_net_broadcast+0x2fd/0x580 lib/kobject_uevent.c:410 >> kobject_uevent_env+0x57d/0x8e0 lib/kobject_uevent.c:608 >> kobject_synth_uevent+0x4ef/0xae0 lib/kobject_uevent.c:207 >> uevent_store+0x4b/0x70 drivers/base/bus.c:633 >> kernfs_fop_write_iter+0x3a1/0x500 fs/kernfs/file.c:334 >> new_sync_write fs/read_write.c:497 [inline] >> vfs_write+0xa72/0xc90 fs/read_write.c:590 >> page last free pid 1 tgid 1 stack trace: >> reset_page_owner include/linux/page_owner.h:25 [inline] >> free_pages_prepare mm/page_alloc.c:1094 [inline] >> free_unref_page+0xd22/0xea0 mm/page_alloc.c:2612 >> kasan_depopulate_vmalloc_pte+0x74/0x90 mm/kasan/shadow.c:408 >> apply_to_pte_range mm/memory.c:2797 [inline] >> apply_to_pmd_range mm/memory.c:2841 [inline] >> apply_to_pud_range mm/memory.c:2877 [inline] >> apply_to_p4d_range mm/memory.c:2913 [inline] >> __apply_to_page_range+0x8a8/0xe50 mm/memory.c:2947 >> kasan_release_vmalloc+0x9a/0xb0 mm/kasan/shadow.c:525 >> purge_vmap_node+0x3e3/0x770 mm/vmalloc.c:2208 >> __purge_vmap_area_lazy+0x708/0xae0 mm/vmalloc.c:2290 >> _vm_unmap_aliases+0x79d/0x840 mm/vmalloc.c:2885 >> change_page_attr_set_clr+0x2fe/0xdb0 arch/x86/mm/pat/set_memory.c:1881 >> change_page_attr_set arch/x86/mm/pat/set_memory.c:1922 [inline] >> set_memory_nx+0xf2/0x130 arch/x86/mm/pat/set_memory.c:2110 >> free_init_pages arch/x86/mm/init.c:924 [inline] >> free_kernel_image_pages arch/x86/mm/init.c:943 [inline] >> free_initmem+0x79/0x110 arch/x86/mm/init.c:970 >> kernel_init+0x31/0x2b0 init/main.c:1476 >> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 >> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 >> >> Memory state around the buggy address: >> ffff8880326abb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >> ffff8880326abc00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc >>> ffff8880326abc80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >> ^ >> ffff8880326abd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc >> ffff8880326abd80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >> ================================================================== >> >> >> --- >> This report is generated by a bot. It may contain errors. >> See https://urldefense.com/v3/__https://goo.gl/tpsmEJ__;!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCj0yiM5oA$ for more information about syzbot. >> syzbot engineers can be reached at syzkaller@googlegroups.com. >> >> syzbot will keep track of this issue. See: >> https://urldefense.com/v3/__https://goo.gl/tpsmEJ*status__;Iw!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmCglGrElYg$ for how to communicate with syzbot. >> For information about bisection process see: https://urldefense.com/v3/__https://goo.gl/tpsmEJ*bisection__;Iw!!ACWV5N9M2RV99hQ!O_wYwGadsms5089A9E28Dxx6WaVGOgSJ31BkCSFGtWTEPW52si4mQ-gN_xDf6oRUivpWe5nrmChS6eLfFw$ >> >> If the report is already addressed, let syzbot know by replying with: >> #syz fix: exact-commit-title >> >> If you want syzbot to run the reproducer, reply with: >> #syz test: git://repo/address.git branch-or-commit-hash >> If you attach or paste a git patch, syzbot will apply it before testing. >> >> If you want to overwrite report's subsystems, reply with: >> #syz set subsystems: new-subsystem >> (See the list of subsystem names on the web dashboard) >> >> If the report is a duplicate of another one, reply with: >> #syz dup: exact-subject-of-another-report >> >> If you want to undo deduplication, reply with: >> #syz undup > > Another af_unix OOB issue. > > Rao can you take a look ? > > Thanks. Sure I will take a look. Shoaib