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Date: Mon, 26 Feb 2024 01:38:01 -0800 From: syzbot <syzbot+a2e2735f09ebb9d95bd1@...kaller.appspotmail.com> To: yanjun.zhu@...ux.dev Cc: yanjun.zhu@...ux.dev, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [rdma?] KASAN: slab-use-after-free Read in rdma_resolve_route > #syz test: https://github.com/zhuyj/linux.git linux_6.8_rc4_rdma_cm This crash does not have a reproducer. I cannot test it. > > 在 2024/2/23 18:51, syzbot 写道: >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: 2c3b09aac00d Add linux-next specific files for 20240214 >> git tree: linux-next >> console output: https://syzkaller.appspot.com/x/log.txt?x=1793a064180000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=176d2dcbf8ba7017 >> dashboard link: https://syzkaller.appspot.com/bug?extid=a2e2735f09ebb9d95bd1 >> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 >> >> Unfortunately, I don't have any reproducer for this issue yet. >> >> Downloadable assets: >> disk image: https://storage.googleapis.com/syzbot-assets/ac51042b61c6/disk-2c3b09aa.raw.xz >> vmlinux: https://storage.googleapis.com/syzbot-assets/012344301c35/vmlinux-2c3b09aa.xz >> kernel image: https://storage.googleapis.com/syzbot-assets/cba3c3e5cd7c/bzImage-2c3b09aa.xz >> >> IMPORTANT: if you fix the issue, please add the following tag to the commit: >> Reported-by: syzbot+a2e2735f09ebb9d95bd1@...kaller.appspotmail.com >> >> ================================================================== >> BUG: KASAN: slab-use-after-free in compare_netdev_and_ip drivers/infiniband/core/cma.c:473 [inline] >> BUG: KASAN: slab-use-after-free in cma_add_id_to_tree drivers/infiniband/core/cma.c:513 [inline] >> BUG: KASAN: slab-use-after-free in rdma_resolve_route+0x23f7/0x3150 drivers/infiniband/core/cma.c:3379 >> Read of size 4 at addr ffff88808dcf6184 by task syz-executor.4/11929 >> >> CPU: 1 PID: 11929 Comm: syz-executor.4 Not tainted 6.8.0-rc4-next-20240214-syzkaller #0 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 >> Call Trace: >> <TASK> >> __dump_stack lib/dump_stack.c:88 [inline] >> dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 >> 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 >> compare_netdev_and_ip drivers/infiniband/core/cma.c:473 [inline] >> cma_add_id_to_tree drivers/infiniband/core/cma.c:513 [inline] >> rdma_resolve_route+0x23f7/0x3150 drivers/infiniband/core/cma.c:3379 >> ucma_resolve_route+0x1ba/0x330 drivers/infiniband/core/ucma.c:745 >> ucma_write+0x2df/0x430 drivers/infiniband/core/ucma.c:1743 >> vfs_write+0x2a4/0xcb0 fs/read_write.c:588 >> ksys_write+0x1a0/0x2c0 fs/read_write.c:643 >> do_syscall_64+0xfb/0x240 >> entry_SYSCALL_64_after_hwframe+0x6d/0x75 >> RIP: 0033:0x7f4eae47dda9 >> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 >> RSP: 002b:00007f4eaf2cd0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 >> RAX: ffffffffffffffda RBX: 00007f4eae5abf80 RCX: 00007f4eae47dda9 >> RDX: 0000000000000010 RSI: 0000000020000440 RDI: 0000000000000003 >> RBP: 00007f4eae4ca47a R08: 0000000000000000 R09: 0000000000000000 >> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 >> R13: 000000000000000b R14: 00007f4eae5abf80 R15: 00007fff93bb3dc8 >> </TASK> >> >> Allocated by task 11919: >> kasan_save_stack mm/kasan/common.c:47 [inline] >> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 >> poison_kmalloc_redzone mm/kasan/common.c:370 [inline] >> __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 >> kasan_kmalloc include/linux/kasan.h:211 [inline] >> kmalloc_trace+0x1d9/0x360 mm/slub.c:4013 >> kmalloc include/linux/slab.h:590 [inline] >> kzalloc include/linux/slab.h:711 [inline] >> __rdma_create_id+0x65/0x590 drivers/infiniband/core/cma.c:993 >> rdma_create_user_id+0x83/0xc0 drivers/infiniband/core/cma.c:1049 >> ucma_create_id+0x2d0/0x500 drivers/infiniband/core/ucma.c:463 >> ucma_write+0x2df/0x430 drivers/infiniband/core/ucma.c:1743 >> vfs_write+0x2a4/0xcb0 fs/read_write.c:588 >> ksys_write+0x1a0/0x2c0 fs/read_write.c:643 >> do_syscall_64+0xfb/0x240 >> entry_SYSCALL_64_after_hwframe+0x6d/0x75 >> >> Freed by task 11915: >> 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:586 >> poison_slab_object+0xa6/0xe0 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:2122 [inline] >> slab_free mm/slub.c:4296 [inline] >> kfree+0x14a/0x380 mm/slub.c:4406 >> ucma_close_id drivers/infiniband/core/ucma.c:186 [inline] >> ucma_destroy_private_ctx+0x14e/0xc10 drivers/infiniband/core/ucma.c:578 >> ucma_close+0xfc/0x170 drivers/infiniband/core/ucma.c:1808 >> __fput+0x429/0x8a0 fs/file_table.c:411 >> __do_sys_close fs/open.c:1557 [inline] >> __se_sys_close fs/open.c:1542 [inline] >> __x64_sys_close+0x7f/0x110 fs/open.c:1542 >> do_syscall_64+0xfb/0x240 >> entry_SYSCALL_64_after_hwframe+0x6d/0x75 >> >> The buggy address belongs to the object at ffff88808dcf6000 >> which belongs to the cache kmalloc-2k of size 2048 >> The buggy address is located 388 bytes inside of >> freed 2048-byte region [ffff88808dcf6000, ffff88808dcf6800) >> >> The buggy address belongs to the physical page: >> page:ffffea0002373c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8dcf0 >> head:ffffea0002373c00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 >> flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff) >> page_type: 0xffffffff() >> raw: 00fff80000000840 ffff888014c42000 dead000000000100 dead000000000122 >> raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 >> page dumped because: kasan: bad access detected >> page_owner tracks the page as allocated >> page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5149, tgid 5149 (kworker/1:4), ts 205905084555, free_ts 0 >> set_page_owner include/linux/page_owner.h:31 [inline] >> post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 >> prep_new_page mm/page_alloc.c:1540 [inline] >> get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 >> __alloc_pages+0x256/0x6a0 mm/page_alloc.c:4567 >> __alloc_pages_node include/linux/gfp.h:238 [inline] >> alloc_pages_node include/linux/gfp.h:261 [inline] >> alloc_slab_page+0x5f/0x160 mm/slub.c:2191 >> allocate_slab mm/slub.c:2354 [inline] >> new_slab+0x84/0x2f0 mm/slub.c:2407 >> ___slab_alloc+0xc73/0x1260 mm/slub.c:3541 >> __slab_alloc mm/slub.c:3626 [inline] >> __slab_alloc_node mm/slub.c:3679 [inline] >> slab_alloc_node mm/slub.c:3851 [inline] >> __do_kmalloc_node mm/slub.c:3981 [inline] >> __kmalloc_node_track_caller+0x2d4/0x4e0 mm/slub.c:4002 >> kmalloc_reserve+0xf3/0x260 net/core/skbuff.c:582 >> __alloc_skb+0x1b1/0x420 net/core/skbuff.c:651 >> alloc_skb include/linux/skbuff.h:1296 [inline] >> alloc_skb_with_frags+0xc3/0x780 net/core/skbuff.c:6394 >> sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2794 >> sock_alloc_send_skb include/net/sock.h:1855 [inline] >> mld_newpack+0x1c3/0xa90 net/ipv6/mcast.c:1746 >> add_grhead net/ipv6/mcast.c:1849 [inline] >> add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1987 >> mld_send_cr net/ipv6/mcast.c:2113 [inline] >> mld_ifc_work+0x6bf/0xb30 net/ipv6/mcast.c:2650 >> process_one_work kernel/workqueue.c:3146 [inline] >> process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3226 >> worker_thread+0x86d/0xd70 kernel/workqueue.c:3307 >> page_owner free stack trace missing >> >> Memory state around the buggy address: >> ffff88808dcf6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >> ffff88808dcf6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >>> ffff88808dcf6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >> ^ >> ffff88808dcf6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >> ffff88808dcf6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >> ================================================================== >> >> >> --- >> This report is generated by a bot. It may contain errors. >> See https://goo.gl/tpsmEJ for more information about syzbot. >> syzbot engineers can be reached at syzkaller@...glegroups.com. >> >> syzbot will keep track of this issue. See: >> https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >> >> If the report is already addressed, let syzbot know by replying with: >> #syz fix: exact-commit-title >> >> 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 >
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