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9/4/2024 10:32 AM, Shoaib Rao wrote: > > On 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 > Hi All, I am not able to reproduce the issue. I have run the C program at least 100 times in a loop. In the I do get an EFAULT, not sure if that is intentional or not but no panic. Should I be doing something differently? The kernel version I am using is v6.11-rc6-70-gc763c4339688. Later I can try with the exact version. [rshoaib@turbo-2 debug_pnic]$ gcc cause_panic.c -o panic_sys [rshoaib@turbo-2 debug_pnic]$ strace -f ./panic_sys execve("./panic_sys", ["./panic_sys"], 0x7ffe7d271d38 /* 63 vars */) = 0 brk(NULL)                               = 0x18104000 arch_prctl(0x3001 /* ARCH_??? */, 0x7ffe134f7880) = -1 EINVAL (Invalid argument) access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory) openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=94859, ...}) = 0 mmap(NULL, 94859, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7feb7dd0f000 close(3)                                = 0 openat(AT_FDCWD, "/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200\251\3\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=2164792, ...}) = 0 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7feb7dd0d000 lseek(3, 808, SEEK_SET)                 = 808 read(3, "\4\0\0\0\20\0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0", 32) = 32 mmap(NULL, 4020448, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7feb7d728000 mprotect(0x7feb7d8f5000, 2093056, PROT_NONE) = 0 mmap(0x7feb7daf4000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1cc000) = 0x7feb7daf4000 mmap(0x7feb7dafa000, 14560, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7feb7dafa000 close(3)                                = 0 arch_prctl(ARCH_SET_FS, 0x7feb7dd0e500) = 0 mprotect(0x7feb7daf4000, 16384, PROT_READ) = 0 mprotect(0x600000, 4096, PROT_READ)     = 0 mprotect(0x7feb7dd2d000, 4096, PROT_READ) = 0 munmap(0x7feb7dd0f000, 94859)           = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 write(1, "executing program\n", 18executing program )     = 18 socketpair(AF_UNIX, SOCK_STREAM, 0, [3, 4]) = 0 sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\333", iov_len=1}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_OOB|MSG_DONTWAIT) = 1 recvmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=NULL, msg_iovlen=0, msg_controllen=0, msg_flags=MSG_OOB}, MSG_OOB|MSG_WAITFORONE) = 1 sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\21", iov_len=1}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_OOB|MSG_NOSIGNAL|MSG_MORE) = 1 recvfrom(3, "\21", 125, MSG_DONTROUTE|MSG_TRUNC, NULL, NULL) = 1 recvmsg(3, {msg_namelen=0}, MSG_OOB|MSG_ERRQUEUE) = -1 EFAULT (Bad address)     <====== exit_group(0)                           = ? +++ exited with 0 +++ Regards, Shoaib