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Date: Tue, 7 May 2024 14:32:25 +0800 From: Sam Sun <samsun1006219@...il.com> To: linux-kernel@...r.kernel.org, tglx@...utronix.de, akpm@...ux-foundation.org Cc: syzkaller-bugs@...glegroups.com, xrivendell7@...il.com Subject: [Linux kernel bug] general protection fault in alloc_object Dear developers and maintainers, We encountered a general protection fault in function alloc_object. It was tested against the latest upstream linux (tag 6.9-rc7). C repro and kernel config are attached to this email. Kernel crash log is listed below. ``` general protection fault, probably for non-canonical address 0xdffffc0040000001: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x0000000200000008-0x000000020000000f] CPU: 1 PID: 8107 Comm: systemd-sysctl Not tainted 6.9.0-rc6 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:__hlist_del include/linux/list.h:990 [inline] RIP: 0010:hlist_del include/linux/list.h:1002 [inline] RIP: 0010:__alloc_object lib/debugobjects.c:213 [inline] RIP: 0010:alloc_object+0x124/0x6c0 lib/debugobjects.c:226 Code: 3c 08 00 74 08 4c 89 f7 e8 69 41 58 fd 49 89 2e 48 85 ed 74 27 48 83 c5 08 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 ef e8 3e 41 58 fd 4c 89 75 00 49 be 00 00 RSP: 0018:ffffc900027ff510 EFLAGS: 00010002 RAX: 0000000040000001 RBX: ffff88802bb21e38 RCX: dffffc0000000000 RDX: ffffffff8b6de400 RSI: ffffffff8bcdd080 RDI: ffffffff8bcdd040 RBP: 0000000200000009 R08: 0000000000000003 R09: fffff520004ffe90 R10: dffffc0000000000 R11: ffffffff81746170 R12: 1ffff110057643c7 R13: ffff88802bb21e40 R14: ffff8880be43a1e0 R15: 1ffff110057643c8 FS: 0000000000000000(0000) GS:ffff8880be400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff335b18298 CR3: 000000006660c000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> lookup_object_or_alloc lib/debugobjects.c:587 [inline] debug_object_activate+0x23f/0x510 lib/debugobjects.c:710 debug_rcu_head_queue kernel/rcu/rcu.h:227 [inline] __call_rcu_common kernel/rcu/tree.c:2719 [inline] call_rcu+0x97/0xa30 kernel/rcu/tree.c:2838 remove_vma mm/mmap.c:148 [inline] remove_mt mm/mmap.c:2289 [inline] do_vmi_align_munmap+0x157e/0x1900 mm/mmap.c:2632 do_vmi_munmap+0x24c/0x2d0 mm/mmap.c:2696 mmap_region+0x866/0x1fb0 mm/mmap.c:2747 do_mmap+0x7d4/0xe60 mm/mmap.c:1385 vm_mmap_pgoff+0x1a3/0x400 mm/util.c:573 ksys_mmap_pgoff+0x4fb/0x6d0 mm/mmap.c:1431 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xe4/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x67/0x6f RIP: 0033:0x7ff335b9be82 Code: eb aa 66 0f 1f 44 00 00 41 f7 c1 ff 0f 00 00 75 27 55 48 89 fd 53 89 cb 48 85 ff 74 33 41 89 da 48 89 ef b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 56 5b 5d c3 0f 1f 00 c7 05 ae 02 01 00 16 00 RSP: 002b:00007ffc44458f18 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007ff335b9be82 RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007ff335b16000 RBP: 00007ff335b16000 R08: 0000000000000003 R09: 0000000000008000 R10: 0000000000000812 R11: 0000000000000206 R12: 00007ff335b79460 R13: 00007ffc44458f30 R14: 00007ffc44458fc0 R15: 00007ffc444592c0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__hlist_del include/linux/list.h:990 [inline] RIP: 0010:hlist_del include/linux/list.h:1002 [inline] RIP: 0010:__alloc_object lib/debugobjects.c:213 [inline] RIP: 0010:alloc_object+0x124/0x6c0 lib/debugobjects.c:226 Code: 3c 08 00 74 08 4c 89 f7 e8 69 41 58 fd 49 89 2e 48 85 ed 74 27 48 83 c5 08 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 ef e8 3e 41 58 fd 4c 89 75 00 49 be 00 00 RSP: 0018:ffffc900027ff510 EFLAGS: 00010002 RAX: 0000000040000001 RBX: ffff88802bb21e38 RCX: dffffc0000000000 RDX: ffffffff8b6de400 RSI: ffffffff8bcdd080 RDI: ffffffff8bcdd040 RBP: 0000000200000009 R08: 0000000000000003 R09: fffff520004ffe90 R10: dffffc0000000000 R11: ffffffff81746170 R12: 1ffff110057643c7 R13: ffff88802bb21e40 R14: ffff8880be43a1e0 R15: 1ffff110057643c8 FS: 0000000000000000(0000) GS:ffff8880be400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff335b18298 CR3: 000000006660c000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 ---------------- Code disassembly (best guess): 0: 3c 08 cmp $0x8,%al 2: 00 74 08 4c add %dh,0x4c(%rax,%rcx,1) 6: 89 f7 mov %esi,%edi 8: e8 69 41 58 fd callq 0xfd584176 d: 49 89 2e mov %rbp,(%r14) 10: 48 85 ed test %rbp,%rbp 13: 74 27 je 0x3c 15: 48 83 c5 08 add $0x8,%rbp 19: 48 89 e8 mov %rbp,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 ef mov %rbp,%rdi 33: e8 3e 41 58 fd callq 0xfd584176 38: 4c 89 75 00 mov %r14,0x0(%rbp) 3c: 49 rex.WB 3d: be .byte 0xbe ``` If you have any questions, please contact us. Reported by Yue Sun <samsun1006219@...il.com> Reported by xingwei lee <xrivendell7@...il.com> Best Regards, Yue Download attachment "config" of type "application/octet-stream" (247919 bytes) View attachment "alloc_object.c" of type "text/x-csrc" (42449 bytes)
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