On Fri, Jan 27, 2023 at 11:55 PM Sanan Hasanov <sanan.hasanov@xxxxxxxxxxxxxxx> wrote: > > Good day, dear maintainers, > > We found a bug using a modified kernel configuration file used by syzbot. > > We enhanced the coverage of the configuration file using our tool, klocalizer. > > Kernel Branch: 6.2.0-rc5-next-20230125 > Kernel config: https://drive.google.com/file/d/1qDN6q_k12wcgp6dt4jfF4hpk3Ix5FaKX/view?usp=sharing > Reproducer: https://drive.google.com/file/d/11bfgp5hzObE2om0k0bNfeSIEf_SciGY1/view?usp=sharing > > Thank you! > > Best regards, > Sanan Hasanov > > general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN > KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] > CPU: 4 PID: 27585 Comm: syz-executor.5 Not tainted 6.2.0-rc5-next-20230125 #1 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 > RIP: 0010:efivar_lock+0x4e/0xa0 > Code: a8 28 0f fc 45 85 e4 75 3f e8 ee 2c 0f fc 48 8b 1d b7 aa c5 05 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 39 48 83 7b 08 00 74 19 e8 c0 2c 0f fc 44 89 e0 5b > RSP: 0018:ffff88802549fca8 EFLAGS: 00010212 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003cb0000 > RDX: 0000000000000001 RSI: ffffffff85792a42 RDI: 0000000000000008 > RBP: ffff88802549fcb8 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 > R13: 0000000000000000 R14: ffffffff82595920 R15: 0000000000000000 > FS: 00007fafd9f83700(0000) GS:ffff88811a800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f9e23270d78 CR3: 00000000233bb000 CR4: 0000000000350ee0 > Call Trace: > <TASK> > efivar_entry_iter+0x29/0x150 > efivarfs_kill_sb+0x2f/0x40 > deactivate_locked_super+0xa6/0x190 > vfs_get_super+0x235/0x2b0 > get_tree_single+0x2b/0x40 > efivarfs_get_tree+0x21/0x30 > vfs_get_tree+0x97/0x370 > __do_sys_fsconfig+0x981/0xd20 > __x64_sys_fsconfig+0xc1/0x150 > do_syscall_64+0x3f/0x90 > entry_SYSCALL_64_after_hwframe+0x72/0xdc > RIP: 0033:0x7fafd8e8edcd > Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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:00007fafd9f82bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af > RAX: ffffffffffffffda RBX: 00007fafd8fbbf80 RCX: 00007fafd8e8edcd > RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004 > RBP: 00007fafd8efc59c R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007fff23221a7f R14: 00007fff23221c20 R15: 00007fafd9f82d80 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:efivar_lock+0x4e/0xa0 > Code: a8 28 0f fc 45 85 e4 75 3f e8 ee 2c 0f fc 48 8b 1d b7 aa c5 05 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 39 48 83 7b 08 00 74 19 e8 c0 2c 0f fc 44 89 e0 5b > RSP: 0018:ffff88802549fca8 EFLAGS: 00010212 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003cb0000 > RDX: 0000000000000001 RSI: ffffffff85792a42 RDI: 0000000000000008 > RBP: ffff88802549fcb8 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 > R13: 0000000000000000 R14: ffffffff82595920 R15: 0000000000000000 > FS: 00007fafd9f83700(0000) GS:ffff88811a800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f9e23270d78 CR3: 00000000233bb000 CR4: 0000000000350ee0 > ---------------- > Code disassembly (best guess), 1 bytes skipped: > 0: 28 0f sub %cl,(%rdi) > 2: fc cld > 3: 45 85 e4 test %r12d,%r12d > 6: 75 3f jne 0x47 > 8: e8 ee 2c 0f fc call 0xfc0f2cfb > d: 48 8b 1d b7 aa c5 05 mov 0x5c5aab7(%rip),%rbx # 0x5c5aacb > 14: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > 1b: fc ff df > 1e: 48 8d 7b 08 lea 0x8(%rbx),%rdi > 22: 48 89 fa mov %rdi,%rdx > 25: 48 c1 ea 03 shr $0x3,%rdx > * 29: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction > 2d: 75 39 jne 0x68 > 2f: 48 83 7b 08 00 cmpq $0x0,0x8(%rbx) > 34: 74 19 je 0x4f > 36: e8 c0 2c 0f fc call 0xfc0f2cfb > 3b: 44 89 e0 mov %r12d,%eax > 3e: 5b pop %rbx Hi, Should be fixed by https://lore.kernel.org/linux-efi/20230126112129.4602-1-johan+linaro@xxxxxxxxxx/ (squashed into c3fd71b428b8fa on Ard's tree). Also in linux-next.git 301de9a205535737. Can you see if that fixes your crash? -- Pedro
