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Date: Mon, 13 May 2024 10:05:18 +0800 From: Sam Sun <samsun1006219@...il.com> To: linux-kernel@...r.kernel.org, gfs2@...ts.linux.dev Cc: syzkaller-bugs@...glegroups.com, xrivendell7@...il.com, agruenba@...hat.com Subject: [Linux kernel bug] general protection fault in gfs2_unstuffer_folio Dear developers and maintainers, We encountered a general protection fault in function gfs2_unstuffer_folio. It was tested against the latest upstream linux. C repro and kernel config are attached to this email. Kernel crash log is listed below. ``` general protection fault, probably for non-canonical address 0x80ff888064f0e190: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 1 PID: 8099 Comm: syz-executor163 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:memcpy_orig+0x64/0x120 arch/x86/lib/memcpy_64.S:94 Code: 57 10 4c 89 5f 18 48 8d 7f 20 73 d4 83 c2 20 eb 4c 48 01 d6 48 01 d7 48 83 ea 20 66 2e 0f 1f 84 00 00 00 00 00 90 48 83 ea 20 <4c> 8b 46 f8 4c 8b 4e f0 4c 8b 56 e8 4c 8b 5e e0 48 8d 76 e0 4c 89 RSP: 0018:ffffc9000273f5a0 EFLAGS: 00010282 RAX: ffff888064108000 RBX: ffff88807a48eea8 RCX: dffffc0000000000 RDX: 8100000000000070 RSI: 80ff888064f0e198 RDI: 80ff8880641080b0 RBP: ffff888064108000 R08: ffffffff83beadf4 R09: 1ffffd4000320840 R10: dffffc0000000000 R11: fffff94000320841 R12: 1ffffd4000320840 R13: ffffea0001904200 R14: 81000000000000b0 R15: 1ffffd4000320841 FS: 0000000000000000(0000) GS:ffff8880be400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555b742d7000 CR3: 0000000066974000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> gfs2_unstuffer_folio+0x147/0x900 fs/gfs2/bmap.c:63 __gfs2_unstuff_inode fs/gfs2/bmap.c:119 [inline] gfs2_unstuff_dinode+0x3d4/0xb50 fs/gfs2/bmap.c:166 gfs2_adjust_quota+0x28b/0x8f0 fs/gfs2/quota.c:879 do_sync+0x83c/0xea0 fs/gfs2/quota.c:990 gfs2_quota_sync+0x41e/0x5f0 fs/gfs2/quota.c:1370 gfs2_sync_fs+0x4d/0xb0 fs/gfs2/super.c:669 sync_filesystem+0xed/0x230 fs/sync.c:56 generic_shutdown_super+0x72/0x2d0 fs/super.c:620 kill_block_super+0x44/0x90 fs/super.c:1675 deactivate_locked_super+0xcb/0x120 fs/super.c:472 cleanup_mnt+0x3e5/0x470 fs/namespace.c:1267 task_work_run+0x23b/0x300 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa2e/0x26a0 kernel/exit.c:878 do_group_exit+0x201/0x2b0 kernel/exit.c:1027 __do_sys_exit_group kernel/exit.c:1038 [inline] __se_sys_exit_group kernel/exit.c:1036 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036 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: 0033:0x7f9bf50e33e6 Code: Unable to access opcode bytes at 0x7f9bf50e33bc. RSP: 002b:00007ffc059a4038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f9bf5175210 RCX: 00007f9bf50e33e6 RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 RBP: 0000000000000001 R08: 00000000000000e7 R09: ffffffffffffffc0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9bf5175210 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:memcpy_orig+0x64/0x120 arch/x86/lib/memcpy_64.S:94 Code: 57 10 4c 89 5f 18 48 8d 7f 20 73 d4 83 c2 20 eb 4c 48 01 d6 48 01 d7 48 83 ea 20 66 2e 0f 1f 84 00 00 00 00 00 90 48 83 ea 20 <4c> 8b 46 f8 4c 8b 4e f0 4c 8b 56 e8 4c 8b 5e e0 48 8d 76 e0 4c 89 RSP: 0018:ffffc9000273f5a0 EFLAGS: 00010282 RAX: ffff888064108000 RBX: ffff88807a48eea8 RCX: dffffc0000000000 RDX: 8100000000000070 RSI: 80ff888064f0e198 RDI: 80ff8880641080b0 RBP: ffff888064108000 R08: ffffffff83beadf4 R09: 1ffffd4000320840 R10: dffffc0000000000 R11: fffff94000320841 R12: 1ffffd4000320840 R13: ffffea0001904200 R14: 81000000000000b0 R15: 1ffffd4000320841 FS: 0000000000000000(0000) GS:ffff8880be400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4bf9631fe0 CR3: 00000000186b0000 CR4: 0000000000750ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 ---------------- Code disassembly (best guess): 0: 57 push %rdi 1: 10 4c 89 5f adc %cl,0x5f(%rcx,%rcx,4) 5: 18 48 8d sbb %cl,-0x73(%rax) 8: 7f 20 jg 0x2a a: 73 d4 jae 0xffffffe0 c: 83 c2 20 add $0x20,%edx f: eb 4c jmp 0x5d 11: 48 01 d6 add %rdx,%rsi 14: 48 01 d7 add %rdx,%rdi 17: 48 83 ea 20 sub $0x20,%rdx 1b: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 22: 00 00 00 25: 90 nop 26: 48 83 ea 20 sub $0x20,%rdx * 2a: 4c 8b 46 f8 mov -0x8(%rsi),%r8 <-- trapping instruction 2e: 4c 8b 4e f0 mov -0x10(%rsi),%r9 32: 4c 8b 56 e8 mov -0x18(%rsi),%r10 36: 4c 8b 5e e0 mov -0x20(%rsi),%r11 3a: 48 8d 76 e0 lea -0x20(%rsi),%rsi 3e: 4c rex.WR 3f: 89 .byte 0x89 ``` 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 View attachment "gfs2_unstuffer_folio.c" of type "text/x-csrc" (373235 bytes) Download attachment "config" of type "application/octet-stream" (247919 bytes)
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