EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. usercopy: Kernel memory exposure attempt detected from SLUB object 'ext4_inode_cache' (offset 0, size 176)! ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:102! Oops: invalid opcode: 0000 [#1] PREEMPT SMP PTI CPU: 0 UID: 0 PID: 3531 Comm: syz.3.16 Not tainted 6.13.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:usercopy_abort+0x84/0x90 mm/usercopy.c:102 Code: 49 89 ce 48 c7 c3 f7 bb 12 83 48 0f 44 de 48 c7 c7 90 bb 12 83 4c 89 de 48 89 c1 41 52 41 56 53 e8 01 ec c8 ff 48 83 c4 18 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900023a3de0 EFLAGS: 00010292 RAX: 000000000000006b RBX: ffffffff8312bbf7 RCX: 64d8bfc30c3c9c00 RDX: ffff888237c291e0 RSI: ffffffff83155754 RDI: 00000000ffffffff RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8352bce0 R10: ffffc900023a3cb0 R11: ffffc900023a3c58 R12: 0000000020000240 R13: 0000000000000001 R14: 0000000000000000 R15: 00000000000000b0 FS: 00007fc1b6cab6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e65ffff CR3: 00000001027ce000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __check_heap_object+0xb1/0x100 mm/slub.c:5807 check_heap_object mm/usercopy.c:196 [inline] __check_object_size+0xe6/0x370 mm/usercopy.c:251 check_object_size include/linux/thread_info.h:228 [inline] check_copy_size include/linux/thread_info.h:264 [inline] copy_to_user include/linux/uaccess.h:219 [inline] readlink_copy fs/namei.c:5282 [inline] vfs_readlink+0x113/0x200 fs/namei.c:5305 do_readlinkat+0xc2/0x150 fs/stat.c:576 __do_sys_readlinkat fs/stat.c:593 [inline] __se_sys_readlinkat fs/stat.c:590 [inline] __x64_sys_readlinkat+0x19/0x20 fs/stat.c:590 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xe0/0x1f0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc1b5d8cda9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc1b6cab038 EFLAGS: 00000246 ORIG_RAX: 000000000000010b RAX: ffffffffffffffda RBX: 00007fc1b5fa5fa0 RCX: 00007fc1b5d8cda9 RDX: 00000000200002c0 RSI: 0000000020000240 RDI: ffffffffffffff9c RBP: 00007fc1b5e0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000b0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc1b5fa5fa0 R15: 00007fffd6e64198 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:usercopy_abort+0x84/0x90 mm/usercopy.c:102 Code: 49 89 ce 48 c7 c3 f7 bb 12 83 48 0f 44 de 48 c7 c7 90 bb 12 83 4c 89 de 48 89 c1 41 52 41 56 53 e8 01 ec c8 ff 48 83 c4 18 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900023a3de0 EFLAGS: 00010292 RAX: 000000000000006b RBX: ffffffff8312bbf7 RCX: 64d8bfc30c3c9c00 RDX: ffff888237c291e0 RSI: ffffffff83155754 RDI: 00000000ffffffff RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8352bce0 R10: ffffc900023a3cb0 R11: ffffc900023a3c58 R12: 0000000020000240 R13: 0000000000000001 R14: 0000000000000000 R15: 00000000000000b0 FS: 00007fc1b6cab6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e65ffff CR3: 00000001027ce000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400