================================================================== BUG: KASAN: slab-use-after-free in diIAGRead fs/jfs/jfs_imap.c:2655 [inline] BUG: KASAN: slab-use-after-free in diRead+0x158/0x950 fs/jfs/jfs_imap.c:315 Read of size 8 at addr ffff0001300a0820 by task syz-executor.4/7256 CPU: 0 PID: 7256 Comm: syz-executor.4 Not tainted 6.3.0-rc1-syzkaller-gfe15c26ee26e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:319 [inline] print_report+0x174/0x514 mm/kasan/report.c:430 kasan_report+0xd4/0x130 mm/kasan/report.c:536 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:381 diIAGRead fs/jfs/jfs_imap.c:2655 [inline] diRead+0x158/0x950 fs/jfs/jfs_imap.c:315 jfs_iget+0x88/0x364 fs/jfs/inode.c:35 jfs_lookup+0x1e8/0x39c fs/jfs/namei.c:1462 __lookup_slow+0x250/0x374 fs/namei.c:1686 lookup_slow+0x60/0x84 fs/namei.c:1703 walk_component+0x280/0x36c fs/namei.c:1994 lookup_last fs/namei.c:2451 [inline] path_lookupat+0x13c/0x3d0 fs/namei.c:2475 filename_lookup+0x1d4/0x4e0 fs/namei.c:2504 user_path_at_empty+0x5c/0x1a4 fs/namei.c:2877 user_path_at include/linux/namei.h:57 [inline] do_fchownat+0xec/0x234 fs/open.c:799 __do_sys_fchownat fs/open.c:820 [inline] __se_sys_fchownat fs/open.c:817 [inline] __arm64_sys_fchownat+0xb8/0xd4 fs/open.c:817 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Allocated by task 7259: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:510 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc+0xd8/0x1c4 mm/slab_common.c:980 kmalloc include/linux/slab.h:584 [inline] tomoyo_realpath_from_path+0xc8/0x4cc security/tomoyo/realpath.c:251 tomoyo_mount_acl security/tomoyo/mount.c:141 [inline] tomoyo_mount_permission+0x850/0x938 security/tomoyo/mount.c:237 tomoyo_sb_mount+0x48/0x60 security/tomoyo/tomoyo.c:413 security_sb_mount+0x94/0xd4 security/security.c:1007 path_mount+0xb8/0xe20 fs/namespace.c:3314 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3571 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Freed by task 7259: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:521 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3800 kfree+0x104/0x228 mm/slab_common.c:1019 tomoyo_realpath_from_path+0x484/0x4cc security/tomoyo/realpath.c:286 tomoyo_mount_acl security/tomoyo/mount.c:141 [inline] tomoyo_mount_permission+0x850/0x938 security/tomoyo/mount.c:237 tomoyo_sb_mount+0x48/0x60 security/tomoyo/tomoyo.c:413 security_sb_mount+0x94/0xd4 security/security.c:1007 path_mount+0xb8/0xe20 fs/namespace.c:3314 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3571 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the object at ffff0001300a0000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2080 bytes inside of freed 4096-byte region [ffff0001300a0000, ffff0001300a1000) The buggy address belongs to the physical page: page:00000000302d9763 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1700a0 head:00000000302d9763 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 ffff0000c0002a80 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0001300a0700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0001300a0780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0001300a0800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0001300a0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0001300a0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000005 KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 [dfff800000000005] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 7256 Comm: syz-executor.4 Tainted: G B 6.3.0-rc1-syzkaller-gfe15c26ee26e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : diIAGRead fs/jfs/jfs_imap.c:2659 [inline] pc : diRead+0x164/0x950 fs/jfs/jfs_imap.c:315 lr : diIAGRead fs/jfs/jfs_imap.c:2655 [inline] lr : diRead+0x158/0x950 fs/jfs/jfs_imap.c:315 sp : ffff800022e074d0 x29: ffff800022e07520 x28: ffff0001300a0000 x27: 1ffff000045c0ee2 x26: dfff800000000000 x25: 0000000000000028 x24: 0000000000000000 x23: ffff000132c31c88 x22: dfff800000000000 x21: ffff000132c332b0 x20: ffff000132c31ff0 x19: 0000000000000020 x18: 1fffe000368951b6 x17: ffff800015cdd000 x16: ffff80001246250c x15: 0000000000000000 x14: 0000000040000000 x13: 0000000000000002 x12: 0000000000000001 x11: ff808000081bc408 x10: 0000000000000000 x9 : 0000000000000000 x8 : 0000000000000005 x7 : 1fffe000368951b7 x6 : ffff80000828dc14 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000081bc3c4 x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000001 Call trace: diIAGRead fs/jfs/jfs_imap.c:2659 [inline] diRead+0x164/0x950 fs/jfs/jfs_imap.c:315 jfs_iget+0x88/0x364 fs/jfs/inode.c:35 jfs_lookup+0x1e8/0x39c fs/jfs/namei.c:1462 __lookup_slow+0x250/0x374 fs/namei.c:1686 lookup_slow+0x60/0x84 fs/namei.c:1703 walk_component+0x280/0x36c fs/namei.c:1994 lookup_last fs/namei.c:2451 [inline] path_lookupat+0x13c/0x3d0 fs/namei.c:2475 filename_lookup+0x1d4/0x4e0 fs/namei.c:2504 user_path_at_empty+0x5c/0x1a4 fs/namei.c:2877 user_path_at include/linux/namei.h:57 [inline] do_fchownat+0xec/0x234 fs/open.c:799 __do_sys_fchownat fs/open.c:820 [inline] __se_sys_fchownat fs/open.c:817 [inline] __arm64_sys_fchownat+0xb8/0xd4 fs/open.c:817 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Code: 97beab68 f9400318 9100a319 d343ff28 (38766908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97beab68 bl 0xfffffffffefaada0 4: f9400318 ldr x24, [x24] 8: 9100a319 add x25, x24, #0x28 c: d343ff28 lsr x8, x25, #3 * 10: 38766908 ldrb w8, [x8, x22] <-- trapping instruction