================================================================== BUG: KASAN: slab-out-of-bounds in key_task_permission+0x3eb/0x4f0 security/keys/permission.c:54 Read of size 4 at addr ffff88801e9cc5e0 by task syz-executor.0/3778 CPU: 1 PID: 3778 Comm: syz-executor.0 Not tainted 6.8.0-rc4-syzkaller-00388-gced590523156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 mm/kasan/report.c:601 key_task_permission+0x3eb/0x4f0 security/keys/permission.c:54 search_nested_keyrings+0x94d/0x1190 security/keys/keyring.c:793 keyring_search_rcu+0x198/0x290 security/keys/keyring.c:922 search_cred_keyrings_rcu+0x4a1/0x600 security/keys/process_keys.c:501 search_process_keyrings_rcu+0x1e/0x2b0 security/keys/process_keys.c:544 request_key_and_link+0x5a6/0x19c0 security/keys/request_key.c:618 __do_sys_request_key security/keys/keyctl.c:222 [inline] __se_sys_request_key+0x271/0x3b0 security/keys/keyctl.c:167 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xbd/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 RIP: 0023:0xf72d9579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5ed35ac EFLAGS: 00000206 ORIG_RAX: 000000000000011f RAX: ffffffffffffffda RBX: 0000000020000100 RCX: 0000000020000240 RDX: 0000000020000300 RSI: 00000000fffffffc RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 3659: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc+0x22e/0x490 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] kzalloc include/linux/slab.h:711 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x59e/0x5e0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x255/0x500 security/tomoyo/file.c:771 security_file_open+0x69/0x570 security/security.c:2933 do_dentry_open+0x327/0x15a0 fs/open.c:940 do_open fs/namei.c:3641 [inline] path_openat+0x285f/0x3240 fs/namei.c:3798 do_filp_open+0x234/0x490 fs/namei.c:3825 do_sys_openat2+0x13e/0x1d0 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_compat_sys_openat fs/open.c:1479 [inline] __se_compat_sys_openat fs/open.c:1477 [inline] __ia32_compat_sys_openat+0x23f/0x290 fs/open.c:1477 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xbd/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 Freed by task 3659: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:640 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:241 __kasan_slab_free+0x34/0x70 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x14a/0x380 mm/slub.c:4409 tomoyo_check_open_permission+0x376/0x500 security/tomoyo/file.c:786 security_file_open+0x69/0x570 security/security.c:2933 do_dentry_open+0x327/0x15a0 fs/open.c:940 do_open fs/namei.c:3641 [inline] path_openat+0x285f/0x3240 fs/namei.c:3798 do_filp_open+0x234/0x490 fs/namei.c:3825 do_sys_openat2+0x13e/0x1d0 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_compat_sys_openat fs/open.c:1479 [inline] __se_compat_sys_openat fs/open.c:1477 [inline] __ia32_compat_sys_openat+0x23f/0x290 fs/open.c:1477 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xbd/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 The buggy address belongs to the object at ffff88801e9cc580 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 64 bytes to the right of allocated 32-byte region [ffff88801e9cc580, ffff88801e9cc5a0) The buggy address belongs to the physical page: page:ffffea00007a7300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e9cc anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888014c41500 ffffea0001e6a540 dead000000000005 raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5090, tgid 5090 (syz-executor.4), ts 103426494498, free_ts 103421611023 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc+0x2e0/0x490 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] kzalloc include/linux/slab.h:711 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x59e/0x5e0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x23a/0x880 security/tomoyo/file.c:723 security_file_ioctl_compat+0x75/0xb0 security/security.c:2744 __do_compat_sys_ioctl fs/ioctl.c:923 [inline] __se_compat_sys_ioctl+0xd6/0xbf0 fs/ioctl.c:914 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xbd/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 page last free pid 6815 tgid 6813 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 tlb_batch_list_free mm/mmu_gather.c:114 [inline] tlb_finish_mmu+0x11f/0x200 mm/mmu_gather.c:395 exit_mmap+0x4b6/0xd40 mm/mmap.c:3292 __mmput+0x115/0x3c0 kernel/fork.c:1343 exit_mm+0x21f/0x310 kernel/exit.c:569 do_exit+0x9af/0x2740 kernel/exit.c:858 do_group_exit+0x206/0x2c0 kernel/exit.c:1020 get_signal+0x176d/0x1850 kernel/signal.c:2893 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc8/0x370 kernel/entry/common.c:212 __do_fast_syscall_32+0xcf/0x120 arch/x86/entry/common.c:324 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7c/0x86 Memory state around the buggy address: ffff88801e9cc480: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff88801e9cc500: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801e9cc580: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88801e9cc600: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff88801e9cc680: fa fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop