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List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:b26:b0:3a0:a385:9128 with SMTP id e9e14a558f8ab-3a0c9cf9163mr25882685ab.6.1726841722075; Fri, 20 Sep 2024 07:15:22 -0700 (PDT) Date: Fri, 20 Sep 2024 07:15:22 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <66ed837a.050a0220.29194.0057.GAE@google.com> Subject: [syzbot] [lsm?] KASAN: slab-use-after-free Read in smk_access From: syzbot To: casey@schaufler-ca.com, jmorris@namei.org, john.johansen@canonical.com, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, paul@paul-moore.com, serge@hallyn.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: a430d95c5efa Merge tag 'lsm-pr-20240911' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10469d00580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d9ab5893ec5191eb dashboard link: https://syzkaller.appspot.com/bug?extid=a95cf48b5daf4bb16c29 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=110e6a77980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10cee207980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c27c9d8c6782/disk-a430d95c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/73c62c975a0c/vmlinux-a430d95c.xz kernel image: https://storage.googleapis.com/syzbot-assets/56164e51e333/bzImage-a430d95c.xz The issue was bisected to: commit 5f8d28f6d7d568dbbc8c5bce94894474c07afd4f Author: Casey Schaufler Date: Wed Jul 10 21:32:26 2024 +0000 lsm: infrastructure management of the key security blob bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10293fc7980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=12293fc7980000 console output: https://syzkaller.appspot.com/x/log.txt?x=14293fc7980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a95cf48b5daf4bb16c29@syzkaller.appspotmail.com Fixes: 5f8d28f6d7d5 ("lsm: infrastructure management of the key security blob") ================================================================== BUG: KASAN: slab-out-of-bounds in smk_access+0xae/0x4e0 security/smack/smack_access.c:147 Read of size 8 at addr ffff8880202b03c0 by task syz-executor367/5216 CPU: 0 UID: 60928 PID: 5216 Comm: syz-executor367 Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 smk_access+0xae/0x4e0 security/smack/smack_access.c:147 smack_watch_key+0x2f4/0x3a0 security/smack/smack_lsm.c:4656 security_watch_key+0x86/0x250 security/security.c:4448 keyctl_watch_key+0x2b7/0x480 security/keys/keyctl.c:1813 __do_sys_keyctl security/keys/keyctl.c:2021 [inline] __se_sys_keyctl+0x106/0xa50 security/keys/keyctl.c:1874 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbebbbc2fe9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 1d 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbebbb74238 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa RAX: ffffffffffffffda RBX: 00007fbebbc463e8 RCX: 00007fbebbbc2fe9 RDX: 0000000000000004 RSI: 0000000016bf1cf5 RDI: 0000000000000020 RBP: 00007fbebbc463e0 R08: 0000000000000000 R09: 00007fbebbb746c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00676e697279656b R13: 0000000000000002 R14: 00007ffe798160c0 R15: 00007ffe798161a8 Allocated by task 5216: 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:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4159 [inline] __kmalloc_node_track_caller_noprof+0x225/0x440 mm/slub.c:4178 kmemdup_noprof+0x2a/0x60 mm/util.c:133 key_alloc+0x388/0xff0 security/keys/key.c:282 __key_create_or_update+0xa55/0xc70 security/keys/key.c:930 key_create_or_update+0x42/0x60 security/keys/key.c:1018 __do_sys_add_key security/keys/keyctl.c:134 [inline] __se_sys_add_key+0x33f/0x490 security/keys/keyctl.c:74 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880202b03c0 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes inside of allocated 5-byte region [ffff8880202b03c0, ffff8880202b03c5) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x202b0 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff88801a841500 ffffea0000bba600 dead000000000002 raw: 0000000000000000 0000000080800080 00000001fdffffff 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 3183568899, free_ts 3069912852 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500 prep_new_page mm/page_alloc.c:1508 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2319 allocate_slab+0x5a/0x2f0 mm/slub.c:2482 new_slab mm/slub.c:2535 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3721 __slab_alloc+0x58/0xa0 mm/slub.c:3811 __slab_alloc_node mm/slub.c:3864 [inline] slab_alloc_node mm/slub.c:4026 [inline] __do_kmalloc_node mm/slub.c:4158 [inline] __kmalloc_noprof+0x25a/0x400 mm/slub.c:4171 kmalloc_noprof include/linux/slab.h:694 [inline] kzalloc_noprof include/linux/slab.h:816 [inline] acpi_ns_internalize_name+0x419/0x610 drivers/acpi/acpica/nsutils.c:331 acpi_ns_get_node_unlocked drivers/acpi/acpica/nsutils.c:666 [inline] acpi_ns_get_node+0x1b7/0x3c0 drivers/acpi/acpica/nsutils.c:726 acpi_get_handle+0x19b/0x2a0 drivers/acpi/acpica/nsxfname.c:98 acpi_has_method+0x9e/0xf0 drivers/acpi/utils.c:673 acpi_bus_get_wakeup_device_flags drivers/acpi/scan.c:1036 [inline] acpi_add_single_object+0xe5e/0x1e00 drivers/acpi/scan.c:1902 acpi_bus_check_add+0x32b/0x980 drivers/acpi/scan.c:2181 acpi_ns_walk_namespace+0x294/0x4f0 acpi_walk_namespace+0xeb/0x130 drivers/acpi/acpica/nsxfeval.c:606 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1101 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2619 discard_slab mm/slub.c:2581 [inline] __put_partials+0xeb/0x130 mm/slub.c:3049 put_cpu_partial+0x17c/0x250 mm/slub.c:3124 __slab_free+0x2ea/0x3d0 mm/slub.c:4344 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_remove_cache+0x15d/0x180 mm/kasan/quarantine.c:378 kmem_cache_shrink+0xd/0x20 mm/slab_common.c:666 acpi_os_purge_cache+0x15/0x20 drivers/acpi/osl.c:1573 acpi_purge_cached_objects+0x8f/0xc0 drivers/acpi/acpica/utxface.c:239 acpi_initialize_objects+0x2e/0xa0 drivers/acpi/acpica/utxfinit.c:250 acpi_bus_init+0xda/0xbc0 drivers/acpi/bus.c:1367 acpi_init+0xb4/0x240 drivers/acpi/bus.c:1452 do_one_initcall+0x248/0x880 init/main.c:1269 do_initcall_level+0x157/0x210 init/main.c:1331 do_initcalls+0x3f/0x80 init/main.c:1347 kernel_init_freeable+0x435/0x5d0 init/main.c:1580 Memory state around the buggy address: ffff8880202b0280: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ffff8880202b0300: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc >ffff8880202b0380: fa fc fc fc 00 fc fc fc 05 fc fc fc 00 fc fc fc ^ ffff8880202b0400: 05 fc fc fc fa fc fc fc fa fc fc fc 00 fc fc fc ffff8880202b0480: 00 fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup