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h26-20020a5d971a000000b006d52f6e0834mr16781691iol.181.1669369541601; Fri, 25 Nov 2022 01:45:41 -0800 (PST) Date: Fri, 25 Nov 2022 01:45:41 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000086b19705ee486240@google.com> Subject: [syzbot] KASAN: slab-out-of-bounds Write in hfs_asc2mac From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 4312098baf37 Merge tag 'spi-fix-v6.1-rc6' of git://git.ker.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=11fd0a73880000 kernel config: https://syzkaller.appspot.com/x/.config?x=8d01b6e3197974dd dashboard link: https://syzkaller.appspot.com/bug?extid=dc3b1cf9111ab5fe98e7 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13e49a3d880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11a15a73880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4b7073d20a37/disk-4312098b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/36a0367a5593/vmlinux-4312098b.xz kernel image: https://storage.googleapis.com/syzbot-assets/265bedb3086b/bzImage-4312098b.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/cf5f83add496/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dc3b1cf9111ab5fe98e7@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 64 ================================================================== BUG: KASAN: slab-out-of-bounds in hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133 Write of size 1 at addr ffff88801848314e by task syz-executor391/3632 CPU: 0 PID: 3632 Comm: syz-executor391 Not tainted 6.1.0-rc6-syzkaller-00012-g4312098baf37 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x1f0 mm/kasan/report.c:395 kasan_report+0xcd/0x100 mm/kasan/report.c:495 hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133 hfs_cat_build_key+0x92/0x170 fs/hfs/catalog.c:28 hfs_lookup+0x1ab/0x2c0 fs/hfs/dir.c:31 lookup_open fs/namei.c:3391 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x10e6/0x2df0 fs/namei.c:3710 do_filp_open+0x264/0x4f0 fs/namei.c:3740 do_sys_openat2+0x124/0x4e0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_open fs/open.c:1334 [inline] __se_sys_open fs/open.c:1330 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1330 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fdc79c9d839 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd57f47648 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdc79c9d839 RDX: 0000000000000100 RSI: 0000000000002000 RDI: 0000000020000800 RBP: 00007fdc79c5d0d0 R08: 0000000000000245 R09: 0000000000000000 R10: 00007ffd57f47510 R11: 0000000000000246 R12: 00007fdc79c5d160 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 3632: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0xaf/0x1a0 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] hfs_find_init+0x8b/0x1e0 fs/hfs/bfind.c:21 hfs_lookup+0x105/0x2c0 fs/hfs/dir.c:28 lookup_open fs/namei.c:3391 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x10e6/0x2df0 fs/namei.c:3710 do_filp_open+0x264/0x4f0 fs/namei.c:3740 do_sys_openat2+0x124/0x4e0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_open fs/open.c:1334 [inline] __se_sys_open fs/open.c:1330 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1330 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888018483100 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 78 bytes inside of 96-byte region [ffff888018483100, ffff888018483160) The buggy address belongs to the physical page: page:ffffea00006120c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x18483 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff888012841780 raw: 0000000000000000 0000000080200020 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 2311131230, free_ts 0 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4288 __alloc_pages+0x259/0x560 mm/page_alloc.c:5555 alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2118 alloc_slab_page+0x70/0xf0 mm/slub.c:1794 allocate_slab+0x5e/0x4b0 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0x782/0xe20 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x252/0x310 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x9c/0x190 mm/slab_common.c:975 __do_krealloc mm/slab_common.c:1348 [inline] krealloc+0x61/0xf0 mm/slab_common.c:1381 add_sysfs_param+0x134/0x800 kernel/params.c:660 kernel_add_sysfs_param+0xb0/0x126 kernel/params.c:812 param_sysfs_builtin+0x1fb/0x2a5 kernel/params.c:851 param_sysfs_init+0x68/0x6c kernel/params.c:970 do_one_initcall+0x1c9/0x400 init/main.c:1303 do_initcall_level+0x168/0x218 init/main.c:1376 do_initcalls+0x4b/0x8c init/main.c:1392 page_owner free stack trace missing Memory state around the buggy address: ffff888018483000: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888018483080: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff888018483100: 00 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc ^ ffff888018483180: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff888018483200: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc 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