Message-ID: <CAEK-7J+fkLceCTCqGoz_tNcN85iDVsMjeecfBZ-Eq9ZE5qVj3A@mail.gmail.com>
Date:   Sun, 17 Jul 2022 15:24:33 -0700
From:   Dipanjan Das <mail.dipanjan.das@...il.com>
To:     willy@...radead.org, jlayton@...nel.org, neilb@...e.de,
        damien.lemoal@...nsource.wdc.com, jack@...e.cz,
        reiserfs-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     syzkaller@...glegroups.com
Subject: KASAN: vmalloc-out-of-bounds Read in cleanup_bitmap_list

Hi,

We would like to report the following bug which has been found by our
modified version of syzkaller.

======================================================
description: KASAN: vmalloc-out-of-bounds Read in cleanup_bitmap_list
affected file: fs/reiserfs/journal.c
kernel version: 5.19-rc6
kernel commit: 32346491ddf24599decca06190ebca03ff9de7f8
git tree: upstream
kernel config: attached
crash reproducer: none
======================================================
Crash log:

BUG: KASAN: vmalloc-out-of-bounds in
cleanup_bitmap_list.isra.0.part.0+0x4a0/0x5e0
fs/reiserfs/journal.c:231
Read of size 8 at addr ffffc900136dd008 by task syz-executor.2/13172

CPU: 0 PID: 13172 Comm: syz-executor.2 Tainted: G           OE
5.19.0-rc6-g2eae0556bb9d #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:313 [inline]
 print_report.cold+0x176/0x659 mm/kasan/report.c:429
 kasan_report+0x8a/0x1b0 mm/kasan/report.c:491
 cleanup_bitmap_list.isra.0.part.0+0x4a0/0x5e0 fs/reiserfs/journal.c:231
 cleanup_bitmap_list fs/reiserfs/journal.c:227 [inline]
 free_list_bitmaps+0x68/0x100 fs/reiserfs/journal.c:249
 free_journal_ram+0xfc/0x500 fs/reiserfs/journal.c:1887
 do_journal_release fs/reiserfs/journal.c:1960 [inline]
 journal_release_error+0x72/0x90 fs/reiserfs/journal.c:1978
 reiserfs_fill_super+0x114d/0x2f10 fs/reiserfs/super.c:2225
 mount_bdev+0x34d/0x410 fs/super.c:1367
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1497
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1228/0x1cb0 fs/namespace.c:3370
 do_mount+0xf3/0x110 fs/namespace.c:3383
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x18f/0x230 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f121408fe8e
Code: 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f121266a9f8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f121408fe8e
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f121266aa50
RBP: 00007f121266aa90 R08: 00007f121266aa90 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f121266aa50 R15: 0000000020000040
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc900136dd000, ffffc900136df000) created by:
 reiserfs_allocate_list_bitmaps+0x54/0x100 fs/reiserfs/journal.c:290

The buggy address belongs to the physical page:
page:ffffea00054c2700 refcount:1 mapcount:0 mapping:0000000000000000
index:0x0 pfn:0x15309c
flags: 0x17ff00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 017ff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 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
0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 13172,
tgid 13167 (syz-executor.2), ts 141798727963, free_ts 133661424124
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2449 [inline]
 prep_new_page+0x297/0x330 mm/page_alloc.c:2456
 get_page_from_freelist+0x2142/0x3c80 mm/page_alloc.c:4198
 __alloc_pages+0x321/0x710 mm/page_alloc.c:5426
 __alloc_pages_bulk+0x974/0x1590 mm/page_alloc.c:5374
 alloc_pages_bulk_array_mempolicy+0x12d/0x430 mm/mempolicy.c:2367
 vm_area_alloc_pages mm/vmalloc.c:2899 [inline]
 __vmalloc_area_node mm/vmalloc.c:2995 [inline]
 __vmalloc_node_range+0x52f/0x1360 mm/vmalloc.c:3165
 __vmalloc_node mm/vmalloc.c:3230 [inline]
 vzalloc+0x67/0x80 mm/vmalloc.c:3303
 reiserfs_allocate_list_bitmaps+0x54/0x100 fs/reiserfs/journal.c:290
 journal_init+0x3ca/0x64d0 fs/reiserfs/journal.c:2732
 reiserfs_fill_super+0xbbb/0x2f10 fs/reiserfs/super.c:2024
 mount_bdev+0x34d/0x410 fs/super.c:1367
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1497
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1228/0x1cb0 fs/namespace.c:3370
 do_mount+0xf3/0x110 fs/namespace.c:3383
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x18f/0x230 fs/namespace.c:3568
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1371 [inline]
 free_pcp_prepare+0x51f/0xd00 mm/page_alloc.c:1421
 free_unref_page_prepare mm/page_alloc.c:3343 [inline]
 free_unref_page+0x19/0x5b0 mm/page_alloc.c:3438
 kasan_depopulate_vmalloc_pte+0x5c/0x70 mm/kasan/shadow.c:359
 apply_to_pte_range mm/memory.c:2625 [inline]
 apply_to_pmd_range mm/memory.c:2669 [inline]
 apply_to_pud_range mm/memory.c:2705 [inline]
 apply_to_p4d_range mm/memory.c:2741 [inline]
 __apply_to_page_range+0x66e/0xf50 mm/memory.c:2775
 kasan_release_vmalloc+0xa2/0xb0 mm/kasan/shadow.c:469
 __purge_vmap_area_lazy+0x8fe/0x1c90 mm/vmalloc.c:1722
 drain_vmap_area_work+0x52/0xe0 mm/vmalloc.c:1751
 process_one_work+0x9cc/0x1650 kernel/workqueue.c:2289
 worker_thread+0x623/0x1070 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302

Memory state around the buggy address:
 ffffc900136dcf00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900136dcf80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
>ffffc900136dd000: 00 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                      ^
 ffffc900136dd080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc900136dd100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================

-- 
Thanks & Regards,

Dipanjan

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