linux-kernel - Re: [syzbot] [ntfs3?] UBSAN: array-index-out-of-bounds in truncate_inode_pages

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Message-ID: <000000000000e4a538060396e4e9@google.com>
Date:   Wed, 23 Aug 2023 06:14:40 -0700
From:   syzbot <syzbot+e295147e14b474e4ad70@...kaller.appspotmail.com>
To:     almaz.alexandrovich@...agon-software.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, nathan@...nel.org, ndesaulniers@...gle.com,
        ntfs3@...ts.linux.dev, syzkaller-bugs@...glegroups.com,
        trix@...hat.com
Subject: Re: [syzbot] [ntfs3?] UBSAN: array-index-out-of-bounds in truncate_inode_pages_final

syzbot has found a reproducer for the following issue on:

HEAD commit:    35e2132122ba Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=16924717a80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4f6a8d3c0bd07f11
dashboard link: https://syzkaller.appspot.com/bug?extid=e295147e14b474e4ad70
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16a2eeb0680000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12224553a80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6808a9c4c8df/disk-35e21321.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/85a6cfc7b474/vmlinux-35e21321.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a3958fe16b1c/Image-35e21321.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/b81535b17c61/mount_1.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e295147e14b474e4ad70@...kaller.appspotmail.com

================================================================================
UBSAN: array-index-out-of-bounds in ./include/linux/pagevec.h:74:2
index 255 is out of range for type 'struct folio *[15]'
CPU: 1 PID: 12841 Comm: syz-executor402 Not tainted 6.5.0-rc7-syzkaller-g35e2132122ba #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233
 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 dump_stack+0x1c/0x28 lib/dump_stack.c:113
 ubsan_epilogue lib/ubsan.c:217 [inline]
 __ubsan_handle_out_of_bounds+0xfc/0x148 lib/ubsan.c:348
 folio_batch_add include/linux/pagevec.h:74 [inline]
 find_lock_entries+0x8fc/0xd84 mm/filemap.c:2089
 truncate_inode_pages_range+0x1b0/0xf74 mm/truncate.c:364
 truncate_inode_pages mm/truncate.c:449 [inline]
 truncate_inode_pages_final+0x90/0xc0 mm/truncate.c:484
 ntfs_evict_inode+0x20/0x48 fs/ntfs3/inode.c:1790
 evict+0x260/0x68c fs/inode.c:664
 iput_final fs/inode.c:1788 [inline]
 iput+0x734/0x818 fs/inode.c:1814
 ntfs_fill_super+0x3648/0x3f90 fs/ntfs3/super.c:1420
 get_tree_bdev+0x378/0x570 fs/super.c:1318
 ntfs_fs_get_tree+0x28/0x38 fs/ntfs3/super.c:1647
 vfs_get_tree+0x90/0x274 fs/super.c:1519
 do_new_mount+0x25c/0x8c8 fs/namespace.c:3335
 path_mount+0x590/0xe04 fs/namespace.c:3662
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount fs/namespace.c:3861 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3861
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x58/0x16c arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
================================================================================


---
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.