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Vasiliy Kovalev 4abe046c4f jfs: validate AG parameters in dbMount() to prevent crashes 
[ Upstream commit 37bfb464ddca87f203071b5bd562cd91ddc0b40a ]

Validate db_agheight, db_agwidth, and db_agstart in dbMount to catch
corrupted metadata early and avoid undefined behavior in dbAllocAG.
Limits are derived from L2LPERCTL, LPERCTL/MAXAG, and CTLTREESIZE:

- agheight: 0 to L2LPERCTL/2 (0 to 5) ensures shift
  (L2LPERCTL - 2*agheight) >= 0.
- agwidth: 1 to min(LPERCTL/MAXAG, 2^(L2LPERCTL - 2*agheight))
  ensures agperlev >= 1.
  - Ranges: 1-8 (agheight 0-3), 1-4 (agheight 4), 1 (agheight 5).
  - LPERCTL/MAXAG = 1024/128 = 8 limits leaves per AG;
    2^(10 - 2*agheight) prevents division to 0.
- agstart: 0 to CTLTREESIZE-1 - agwidth*(MAXAG-1) keeps ti within
  stree (size 1365).
  - Ranges: 0-1237 (agwidth 1), 0-348 (agwidth 8).

UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1400:9
shift exponent -335544310 is negative
CPU: 0 UID: 0 PID: 5822 Comm: syz-executor130 Not tainted 6.14.0-rc5-syzkaller #0
Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468
 dbAllocAG+0x1087/0x10b0 fs/jfs/jfs_dmap.c:1400
 dbDiscardAG+0x352/0xa20 fs/jfs/jfs_dmap.c:1613
 jfs_ioc_trim+0x45a/0x6b0 fs/jfs/jfs_discard.c:105
 jfs_ioctl+0x2cd/0x3e0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892
 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

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Cc: stable@vger.kernel.org
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: syzbot+fe8264911355151c487f@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=fe8264911355151c487f
Signed-off-by: Vasiliy Kovalev <kovalev@altlinux.org>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 0c40fa81f850556e9aa0185fede9ef1112db7b39)
 		2025-07-09 09:49:57 +08:00
..
Kconfig 22 smb3/cifs client fixes and two related changes (for unicode mapping) 2023-08-30 21:01:40 -07:00
Makefile fs/jfs: Use common ucs2 upper case table 2023-08-30 08:55:52 -05:00
acl.c jfs: convert to ctime accessor functions 2023-07-24 10:30:01 +02:00
file.c splice: Use filemap_splice_read() instead of generic_file_splice_read() 2023-05-24 08:42:17 -06:00
inode.c jfs: convert to ctime accessor functions 2023-07-24 10:30:01 +02:00
ioctl.c jfs: convert to ctime accessor functions 2023-07-24 10:30:01 +02:00
jfs_acl.h fs: port ->set_acl() to pass mnt_idmap 2023-01-19 09:24:27 +01:00
jfs_btree.h
…
jfs_debug.c
…
jfs_debug.h
…
jfs_dinode.h jfs: define xtree root and page independently 2024-12-10 20:40:52 +08:00
jfs_discard.c jfs: Fix uaf in dbFreeBits 2024-12-10 20:42:24 +08:00
jfs_discard.h
…
jfs_dmap.c jfs: validate AG parameters in dbMount() to prevent crashes 2025-07-09 09:49:57 +08:00
jfs_dmap.h
…
jfs_dtree.c jfs: add index corruption check to DT_GETPAGE() 2025-04-14 15:51:34 +08:00
jfs_dtree.h
…
jfs_extent.c jfs: validate max amount of blocks before allocation. 2023-08-29 12:25:47 -05:00
jfs_extent.h jfs: remove unused declarations for jfs 2022-10-18 08:50:26 -05:00
jfs_filsys.h jfs: jfs_dmap: Validate db_l2nbperpage while mounting 2023-06-20 12:37:50 -05:00
jfs_imap.c jfs: Prevent copying of nlink with value 0 from disk inode 2025-05-09 18:47:19 +08:00
jfs_imap.h
…
jfs_incore.h jfs: define xtree root and page independently 2024-12-10 20:40:52 +08:00
jfs_inode.c jfs: convert to ctime accessor functions 2023-07-24 10:30:01 +02:00
jfs_inode.h fs: port ->fileattr_set() to pass mnt_idmap 2023-01-19 09:24:27 +01:00
jfs_lock.h
…
jfs_logmgr.c jfs: fix log->bdev_handle null ptr deref in lbmStartIO 2024-12-10 20:40:34 +08:00
jfs_logmgr.h jfs: Convert to bdev_open_by_dev() 2024-12-10 20:40:34 +08:00
jfs_metapage.c mm,jfs: move write_one_page/folio_write_one to jfs 2023-03-12 20:00:42 -04:00
jfs_metapage.h
…
jfs_mount.c jfs: Convert to bdev_open_by_dev() 2024-12-10 20:40:34 +08:00
jfs_superblock.h
…
jfs_txnmgr.c jfs: define xtree root and page independently 2024-12-10 20:40:52 +08:00
jfs_txnmgr.h
…
jfs_types.h
…
jfs_umount.c jfs: Fix a typo in function jfs_umount 2022-11-10 15:08:00 -06:00
jfs_unicode.c
…
jfs_unicode.h fs/jfs: Use common ucs2 upper case table 2023-08-30 08:55:52 -05:00
jfs_xattr.h fs/jfs/jfs_xattr.h: Fix spelling typo in comment 2022-10-18 08:50:26 -05:00
jfs_xtree.c jfs: define xtree root and page independently 2024-12-10 20:40:52 +08:00
jfs_xtree.h jfs: define xtree root and page independently 2024-12-10 20:40:52 +08:00
namei.c A few small fixes 2023-08-31 15:25:01 -07:00
resize.c
…
super.c quota: Properly annotate i_dquot arrays with __rcu 2024-03-26 18:19:46 -04:00
symlink.c
…
xattr.c jfs: fix slab-out-of-bounds read in ea_get() 2025-04-14 15:51:34 +08:00