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[syzbot reported] ================================================================== BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:587 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock+0xfe/0xd70 kernel/locking/mutex.c:752 Read of size 8 at addr ffff8880229254b0 by task syz-executor357/5216 CPU: 0 UID: 0 PID: 5216 Comm: syz-executor357 Not tainted 6.11.0-rc3-syzkaller-00156-gd7a5aa4b3c00 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: <TASK> __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 __mutex_lock_common kernel/locking/mutex.c:587 [inline] __mutex_lock+0xfe/0xd70 kernel/locking/mutex.c:752 dbFreeBits+0x7ea/0xd90 fs/jfs/jfs_dmap.c:2390 dbFreeDmap fs/jfs/jfs_dmap.c:2089 [inline] dbFree+0x35b/0x680 fs/jfs/jfs_dmap.c:409 dbDiscardAG+0x8a9/0xa20 fs/jfs/jfs_dmap.c:1650 jfs_ioc_trim+0x433/0x670 fs/jfs/jfs_discard.c:100 jfs_ioctl+0x2d0/0x3e0 fs/jfs/ioctl.c:131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 Freed by task 5218: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x149/0x360 mm/slub.c:4594 dbUnmount+0x11d/0x190 fs/jfs/jfs_dmap.c:278 jfs_mount_rw+0x4ac/0x6a0 fs/jfs/jfs_mount.c:247 jfs_remount+0x3d1/0x6b0 fs/jfs/super.c:454 reconfigure_super+0x445/0x880 fs/super.c:1083 vfs_cmd_reconfigure fs/fsopen.c:263 [inline] vfs_fsconfig_locked fs/fsopen.c:292 [inline] __do_sys_fsconfig fs/fsopen.c:473 [inline] __se_sys_fsconfig+0xb6e/0xf80 fs/fsopen.c:345 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 [Analysis] There are two paths (dbUnmount and jfs_ioc_trim) that generate race condition when accessing bmap, which leads to the occurrence of uaf. Use the lock s_umount to synchronize them, in order to avoid uaf caused by race condition. Reported-and-tested-by: syzbot+3c010e21296f33a5dc16@syzkaller.appspotmail.com Signed-off-by: Edward Adam Davis <eadavis@qq.com> Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) Tino Reichardt, 2012
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*/
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include "jfs_incore.h"
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#include "jfs_superblock.h"
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#include "jfs_discard.h"
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#include "jfs_dmap.h"
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#include "jfs_debug.h"
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/*
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* NAME: jfs_issue_discard()
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*
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* FUNCTION: TRIM the specified block range on device, if supported
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*
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* PARAMETERS:
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* ip - pointer to in-core inode
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* blkno - starting block number to be trimmed (0..N)
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* nblocks - number of blocks to be trimmed
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*
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* RETURN VALUES:
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* none
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*
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* serialization: IREAD_LOCK(ipbmap) held on entry/exit;
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*/
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void jfs_issue_discard(struct inode *ip, u64 blkno, u64 nblocks)
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{
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struct super_block *sb = ip->i_sb;
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int r = 0;
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r = sb_issue_discard(sb, blkno, nblocks, GFP_NOFS, 0);
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if (unlikely(r != 0)) {
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jfs_err("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d => failed!",
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sb, (unsigned long long)blkno,
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(unsigned long long)nblocks, r);
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}
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jfs_info("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d",
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sb, (unsigned long long)blkno,
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(unsigned long long)nblocks, r);
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return;
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}
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/*
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* NAME: jfs_ioc_trim()
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*
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* FUNCTION: attempt to discard (TRIM) all free blocks from the
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* filesystem.
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*
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* PARAMETERS:
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* ip - pointer to in-core inode;
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* range - the range, given by user space
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*
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* RETURN VALUES:
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* 0 - success
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* -EIO - i/o error
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*/
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int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range)
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{
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struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
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struct bmap *bmp;
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struct super_block *sb = ipbmap->i_sb;
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int agno, agno_end;
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u64 start, end, minlen;
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u64 trimmed = 0;
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/**
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* convert byte values to block size of filesystem:
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* start: First Byte to trim
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* len: number of Bytes to trim from start
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* minlen: minimum extent length in Bytes
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*/
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start = range->start >> sb->s_blocksize_bits;
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end = start + (range->len >> sb->s_blocksize_bits) - 1;
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minlen = range->minlen >> sb->s_blocksize_bits;
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if (minlen == 0)
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minlen = 1;
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down_read(&sb->s_umount);
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bmp = JFS_SBI(ip->i_sb)->bmap;
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if (minlen > bmp->db_agsize ||
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start >= bmp->db_mapsize ||
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range->len < sb->s_blocksize) {
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up_read(&sb->s_umount);
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return -EINVAL;
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}
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if (end >= bmp->db_mapsize)
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end = bmp->db_mapsize - 1;
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/**
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* we trim all ag's within the range
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*/
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agno = BLKTOAG(start, JFS_SBI(ip->i_sb));
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agno_end = BLKTOAG(end, JFS_SBI(ip->i_sb));
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while (agno <= agno_end) {
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trimmed += dbDiscardAG(ip, agno, minlen);
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agno++;
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}
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up_read(&sb->s_umount);
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range->len = trimmed << sb->s_blocksize_bits;
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return 0;
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}
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